APPLICATIO S. LTC MHz Step-Up DC/DC Converter in SOT-23 FEATURES DESCRIPTIO TYPICAL APPLICATIO

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1 .2MHz Step-p DC/DC Converter in SOT-23 FEATRES Internal 2A MOSFET Switch.2MHz Switching Frequency Integrated Soft-Start Low.6V Operation Low R DS(ON) Switch: 00mΩ at 5V Output Delivers 5V at 0mA from a 3.3V Input Delivers 3.3V at 0mA from a 2.5V Input ses Small, Low Profile External Components Low Profile (mm) SOT-23 (ThinSOT TM ) Package APPLICATIO S White LED Driver Supply Local 3.3V or 5V Supply Battery Back-p DESCRIPTIO The LTC 3426 step-up switching regulator generates an output voltage of up to 5.5V from an input voltage as low as.6v. Ideal for applications where space is limited, it switches at.2mhz, allowing the use of tiny, low cost and low profile external components. Its internal 2A, 00mΩ NMOS switch provides high efficiency even at heavy load, while the constant frequency, current mode architecture results in low, predictable output noise that is easy to filter. Antiringing circuitry reduces EMI concerns by damping the inductor while in discontinuous mode, and internal soft-start eases inrush current worries. Internal frequency compensation is designed to accommodate ceramic output capacitors, further reducing noise. The device features very low shutdown current of 0.5µA. The is available in the 6-lead SOT-23 package., LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by.s. Patents, including , 663 TYPICAL APPLICATIO 3.3V to 5V Boost Converter 3.3V 0µF 2.2µH 5V 0mA = 3.3V = 5V 3426 TA LOAD CRRENT (ma) 3426 TA0b

2 ABSOLTE AXI RATI GS W W W (Note ) Voltage V to 6V Voltage V to 6V, Voltage V to 6V V to 6V Operating Temperature Range (Note 2).. 40 C to 85 C Storage Temperature Range C to 25 C Lead Temperature (Soldering, 0 sec) C W PACKAGE/ORDER I FOR ATIO 2 3 TOP VIEW S6 PACKAGE 6-LEAD PLASTIC TSOT-23 T JMAX = 25 C, θ JA = 65 C/W, θ JC = 02 C/W ORDER PART NMBER ES6 S6 PART NMBER LTAJT Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. CO VERTER CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = 25 C. =.8V, = 3.3V, unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX NITS Input Voltage Range =.6 V Output Voltage Adjust Range V Feedback Voltage V Feedback Input Current V =.23V 0. µa Quiescent Current (Shutdown) V = 0V, Not Including Switch Leakage µa Quiescent Current =, Not Switching µa Switch Leakage V = 5V µa Switch On Resistance = 3.3V 0. Ω = 5V 0.0 Ω Current Limit A Maximum Duty Cycle V =.5V 85 % Switching Frequency MHz Input High V Input Low 0.4 V Input Current = 5.5V µa Note : Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The is guaranteed to meet performance specifications from 0 C to 85 C. Specifications over the 40 C to 85 C operating temperature are assured by design, characterization and correlation with statistical process controls. Note 3: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 25 C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. 2

3 TYPICAL PERFOR A CE CHARACTERISTICS W FREQENCY (MHz) Oscillator Frequency vs Temperature vs FIGRE CIRCIT T A = 25 C I LOAD = ma = 5V C OT = L = 2.2µH I OT(MAX) (A) I OT(MAX) vs FIGRE CIRCIT T A = 25 C = 5V C OT = L = 2.2µH TEMPERATRE ( C) (V) (V) G0 LT08 TP 3426 G R DS(ON) vs Temperature.25 Pin Voltage Switching Waveforms mV/DIV RDS(ON) (Ω) = 2.5V = 3.3V = 5V VOLTAGE (V) V/DIV I L 200mA/DIV TEMPERATRE ( C) TEMPERATRE ( C) =.8V = 3.3V C OT = L = 2.5µH 00ns/DIV 3426 G G G05 Pin Antiringing Operation Transient Response V/DIV 0mV/DIV I OT 200mA/DIV 2mA 0mA I L ma/div I L 0mA/DIV =.8V = 3.3V 00ns/DIV 3426 G07 =.8V = 3.3V C OT = L = 2.5µH 40µs/DIV 3426 G08 3

