TPS51285ARUKT Description

The TPS51285ARUKT is a cost-effective, dual synchronous buck controller with 5-V and 3.3-V LDOs， targeted for notebook system-power supply solutions. The TPS51285ARUKT 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 TPS51285ARUKT employs adaptive on-time D-CAPTM mode control which enables fast load transient response without an external compensation network. The TTPS51285ARUKT is available in a 20-pin 3 x 3 (mm) QFN package and is specified from -40°C to 85°C.

TPS51285ARUKT 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 kHz(CH2) Frequency

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

Internal 0.8-ms Voltage Servo Soft Start

Low-Side Rps(on) Current Sensing Scheme

Built-In Output Discharge Function

Separate Enable Input for Switchers

Dedicated OC 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)

TPS51285ARUKT Applications

Notebook Computers

Tablet Computers

Communications equipment 

Wireless infrastructure 

Industrial 

Factory automation & control 

Personal electronics 

PC & notebooks