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2 LT/LT/LT5 7.5A, 5A, A Low Dropout Positive Adjustable Regulators FEATRES Three-Terminal Adjustable Output Current of A, 5A or 7.5A Operates Down to V Dropout Guaranteed Dropout Voltage at Multiple Current Levels Line Regulation:.5% Load Regulation:.% % Thermal Limit Functional Test Fixed Versions Available Available in -Lead Plastic TO-, TO-P and DD Packages APPLICATIO S High Efficiency Linear Regulators Post Regulators for Switching Supplies Constant Current Regulators Battery Chargers DEVICE PT CRRENT* LT 7.5A LT 5.A LT5.A *For a.5a low dropout regulator see the LT data sheet. DESCRIPTIO The LT series of positive adjustable regulators are designed to provide 7.5A, 5A and A with higher efficiency than currently available devices. All internal circuitry is designed to operate down to V input-to-output differential and the dropout voltage is fully specified as a function of load current. Dropout is guaranteed at a maximum of.5v at maximum output current, decreasing at lower load currents. On-chip trimming adjusts the reference voltage to %. Current limit is also trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions. The LT/LT/LT5 devices are pin compatible with older three-terminal regulators. A µf output capacitor is required on these new devices. However, this is included in most regulator designs. nlike PNP regulators, where up to % of the output current is wasted as quiescent current, the LT quiescent current flows into the load, increasing efficiency., LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO 5V, 7.5A Regulator Dropout Voltage vs Output Current.5V LT µf *REQIRED FOR STABILITY Ω % 5Ω % 5V AT 7.5A µf* TANTALM //5 TA PT/PT VOLTAGE DIFFERENTIAL (V) PT CRRENT I FLL LOAD //5 TA 5fe

3 LT/LT/LT5 ABSOLTE MAXIMM RATGS W W W Power Dissipation... Internally Limited Input-to-Output Voltage Differential C Grades... V I Grades... V M Grades (OBSOLETE)... 5V Operating Junction Temperature Range C Grades: Control Section... C to 5 C Power Transistor... C to 5 C I Grades: Control Section... C to 5 C Power Transistor... C to 5 C (Note ) M Grades: (OBSOLETE) Control Section C to 5 C Power Transistor C to C Storage Temperature Range... 5 C to 5 C Lead Temperature (Soldering, sec)... C PRECO DITIO I G % thermal shutdown functional test. PACKAGE/ORDER FORMATION TAB IS PT FRONT VIEW T PACKAGE -LEAD PLASTIC TO- θ JA = 5 C/W W ORDER PART NMBER LTCT LTIT LT5CT LT5IT TAB IS PT FRONT VIEW P PACKAGE -LEAD PLASTIC TO-P θ JA = 5 C/W ORDER PART NMBER LTCP LTCP BOTTOM VIEW CASE IS PT LTCK LTMK LTCK LTMK LT5CK LT5MK TAB IS PT FRONT VIEW M PACKAGE -LEAD PLASTIC DD LT5CM K PACKAGE -LEAD TO- METAL CAN θ JA = 5 C/W OBSOLETE PACKAGE θ JA = C/W* *WITH PACKAGE SOLDERED TO.5 COPPER AREA OVER BACKSIDE GROND PLANE OR TERNAL POWER PLANE. θ JA CAN VARY FROM C/W TO > C/W DEPENDG ON MONTG TECHNIQE. ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = 5 C. PARAMETER CONDITIONS M TYP MAX NITS Reference Voltage I = ma, T J = 5 C, ( ) = V..5. V ma I I FLL LOAD.5V ( ) 5V (Notes,, 7) V Line Regulation I LOAD = ma,.5v ( ) 5V, T J = 5 C (Notes, ).5. %.5. % M Grade: 5V ( ) 5V (Notes, ).5.5 % C, I Grades: 5V ( ) V (Notes, ).5.5 % 5fe

