Features. Applications

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1 MIC2XX Family Fixed and Adjustable Current Limiting Power Distribution Switches General Description MIC2XX family of switches are current limiting, high-side power switches, designed for general purpose power distribution and control in digital televisions (DTV), printers, set top boxes (STB), PCs, PDAs, and other peripheral devices (see Functionality Table and Pin Configuration drawings) MIC2XX family s primary functions are current limiting and power switching. They are thermally protected and will shutdown should their internal temperature reach unsafe levels, protecting both the device and the load, under highcurrent or fault conditions Features include fault reporting, fault blanking to eliminate noise-induced false alarms, output slew rate limiting, under voltage detection, automatic-on output, and enable pin with choice of either active low or active high enable. The FET is self-contained, with a fixed- or user-adjustable current limit. The MIC2XX family is ideal for any system where current limiting and power control are desired. The MIC21X (3 x 9) and MIC219A switches offer a unique new patented feature: Kickstart, which allows momentary high-current surges up to the secondary current limit (I LIMIT _2nd) without sacrificing overall system safety. The MIC2xx family is offered, depending on the desired features, in a space-saving 5-pin SOT-23, 6-pin SOT-23, and 2mm x 2mm MLF packages. Datasheets and support documentation can be found on Micrel s web site at: Features MIC2X3 MIC2X9 7mΩ typical 5V MIC25A/2X9A 17mΩ typical 5V Enable active high or active low 2.5V 5.5V operating range Pre-set current limit values of.5a,.8a, and 1.2A* Adjustable current limit.2a to 2.A* (MIC2X7- MIC2X9) Adjustable current limit.1a to.9a* (MIC2X9A) Undervoltage lock-out (UVLO) Variable UVLO allows adjustable UVLO thresholds* Automatic load discharge for capacitive loads* Soft-start prevents large current inrush Adjustable slew rate allows custom slew rates* Automatic-on output after fault Thermal protection * Available on some family members Applications Digital televisions (DTV) Set top boxes PDAs Printers USB / IEEE 1394 power distribution Desktop and laptop PCs Game consoles Docking stations Typical Application 5V Supply Logic Controller VIN ON/OFF OVERCURRENT/ 1µF MIC25A VIN VOUT GND EN FAULT/ 12µF V BUS USB Port Figure 1. Typical Application Circuit Kickstart is a trademark of Micrel, Inc. MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Protected by U.S. Patent No. 7,17,732 CableCARD is a trademark of CableLabs. Micrel Inc. 218 Fortune Drive San Jose, CA USA tel +1 (48) fax + 1 (48) August 211 M D

2 Ordering Information MIC23/213 Part Number (1) Marking (2) Current Limit Kickstart Package MIC23-.5YM5 FD5.5A MIC23-.8YM5 FD8.8A MIC23-1.2YM5 FD12 1.2A MIC23-.5YML D 5.5A MIC23-.8YML D 8.8A MIC23-1.2YML D A MIC213-.5YM5 FL5.5A MIC213-.8YM5 FL8.8A MIC YM5 FL12 1.2A MIC213-.5YML L 5.5A MIC213-.8YML L 9.8A MIC YML L A No Yes 5-Pin SOT-23 6-Pin 2mm x 2mm MLF 5-Pin SOT-23 6-Pin 2mm x 2mm MLF MIC24/214 Part Number (1) Marking (2) Current Limit Kickstart Package MIC24-.5YM5 FE5.5A MIC24-.8YM5 FE8.8A MIC24-1.2YM5 FE12 1.2A MIC24-.5YML E 5.5A MIC24-.8YML E 8.8A MIC24-1.2YML E A MIC214-.5YM5 FM5.5A MIC214-.8YM5 FM8.8A MIC YM5 FM12 1.2A MIC214-.5YML M 5.5A MIC214-.8YML M 9.8A No 5-Pin SOT-23 6-Pin 2mm x 2mm MLF 5-Pin SOT-23 MIC YML M A Notes: 1. All MIC2XX Family parts are RoHS-compliant lead free. 2. Over/Under-bar symbol ( / _ ) may not be to scale. On the package the over/under symbol begins above/below the first character of the marking. Yes 6-Pin 2mm x 2mm MLF August M D

