LTC7801EFE#PBF

芯片, 直流/直流控制器, 同步降压, 900KHZ, QFN-28

The from is a 150V, low IQ, synchronous step-down DC to DC controller in 24 pin TSSOP package. This high performance step-down switching regulator DC to DC controller drives an all N-channel synchronous power MOSFET stage that can operate from input voltages up to 140V. Constant frequency current mode architecture allows a phase-lockable frequency of up to 850KHz. The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard level FETs to maximize efficiency. An integrated switch in the top gate driver eliminates the need for an external bootstrap diode. The low 40µA no-load quiescent current extends operating run time in battery powered systems. OPTI-LOOP® compensation allows transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7801 features a precision 0.8V reference. It is used in high voltage battery operated systems and telecommunications power systems.

.

Wide VIN range from 4V to 140V 150V absolute maximum

.

Output voltage can be programmed between 0.8V to 60V using external resistors

.

5V to 10V OPTI-DRIVE adjustable gate drive level, feedback current is -0.006µA

.

40µA low operating IQ shutdown = 10µA, internal charge pump allows for 100% duty cycle operation

.

Selectable gate drive UVLO thresholds, no external bootstrap diode required

.

EXTVCC LDO powers drivers from VOUT and onboard LDO or external NMOS LDO for DRVCC

.

Phase lockable frequency 75KHz to 850KHz, programmable fixed frequency 50KHz to 900KHz

.

Burst mode operation at light loads, selectable continuous, pulse-skipping or low ripple

.

Adjustable burst clamp, power good output voltage monitor, programmable input overvoltage lockout

.

Power good output indicator, operating temperature range from -40°C to 125°C