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LTC3422 Datasheet(PDF) 10 Page - Linear Technology |
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LTC3422 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  LTC3422 10 3422fa OPERATIO BURST must be able to sink up to 4mA. Burst Mode operation is inhibited during soft-start. If VIN is greater than VOUT – 300mV, the part will exit Burst Mode operation and the synchronous rectifier will be disabled. Note that if the load current applied during forced Burst Mode operation (BURST is grounded) exceeds the current that can be supplied, the output voltage will start to droop and the LTC3422 will automatically come out of Burst Mode operation and enter fixed frequency mode, raising VOUT. Once regulation is achieved, the LTC3422 will then enter Burst Mode operation once again (since the user is still commanding this by grounding BURST ) and the cycle will repeat, resulting in about 4% output ripple. The maximum average current that can be supplied in Burst Mode operation is given by: I V V nmA OUT MAX IN OUT () • = 275 i Output Disconnect and Inrush Current Limiting The LTC3422 is designed to allow true output disconnect by eliminating body diode conduction of the internal P-channel MOSFET rectifier. This allows VOUT to go to zero volts during shutdown without drawing any current from 2mA 880mV TO 1.16V SSDONE 0 = PWM MODE 1 = Burst Mode OPERATION BURST COMP ERROR AMP/ SLEEP COMP UVLO COMP VCC BURST SLEEP CC1 CB RZ RB VC IOUT 10,000 VREF – 4% VREF ±1% – + – + COMP CLAMP 500mV TO 1V 7 BURST 3422 AI01 3 FB 6 Simplified Diagram of Automatic Burst Mode Control Circuit |
Similar Part No. - LTC3422 |
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Similar Description - LTC3422 |
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