1 Features
1• D-CAP2™ Mode Control
– Fast Transient Response
– No External Parts Required For Loop
Compensation
– Compatible with Ceramic Output Capacitors
• High Initial Reference Accuracy (±1%)
• Low Output Ripple
• Wide Input Voltage Range: 4.5 V to 24 V
• Output Voltage Range: 0.76 V to 5.5 V
• Low-Side RDS(on) Loss-Less Current Sensing
• Adaptive Gate Drivers with Integrated Boost Diode
• Internal 1.2 ms Voltage-Servo Soft Start
• Pre-Biased Soft Start
• Selectable Switching Frequency: 350 kHz / 700
kHz
• Cycle-by-Cycle Over-Current Limiting Control
• 30 mV to 300 mV OCP Threshold Voltage
• Thermally Compensated OCP by 4000 ppm/C° at
ITRIP

2 Applications
• Point-of-Load Regulation in Low Power Systems
for Wide Range of Applications
– Digital TV Power Supply
– Networking Home Terminal
– Digital Set Top Box (STB)
– DVD Player/Recorder
– Gaming Consoles and Other

3 Description
The TPS53126 is a dual, adaptive on-time, D-
CAP2™ mode synchronous Buck controller. The TPS53126 enables system designers to complete the
suite of various end equipment's power bus
regulators with a cost effective, low external
component count, and low standby current solution.
The main control loop for the TPS53126 uses the D- CAP2™ mode control which provides a very fast
transient response with no external components. The
TPS53126 also has a proprietary circuit that enables
the device to adapt to both low equivalent series resistance (ESR) output capacitors, such as
POSCAP or SP-CAP, and ultra-low ESR ceramic
capacitors. The device provides convenient and
efficient operation with input voltages from 4.5 V to 24
V and output voltages from 0.76 V to 5.5 V.
The TPS53126 is available in 4mm x 4mm 24 pin
VQFN (RGE) or 24 pin TSSOP (PW) packages and is specified from –40°C to 85°C ambient temperature
range.