LT1170/LT1171/LT1172 100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators Fea T Descrip T n Wide Input Voltage Range: 3V to 60V The LT 1170/LT1171/LT1172 are monolithic high power- n switching regulators. They can be operated in all standard Low Quiescent Current: 6mA n switching configurations including buck, boost, flyback, Internal 5A Switch forward, inverting and Cuk. A high current, high efficiency (2.5A for LT1171, 1.25A for LT1172) n switch is included on the die along with all oscillator, con- Shutdown Mode Draws Only 50A Supply Current n trol and protection circuitry. Integration of all functions Very Few External Parts Required n allows the LT1170/LT1171/LT1172 to be built in a standard Self-Protected Against Overloads n 5-pin TO-3 or TO-220 power package as well as the 8-pin Operates in Nearly All Switching Topologies n packages (LT1172). This makes them extremely easy to Flyback-Regulated Mode Has Fully Floating Outputs n use and provides bust proof operation similar to that Comes in Standard 5-Pin Packages n obtained with 3-pin linear regulators. LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages The LT1170/LT1171/LT1172 operate with supply voltages n Can Be Externally Synchronized from 3V to 60V, and draw only 6mA quiescent current. They can deliver load power up to 100W with no exter- a T nal power devices. By utilizing current-mode switching n techniques, they provide excellent AC and DC load and Logic Supply 5V at 10A n line regulation. 5V Logic to 15V Op Amp Supply n Battery Upconverter The LT1170/LT1171/LT1172 have many unique features not n Power Inverter (+ to ) or ( to +) found even on the vastly more difficult to use low power n Fully Floating Multiple Outputs control chips presently available. They use adaptive antisat USER NOTE: switch drive to allow very wide ranging load currents with This data sheet is only intended to provide specifications, graphs, and a general functional no loss in efficiency. An externally activated shutdown description of the LT1170/LT1171/LT1172. Application circuits are included to show the capability of the LT1170/LT1171/LT1172. A complete design manual (AN19) should be obtained to assist in mode reduces total supply current to 50A typically for developing new 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 standby operation. of these components. The manual can also be used for the LT1170/LT1171/LT1172 by factoring in L, LT, LTC, LTM, Linear Technology, the Linear logo are registered trademarks of Linear the higher frequency. A CAD design program called SwitcherCAD is also available. Technology Corporation. All other trademarks are the property of their respective owners. Typical a T Boost Converter (5V to 12V) Maximum Output Power* 100 * ROUGH GUIDE ONLY. BUCK MODE L1** 5V L2 OUTPUT LT1170 P = (5A)(V ) 50H OUT OUT 10H FILTER SPECIAL TOPOLOGIES DELIVER 80 MORE POWER. C3 ** DIVIDE VERTICAL POWER SCALE 100F D1 BUCK-BOOST BY TWO FOR LT1171, BY FOUR V MBR330 V = 30V FOR LT1172. IN O 60 12V V BOOST SW LT1170/1/2 TA02 1A FLYBACK + R1 C2 LT1170 10.7k 40 + 1000F 1% C3* 100F FB 20 V GND C BUCK-BOOST R2 R3 V = 5V 1.24k O 1k 1% 0 C1 0 10 20 30 40 50 1F INPUT VOLTAGE (V) *REQUIRED IF INPUT LEADS 2 ** COILTRONICS 50-2-52 1170/1/2 TA01 PULSE ENGINEERING 92114 117012fi 1 For more information www.linear.com/LT1170 POWER (W) ** ion pplica ions pplica ion uresLT1170/LT1171/LT1172 (Note 1) a Te Maxi Mu M r a T Supply Voltage Operating Junction Temperature Range LT1170/LT1171/LT1172HV (Note 2) .......................60V LT1170M/LT1171M (OBSOLETE) ....... 