3 Ordering Information (Continued) MIC25 Part Number (1) Marking (2) Current Limit Enable Kickstart Package MIC25-.5YM6 FF5.5A Active High MIC25-.8YM6 FF8.8A Active High MIC25-1.2YM6 FF12 1.2A Active High MIC25-.5YML F 5.5A Active High MIC25-.8YML F 8.8A Active High MIC25-1.2YML F A Active High No 6-Pin SOT-23 6-Pin 2mm x 2mm MLF MIC25L Part Number (1) Marking (2) Current Limit Enable Kickstart Package MIC25-.5LYM5 5LFF.5A Active Low MIC25-.8LYM5 8LFF.8A Active Low No 5-Pin SOT-23 MIC25-1.2LYM5 4LFF 1.2A Active Low MIC25A Part Number (1) Marking (2) Current Limit Enable Kickstart Package MIC25A-1YM5 FA51.5A Active High 5-Pin SOT-23 MIC25A-2YM5 FA52.5A Active Low No MIC25A-1YM6 FA53.5A Active High 6-Pin SOT-23 MIC25A-2YM6 FA54.5A Active Low MIC215 Part Number (1) Marking (2) Current Limit Enable Kickstart Package MIC215-.5YM6 FN5.5A Active High MIC215-.8YM6 FN8.8A Active High MIC YM6 FN12 1.2A Active High MIC215-.5YML N 5.5A Active High MIC215-.8YML N 8.8A Active High 6-Pin SOT-23 MIC YML N A Active High Notes: 1. All MIC2XX Family parts are RoHS-compliant lead free. 2. Over/Under-bar symbol ( / _ ) may not be to scale. On the package the over/under symbol begins above/below the first character of the marking. Yes 6-Pin 2mm x 2mm MLF August M D

4 Ordering Information (Continued) MIC26/216 Part Number (1) Marking (2) Current Limit Kickstart Package MIC26-.5YM6 FG5.5A MIC26-.8YM6 FG8.8A MIC26-1.2YM6 FG12 1.2A MIC26-.5YML G 5.5A MIC26-.8YML G 8.8A MIC26-1.2YML G A MIC216-.5YM6 FP5.5A MIC216-.8YM6 FP8.8A MIC YM6 FP12 1.2A MIC216-.5YML P 5.5A MIC216-.8YML P 9.8A MIC YML P A No Yes 6-Pin SOT-23 6-Pin 2mm x 2mm MLF 6-Pin SOT-23 6-Pin 2mm x 2mm MLF MIC27/217 Part Number (1) Marking (2) Current Limit Kickstart Package MIC27YM6 FHAA 6-Pin SOT-23 No MIC27YML HA A 6-Pin 2mm x 2mm MLF.2A 2.A MIC217YM6 FQAA 6-Pin SOT-23 Yes MIC217YML QAA 6-Pin 2mm x 2mm MLF MIC28/218 Part Number (1) Marking (2) Current Limit Kickstart Package MIC28YM6 FJAA 6-Pin SOT-23 No MIC28YML JA A 6-Pin 2mm x 2mm MLF.2A 2.A MIC218YM6 FRAA 6-Pin SOT-23 Yes MIC218YML RAA 6-Pin 2mm x 2mm MLF MIC29/219 Part Number (1) Marking (2) Current Limit Kickstart Package MIC29YM6 FKAA 6-Pin SOT-23 No MIC29YML KA A 6-Pin 2mm x 2mm MLF.2A 2.A MIC219YM6 FSAA 6-Pin SOT-23 Yes MIC219YML SA A 6-Pin 2mm x 2mm MLF Notes: 1. All MIC2XX Family parts are RoHS-compliant lead free. 2. Over/Under-bar symbol ( / _ ) may not be to scale. On the package the over/under symbol begins above/below the first character of the marking. August M D