4 PI F CTIO S (Pin ): Switch Pin. Connect inductor between and. A Schottky diode is connected between and. Keep these PCB trace lengths as short and wide as possible to reduce EMI and voltage overshoot. If the inductor current falls to zero, an internal 00Ω antiringing switch is connected from to to minimize EMI. (Pin 2): Signal and Power Ground. Provide a short direct PCB path between and the ( ) side of the output capacitor(s). (Pin 3): Feedback Input to the g m Error Amplifier. Connect resistor divider tap to this pin. The output voltage can be adjusted from 2.5V to 5V by: (Pin 4): Logic Controlled Shutdown Input. = High: Normal free running operation = Low: Shutdown, quiescent current < µa Typically, should be connected to through a M pull-up resistor. (Pin 5): Output Voltage Sense Input. The NMOS switch gate drive is derived from the greater of and. (Pin 6): Input Supply. Must be locally bypassed. R VOT = BLOCK DIAGRA W.22V REFERENCE 3 + A R C C C Σ COMPARATOR + A2 5 6 PWM LOGIC AND DRIVER Ω R (EXTERNAL) (EXTERNAL) RAMP GENERATOR 4 SHTDOWN AND SOFT-START.2MHz OSCILLATOR F0 Figure 4

5 OPERATIO The is a monolithic.2mhz boost converter housed in a 6-lead SOT-23 package. The device features fixed frequency, current mode PWM control for excellent line and load regulation. The low R DS(ON) NMOS switch enables the device to maintain high efficiency over a wide range of load current. Operation of the feedback loop which sets the peak inductor current to keep the output in regulation can be best understood by referring to the Block Diagram in Figure. At the start of each clock cycle a latch in the PWM logic is set and the NMOS switch is turned on. The sum of a voltage proportional to the switch current and a slope compensating voltage ramp is fed to the positive input to the PWM comparator. When this voltage exceeds either a voltage proportional to the 2A current limit or the PWM control voltage, the latch in the PWM logic is reset and NMOS switch is turned off. The PWM APPLICATIO S I FOR ATIO Setting the Output Voltage W The output voltage,, is set by a resistive divider from to ground. The divider tap is tied to the pin. is set by the formula: R VOT = Inductor Selection The can utilize small surface mount inductors due to its.2mhz switching frequency. A.5µH or 2.2µH inductor will be the best choice for most applications. Larger values of inductance will allow greater output current capability by reducing the inductor ripple current. Increasing the inductance above 3.3µH will increase component size while providing little improvement in output current capability. The inductor current ripple is typically set for 20% to 40% of the maximum inductor current (I P ). High frequency ferrite core inductor materials reduce frequency dependent power losses compared to cheaper powdered iron types, improving efficiency. The inductor should have low DCR (DC resistance) control voltage at the output of the error amplifier is the amplified and compensated difference between the feedback voltage on the pin and the internal reference voltage of.22v. If the control voltage increases, more current is delivered to the output. When the control voltage exceeds the I LIMIT reference voltage, the peak current is limited to a minimum of 2A. The current limit helps protect the internal switch and external components connected to it. If the control voltage decreases, less current is delivered to the output. During load transients control voltage may decrease to the point where no switching occurs until the feedback voltage drops below the reference. The has an integrated soft-start feature which slowly ramps up the feedback control node from 0V. The soft-start is initiated when is pulled high. to reduce the I 2 R power losses, and must be able to handle the peak inductor current without saturating. Several inductor manufacturers are listed in Table. Table. Inductor Manufacturers TDK Sumida Murata Output and Input Capacitor Selection Low ESR (equivalent series resistance) capacitors should be used to minimize the output voltage ripple. Multilayer ceramic capacitors are an excellent choice as they have extremely low ESR and are available in small footprints. A 5µF to 30µF output capacitor is sufficient for most applications. X5R and X7R dielectric materials are preferred for their ability to maintain capacitance over wide voltage and temperature ranges. Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the input supply. It follows that ceramic capacitors are also a good choice for input decoupling and should be located as close as 5

6 APPLICATIO S I FOR ATIO W possible to the device. A 0µF input capacitor is sufficient for most applications. Table 2 shows a list of several ceramic capacitor manufacturers. Consult the manufacturers for detailed information in their entire selection of ceramic parts. Table 2. Ceramic Capacitor Manufacturers Taiyo Yuden Murata TDK PCB Layout Guidelines The high speed operation of the demands careful attention to board layout. You will not get advertised performance with careless layout. Figure 2 shows the recommended component placement. A large ground pin copper area will help to lower the chip temperature. Diode Selection A Schottky diode is recommended for use with the. se of a low forward voltage diode such as the ON Semiconductor MBRA20LT3 is recommended. A Schottky diode rated at 2A is recommended for use with the F02 Figure 2. Recommended Component Placement for Single Layer Board 6

7 TYPICAL APPLICATIO S 3.3V C 0µF L 2.2µH D R 95.3k 30.9k 5V 0mA C: TAIYO YDEN X5R JMK22BJ475ML : TAIYO YDEN X5R JMK36BJ226ML D: ON SEMICONDCTOR MBRA20LT3 L: COILCRAFT D0336P TA02a LOAD CRRENT (ma) 3426 TA02b.8V C 0µF L.5µH D C: TDK C8X5R0J06M : TAIYO YDEN JMK36BJ226ML D: ON SEMICONDCTOR MBRM20LT3 L: TDK RLF30T-R5N6R R 64.9k 6.9k 3426 TA03a 2.5V 0mA LOAD CRRENT (ma) 3426 TA03b 7

