TPS54426PWPRG4中文资料德州仪器数据手册PDF规格书

1FEATURES

23• D-CAP2™ Mode Enables Fast Transient

Response

• Low Output Ripple and Allows Ceramic Output

Capacitor

• Wide VIN Input Voltage Range: 4.5 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

– 65 mΩ (High Side) and 55 mΩ (Low Side)

• High Efficiency, less than 10 μA at shutdown

• High Initial Bandgap Reference Accuracy

• Adjustable Soft Start

• Pre-Biased Soft Start

• 700-kHz Switching Frequency (f SW)

• Cycle By Cycle Over Current Limit

• Power Good Output

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

Light Load

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 TPS54426 is an adaptive on-time D-CAP2™

mode synchronous buck converter. The TPS54426

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

TPS54426 uses the D-CAP2™ mode control which

provides a very fast transient response with no

external compensation components. The adaptive

on-time control supports seamless transition between

PWM mode at higher load conditions and

Eco-mode™ operation at light loads. Eco-mode™

allows the TPS54426 to maintain high efficiency during lighter load conditions. The TPS54426 also

has a proprietary circuit that enables the device to

adopt to both low equivalent series resistance (ESR)

output capacitors, such as POSCAP, SP-CAP, and

ultra-low ESR ceramic capacitors. The device

operates from 4.5-V to 18-V VIN input. The output

voltage can be programmed between 0.76 V and 5.5

V. The device also features an adjustable soft start

time and a power good function. The TPS54426 is

available in the 14-pin HTSSOP package and the 16

pin QFN package, designed to operate from –40°C to 85°C.