5 Ordering Information (Continued) MIC29A/219A Part Number (1) Marking (2) Current Limit Kickstart Enable Package MIC29A-1YM6 FK1 Active High No MIC29A-2YM6 FK2 Active Low.1 A.9 A 6-pin SOT-23 MIC219A-1YM6 FS1 Active High Yes MIC219A-2YM6 FS2 Active Low Notes: 1. All MIC2XX Family parts are RoHS-compliant lead free. 2. Over/Under-bar symbol ( / _ ) may not be to scale. On the package the over/under symbol begins above/below the first character of the marking. MIC2XX Family Member Functionality Part Number Normal Kickstart (1) I Limiting LIMIT I LIMIT ENABLE High ENABLE Low Pin Function (5) Load CSLEW FAULT/ VUVLO Discharge L (1) Fixed (2) 25A-1 (1) (6) 25A-2 (1) (6) Adj. (3) 29A-1 219A-1 29A-2 219A-2 Notes: 1. Kickstart provides an alternate start-up behavior; however, pin-outs are identical. 2. Kickstart not available. 3. Fixed = Factory-programmed current limit. 4. Adj. = User adjustable current limit. 5. VUVLO = Variable UVLO (Previously called DML). 6. CSLEW not available in 5-pin package. August M D

6 MIC2XX Family Member Pin Configuration Table, SOT Packages Normal Limiting Part Number Kickstart I LIMIT Pin Number VIN GND NC NC VOUT VIN GND EN NC VOUT VIN GND EN FAULT/ CSLEW VOUT 25L (1) Fixed (2) VIN GND EN FAULT/ VOUT 25Axxx6 (1) VIN GND EN FAULT/ CSLEW VOUT 25Axxx5 (1) VIN GND EN FAULT/ VOUT VIN GND EN VUVLO (4) CSLEW VOUT VIN GND EN ILIMIT CSLEW VOUT VIN GND EN ILIMIT CSLEW VOUT Adj. (3) VIN GND EN FAULT/ ILIMIT VOUT 29A 219A Notes: 1. Kickstart not available. 2. Fixed = Factory-programmed current limit. 3. I LIMIT = User adjustable current limit. 4. VUVLO = Variable UVLO (Previously called DLM). VIN GND EN FAULT/ ILIMIT VOUT MIC2XX Family Member Pin Configuration Table, MLF Packages (5) Part Number Pin Number Normal Limiting Kickstart I Limit VIN GND NC NC NC VOUT Fixed (2) VIN GND EN NC NC VOUT VIN GND EN FAULT/ CSLEW VOUT VIN GND EN VUVLO (4) CSLEW VOUT VIN GND EN ILIMIT CSLEW VOUT Adj. (3) VIN GND EN ILIMIT CSLEW VOUT Notes: 1. Kickstart not available. 2. Fixed = Factory-programmed current limit. 3. I LIMIT = User adjustable current limit. 4. VUVLO = Variable UVLO (Previously called DLM). 5. Connect EP to GND. VIN GND EN FAULT/ ILIMIT VOUT August M D

7 MIC2XX Family Member Pin Configuration Drawings Fixed Current Limit MIC2X3 VIN GND VOUT NC 3 4 NC 5-Pin SOT-23 (M5) 6-Pin MLF (ML) (Top View) MIC2X4 VIN GND VOUT ENABLE 3 4 NC 5-Pin SOT-23 (M5) 6-Pin MLF (ML) (Top View) MIC2X5 VIN 1 5 VOUT VIN 1 6 VOUT GND 2 GND 2 5 CSLEW ENABLE 3 4 FAULT/ ENABLE 3 4 FAULT/ 5-Pin SOT-23 (M5) MIC25-X.XL 6-Pin SOT-23 (M6) MIC2X5 6-Pin MLF (ML) (Top View) MIC2X5 MIC2X6 VIN 1 6 VOUT GND 2 5 CSLEW ENABLE 3 4 VUVLO 6-Pin SOT-23 (M6) 6-Pin MLF (ML) (Top View) August M D

8 MIC2XX Family Member Pin Configuration Drawings (Continued) Adjustable Current Limit MIC2X7/2X8 VIN 1 6 VOUT GND 2 5 CSLEW ENABLE 3 4 ILIMIT 6-Pin SOT-23 (M6) 6-Pin MLF (ML) (Top View) MIC2X9 VIN 1 6 VOUT GND 2 5 ILIMIT ENABLE 3 4 FAULT/ 6-Pin SOT-23 (M6) 6-Pin MLF (ML) (Top View) MIC25A VIN 1 5 VOUT VIN 1 6 VOUT GND 2 GND 2 5 CSLEW ENABLE 3 4 FAULT/ ENABLE 3 4 FAULT/ 5-Pin SOT-23 (M5) 6-Pin SOT-23 (M6) MIC29A VIN 1 6 VOUT GND 2 5 ILIMIT ENABLE 3 4 FAULT/ 6-Pin SOT-23 (M6) August M D