4 ELECTRICAL CHARACTERISTICS LT/LT/LT5 The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = 5 C. PARAMETER CONDITIONS M TYP MAX NITS Load Regulation ( ) = V ma I I FLL LOAD T J = 5 C (Notes,,, ).. %.. % Dropout Voltage V REF = %, I = I FLLLOAD (Notes 5,, )..5 V Current Limit LT ( ) = 5V. 9.5 A ( ) = 5V.. A LT ( ) = 5V A ( ) = 5V.. A LT5 ( ) = 5V.. A ( ) = 5V..5 A Minimum Load Current ( ) = 5V 5 ma Thermal Regulation T A = 5 C, ms Pulse LT.. %/W LT..5 %/W LT5.. %/W Ripple Rejection f = Hz, C = 5µF, C = 5µF Tantalum I = I FLL LOAD, ( ) = V (Notes, 7, ) 75 db Adjust Pin Current T J = 5 C 55 µa µa Adjust Pin Current Change ma I I FLL LOAD.5V ( ) 5V (Note ). 5 µa Temperature Stability.5 % Long Term Stability T A = 5 C, Hrs. % RMS Output Noise (% of ) T A = 5 C Hz = f khz. % Thermal Resistance Junction-to-Case Control Circuitry/Power Transistor LT K Package./. C/W P Package.5/. C/W LT K Package.75/. C/W P Package.5/. C/W T Package.5/.7 C/W LT5 K Package.9/. C/W M, T Packages.7/. C/W Note : Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 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. Note : Line and load regulation are guaranteed up to the maximum power dissapation (W for the LT, 5W for the LT (K, P), W for the LT (T) and W for the LT5). Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output voltage range. Note : I FLL LOAD is defined in the current limit curves. The I FLLLOAD curve is defined as the minimum value of current limit as a function of input-to-output voltage. Note that the W power dissipation for the LT (5W for the LT (K, P), W for the LT (T), W for the LT5) is only achievable over a limited range of input-to-output voltage. Note 5: Dropout voltage is specified over the full output current range of the device. Test points and limits are shown on the Dropout Voltage curve. Note : For LT I FLL LOAD is 5A for 55 C T J < C and 7.5A for T J C. Note 7:.7V ( ) 5V for LT at 55 C T J C. Note : Dropout is.7v maximum for LT at 55 C T J C. 5fe

5 LT/LT/LT5 TYPICAL PERFORMANCE CHARACTERISTICS W MIMM PT/PT DIFFERENTIAL (V) MIMN PT/PT DIFFERENTIAL (V) MIMM PT/PT DIFFERENTIAL (V) LT LT LT Dropout Voltage Short-Circut Current Load Regulation DICATES GARANTEED TEST POT C T J 5 C C T J 5 C T J = 5 C T J = 5 C T J = 55 C PT CRRENT (A) LT//5 G DICATES GARANTEED TEST POT C T J 5 C T J = 5 C 55 C T J 5 C T J = 5 C PT CRRENT (A) T J = 55 C LT//5 G PT CRRENT (A) 5 SHORT-CIRCIT CRRENT (A) SHORT-CIRCIT CRRENT (A) SHORT-CIRCIT CRRENT (A) C I FLL LOAD GARANTEED 5 C 5 C PT/PT DIFFERENTIAL (V) I FLL LOAD GARANTEED 5 C 5 C 55 C LT//5 G PT/PT DIFFERENTIAL (V) 55 C I FLL LOAD GARANTEED 5 C 5 C LT//5 G PT/PT DIFFERENTIAL (V) PT VOLTAGE DEVIATION (%) PT VOLTAGE DEVIATION (%) PT VOLTAGE DEVIATION (%) I = 7.5A LT LT LT Dropout Voltage Short-Circut Current Load Regulation LT5 LT5 LT5 Dropout Voltage Short-Circut Current Load Regulation DICATES GARANTEED TEST POT C T J 5 C T J = 5 C 55 C T J 5 C T J = 5 C T J = 55 C TEMPERATRE ( C) I = 5A LT//5 G TEMPERATRE ( C) I = A LT//5 G TEMPERATRE ( C) LT//5 G7 LT//5 G LT//5 G9 5fe

