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LTC3440 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3440 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  LTC3532 6 3532fc BLOCK DIAGRA PI FU CTIO S SHDN/SS (Pin 8): Combined Soft-Start and Shutdown. Grounding this pin shuts down the IC. Tie to >1.5V to enable the IC and >2.4V to ensure the error amp is not clamped from soft-start. For Burst Mode operation, this pin must be pulled up to within 0.5V of VIN. An RC from the shutdown command signal to this pin will provide a soft- start function by limiting the rise time of the VC pin. FB (Pin 9): Feedback Pin. Connect resistor divider tap here. The output voltage can be adjusted from 2.4V to 5.25V. The feedback reference is typically 1.22V. Set VOUT according to the formula: VOUT = 1.22V • R1+ R2 () R2 VC (Pin10): Error Amp Output: A frequency compensa- tion network is connected from this pin to the FB pin to compensate the loop. Refer to the Applications Information section for component value selection. Exposed Pad (Pin11): The exposed pad (DFN Package) must be soldered to PCB ground for electrical contact and rated thermal performance. – + – + – + – + 7 PWM LOGIC GATE DRIVERS AND ANTICROSS CONDUCTION GND UVLO 1.1A 2.3V OSC PEAK CURRENT LIMIT SW A SW1 VIN VCC VIN VIN SW2 SW D ERROR AMP 1.22V REVERSE AMP SW B SW C 5 3 4 VOUT 6 FB 9 BURST 2 VC 10 8 SHDN/SS 1 RT 3532 BD PWM COMP THERMAL SHUTDOWN SHUTDOWN SOFT-START SHUTDOWN 1.22V VREF AUTOMATIC Burst Mode CONTROL AND VC HOLD gm = 1/60k 1A VREF SLEEP SS |
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Similar Description - LTC3440 |
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