Datasheet Texas Instruments TPS65257RHAR — 数据表

TPS65257
www.ti.com SLVSB32A – SEPTEMBER 2011 – REVISED DECEMBER 2012 4.5-V TO 16-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN THREE DC-DC
CONVERTER WITH INTEGRATED FET, USB SWITCH AND PUSH BUTTON CONTROL
Check for Samples: TPS65257 FEATURES 1 Wide Input Supply Voltage Range:
4.5 V -16 V
0.8-V, 1% Accuracy Reference
Continuous Loading:
3 A (Buck1), 2 A (Buck2 and 3)
Maximum Current:
3.5 A (Buck 1), 2.5 A (Buck2 and 3)
Synchronous Operation, 300-kHz – 2.2-MHz
Switching Frequency Set By External Resistor
External Enable Pins With Built-In Current
Source for Easy Sequencing
External Soft Start Pins
Adjustable Cycle-by-Cycle Current Limit Set
by External Resistor
Current-Mode Control With Simple
Compensation Circuit Automatic Low Pulse Skipping (PSM) Power
Mode, Allowing for an Output Ripple Better
than 2%
Support Pre-Biased Outputs
Power Good Supervisor and Reset Generator …