9 Descriptions These pin and signal descriptions aid in the differentiation of a pin from electrical signals and components connected to that pin. For example, VOUT is the switch s output pin, while V OUT is the electrical signal output voltage present at the VOUT pin. Pin Descriptions Pin Name Type Description VIN Input Supply input. This pin provides power to both the output switch and the switch s internal control circuitry. GND Ground. EN Input Switch Enable (Input): FAULT/ Output Fault status. A logic LOW on this pin indicates the switch is in current limiting, or has been shut down by the thermal protection circuit. This is an open-drain output allowing logical OR ing of multiple switches. CSLEW Input Slew rate control. Adding a small value capacitor between this pin and VIN slows turn-on of the power FET. VOUT Output Switch output. The load being driven by the switch is connected to this pin. VUVLO Input Variable Under Voltage Lockout (VUVLO): Monitors the input voltage through a resistor divider between VIN and GND. Shuts the switch off if voltage falls below the threshold set by the resistor divider. Previously called VUVLO. ILIMIT Input Set current limit threshold via a resistor connected from ILIMIT to GND. EP Thermal On MLF packages connect EP to GND. Signal Descriptions Signal Name Type Description V IN Input Electrical signal input voltage present at the VIN pin. GND Ground. V EN Input Electrical signal input voltage present at the ENABLE pin. V FAULT/ Output Electrical signal output voltage present at the FAULT/ pin. C SLEW Component Capacitance value connected to the CSLEW pin. V OUT Output Electrical signal output voltage present at the VOUT pin. V VUVLO_TH Internal VUVLO internal reference threshold voltage. This voltage is compared to the VUVLO pin input voltage to determine if the switch should be disabled. Reference threshold voltage has a typical value of 25mV. C LOAD Component Capacitance value connected in parallel with the load. Load capacitance. I OUT Output Electrical signal output current present at the VOUT pin. I LIMIT Internal Switch s current limit. Fixed at factory or user adjustable. August M D

10 Absolute Maximum Ratings (1) V IN, V OUT....3V to 6V All other pins....3v to 5.5V Power Dissipation (P D )... Internally Limited Continuous Output Current All except MIC25A / MIC2X9A A MIC25A / 2X9A... 1.A Maximum Junction Temperature (T J ) C Storage Temperature (T s ) C to +15 C Lead Temperature (Soldering 1 sec) C Operating Ratings (2) Supply Voltage V to 5.5V Continuous Output Current All except MIC25A / MIC2X9A... A to 2.1A MIC25A/2X9A... A to.9a Ambient Temperature Range (T A )... 4 C to+85 C Package Thermal Resistance (3) SOT-23-5/6 (θ JA )...23 C /W 2mm 2mm MLF (θ JA )...9 C /W 2mm 2mm MLF (θ JC )...45 C /W Electrical Characteristics (4) V IN = 5V, T A = 25 C unless otherwise specified. Bold indicates 4 C to +85 C limits; C IN = 1µF. Symbol Parameter Condition Min. Typ. Max. Units V IN Switch Input Voltage V I LEAK Output Leakage Current (5) Active Low Enable, V EN = 1.5V Switch = OFF, V OUT = V Active High Enable, V EN = V MIC25A, MIC29A, MIC219A I IN Supply Current (5) Switch = ON Active Low Enable, V EN = V Active High Enable, V EN = 1.5V Switch = OFF Active Low Enable, V EN = 1.5V Switch = OFF Active High Enable, V EN = V R DS(ON) Power Switch Resistance V IN = 5V, I OUT = 1mA MIC25A 12 1 µa I LIMIT Fixed Current Limit V OUT =.8 V IN A MIC29A, MIC219A C LF MIC219A Variable Current Limit Factors 275 I OUT =.9A, V OUT =.8 V IN I OUT =.5A, V OUT =.8 V IN I OUT =.2A, V OUT =.8 V IN I OUT =.1A, V OUT =.8 V IN I LIMIT_2nd Secondary Current Limit V IN = 2.5V, V OUT = V A Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Requires proper thermal mounting to achieve this performance 4. Specifications for packaged product only. 5. Check the Ordering Information section to determine which parts are Active High or Active Low. µa mω V August M D

