LTC1430 High Power Step-Down Switching Regulator Controller FEATURES DESCRIPTIO n High Power 5V to 3.xV Switching Controller: The LTC 1430 is a high power, high efficiency switching Can Exceed 10A Output regulator controller optimized for 5V to 3.xV applications. n All N-Channel External MOSFETs It includes a precision internal reference and an internal n Constant Frequency OperationSmall Inductor feedback system that can provide output regulation of 1% n Excellent Output Regulation: 1% Over Line, Load over temperature, load current and line voltage shifts. The and Temperature Variations LTC1430 uses a synchronous switching architecture with n High Efficiency: Over 95% Possible two N-channel output devices, eliminating the need for a n Fixed Frequency Operation high power, high cost P-channel device. Additionally, it n No Low Value Sense Resistor Needed senses output current across the drain-source resistance n Outputs Can Drive External FETs with Up to of the upper N-channel FET, providing an adjustable 10,000pF Gate Capacitance current limit without an external low value sense resistor. n Quiescent Current: 350m A Typ, 1m A in Shutdown The LTC1430 includes a fixed frequency PWM oscillator for n Fast Transient Response low output ripple under virtually all operating conditions. n Adjustable or Fixed 3.3V Output The 200kHz free-running clock frequency can be externally n Available in 8- and 16-Lead PDIP and SO Packages adjusted from 100kHz to above 500kHz. The LTC1430 features low 350m A quiescent current, allowing greater U APPLICATIO S than 90% efficiency operation in converter designs from 1A to greater than 50A output current. Shutdown mode n Power Supply for P6 and Pentium drops the LTC1430 supply current to 1m A. For new Microprocessors designs, refer to the LTC3830. n High Power 5V to 3.xV Regulators , LTC and LT are registered trademarks of Linear Technology Corporation. n Local Regulation for Dual Voltage Logic Boards Pentium is a registered trademark of Intel Corporation. n Low Voltage, High Current Battery Regulation TYPICAL APPLICATIO Typical 5V to 3.3V, 10A Application Efficiency 100 V 5V IN T = 25C A V = 5V IN + C 90 IN V = 3.3V 1N4148 OUT + 220m F 1m F 100W 4 80 16k 0.1m F PV PV CC2 CC1 M1A, M1B 2 IN PARALLEL V G1 + CC 70 0.1m F 4.7m F 0.1m F SS I L1, 2.8m H MAX 1k 0.01m F 3.3V LTC1430 I 60 FB 10A + C OUT NC FREQSET G2 M2 330m F 50 6 SHUTDOWN SHDN PGND COMP GND 40 C1 + 0.1 1 10 R 220pF SENSE C LTC1430 TA01 LOAD CURRENT (A) 7.5k FB NC C : AVX-TPSE227M010R0100 IN LTC1430 TA02 C C SENSE C : AVX-TPSE337M006R0100 OUT 4700pF L1: ETQP6F1R6SFA M1A, M1B, M2: MOTOROLA MTD20N03HL 1 EFFICIENCY (%) U ULTC1430 ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage Operating Temperature Range V ....................................................................... 9V LTC1430C .............................................. 0 C to 70 C CC PV .............................................................. 13V LTC1430I........................................... 40 C to 85 C CC1, 2 Input Voltage Storage Temperature Range ................ 65 C to 150 C I ......................................................... 0.3V to 18V Lead Temperature (Soldering, 10 sec)................. 300 C FB All Other Inputs ...................... 0.3V to (V + 0.3V) CC UUW PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER ORDER PART NUMBER 1 16 G2 G1 PART NUMBER TOP VIEW 2 15 PV PV CC1 CC2 G1 1 8 G2 LTC1430CN8 LTC1430CN 3 14 V PGND CC PV 2 7 V /PV CC1 CC CC2 LTC1430CS8 LTC1430CS 4 13 I GND FB GND 3 COMP 6 5 12 I LTC1430IS SENSE MAX FB 4 5 SHDN 6 11 FREQSET FB + 7 10 COMP SENSE N8 PACKAGE S8 PACKAGE S8 PART MARKING 8-LEAD PDIP 8-LEAD PLASTIC SO 8 9 SS SHDN N PACKAGE S PACKAGE T = 150 C, q = 100 C/W (N8) JMAX JA 1430 16-LEAD PDIP 16-LEAD PLASTIC SO T = 150 C, q = 150 C/W (S8) JMAX JA T = 150 C, q = 70 C/W (N) JMAX JA T = 150 C, q = 110 C/W (S) JMAX JA Consult factory for Industrial and Military grade parts. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 5V unless otherwise noted. (Note 2) A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Supply Voltage l48 V CC PV PV , PV l 13 V CC CC1 CC2 V Output Voltage Figure 1 l 3.30 V OUT + V Feedback Voltage Figure 1, SENSE and SENSE Floating (LTC1430C) l 1.25 1.265 1.28 V FB + Figure 1, SENSE and SENSE Floating (LTC1430I) l 1.23 1.265 1.29 V D V Output Load Regulation Figure 1, I = 0A to 10A (Note 3) (LTC1430C) l 520 mV OUT OUT Figure 1, I = 0A to 10A (Note 3) (LTC1430I) 5 mV OUT Output Line Regulation Figure 1, V = 4.75V to 5.25V (Note 3) (LTC1430C) l 15 mV CC Figure 1, V = 4.75V to 5.25V (Note 3) (LTC1430I) 1 mV CC IV Supply Current (V Only) Figure 2, V = V l 350 700 m A CC CC SHDN CC V = 0V 1 10 m A SHDN IPV Supply Current (PV ) Figure 2, PV = 5V, V = V (Note 4) 1.5 mA CC CC CC SHDN CC V = 0V 0.1 m A SHDN f Internal Oscillator Frequency FREQSET Floating (LTC1430C) l 140 200 260 kHz OSC FREQSET Floating (LTC1430I) l 130 200 300 kHz 2 U WWW