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LT1432-3.3 Datasheet(PDF) 1 Page - Linear Technology |
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LT1432-3.3 Datasheet(HTML) 1 Page - Linear Technology |
1 / 8 page 1 LT1432-3.3 3.3V High Efficiency Step-Down Switching Regulator Controller APPLICATI TYPICAL Figure 1. High Efficiency 5V Buck Converter S FEATURE The LT®1432-3.3 is a control chip designed to operate with the LT1171/LT1271 family of switching regulators to makeaveryhighefficiency3.3Vstep-down(buck)switch- ing regulator. 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 4.5V input. The LT1432-3.3 has a logic controlled Burst Mode operation to achieve high efficiency at very light load currents (0mA to 100mA) such as memory keep-alive. In normal switching mode, the standby power loss is about 30mW, limiting efficiency at light loads. In Burst Mode operation, standby loss is reduced to approximately 11mW. Output current in this mode is typically in the 5mA to 100mA range. The LT1432-3.3 is available in 8-pin SO and PDIP pack- ages. The LT1171/LT1271 is also available in surface mount DD packages. DESCRIPTIO I Accurate Preset 3.3V Output I Up to 87% Efficiency I Optional Burst ModeTM Operation for Light Loads I Can Be Used with Many LTC Switching ICs I Accurate Ultra-Low-Loss Current Limit I Operates with Inputs from 4.5V to 30V I Shutdown Mode Draws Only 15 µA I Uses Small 30 µH Inductor S APPLICATI I Laptop and Palmtop Computers I Portable Data-Gathering Instruments , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. + VSW FB GND VIN VC LT1271 + C1 330 µF 35V C6 0.02 µF C5† 0.03 µF D1 MBR330p C3 10 µF TANT D2** L1 30 µH R2* 0.013 Ω C2 390 µF 16V VOUT*** 3.3V 3A + × MODE LOGIC 220pF <0.3V = NORMAL MODE >2.5V = SHUTDOWN OPEN = Burst Mode OPERATION *R2 IS MADE FROM PC BOARD COPPER TRACES. **OPTIONAL CONNECTION FOR D2. EFFICIENCY IS HIGHER, BUT MINIMUM V IN INCREASES. SEE APPLICATION INFORMATION SECTION. ***MAXIMUM CURRENT IS DETERMINED BY THE CHOICE OF LT1071 FAMILY MAIN SWITCHER IC. SEE APPLICATION INFORMATION SECTION. VIN LT1432-3.3 TA01 OPTIONAL OUTPUT FILTER 100 µF 16V 10 µH 3A + VC GND MODE DIODE VOUT VLIM V+ LT1432-3.3 VIN D2 1N5818 FOR CIRCUITS WHICH DO NOT USE Burst Mode OPERATION, C5 MAY BE PARALLEL WITH A 680 Ω, 0.1µF IN SERIES TO GIVE WIDE PHASE MARGIN WITH DIFFERENT SWITCHING ICs AND OUTPUT CAPACITORS † 0 60 70 80 90 100 1A 2A 3A 20mA LT1432-3.3 TA02 40mA 60mA 0 Burst Mode OPERATION (USE mA SCALE) LT1271, L = 30 µH VIN = 7V D2 CONNECTED TO INPUT D2 CONNECTED TO OUTPUT Efficiency FOR INFORMATION PURPOSES ONLY OBSOLETE: Contact Linear Technology for Potential Replacement |
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