11 Electrical Characteristics (4) (Continued) V IN = 5V, T A = 25 C unless otherwise specified. Bold indicates 4 C to +85 C limits; C IN = 1µF. Symbol Parameter Condition Min. Typ. Max. Units MIC23-MIC29, MIC213-MIC219, MIC25-X.XL I IN Supply Current (5) Switch = ON Active Low Enable, V EN = V Active High Enable, V EN = 1.5V Switch = OFF Active Low Enable, V EN = 1.5V Switch = OFF Active High Enable, V EN = V R DS(ON) Power Switch Resistance V IN = 5V, I OUT = 1mA MIC23-X.X, MIC24-X.X, MIC25-X.X, MIC26-X.X, MIC213-X.X, MIC214-X.X, MIC215-X.X MIC216-X.X, MIC25-X.XL I LIMIT MIC25-.5 Fixed Current Limit.5, V OUT =.8 V IN , V OUT =.8 V IN , V OUT =.8 V IN I LIMIT Fixed Current Limit V OUT =.8 V IN A MIC27, MIC28, MIC29, MIC217, MIC218, MIC219 C LF Variable Current Limit Factors MIC213, MIC214, MIC215, MIC216, MIC217, MIC218, MIC I OUT = 2.A, V OUT =.8 V IN I OUT = 1.A, V OUT =.8 V IN I OUT =.5A, V OUT =.8 V IN I OUT =.2A, V OUT =.8 V IN I LIMIT_2nd Secondary Current Limit V IN = 2.5V, V OUT = V A MIC26, MIC216 V UVLO_TH Variable UVLO Threshold mv MIC2x4, MIC2x7 R DSCHG Load Discharge Resistance V IN = 5V, I SINK = 5mA Ω MIC2X5, MIC2X6, MIC2X7, MIC2X8 I CSLEW C SLEW Input Current V V OUT.8V IN.175 µa µa mω A V August M D

12 Electrical Characteristics (4) (Continued) V IN = 5V, T A = 25 C unless otherwise specified. Bold indicates 4 C to +85 C limits; C IN = 1µF. Symbol Parameter Condition Min. Typ. Max. Units All Parts V IL (MAX).5 V EN ENABLE Input Voltage (6) V IH (MIN) 1.5 I EN ENABLE Input Current V V EN 5V 1 5 µa UVLO THRESHOLD UVLO HYSTERESIS Undervoltage Lock-Out V IN Rising Threshold V IN Falling Undervoltage Lock-Out Hysteresis V V.1 V V FAULT Fault Status Output Voltage I OL = 1mA.25.4 V Over-Temperature T J Increasing 145 OT THRESHOLD Threshold T J Decreasing 135 Note: 6. V IL(MAX) = Maximum positive voltage applied to the input which will be accepted by the device as a logic low. V IH(MAX) = Maximum positive voltage applied to the input which will be accepted by the device as a logic high. C August M D

13 AC Electrical Characteristics Symbol Parameter Condition Min. Typ. Max. Units t RISE t D_FAULT t D_LIMIT t RESET t ON_DLY t OFF_DLY Output Turn-on rise time Delay before asserting or releasing FAULT/ MIC23 MIC29 MIC29A, MIC25A Delay before asserting or releasing FAULT/ MIC213 MIC219 MIC219A Delay before current limiting MIC213 MIC219 MIC219A Delay before resetting Kickstart current limit delay, t D _ LIMIT MIC213 MIC219 MIC219A Output Turn-on Delay Output Turn-off Delay R L = 1Ω, C LOAD = 1µF, V OUT = 1% to 9% C SLEW (7) = Open Time from current limiting to FAULT/ state change Time from I OUT continuously exceeding primary current limit condition to FAULT/ state change Out of current limit following a current limit event. R L = 43Ω, C L = 12µF, V EN = 5% to V OUT = 1% *C SLEW = Open R L = 43Ω, C L = 12µF, V EN = 5% to V OUT = 9% *C SLEW = Open µs ms ms ms 1 15 µs 7 µs ESD (8) Symbol Parameter Condition Min. Typ. Max. Units V ESD_HB Electro Static Discharge Voltage: Human Body Model V OUT and GND ±4 All other pins ±2 kv V ESD_MCHN Electro Static Discharge Voltage; All pins Machine Model Machine Model ±2 V Notes: 7. Whenever C SLEW is present. 8. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 1pF. August M D

