OBSOLETE PRODUCT TYPICAL APPLICATIONS. LT A Positive Adjustable Voltage Regulator FEATURES DESCRIPTIO APPLICATIO S

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1 OBSOLETE PRODCT DATA SHEET FOR REFERENCE ONLY Consult for possible alternate source. FEATRES Guaranteed.% Initial Tolerance Guaranteed.% Load Regulation Guaranteed A Output Current % Thermal Limit Burn-In A Transient Output Current Standard Adjustable Pinout Operates to 5V APPLICATIO S System Power Supplies High Power Linear Regulator Battery Chargers Power Driver Constant Current Regulator DESCRIPTIO A Positive Adjustable Voltage Regulator The LT is a three terminal regulator which is capable of providing in excess of A output current over.v to V range. The device is packaged in a standard T- power package and is plug-in compatible with industry standard adjustable regulators, such as the LM and LM. Also, the is a functional replacement for the LM9. In addition to excellent load and line regulations, the is fully protected by current limiting, safe area protection and thermal shutdown. New current limiting circuitry allows transient load currents up to A to be supplied for 5µs without causing the regulator to current limit and drop out of regulation during the transient. On-chip trimming of initial reference voltage to ±.% combined with.% load regulation minimize errors in all high current applications. Further, the is manufactured with standard bipolar processing and has Linear Technology s high reliability., LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIONS V 5V, A Regulator Load Regulation Ω % 5Ω % 5V AT A µf µf TA OTPT VOLTAGE DEVIATION (%)..... = 5V = V PRELOAD = ma I OT = A I OT = A TEMPERATRE ( C) TA

2 ABSOLTE AXI RATI GS W W W (Note ) Power Dissipation... Internally Limited Input to Output Voltage Differential... 5V Operating Junction Temperature Range M Control Circuitry C to 5 C M Power Transistor C to C C Control Circuitry... C to 5 C C Power Transistor... C to 5 C Storage Temperature Range... 5 C to 5 C Lead Temperature (Soldering, sec)... C PRECO DITIO I G % Thermal Limit Burn-in W PACKAGE/ORDER I FOR ATIO BOTTOM VIEW CASE IS OTPT K PACKAGE -LEAD TO- METAL CAN T JMAX = C, θ JA = 5 C/W OBSOLETE PACKAGE ORDER PART NMBER MK CK ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = 5 C. (Note ) M C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V REF Reference Voltage I OT = ma, T j = 5 C V V ( ) 5V V ma I OT A, P 5W Line Regulation V ( ) 5V, %/V I OT = ma (Note ).... %/V Load Regulation ma I OT A (Note ) I OT V ( ) 5V.... % V ( ) 5V.... % Thermal Regulation ms Pulse..5.. %/W Ripple Rejection = V, f = Hz C = µf db C = µf 5 5 db I Adjust Pin Current 5 5 µa I Adjust Pin Current Change ma I OT A V ( ) 5V.. µa Minimum Load Current ( ) = 5V ma ( ) V ma I SC Current Limit ( ) V DC A Transient (.5ms) A ( ) = V, T j = 5 C A Temperature Stability % Temp Long Term Stability T A = 5 C, Hours.. % Time e n RMS Output Noise Hz f khz.. % (% of ) θ JC Thermal Resistance Power Transistor C/W Junction to Case Control Circuity.5.5 C/W

3 ELECTRICAL CHARACTERISTICS Note : Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note : nless otherwise specified, these specifications apply: = 5V and I OT = 5A. These specifications are applicable for power dissipations up to 5W. At input-output voltage differentials greater than V, achievable output current and power dissipation decrease due to protection circuitry. Note : See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. TYPICAL PERFOR A CE CHARACTERISTICS W INPT-OTPT DIFFERENTIAL (V) Dropout Voltage Adjustment Current Temperature Stability = mv I OT = A I OT = A I OT = A STMENT CRRENT (µa) REFERENCE VOLTAGE (V) TEMPERATRE ( C) TEMPERATRE ( C) TEMPERATRE ( C) 5 TA G G OTPT IMPEDANCE (Ω).... Output Impedance Minimum Operating Current Ripple Rejection = 5V = V I OT = A C = µf C OT = µf k k k M FREQENCY (Hz) C = µf C OT = µf QIESCENT CRRENT (ma) T j = 5 C T j = 5 C T j = 55 C INPT-OTPT DIFFERENTIAL (V) RIPPLE REJECTION (db) = 5V I OT = A f = Hz T j = 5 C C = µf C = µf OTPT VOLTAGE (V) G G5 G

