Analog Devices LTC3777 is a buck-boost switching regulator controller. This device operates from input voltages above, below, or equal to the output voltage. The constant frequency current mode architecture allows a phase-lockable frequency of up to 600 kHz, while an input/output constant current loop provides support for battery charging. The 150 V integrated switching bias supply is a high-efficiency step-down regulator that draws only 12 μA typical DC supply current with a regulated output voltage at no load.
The LTC3777 features a power good output indicator and a MODE pin to select between pulse-skipping mode or forced continuous mode of operation. The PLLIN pin allows the IC to be synchronized to an external clock. The SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short circuit
conditions. With a 4.5 V to 150 V input and output range and seamless transfers between operating regions, the LTC3777 is ideal for industrial, telecom, and battery-powered
systems.
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| Features |
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- Buck-boost, step up/step down
- Wide VIN range: 4.5 V to 150 V
- Wide output voltage range: 1.2 V ≤ VOUT ≤ 150 V
- Synchronous rectification: Up to 99% efficiency
- ±1% 1.2 V voltage reference
- Input or output average current limit
- 150 V rated RUN pin with accurate turn-on threshold
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- Integrated 12 μA IQ, 150 V, 85 mA, switching bias for optimal thermal performance
- Programmable 6 V to 10 V DRVCC optimizes efficiency
- No top FET refresh noise in boost or buck mode
- VOUT disconnected from VIN during shutdown
- Phase-lockable fixed frequency (50 kHz to 600 kHz)
- No reverse current during start-up
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| Applications |
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- Transportation
- Industrial
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Analog Devices LTC3777 is a buck-boost switching regulator controller. This device operates from input voltages above, below, or equal to the output voltage. The constant frequency current mode architecture allows a phase-lockable frequency of up to 600 kHz, while an input/output constant current loop provides support for battery charging. The 150 V integrated switching bias supply is a high-efficiency step-down regulator that draws only 12 μA typical DC supply current with a regulated output voltage at no load.
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