1FEATURES

2• High Efficiency, Low-Power Consumption,

Shutdowns to <1 mA

• Fixed Frequency Emulated On-Time Control,

Frequency Selectable From Three Options

• D-CAP™ Mode Enables Fast Transient

Response

• Auto-Skip Mode

• Less Than 1% Initial Reference Accuracy

• Low Output Ripple

• Wide Input Voltage Range: 3 V to 28 V

• Output Voltage Range: 0.76 V to 5.5 V

• Low-Side R DS(on) Loss-less Current Sensing

• Adaptive Gate Drivers With Integrated Boost

Diode

• Internal 1.2-ms Voltage-Servo Soft Start

• Power-Good Signals for Each Channel With

Delay Timer

• Output Discharge During Disable, Fault

APPLICATIONS

• I/O and Low Voltage System Bus in Embedded

Computing Systems

DESCRIPTION

The TPS59124 is a dual, adaptive on-time D-CAP™

mode synchronous buck controller. This device

enables system designers to cost effectively complete

the suite of embedded computer power bus regulators with the absolute lowest external

component count and lowest standby consumption.

The fixed-frequency emulated adaptive on-time

control supports seamless operation between PWM

mode at heavy load condition and reduced frequency operation at light load for high-efficiency down to

milliampere range. The main control loop for the

TPS59124 uses the D-CAP mode that optimized for

low-ESR output capacitors such as POSCAP or

SP-CAP promises fast transient response with no

external compensation. Simple and separate power

good signals for each channel allow flexibility of

power sequencing. The device provides convenient

and efficient operation with supply input voltages

(V5IN, V5FILT) ranging from 4.5 V to 5.5 V, conversion voltages (drain voltage for the

synchronous high-side MOSFET) from 3 V to 28 V

and output voltages from 0.76 V to 5.5 V.

The TPS59124 is available in 24-pin QFN package

specified from –40°C to 85°C ambient temperature

range.