6 LT/LT/LT5 TYPICAL PERFORMANCE CHARACTERISTICS W MIMM OPERATG CRRENT (ma) Minimum Operating Current Temperature Stability Adjust Pin Current T J = 5 C T J = 5 C T J = 55 C PT/PT DIFFERENTIAL (V) REFERENCE VOLTAGE (V) TEMPERATRE ( C) ST P CRRENT (µa) TEMPERATRE ( C) LT//5 G LT//5 G LT//5 G RIPPLE REJECTION (db) RIPPLE REJECTION (db) LT LT LT Ripple Rejection Ripple Rejection vs Current Maximum Power Dissipation* V RIPPLE V P-P ( ) V DROP V RIPPLE.5V P-P ( ) V C = µf AT FREQENCIES < Hz C = 5µF AT FREQENCIES > Hz I = 7A k k k FREQENCY (Hz) //5 G RIPPLE REJECTION (db) f R = khz V RIPPLE.5V P-P = 5V C = 5µF C = 5µF f R = Hz V RIPPLE V P-P 5 7 PT CRRENT (A) //5 G POWER (W) 9 7 LTMK 5 LTCP LTCK CASE TEMPERATRE ( C) * AS LIMITED BY MAXIMM JNCTION TEMPERATRE LT LT LT Ripple Rejection Ripple Rejection vs Current Maximum Power Dissipation* V RIPPLE V P-P ( ) V DROP V RIPPLE.5V P-P ( ) V C = µf AT FREQENCIES < Hz C = 5µF AT FREQENCIES > Hz I = 5A k k k FREQENCY (Hz) //5 G RIPPLE REJECTION (db) f R = khz V RIPPLE.5V P-P = 5V C = 5µF C = 5µF f R = Hz V RIPPLE V P-P 5 PT CRRENT (A) //5 G7 POWER (W) 5 LTCT LTCK LTMK LTCP LT//5 G CASE TEMPERATRE ( C) * AS LIMITED BY MAXIMM JNCTION TEMPERATRE LT//5 G 5fe 5

7 LT/LT/LT5 TYPICAL PERFORMANCE CHARACTERISTICS RIPPLE REJECTION (db) W LT5 LT5 LT5 Ripple Rejection Ripple Rejection vs Current Maximum Power Dissipation* V RIPPLE V P-P ( ) V DROP V RIPPLE.5V P-P ( ) V C = µf AT FREQENCIES < Hz C = 5µF AT FREQENCIES > Hz I = A k k k FREQENCY (Hz) //5 G9 RIPPLE REJECTION (db) f R = Hz V RIPPLE V P-P f R = khz V RIPPLE.5V P-P = 5V C = 5µF C = 5µF PT CRRENT (A) //5 G POWER (W) 5 LT5MK LT5CK LT5CT CASE TEMPERATRE ( C) * AS LIMITED BY MAXIMM JNCTION TEMPERATRE LT//5 G PT VOLTAGE DEVIATION (V) LOAD CRRENT (A)..... LT LT LT5 Load Transient Response Load Transient Response Load Transient Response C = 5 TIME (µs) C = µf C = µf C = µf TANTALM =V =V PRELOAD=mA PT VOLTAGE DEVIATION (V) LOAD CRRENT (A) C = C = µf C = µf TANTALM 5 TIME (µs) C = µf = V = V PRELOAD=mA PT VOLTAGE DEVIATION (V) LOAD CRRENT (A) C = C = µf C = µf TANTALM 5 TIME (µs) C = µf = V = V PRELOAD=mA //5 G //5 G //5 G PT VOLTAGE DEVIATION (mv) PT DEVIATION (V) LT LT LT5 Line Transient Response Line Transient Response Line Transient Response C = C = µf = V I =.A C = µf TANTALM C = µf TANTALM PT VOLTAGE DEVIATION (V) PT DEVIATION (V) C = C = µf = V I =.A C = µf TANTALM C = µf TANTALM PT VOLTAGE DEVIATION (mv) PT DEVIATION (V) C = C = µf = V I =.A C = µf TANTALM C = µf TANTALM TIME (µs) TIME (µs) TIME (µs) //5 G5 //5 G //5 G7 5fe

8 BLOCK DIAGRAM W LT/LT/LT5 THERMAL LIMIT //5 BD V APPLICATIONS FORMATION W The LT family of three-terminal adjustable regulators is easy to use and has all the protection features that are expected in high performance voltage regulators. They are short-circuit protected, and have safe area protection as well as thermal shutdown to turn off the regulator should the junction temperature exceed about 5 C. These regulators are pin compatible with older threeterminal adjustable devices, offer lower dropout voltage and more precise reference tolerance. Further, the reference stability with temperature is improved over older types of regulators. The only circuit difference between using the LT family and older regulators is that this new family requires an output capacitor for stability. Stability The circuit design used in the LT family requires the use of an output capacitor as part of the device frequency compensation. For all operating conditions, the addition of 5µF aluminium electrolytic or a µf solid tantalum on the output will ensure stability. Normally, capacitors much smaller than this can be used with the LT. Many different types of capacitors with widely varying characteristics are available. These capacitors differ in capacitor tolerance (sometimes ranging up to ±%), equivalent series resistance, and capacitance temperature coefficient. The 5µF or µf values given will ensure stability. When the adjustment terminal is bypassed to improve the ripple rejection, the requirement for an output capacitor increases. The value of µf tantalum or 5µF aluminum covers all cases of bypassing the adjustment terminal. Without bypassing the adjustment terminal, smaller capacitors can be used with equally good results and the table below shows approximately what size capacitors are needed to ensure stability. Recommended Capacitor Values PT PT STMENT µf µf Tantalum, 5µF Aluminum None µf µf Tantalum, 5µF Aluminum µf 5fe 7