14 Timing Diagrams t RISE t FALL 9% 9% 1% 1% Rise and Fall Times ENABLE 5% 5% t ON_DLY t OFF_DLY VOUT 1% 9% Switching Delay Times August M D

15 Typical Characteristics SUPPLY CURRENT (µa) I LIMIT (A) R DS(ON) (mohm) V IN V OUT (mv) Supply Current Output Enabled MIC2XX C 6 25 C C V IN (V) V I LIMIT vs. Temperature (MIC2XX -.5) TEMPERATURE ( C) C 85 C C V IN (V) R DS(ON) vs. V IN (MIC2XX) V DROP vs. Temperature (MIC2XX-1.2) 16 V IN = 5.V C 85 C -4 C I OUT (A) SUPPLY CURRENT (µa) I LIMIT (A) R DS(ON) (mohm) V IN V OUT (mv) Supply Current Output Disabled (MIC2XX) -4 C 25 C 85 C V IN (V) V I LIMIT vs. Temperature (MIC2XX -.8) TEMPERATURE ( C) R DS(ON) vs. Temperature (MIC2XX) 2.5V 3.3V 5.V TEMPERATURE ( C) V DROP vs. Temperature (MIC2XX-1.2) 16 V IN = 3.3V C 85 C -4 C I OUT (A) LEAKAGE CURRENT (µa) I LIMIT (A) CURRENT-LIMIT THRESHOLD (ma) R SET (Ohms) Switch Leakage Current (MIC2XX) 5V TEMPERATURE ( C) V I LIMIT vs. Temperature (MIC2XX - 1.2) TEMPERATURE ( C) I LIMIT vs. Temperature (MIC2X9 -.9A) R SET = 267Ohms TEMPERATURE ( C) R SET vs. I LIMIT (MIC2X9) R SET = I LIMIT I LIMIT (A) August M D

16 Typical Characteristics (Continued) SUPPLY CURRENT (µa) I LIMIT (A) R DS(ON) (mohms) V IN - V OUT (mv) Supply Current Output Enabled (MIC2XXA) C 25 C 85 C V IN (V) V TEMPERATURE ( C) I LIMIT vs. Temperature (MIC2X5A) V IN (V) R DS(ON) vs. V IN (MIC2XXA) 25 C 85 C -4 C V DROP vs. Temperature (MIC2XXA) 16 V = 5.V IN C 85 C -4 C I OUT (A) SUPPLY CURRENT (µa) I LIMIT (A) R DS(ON) (mohms) V IN - V OUT (mv) Supply Current Output Disabled (MIC2XXA) -4 C 25 C 85 C V IN (V) I LIMIT vs. Temperature (MIC2X9A (.8A)) 1 R = 267Ohms 9 SET TEMPERATURE ( C) R DS(ON) vs. Temperature (MIC2XXA) 2.5V 3.3V 5.V TEMPERATURE ( C) V DROP vs. Temperature (MIC2XXA) 16 V = 3.3V IN C 85 C -4 C I OUT (A) LEAKAGE CURRENT (µa) R SET (Ohms) THRESHOLD (V) FLAG DELAY (ms) Switch Leakage Current (MIC2XXA) 5V TEMPERATURE ( C) 5 R SET vs. I LIMIT (MIC2X9A) R SET = I LIMIT I LIMIT (A) Flag Delay vs. Temperature 3.3V 5.V 2.5V TEMPERATURE ( C) UVLO Threshold vs. Temperature V RISING V FALLING TEMPERATURE ( C) August M D

