LT1070/LT1071 5A and 2.5A High Efficiency Switching Regulators FEATURES DESCRIPTIO n Wide Input Voltage Range: 3V to 60V The LT 1070/LT1071 are monolithic high power switch- n Low Quiescent Current: 6mA ing regulators. They can be operated in all standard switch- n ing configurations including buck, boost, flyback, for- Internal 5A Switch (2.5A for LT1071) n ward, inverting and Cuk. A high current, high efficiency Very Few External Parts Required n switch is included on the die along with all oscillator, Self Protected Against Overloads control and protection circuitry. Integration of all func- n Operates in Nearly All Switching Topologies tions allows the LT1070/LT1071 to be built in a standard n Shutdown Mode Draws Only 50m A Supply Current 5-pin T0-220 power package. This makes it extremely n Flyback Regulated Mode Has Fully Floating Outputs easy to use and provides bust proof operation similar to n Comes in Standard 5-Pin TO-220 Package that obtained with 3-pin linear regulators. n Can be Externally Synchronized (Consult Factory) The LT1070/LT1071 operate with supply voltages from 3V U APPLICATIO S to 60V, and draw only 6mA quiescent current. They can deliver load power up to 100W with no external power n Logic Supply 5V at 10A devices. By utilizing current mode switching techniques, n 5V Logic to 15V Op Amp Supply they provide excellent AC and DC load and line regulation. n Off-Line Converter Up to 200W The LT1070/LT1071 have many unique features not found n Battery Upconverter even on the vastly more difficult to use low power control n Power Inverter (+ to ) or ( to +) chips presently available. They use adaptive antisat switch n Fully Floating Multiple Outputs drive to allow very wide ranging load currents with no loss n For Lower Current Applications, See the LT1072 in efficiency. An externally activated shutdown mode USER NOTE: reduces total supply current to 50m A typical for standby This data sheet is only intended to provide specifications, graphs and a general functional operation. Totally isolated and regulated outputs can be description of the LT1070/LT1071. Application circuits are included to show the capability of the LT1070/LT1071. A complete design manual (AN19) should be obtained to assist in developing new generated by using the optional flyback regulation mode designs. This manual contains a comprehensive discussion of both the LT1070 and the external components used with it, as well as complete formulas for calculating the values of these built into the LT1070/LT1071, without the need for components. The manual can also be used for the LT1071 by factoring in the lower switch current optocouplers or extra transformer windings. rating. A second Application Note, AN25, which details off-line applications is available. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Maximum Output Power* Boost Converter (5V to 12V) 100 L2 10m H 80 BOOST BUCK/BOOST 5V L1** OUTPUT C3 V = 30V O 150m H FILTER 60 100m F FLYBACK D1 V 12V 40 IN V SW ISOLATED 1A + R1 + C2 LT1070 10.7k C3* 20 1000m F 1% 100m F BUCK/BOOST FB V = 5V GND V O C 0 R2 0 10 20 30 40 50 R3 1.24k 1k INPUT VOLTAGE (V) 1% C1 1070/71 TA02 1m F *ROUGH GUIDE ONLY. BUCK MODE P = 5A V . OUT OUT *REQUIRED IF INPUT LEADS 2 SPECIAL TOPOLOGIES DELIVER MORE POWER 1070/71 TA01 **PULSE ENGINEERING 92113 **DIVIDE VERTICAL POWER SCALE BY 2 FOR LT1071 10701fe 1 POWER (W)** U ULT1070/LT1071 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage Operating Junction Temperature Range LT1070/LT1071 (Note 2) .................................... 40V Commercial (Operating) ....................... 0 C to 100 C LT1070HV/LT1071HV (Note 2) .......................... 60V Commercial (Short Circuit)................... 0 C to 125 C Switch Output Voltage Industrial ......................................... 40 C to 125 C LT1070/LT1071 .................................................. 65V Military (OBSOLETE) ................. 55 C to 150 C LT1070HV/LT1071HV ........................................ 75V Storage Temperature Range ................ 65 C to 150 C Feedback Pin Voltage (Transient, 1ms) ................ 15V Lead Temperature (Soldering, 10 sec)................. 300 C PACKAGE/ORDER INFORMATION BOTTOM VIEW ORDER PART ORDER PART V V NUMBER NUMBER SW C FRONT VIEW 1 LT1070CT LT1070CK 2 5 V IN CASE LT1070HVCT LT1070HVCK IS GND 4 V SW 3 4 LT1070HVIT LT1070HVMK 3 GND 2 FB LT1070IT LT1070IK V FB IN 1 V C LT1071CT LT1070MK K PACKAGE T PACKAGE 4-LEAD TO-3 METAL CAN LT1071HVCT LT1071CK 5-LEAD PLASTIC TO-220 T = 100 C, q = 35 C/ W, Q = 2 C (LT1070C, I) JMAX JA JC LT1071HVIT LT1071HVCK T = 100 C, q = 75 C/ W, Q = 2 C (LT1070C, I) T = 150 C, q = 35 C/ W, Q = 2 C (LT1070M) JMAX JA JC JMAX JA JC T = 100 C, q = 75 C/ W, Q = 4 C (LT1071C) T = 100 C, q = 35 C/ W, Q = 4 C (LT1071C, I) LT1071IT JMAX JA JC LT1071HVMK JMAX JA JC T = 150 C, q = 35 C/ W, Q = 4 C (LT1071M) JMAX JA JC LT1071MK OBSOLETE PACKAGE Consider the T5 Package for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 15V, V = 0.5V, V = V , output pin open unless otherwise specified. A IN C FB REF SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Reference Voltage Measured at Feedback Pin, V = 0.8V 1.224 1.244 1.264 V REF C l 1.214 1.244 1.274 V I Feedback Input Current V = V 350 750 nA B FB REF l 1100 nA g Error Amplifier Transconductance D I = 25m A 3000 4400 6000 m mho m C l 2400 7000 m mho Error Amplifier Source or Sink Current V = 1.5V 150 200 350 m A C l 120 400 m A Error Amplifier Clamp Voltage Hi Clamp, V = 1V 1.80 2.30 V FB Lo Clamp, V = 1.5V 0.25 0.38 0.52 V FB Reference Voltage Line Regulation 3V V V , V = 0.8V l 0.03 %/V IN MAX C A Error Amplifier Voltage Gain 0.9V V 1.4V 500 800 V/V V C Minimum Input Voltage l 2.6 3.0 V I Supply Current 3V V V , V = 0.6V 6 9 mA Q IN MAX C Control Pin Threshold Duty Cycle = 0 0.8 0.9 1.08 V l 0.6 1.25 V Normal/Flyback Threshold on Feedback Pin 0.4 0.45 0.54 V 10701fe 2 U W U W U WW