55C to 150C LT1170/LT1171/LT1172 (Note 2) ............................40V LT1172M (OBSOLETE) ....................... 55C to 125C Switch Output Voltage LT1170/LT1171/LT1172HVC, LT1170/LT1171/LT1172HV .....................................75V LT1170/LT1171/LT1172C (Oper.) ............. 0C to 100C LT1170/LT1171/LT1172 .........................................65V LT1170/LT1171/LT1172HVC LT1172S8 ..............................................................60V LT1170/LT1171/LT1172C (Sh. Ckt.) ........ 0C to 125C Feedback Pin Voltage (Transient, 1ms) ................... 15V LT1170/LT1171/LT1172HVI, Storage Temperature Range .................. 65C to 150C LT1170/LT1171/LT1172I (Oper.) .......... 40C to 100C Lead Temperature (Soldering, 10 sec ....................300C LT1170/LT1171/LT1172HVI, LT1170/LT1171/LT1172I (Sh. Ckt.) ...... 40C to 125C p in c F T BOTTOM VIEW V V TOP VIEW TOP VIEW SW C 1 GND 1 8 E2 GND 1 8 E2 2 CASE 3 IS GND 4 V 2 7 V V 2 7 V C SW C SW FB 3 E1 FB 3 E1 V 6 6 IN FB K PACKAGE NC* 4 5 V NC* 4 5 V IN IN 4-LEAD TO-3 METAL CAN LT1170MK: T = 150C, = 2C/W, = 35C/W N8 PACKAGE S8 PACKAGE J8 PACKAGE JMAX JC JA LT1170CK: T = 100C, = 2C/W, = 35C/W 8-LEAD PDIP 8-LEAD PLASTIC SO 8-LEAD CERDIP JMAX JC JA LT1171MK: T = 150C, = 4C/W, = 35C/W JMAX JC JA T = 100C, = 100C/W (N) T = 125C, = 100C/W JMAX JA JMAX JA LT1171CK: T = 100C, = 4C/W, = 35C/W JMAX JC JA T = 100C, = 120C/W to 150C/W JMAX JA LT1172MK: T = 150C, = 8C/W, = 35C/W JMAX JC JA depending on board layout (S) * Do not connect Pin 4 of the LT1172 DIP or SO to external LT1172CK: T = 100C, = 8C/W, = 35C/W JMAX JC JA circuitry. This pin may be active in future revisions. Based on continuous operation. * Do not connect Pin 4 of the LT1172 DIP or SO to external T = 125C for intermittent fault conditions. JMAX OBSOLETE circuitry. This pin may be active in future revisions. OBSOLETE TOP VIEW TAB IS NC 1 16 NC FRONT VIEW FRONT VIEW GND NC 2 15 NC 5 V IN 5 V IN 4 V SW GND 3 14 E2 TAB IS 4 V SW 3 GND GND V 4 13 V C SW 3 GND 2 FB 1 V FB 5 12 E1 C 2 FB NC 6 11 V 1 V Q PACKAGE IN C 5-LEAD DD NC 7 10 NC T PACKAGE T = 100C, = *C/W JMAX JA 5-LEAD PLASTIC TO-220 NC 8 9 NC LT1170CT/LT1170HVCT: T =100C, = 2C/W, = 75C/W JMAX JC JA * will vary from approximately 25C/W with 2.8 sq. LT1171CT/LT1171HVCT: T =100C, = 4C/W, = 75C/W SW PACKAGE JMAX JC JA in. of 1oz. copper to 45C/W with 0.20 sq. in. of 1oz. LT1172CT/LT1172HVCT: T =100C, = 8C/W, = 75C/W 16-LEAD PLASTIC SO WIDE JMAX JC JA copper. Somewhat lower values can be obtained with Based on continuous operation. additional copper layers in multilayer boards. T = 100C, = 150C/W JMAX JA T = 125C for intermittent fault conditions. JMAX Based on continuous operation. T = 125C for intermittent fault conditions. JMAX 117012fi 2 For more information www.linear.com/LT1170 ion igura on ings bsolu