17 Functional Characteristics August M D

18 Functional Characteristics (Continued) August M D

19 Functional Characteristics (Continued) August M D

20 Functional Diagram Figure 2. MIC2XX Family Functional Diagram August M D

21 Functional Description V IN and V OUT V IN is both the power supply connection for the internal circuitry driving the switch and the input (Source connection) of the power MOSFET switch. V OUT is the Drain connection of the power MOSFET and supplies power to the load. In a typical circuit, current flows from V IN to V OUT toward the load. Since the switch is bidirectional when enabled, if V OUT is greater than V IN, current will flow from V OUT to V IN. When the switch is disabled, current will not flow to the load, except for a small unavoidable leakage current of a few microamps. However, should V OUT exceed V IN by more than a diode drop (~.6 V), while the switch is disabled, current will flow from output to input via the power MOSFET s body diode. If discharging C LOAD is required by your application, consider using MIC2X4 or MIC2X7; these MIC2XX family members are equipped with a discharge FET to insure complete discharge of C LOAD. Current Sensing and Limiting MIC2XX protects the system power supply and load from damage by continuously monitoring current through the on-chip power MOSFET. Load current is monitored by means of a current mirror in parallel with the power MOSFET switch. Current limiting is invoked when the load exceeds the set over-current threshold. When current limiting is activated the output current is constrained to the limit value, and remains at this level until either the load/fault is removed, the load s current requirement drops below the limiting value, or the switch goes into thermal shutdown. Kickstart X X X Only parts in bold have Kickstart. (Not available in 5-pin SOT-23 packages) The MIC21X is designed to allow momentary current surges (Kickstart ) before the onset of current limiting, which permits dynamic loads, such as small disk drives or portable printers to draw the energy needed to overcome inertial loads without sacrificing system safety. In this respect, the Kickstart parts (MIC21X) differs markedly from the non-kickstart parts (MIC2X) which immediately limit load current, potentially starving the motor and causing the appliance to stall or stutter. During this delay period, typically 128ms, a secondary current limit is in effect. If the load demands a current in excess the secondary limit, MIC21X acts immediately to restrict output current to the secondary limit for the duration of the Kickstart period. After this time the MIC21X reverts to its normal current limit. An example of Kickstart operation is shown in Figure 3. Figure 3. Kickstart Operation Figure 3 Label Key: A. MIC21X is enabled into an excessive load (slew rate limiting not visible at this time scale) The initial current surge is limited by either the overall circuit resistance and power supply compliance, or the secondary current limit, whichever is less. B. R ON of the power FET increases due to internal heating (effect exaggerated for emphasis). C. Kickstart period. D. Current limiting initiated. FAULT/ goes LOW. E. V OUT is non-zero (load is heavy, but not a dead short where V OUT = V. Limiting response will be the same for dead shorts). F. Thermal shutdown followed by thermal cycling. G. Excessive load released, normal load remains. MIC21X drops out of current limiting. H. FAULT/ delay period followed by FAULT/ going HIGH. Undervoltage Lock-Out Undervoltage lock-out insures no anomalous operation occurs before the device s minimum input voltage of UVLO THRESHOLD which is 2V minimum, 2.25V typical, and 2.5V maximum had been achieved. Prior to reaching this voltage, the output switch (power MOSFET) is OFF and no circuit functions, such as FAULT/ or ENABLE, are considered to be valid or operative. August M D

