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LT1432CS8 Datasheet(PDF) 1 Page - Linear Technology |
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LT1432CS8 Datasheet(HTML) 1 Page - Linear Technology |
1 / 28 page 1 LT1432 5V High Efficiency Step-Down Switching Regulator Controller S FEATURE The LT1432 is a control chip designed to operate with the LT1170/LT1270 family of switching regulators to make a very high efficiency 5V step-down (buck) switching regula- tor. A minimum of external components is needed. Included is an accurate current limit which uses only 60mV sense voltage and uses “free” PC board trace material for the sense resistor. Logic controlled electronic shutdown mode draws only 15 µA battery current. The switching regulator operates down to 6V input. The LT1432 has a logic controlled “burst” mode to achieve high efficiency at very light load currents (0 to 100mA) such as memory keep-alive. In normal switching mode, the standby power loss is about 60mW, limiting efficiency at light loads. In burst mode, standby loss is reduced to approximately 15mW. Output current in this mode is typically in the 5mA to 100mA range. The LT1432 is available in 8-pin surface mount and DIP packages. The LT1170/LT1270 family will also be available in a surface mount version of the 5-pin TO-220 package. For 3.3V versions contact Linear Technology Corporation. DESCRIPTIO s Accurate Preset +5V Output s Up to 90% Efficiency s Optional Burst Mode for Light Loads s Can be Used with Many LTC Switching ICs s Accurate Ultra-Low-Loss Current Limit s Operates with Inputs from 6V to 30V s Shutdown Mode Draws Only 15 µA s Uses Small 50 µH Inductor S APPLICATI s Laptop and Palmtop Computers s Portable Data-Gathering Instruments s DC Bus Distribution Systems s Battery-Powered Digital Widgets 0 60 70 80 90 100 1A 2A 3A 20mA LT1432 TA02 40mA 60mA 0 NORMAL MODE (USE AMPS SCALE) BURST MODE (USE mA SCALE) LT1271, L = 50 µH Efficiency Figure 1. High Efficiency 5V Buck Converter APPLICATI TYPICAL + VSW FB GND VIN VC LT1170 LT1271 VC GND VIN MODE DIODE VOUT VLIM V+ + C1 330 µF 35V C6 0.02 µF C4 0.1 µF R1 680 Ω C5 0.03 µF D1 MBR330p C3 4.7 µF TANT D2 1N4148 L1 50 µH R2* 0.013 Ω C2 390 µF 16V VOUT 5V 3A** + × MODE LOGIC 220pF <0.3V = NORMAL MODE >2.5V = SHUTDOWN OPEN = BURST MODE * R2 IS MADE FROM PC BOARD COPPER TRACES. ** MAXIMUM CURRENT IS DETERMINED BY THE CHOICE OF LT1070 FAMILY. SEE APPLICATION SECTION. LT1432 VIN LT1432 TA01 OPTIONAL OUTPUT FILTER 100 µF 16V 10 µH 3A + |
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