9 LT/LT/LT5 APPLICATIONS FORMATION W Normally, capacitor values on the order of µf are used in the output of many regulators to ensure good transient response with heavy load current changes. Output capacitance can be increased without limit and larger values of output capacitor further improve stability and transient response of the LT regulators. Another possible stability problem that can occur in monolithic IC regulators is current limit oscillations. These can occur because, in current limit, the safe area protection exhibits a negative impedance. The safe area protection decreases the current limit as the input-to-output voltage increases. That is the equivalent of having a negative resistance since increasing voltage causes current to decrease. Negative resistance during current limit is not unique to the LT series and has been present on all power IC regulators. The value of the negative resistance is a function of how fast the current limit is folded back as input-to-output voltage increases. This negative resistance can react with capacitors or inductors on the input to cause oscillation during current limiting. Depending on the value of series resistance, the overall circuitry may end up unstable. Since this is a system problem, it is not necessarily easy to solve; however, it does not cause any problems with the IC regulator and can usually be ignored. Protection Diodes In normal operation, the LT family does not need any protection diodes. Older adjustable regulators required protection diodes between the adjustment pin and the output and from the output to the input to prevent overstressing the die. The internal current paths on the LT adjustment pin are limited by internal resistors. Therefore, even with capacitors on the adjustment pin, no protection diode is needed to ensure device safety under short-circuit conditions. Diodes between input and output are usually not needed. The internal diode between the input and the output pins of the LT family can handle microsecond surge currents of 5A to A. Even with large output capacitances, it is very difficult to get those values of surge currents in normal operations. Only with a high value of output capacitors, such as µf to 5µF and with the input pin instantaneously shorted to ground, can damage occur. A crowbar circuit at the input of the LT can generate those kinds of currents, and a diode from output to input is then recommended. Normal power supply cycling or even plugging and unplugging in the system will not generate current large enough to do any damage. The adjustment pin can be driven on a transient basis ±5V, with respect to the output without any device degradation. Of course, as with any IC regulator, exceeding the maximum input to output voltage differential causes the internal transistors to break down and none of the protection circuitry is functional. D N (OPTIONAL) LT C µf R R C 5µF //5 F Overload Recovery Like any of the IC power regulators, the LT has safe area protection. The safe area protection decreases the current limit as input-to-output voltage increases and keeps the power transistor inside a safe operating region for all values of input-to-output voltage. The LT protection is designed to provide some output current at all values of input-to-output voltage up to the device breakdown. When power is first turned on, as the input voltage rises, the output follows the input, allowing the regulator to start up into very heavy loads. During the start-up, as the input voltage is rising, the input-to-output voltage differential remains small, allowing the regulator to supply large output currents. With high input voltage, a problem can occur wherein removal of an output short will not allow the output voltage to recover. Older regulators, such as the 7 series, also exhibited this phenomenon, so it is not unique to the LT. 5fe

10 APPLICATIONS FORMATION W The problem occurs with a heavy output load when the input voltage is high and the output voltage is low, such as immediately after removal of a short. The load line for such a load may intersect the output current curve at two points. If this happens, there are two stable output operating points for the regulator. With this double intersection, the power supply may need to be cycled down to zero and brought up again to make the output recover. LT/LT/LT5 I 5µA = V REF LT R ( R ) I R V REF R R Figure. Basic Adjustable Regulator //5 F Ripple Rejection The typical curves for ripple rejection reflect values for a bypassed adjustment pin. This curve will be true for all values of output voltage. For proper bypassing and ripple rejection approaching the values shown, the impedance of the adjust pin capacitor at the ripple frequency should be less than the value of R, (normally Ω to Ω). The size of the required adjust pin capacitor is a function of the input ripple frequency. At Hz the adjust pin capacitor should be 5µF if R = Ω. At khz only.µf is needed. For circuits without an adjust pin bypass capacitor, the ripple rejection will be a function of output voltage. The output ripple will increase directly as a ratio of the output voltage to the reference voltage ( /V REF ). For example, with the output voltage equal to 5V and no adjust pin capacitor, the output ripple will be higher by the ratio of 5V/.5V or four times larger. Ripple rejection will be degraded by db from the value shown on the typical curve. Output Voltage The LT develops a.5v reference voltage between the output and the adjust 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. Because I is very small and constant when compared with the current through R, it represents a small error and can usually be ignored. Load Regulation Because the LT 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 is a true Kelvin connection, with the bottom of the output divider 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 RP Parasitic Line R, = Resistance LT *CONNECT R TO CASE CONNECT R TO LOAD R P PARASITIC LE RESISTANCE R* R* //5 F Figure. Connections for Best Load Regulation R L 5fe 9