22 Variable Undervoltage Lock Out (VUVLO) X X X Only parts in bold have VUVLO. V UVLO functions as an input voltage monitor when the switch in enabled. The V IN pin is monitored for a drop in voltage, indicating excessive loading of the V IN supply. When V IN is less than the V ULVO threshold voltage (V VUVLO_TH ) for 32ms or more, the MIC2XX disables the switch to protect the supply and allow V IN to recover. After 128ms has elapsed, the MIC2X6 enables switch. This disable and enable cycling will continue as long as V IN deceases below the V UVLO threshold voltage (V VUVLO_TH ) which has a typical value of 25mV. The V UVLO voltage is commonly established by a voltage divider from V IN -to-gnd. ENABLE X X X Only parts in bold have ENABLE pin. ENABLE pin is a logic compatible input which activates the main MOSFET switch thereby providing power to the V OUT pin. ENABLE is either an active HIGH or active LOW control signal. The MIC2XX can operate with logic running from supply voltages as low as 1.5 V. ENABLE may be driven higher than V IN, but no higher than 5.5V and not less than.3v. FAULT/ X X X Only parts in bold have FAULT/ pin. FAULT/ is an N-channel open-drain output, which is asserted (LOW true) when switch either begins current limiting or enters thermal shutdown. FAULT/ asserts after a brief delay when events occur that may be considered possible faults. This delay insures that FAULT/ is asserted only upon valid, enduring, over-current conditions and that transitory event error reports are filtered out. In MIC2X FAULT/ asserts after a brief delay period, of 32ms typical. After a fault clears, FAULT/ remains asserted for the delay period of 32ms MIC21X s FAULT/ asserts at the end of the Kickstart period which is 128ms typical. This masks initial current surges, such as would be seen by a motor load starting up. If the load current remains above the current limit threshold after the Kickstart has timed out, then the FAULT/ will be asserted. After a fault clears, FAULT/ remains asserted for the delay of 128ms. Because FAULT/ is an open-drain it must be pulled HIGH with an external resistor and it may be wire-or d with other similar outputs, sharing a single pull-up resistor. FAULT/ may be tied to a pull-up voltage source which is higher than V IN, but no greater than 5.5V. Soft-Start Control Large capacitive loads can create significant inrush current surges when charged through the switch. For this reason, the MIC2XX family of switches provides a built-in soft-start control to limit the initial inrush currents. Soft-start is accomplished by controlling the power MOSFET when the ENABLE pin enables the switch. C SLEW X X X Only parts in bold have CSLEW pin. (Not available in 5-pin SOT-23 packages) The C SLEW pin is provided to increase control of the output voltage ramp at turn-on. This input allows designers the option of decreasing the output s slew rate (slowing the voltage rise) by adding an external capacitance between the C SLEW and V IN pins. Thermal Shutdown Thermal shutdown is employed to protect the MIC2XX family of switches from damage should the die temperature exceed safe operating levels. Thermal shutdown shuts off the output MOSFET and asserts the FAULT/ output if the die temperature reaches 145 C. The switch will automatically resume operation when the die temperature cools down to 135 C. If resumed operation results in reheating of the die, another shutdown cycle will occur and the switch will continue cycling between ON and OFF states until the overcurrent condition has been resolved. Depending on PCB layout, package type, ambient temperature, etc., hundreds of milliseconds may elapse from the incidence of a fault to the output MOSFET being shut off. This delay is due to thermal time constants within the system itself. In no event will the device be damaged due to thermal overload because die temperature is monitored continuously by on-chip circuitry. August M D

23 Application Information Setting I LIMIT The MIC29/219 s current limit is user programmable and controlled by a resistor connected between the I LIMIT pin and GND. The value of this resistor is determined by the following equation: or I = LIMIT R SET = CurrentLimitFactor(CLF) R SET CurrentLimitFactor(CLF) I (A) LIMIT For example: Set I LIMIT = 1.25A Looking in the Electrical specifications we will find CLF at I LIMIT = 1A. Giving us a maximum I LIMIT variation over temperature of: I LIMIT_MIN I LIMIT_TYP I LIMIT_MAX.97A (-22%) 1.25A 1.5A (+2%) I OUT R SET I LIMIT_MIN I LIMIT_MAX.1A 1928Ω.63A.136A.2A 993Ω.137A.265A.3A 673Ω.216A.391A.4A 511Ω.296A.515A.5A 413Ω.379A.637A.6A 346Ω.463A.759A.7A 299Ω.548A.88A.8A 263Ω.634A 1.1A.9A 235Ω.722A 1.121A Min Typ Max Units V Table 2. MIC2x9A R SET Table Table 1. CLF at I LIMIT = 1A For the sake of this example, we will say the typical value of CLF at an I OUT of 1A is 243V. Applying the equation above: R SET 243V ( Ω) = = Ω 1.25A R SET = 196Ω (the closest standard 1% value) Designers should be aware that variations in the measured I LIMIT for a given R SET resistor, will occur because of small differences between individual ICs (inherent in silicon processing) resulting in a spread of I LIMIT values. In the example above we used the typical value of CLF to calculate R SET. We can determine I LIMIT s spread by using the minimum and maximum values of CLF and the calculated value of R SET. I OUT R SET I LIMIT_MIN I LIMIT_MAX.2A 1125Ω.127A.267A.3A 765Ω.22A.39A.4A 582Ω.281A.51A.5A 47Ω.361A.629A.6A 395Ω.443A.746A.7A 341Ω.526A.861A.8A 3Ω.61A.976A.9A 268Ω.695A 1.89A 1A 243Ω.781A 1.22A 1.1A 222Ω.868A 1.314A 1.2A 24Ω.956A 1.426A 1.3A 189Ω 1.44A 1.537A 1.4A 176Ω 1.133A 1.647A 1.5A 165Ω 1.222A 1.757A Table 3. MIC2x9 R SET Table 19V I LIMIT_MIN = =.97A 196Ω 293V I LIMIT_MAX = = 1.5A 196Ω August M D

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