4 TYPICAL PERFOR A CE CHARACTERISTICS RIPPLE REJECTION (db) OTPT CRRENT (A). W Ripple Rejection Ripple Rejection Current Limit C = µf C = µf k k k M FREQENCY (Hz) = 5V = V I OT = A G RIPPLE REJECTION (db) 5. = 5V = V f = Hz T CASE = 5 C C = µf C = µf OTPT CRRENT (A) Current Limit Current Limit Line Transient Response PRELOAD = A = V = 5V T CASE = 5 C PRELOAD = A TIME (ms) OTPT CRRENT (A). G PRELOAD CRRENT = A T CASE = 5 C = V = 5V = V = V TIME (ms) OTPT CRRENT (A) OTPT VOLTAGE DEVIATION (V) INPT VOLTAGE CHANGE (V) PEAK CRRENT LIMIT DC CRRENT LIMIT T CASE = 5 C PRELOAD = A PRELOAD = A PRELOAD = A INPT-OTPT DIFFERENTIAL (V) C L = µf; C L = µf 95 G = V I OT = ma T j = 5 C C OT = A C = A TIME (µs) LTXXX GXX OTPT VOLTAGE DEVIATION (V) LOAD CRRENT (A) Load Transient Response = 5V = V T CASE = 5 C PRELOAD = ma C L = µf; C = µf C L = µf; C = µf G TIME (µs) G G

5 APPLICATIO S I FOR General ATIO W The develops a.5v reference voltage between the output and the adjustment terminal (see Figure ). By placing a resistor, R, between these two terminals, a constant current is caused to flow through R and down through R to set the overall output voltage. Normally this current is the specified minimum load current of ma or ma. Because I is very small and constant when compared with the current through R, it represents a small error and can usually be ignored. Bypass Capacitors Input bypassing using a µf tantalum or 5µF electrolytic is recommended when the input filter capacitors are more than 5 inches from the device. Improved ripple rejection (db) can be accomplished by adding a µf capacitor from the pin to ground. Increasing the size of the capacitor to µf will help ripple rejection at low output voltage since the reactance of this capacitor should be small compared to the voltage setting resistor, R. For improved AC transient response and to prevent the possibility of oscillation due to unknown reactive load, a µf capacitor is also recommended at the output. Because of their low impedance at high frequencies, the best type of capacitor to use is solid tantalum. Protection Diodes The does not require a protection diode from the adjustment terminal to the output (see Figure ). Improved internal circuitry eliminates the need for this diode when the adjustment pin is bypassed with a capacitor to improve ripple rejection. I 5µA V REF R = V REF ( ) I R R R R F C µf D N If a very large output capacitor is used, such as a µf shown in Figure, the regulator could be damaged or destroyed if the input is accidentally shorted to ground or crowbarred, due to the output capacitor discharging into the output terminal of the regulator. To prevent this, a diode, D as shown, is recommended to safely discharge the capacitor. Load Regulation Because the is a three-terminal device, it is not possible to provide true remote load sensing. Load regulation will be limited by the resistance of the wire connecting the regulator to the load. The data sheet specification for load regulation is measured at the bottom of the package. Negative side sensing can be a true Kelvin connection if the bottom of resistor R is returned to the negative side of the load. Although it may not be immediately obvious, best load regulation is obtained when the top of the resistor divider, R, is connected directly to the case, not to the load. This is illustrated in Figure. If R were connected to the load, the effective resistance between the regulator and the load would be: R p R R R R p = Parasitic Line Resistance Connected as shown, R p is not multiplied by the divider ratio. R p is about.ω per foot using gauge wire. This translates to mv/ft at A load current, so it is important to keep the lead between the regulator and the load as short as possible, and use large wire or PC board traces. R R * C OT µf *NOT NEEDED F R p PARASITIC LINE RESISTANCE R CONNECT R TO CASE R CONNECT R TO LOAD R L F Figure. Basic Adjustable Regulator Figure Figure. Connections for Best Load Regulation 5

