1FEATURES

23• D-CAP2™ Mode Enables Fast Transient

Response

• Low Output Ripple and Allows Ceramic Output

Capacitor

• Wide VCC Input Voltage Range: 4.5 V to 18 V

• Wide V IN Input Voltage Range: 2 V to 18 V

• Output Voltage Range: 0.76 V to 5.5 V

• Highly Efficient Integrated FET’s Optimized

for Lower Duty Cycle Applications

- 120 mΩ (High Side) and 70 mΩ (Low Side)

• High Efficiency, less than 10 μA at Shutdown

• Auto-Skip Eco-mode™ for High Efficiency at

Light Load

• High Initial Bandgap Reference Accuracy

• Adjustable Soft Start

• Pre-Biased Soft Start

• 700-kHz Switching Frequency (fSW)

• Cycle-By-Cycle Overcurrent Limit

• Power Good Output

APPLICATIONS

• Wide Range of Applications for Low Voltage

System

– Digital TV Power Supply

– High Definition Blu-ray Disc™ Players

– Networking Home Terminal

– Digital Set Top Box (STB)

DESCRIPTION

The TPS54326 is an adaptive on-time D-CAP2™

mode synchronous buck converter. The TPS54326

enables system designers to complete the suite of

various end equipment’s power bus regulators with a

cost effective, low component count, low standby

current solution. The main control loop for the

TPS54326 uses the D-CAP2™ mode control which

provides a fast transient response with no external

components. The adoptive on-time control supports

seamless operation between PWM mode at heavy

load condition and reduced frequency Eco-mode™

operation at light load for high efficiency.

The TPS54326 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 operates from 4.5-V to 18-V

VCC input , and from 2-V to 18-V VIN input power

supply voltage. The output voltage can be

programmed between 0.76 V and 5.5 V. The device

also features an adjustable slow start time and a

power good function. The TPS54326 is available in

the 14 pin HTSSOP or 16 pin QFN package, and

designed to operate from –40°C to 85°C.