11 LT/LT/LT5 APPLICATIONS FORMATION W 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 positive lead between regulator and load as short as possible and use large wire or PC board traces. Thermal Considerations The LT series of regulators have internal power and thermal limiting circuitry designed to protect the device under overload conditions. For continuous normal load conditions however, maximum junction temperature ratings must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambient. This includes junction-to-case, caseto-heat sink interface, and heat sink resistance itself. New thermal resistance specifications have been developed to more accurately reflect device temperature and ensure safe operating temperatures. The data section for these new regulators provides a separate thermal resistance and maximum junction temperature for both the Control Section and the Power Transistor. Previous regulators, with a single junction-to-case thermal resistance specification, used an average of the two values provided here and therefore could allow excessive junction temperatures under certain conditions of ambient temperature and heat sink resistance. To avoid this possibility, calculations should be made for both sections to ensure that both thermal limits are met. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. This is the lowest resistance path for heat flow. Proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. Thermal compound at the case-to-heat sink interface is strongly recommended. If the case of the device must be electrically isolated, a thermally conductive spacer can be used, as long as its added contribution to thermal resistance is considered. Note that the case of all devices in this series is electrically connected to the output. For example, using an LTCK (TO-, Commercial) and assuming: (max continuous) = 9V, = 5V, I = A, T A = 75 C, θ HEAT SK = C/W, θ CASE-TO-HEAT SK =. C/W for K package with thermal compound. Power dissipation under these conditions is equal to: P D = ( )(I ) = W Junction temperature will be equal to: T J = T A P D (θ HEAT SK θ CASE-TO-HEAT SK θ JC ) For the Control Section: T J = 75 C W ( C/W. C/W. C/W) = C C < 5 C = T JMAX (Control Section Commercial Range) For the Power Transistor: T J = 75 C W ( C/W. C/W. C/W) = C C < 5 C = T JMAX (Power Transistor Commercial Range) In both cases the junction temperature is below the maximum rating for the respective sections, ensuring reliable operation. 5fe

12 LT/LT/LT5 TYPICAL APPLICATIONS 7.5A Variable Regulator VAC T TRIAD F-9 CB Ω Ω T L MH N C 5,µF LT LT-. 75Ω*.5k V TO 5V OA TO 7.5A µf N CB N µf 5Ω 5V N9 k* k PT ST LT-. k k N 5k LT 5V 5V 7 k.µf NC k* pf k*.7k 5V 7 5V LT * % FILM RESISTOR L: DALE TO-5 TYPE T: STANCOR Z- GENERAL PRPOSE REGLATOR WITH SCR PREREGLATOR TO LOWER POWER DISSIPATION. AB.7V DIFFERENTIAL IS MATAED ACROSS THE LT DEPENDENT OF PT VOLTAGE AND LOAD CRRENT N9 k 5K 5V LMA 7 5V 5V µf k* LT//5 TA5 5fe

13 LT/LT/LT5 TYPICAL APPLICATIONS Paralleling Regulators LT.5Ω FEET # WIRE* ( ) =.5V R R I = A TO 5A LT R Ω *THE # WIRE ACTS AS BALLAST RESISTANCE SRG CRRENT SHARG BETWEEN BOTH DEVICES R LT//5 TA Improving Ripple Rejection µf LT R Ω % R 5Ω % C 5µF* 5V 5µF *C IMPROVES RIPPLE REJECTION. X C SHOLD BE < R AT RIPPLE FREQENCY //5 TA Remote Sensing µf LT Ω 5Ω 5Ω µf R P (MAX DROP mv) 7 LMA pf 5µF k R L 5V RETRN 5Ω RETRN //5 TA7 5fe

