LM251772中文資料德州儀器數(shù)據(jù)手冊PDF規(guī)格書

1 Features

? Input range from 3.5V to 36V

? Dynamical Vo programming via I2C from:

– 3.3V up to 48V in 20mV steps

– 1V up to 24V in 10mV steps

? Peak current regulation control

? Small voltage transition ripple over all operating

modes

? Shut down quiescent current 3μA

? Operating quiescent current 60μA

? Drive (DRV) pin for dual role port power path

– Push-Pull output for fast pMOS FET control

– Configurable as charge pump driver stage for

nMOS FET

? Operation mode selection for high efficiency in light

load and high load conditions:

– Power save mode (Single Pulse/μSleep)

– Automatic conduction mode

? Integrated high voltage supply LDO

? Auxiliary high voltage LDO for PD-controller supply

? Integrated full-bridge gate drive

– 2A peak current capability

– Bootstrap over and under-voltage protection

– Integrated boot-strap diode

? Fixed frequency independent from operating mode

(boost, buck-boost, buck)

– Forced PWM mode selectable

– Switching frequency from 100kHz to 600kHz

– External clock synchronization and clock output

? Average input or output current sensor

– Programmable from 0.5A to 7A in 50mA steps

– ISET pin selectable

? I2C Interface readout of monitoring features

? Commercial temperature range (Tj = 0°C to 70°C)

? Create a custom design using the LM251772 with

the WEBENCH? Power Designer

2 Applications

? USB Type-C power delivery sourcing:

– Docking station

– PC-monitor

– Industrial PC/ Rugged PC

– USB AC/DC adapter

? Wireless charging

3 Description

The LM251772 is a four switch Buck-Boost controller.

It provides a regulated output voltage if the input

voltage is higher, equal or lower than the adjusted

output voltage. In power save mode the device

supports very high efficiency over the complete

operation range of the output. The output voltage and

average current can be dynamically programmed via

the integrated I2C interface. The configuration range

for output voltage and average current meet the USBPD

standard requirements. The integrated DRV pin

can control a disconnect FET to support dual role port

(DRP) requirements.