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.