14 LT/LT/LT5 TYPICAL APPLICATIONS High Efficiency Regulator with Switching Preregulator V k mh MR,µF 7Ω LT Ω V N9 k k M N k LT k V //5 TA N9.V to 5V Adjustable Regulator C* µf LT R k R 9.9Ω C µf *NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS ( ) V =.5V R R //5 TA 5V Regulator with Shutdown* TTL µf k LT N9 k Ω % 5Ω % 5V µf *PT SHTS DOWN TO.V //5 TA9 5fe

15 LT/LT/LT5 PACKAGE DESCRIPTION K Package -Lead TO- Metal Can (LTC DWG # 5--) (9.9.)..5 (..9) (9. 9.9)..5 (.5.9).. ( ) (. 7.5).5. (..9) DIA, PLCS.. (.7.9).. (.95.9).5.5 (..5) OBSOLETE PACKAGE.7.77 (.7.9).9.5 (.5.95) R.7.77 (..9) R K (TO-) 9 M Package -Lead Plastic DD Pak (LTC DWG # 5--).5 (.5). (.5). (.5) TYP.9.5 (9.9.5) 5.5. (.9.57).5.55 (..97). (.5). (.)..7 (. 9.9).59 (.99)... (... ). (7.).75 (.95) BOTTOM VIEW OF DD PAK HATCHED AREA IS SOLDER PLATED COPPER HEAT SK RECOMMENDED SOLDER PAD LAY.... (..5.5 ).5 (.7). (.5) BSC... (..5) RECOMMENDED SOLDER PAD LAY FOR THICKER SOLDER PASTE APPLICATIONS (..9).5 ±. (.7 ±.5) NOTE:. DIMENSIONS CH/(MILLIMETER). DRAWG NOT TO SCALE M (DD) 5fe

16 LT/LT/LT5 PACKAGE DESCRIPTION P Package -Lead Plastic TO-P (Similar to TO-7) (LTC DWG # 5--5).5 (.).5 (.55).75 (.95)..O (5.75.) MONTG HOLE.5.5 (.9.) DIA.7.7 (.75 5.).. (.5.).5 (.7).7 (7.7)..7 (..).5.OO (.7 5.).7.OO (. 5.) EJECTOR P MARKS.5.5 (.7.) DIA.9 (.9). (.9).7. (9..).7 (.) MAX 7 BOTTOM VIEW OF TO-P HATCHED AREA IS SOLDER PLATED COPPER HEAT SK..5 (.7.).7. (..).5 (5.) BSC.. (.7.).7. (..59).. (.5.) P T Package -Lead Plastic TO- (LTC DWG # 5--).9.5 (9.9.5).7.55 (.7.97) DIA.5. (.9.57).5.55 (..97)..7 (5..5)..5 (..7)..7 (. 9.9).57. (.7 5.7).9.7 (.9 7.7).5.57 (..7)..5 (5.57.). (.5) BSC.. (.7.95).5 (.7) TYP.. (..5).95.5 (..9) T (TO-) 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. 5fe 5

17 LT/LT/LT5 TYPICAL APPLICATIONS Automatic Light Control LT.k µf µf //5 TA Protected High Current Lamp Driver V 5A LT 5V TTL OR CMOS //5 TA k RELATED PARTS PART NMBER DESCRIPTION COMMENTS LT.5A Low Dropout Regulator Fixed.5V,.V,.V, 5V and V Output LT7 ma Low Dropout Regulator Fixed.5V,.V, 5V or Adjustable Output LT5/LT55/LT57 7A/.A/A Fast Response Low Dropout Regulators For High Performance Microprocessors LT5 7A Very Low Dropout Linear Regulator.5V Dropout at 7A, Fixed.5 and Adjustable LT5 A Very Low Dropout Linear Regulator.V Dropout at A, Fixed.5 and Adjustable LT High Power Step-Down Switching Regulator 5V to.v at A, >9% Efficiency LT575 ltrafast TM Transient Response LDO Controller External MOSFET Pass Element LT57 ltrafast Transient Response LDO Controller External PNP Pass Element ltrafast is a trademark of Linear Technology Corporation. Linear Technology Corporation McCarthy Blvd., Milpitas, CA ()-9 FAX: () fe LT/LT 55 REV E PRTED SA LEAR TECHNOLOGY CORPORATION 99