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LTC1530C Datasheet(PDF) 1 Page - Linear Technology |
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LTC1530C Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC1530 High Power Synchronous Switching Regulator Controller The LTC ®1530 is a high power synchronous switching regulator controller optimized for 5V to 1.3V-3.5V output applications. Its synchronous switching architecture drives two external N-channel MOSFET devices to provide high efficiency. The LTC1530 contains a precision trimmed reference and feedback system that provides worst-case output voltage regulation of ±2% over temperature, load current and line voltage shifts. Current limit circuitry senses the output current through the on-resistance of the topside N-channel MOSFET, providing an adjustable current limit without requiring an external low value sense resistor. The LTC1530 includes a fixed frequency PWM oscillator that free runs at 300kHz, providing greater than 90% efficiency in converter designs from 1A to 20A of output current. Shutdown mode drops the LTC1530 supply cur- rent to 45 µA. The LTC1530 is specified for commercial and industrial temperature ranges and is available in the S0-8 package. Figure 1. Single 5V to 3.3V Supply LOAD CURRENT (A) 0 0.3 100 90 80 70 60 50 40 30 20 10 0 4 8 10 1530 F01b 2 6 12 14 TA = 25°C Efficiency vs Load Current s High Power Buck Converter from 5V or 3.3V Main Power s Adjustable Current Limit in S0-8 with Topside FET RDS(ON) Sensing s No External Sense Resistor Required s Hiccup Mode Current Limit Protection s Adjustable, Fixed 1.9V, 2.5V, 2.8V and 3.3V Output s All N-Channel MOSFET Synchronous Driver s Excellent Output Regulation: ±2% over Line, Load and Temperature Variations s High Efficiency: Over 95% Possible s Fast Transient Response s Fixed 300kHz Frequency Operation s Internal Soft-Start Circuit s Quiescent Current: 1mA, 45 µA in Shutdown s Power Supply for Pentium ® II, AMD-K6®-2, SPARC, ALPHA and PA-RISC Microprocessors s High Power 5V to 1.3V-3.5V Regulators + + 2.7k 0.1 µF 10 µF + CO †† 330 µF × 7 CIN** 1200 µF × 4 LO † 2 µH MBR0530T1 MBR0530T1 20 Ω PVCC GND LTC1530-3.3 G1 COMP IFB IMAX G2 VOUT VOUT 3.3V 14A 1530 F01a VIN 5V * SILICONIX SUD50N03-10 ** SANYO 10MV1200GX COILTRONICS (561) 241-7876 RC 10k CC 0.022 µF 0.22 µF Q1* Q2* C1 150pF † COILTRONICS CTX02-13198 OR PANASONIC ETQP6F2R5HA †† AVX TPSE337M006R0100 , LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corp. AMD-K6 is a registered trademark of Advanced Micro Devices, Inc. DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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