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LTC1430C Datasheet(PDF) 1 Page - Linear Technology |
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LTC1430C Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC1430 High Power Step-Down Switching Regulator Controller The LTC ®1430 is a high power, high efficiency switching regulator controller optimized for 5V to 3.xV applications. It includes a precision internal reference and an internal feedback system that can provide output regulation of ±1% over temperature, load current and line voltage shifts. The LTC1430 uses a synchronous switching architecture with two N-channel output devices, eliminating the need for a high power, high cost P-channel device. Additionally, it senses output current across the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without an external low value sense resistor. The LTC1430 includes a fixed frequency PWM oscillator for low output ripple under virtually all operating conditions. The 200kHz free-running clock frequency can be externally adjusted from 100kHz to above 500kHz. The LTC1430 features low 350 µA quiescent current, allowing greater than 90% efficiency operation in converter designs from 1A to greater than 50A output current. Shutdown mode drops the LTC1430 supply current to 1 µA. s High Power 5V to 3.xV Switching Controller: Can Exceed 10A Output s All N-Channel External MOSFETs s Constant Frequency Operation—Small Inductor s Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations s High Efficiency: Over 95% Possible s Fixed Frequency Operation s No Low Value Sense Resistor Needed s Outputs Can Drive External FETs with Up to 10,000pF Gate Capacitance s Quiescent Current: 350 µA Typ, 1µA in Shutdown s Fast Transient Response s Adjustable or Fixed 3.3V Output s Available in 8- and 16-Lead PDIP and SO Packages , LTC and LT are registered trademarks of Linear Technology Corporation. LOAD CURRENT (A) 40 70 100 90 80 50 60 10 LTC1430 • TA02 0.1 1 TA = 25°C VIN = 5V VOUT = 3.3V Efficiency + CIN 220 µF ×4 COUT 330 µF ×6 + + + L1, 2.8 µH PVCC1 VCC FREQSET SHDN COMP SS PVCC2 PGND GND G1 IFB IMAX G2 NC LTC1430 • TA01 SHUTDOWN FB NC CIN: AVX-TPSE227M010R0100 COUT: AVX-TPSE337M006R0100 L1: ETQP6F1R6SFA M1A, M1B, M2: MOTOROLA MTD20N03HL SENSE+ LTC1430 SENSE– 16k 100 Ω RC 7.5k CC 4700pF C1 220pF 1N4148 1k 0.1 µF 1 µF 0.01 µF 0.1 µF 4.7 µF 0.1 µF 3.3V 10A M1A, M1B 2 IN PARALLEL M2 VIN 5V Typical 5V to 3.3V, 10A Application s Power Supply for P6 and Pentium ® Microprocessors s High Power 5V to 3.xV Regulators s Local Regulation for Dual Voltage Logic Boards s Low Voltage, High Current Battery Regulation Pentium is a registered trademark of Intel Corporation. APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO |
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