6 TYPICAL APPLICATIO S Paralleling Regulators FEET # WIRE* R =.5 ( ) R I OT = A TO A.5Ω R Ω * THE # WIRE ACTS AS BALLAST RESISTANCE INSRING CRRENT SHARING BETWEEN BOTH DEVICES R TA A Variable Regulator* V AC T TRIAD F-9 CB Ω T L MHz N C 5,µF 5Ω*.5k µf V TO 5V A TO A CB Ω LT-. N N µf 5Ω 5V LT-.5 k* k OTPT ST k k *% FILM RESISTOR L-DALE TO-5 TYPE T-STANCOR Z- N LT 5V 5V 5V LT GENERAL PRPOSE REGLATOR WITH SCR PREREGLATOR TO LOWER POWER DISSIPATION. ABOT V DIFFERENTIAL IS MAINTAINED ACROSS THE INDEPENDENT OF OTPT VOLTAGE AND LOAD CRRENT. 5k k k*.µf NC pf 5k 5V N9 k LMA 5V µf 5V k* k* 5V.k LT-. TA

7 TYPICAL APPLICATIO S Improving Ripple Rejection.V to 5V Adjustable Regulator 5V Regulator with Shutdown µf 5V R Ω % R 5Ω % C* µf V OT C* µf R 5k R Ω C µf TTL µf k k N9 5V Ω % 5Ω % *C IMPROVES RIPPLE REJECTION. X C SHOLD BE SMALL COMPARED TO R. TA5 *NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS OPTIONAL IMPROVES TRANSIENT RESPONSE VOT =.5V ( R/R) TA TA Remote Sensing Temperature Compensated Lead Acid Battery Charger R p (MAX DROP mv) VIN 5V OTPT A Ω % k* RETRN 5Ω Ω 5Ω LMA pf k 5µF 5Ω R L RETRN TA 5k N9 CHARGE *LOAD ON BATTERY µa WHEN NOT CHARGING 5Ω N9 THERMALLY COPLED k* 5k* V TA9 SCHE ATIC DIAGRA W W Ω Ω 9Ω 5Ω 5.k k Q Ω Q Q Q9 Q k Q5 k Q Ω Q Q Q k Ω.k Q Q Q Q Q.k k k 5.k Q Q5 k C pf C pf Q9.k Q Q Q.k k Q Q.k Q k C 5pF k Q5 Ω Ω Q Ω Ω Q Q Ω D.V k.5ω D.V Ω SD 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.

8 TYPICAL APPLICATIO S Lamp Flasher 5V µf OFF k µf k µf N9 V Automatic Light Control Protected High Current Lamp Driver.k TTL OR CMOS V A 5V k µf k k 9 TA 9 TA 9 TA PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. K Package -Lead TO- Metal Can (mil Diameter Leads) (LTC DWG # 5--)..9 (9.9.)..5 (..9)..5 (9. 9.9)..5 (.5.9).. ( ).55.5 (..5).5. (..9) DIA, PLACES.. (..9).5. (..5).5.5 (..5).. (..9) OBSOLETE PACKAGE.9.5 (.5.95) R.. (..9) R K(TO-) 9 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LT Low Dropout,.% Load Regulation.5A Max Current Output LT5 Low Dropout, mv at A Best Replacement LT5 Low Dropout,.5% Load Regulation A Max Current Output LT55 Low Dropout,.5% Load Regulation 5A Max Current Output fa LT/TP.5K REV A PRINTED IN SA Linear Technology Corporation McCarthy Blvd., Milpitas, CA 955- () -9 FAX: () -5 LINEAR TECHNOLOGY CORPORATION

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