8 TYPICAL APPLICATIO S 3V TO 4.2V C 0µF L 2.2µH D R 95.3k 30.9k 5V 7mA AT 3V = 4.2V = 3V C: TDK C8X5R0J475M : TAIYO YDEN JMK36BJ226ML D: ON SEMICONDCTOR MB0VLSFT L: SMIDA CDRH4D TA04a LOAD CRRENT (ma) 3426 TA04b 2.5V L 2.5µH D 00 C 0µF R 75k 44.2k 3.3V 0mA C: TDK C8X5R0J06 : TAIYO YDEN JMK36BJ266 D: ON SEMICONDCTOR MBRM20LT3 L: SMIDA CDRH5D28-2R TA05a LOAD CRRENT (ma) 3426 TA05b 8

9 TYPICAL APPLICATIO S.8V L.5µH D 00 C 0µF R 75k 44.2k 3.3V 540mA C: TDK C8X5R0J06M : TAIYO YDEN JMK36BJ226ML D: ON SEMICONDCTOR MBRM20LT3 L: TDK RLF30T-R5N6R 3426 TA06a LOAD CRRENT (ma) 3426 TA06b.8V L 2.2µH D C 0µF R 95.3k 30.9k 5V 400mA C: TDK C8X5R0J475M : TAIYO YDEN JMK36BJ226ML D: ON SEMICONDCTOR MB0VLSFT L: SMIDA CDRH4D TA07a LOAD CRRENT (ma) 3426 TA07b 9

10 TYPICAL APPLICATIO S 2.5V L 2.5µH D 00 C 0µF R 95.3k 30.9k 5V 5mA C: TDK C8X5R0J06 : TAIYO YDEN JMK36BJ266 D: ON SEMICONDCTOR MBRM20LT3 L: SMIDA CDRH5D28-2R TA08a LOAD CRRENT (ma) 3426 TA08b 0

11 PACKAGE DESCRIPTIO S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # Rev B) 0.62 MAX 0.95 REF 2. BSC (NOTE 4).22 REF 3.85 MAX 2.62 REF.4 MIN 2. BSC..75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOT PER IPC CALCLATOR 0.95 BSC PLCS (NOTE 3) BSC DATM A.00 MAX REF (NOTE 3) NOTE:. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLSIVE OF PLATING 4. DIMENSIONS ARE EXCLSIVE OF MOLD FLASH AND METAL BRR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-93. BSC S6 TSOT REV B Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

12 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LT63 5mA (I ),.4MHz, High Step-p %, : 0.9V to 0V, (MAX) = 34V, I Q = 3mA, DC/DC Converter I SD < µa, ThinSOT LT946/LT946A.5A (I ),.2MHz/2.7MHz, High Step-p High, : 2.45V to 6V, (MAX) = 34V, I Q = 3.2mA, DC/DC Converter I SD < µa, MS8 LTC3400/LTC3400B 0mA (I ),.2MHz, Synchronous Step-p 92%, : 0.5V to 5V, (MAX) = 5V, I Q = 9µA/300µA, DC/DC Converter I SD < µa, ThinSOT LTC340/LTC3402 A/2A (I ), 3MHz, Synchronous Step-p DC/DC 97%, : 0.5V to 5V, (MAX) = 5.5V, I Q = 38µA, Converter I SD < µa, MS0 LTC342 3A (I ), 3MHz, Synchronous Step-p DC/DC Converter 95%, : 0.5V to 4.5V, (MAX) = 5.25V, I Q = 2µA, with Output Disconnect I SD < µa, QFN24 LTC3425 5A (I ), 8MHz, 4-Phase Synchronous Step-p DC/DC 95%, : 0.5V to 4.5V, (MAX) = 5.25V, I Q = 2µA, Converter with Output Disconnect I SD < µa, QFN32 LTC3429 0mA (I ), 5kHz, Synchronous Step-p %, : 0.5V to 4.3V, (MAX) = 5V, I Q = 20µA, DC/DC Converter with Soft-Start/Output Disconnect I SD < µa, ThinSOT LTC3436 3A (I ), MHz, High Step-p DC/DC Converter : 3V to 25V, (MAX) = 34V, I Q = 0.9mA, I SD < 6µA, TSSOP6E LTC mA (I ), 0V Micropower Synchronous Boost :.5V to 5.5V, (MAX) = 0V, I Q = 0µA, I SD < µa, ThinSOT Converter in ThinSOT LTC mA (I ), High Step-p DC/DC Converter : 2.3V to 0V, (MAX) = 34V, I Q = 25µA, I SD < µa, ThinSOT with Schottky and PNP Disconnect 2 Linear Technology Corporation 630 McCarthy Blvd., Milpitas, CA (408) FAX: (408) LT 0307 REV A PRINTED IN THE SA LINEAR TECHNOLOGY CORPORATION 2004

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