TPS51285ARUKR Description

The TPS51285ARUKR is a cost-effective, dual synchronous buck controller with 5-V and 3.3-V LDOs, targeted for notebook system-power supply solutions. The TPS51285ARUKR achieves low power consumption by the use of auto-skip and ULQTM modes, which is beneficial for long battery life in system standby mode. The 256-kHz VCLK output is provided to drive an external charge pump, generating gate drive voltage for the load switches with minimum power consumption in the main converter. The TPS51285ARUKR employs adaptive on-time D-CAPTM mode control which enables fast load transient response without an external compensation network. The TPS51285ARUKR operates with supply input voltage ranging from 5V to 24V and supports output voltages of 5 V and 3.3 V. The TPS51285ARUKR is available in a 20-pin 3 x 3 (mm) QFN package and is specified from -40°C to 85°C.

TPS51285ARUKR Features

Input Voltage Range: 5 V to 24 V

Output Voltages: 5 V and 3.3 V (Adjustable Range +10%)

Built-in, 100-mA, 5-V, and 3.3-V LDOs

Clock Output for Charge-Pump

+1% Reference Accuracy

Adaptive On-Time D-CAPTM Mode Control

Architecture with 400 kHz (CH1) and 475 kH (CH2) Frequency

Auto-skip and ULQTM modes for long batter life in system standby mode

Internal 0.8-ms Voltage Servo Soft-Start

Low-Side Ros(on) Current Sensing Scheme

BuiltIn Output Discharge Function

Separate Enable Input for Switchers

Dedicated 0C Setting Terminals

Power Good Indicator

OVP, UVP, and OCP Protection

Non-L .atch UVLO and OTP Protection

20-Pin, 3 mm x 3 mm, QFN (RUK)

TPS51285ARUKR Applications

Notebook Computers

Tablet Computers

Automotive 

Body electronics & lighting 

Industrial 

Test & Measurement