LTC7811

40V, Low I_Q, 3MHz, Triple Output Buck/Buck/Boost Controller

英文数据手册

Rev. 0

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优势和特点
产品详情

优势和特点

Dual Synchronous Buck Plus Single Boost Controllers
Low Operating I_Q:
- 14μA (14V to 3.3V, Channel 1 On)
Outputs Remain in Regulation Through Cold Crank Down to 1V Input Supply Voltage
Wide Bias Input Voltage Range: 4.5V to 40V
Buck Output Voltages Up to 40V
Boost Output Voltage Limited Only by External Components
Spread Spectrum Operation

R_SENSE or DCR Current Sensing
Low Battery Indicator for Automotive Applications
Programmable Fixed Frequency (100kHz to 3MHz)
Phase-Lockable Frequency (100kHz to 3MHz)
Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode^® Operation at Light Loads
Boost Channel Current Monitor Output
Low Shutdown I_Q: 1.5μA
Small 40-Lead 6mm × 6mm QFN Package
AEC-Q100 Automotive Qualification in Progress

产品详情

The LTC7811 is a high performance triple output (buck/buck/boost) DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Its constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7811 operates from a wide 4.5V to 40V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC7811 can operate from an input supply as low as 1V after start-up.

The very low no-load quiescent current extends operating run time in battery powered systems. OPTI-LOOP^® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7811 features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator.

The LTC7811 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.

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