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General Description

The RT5760 is a simple, easy-to-use, 1A synchronous

step-down DC-DC converter with an input supply

voltage range of 2.5V to 6V. The device build-in an

accurate 0.6V reference voltage and integrates low

RDS(ON) power MOSFETs to achieve high efficiency in

a SOT-563 (FC) package.

The RT5760 adopts Advanced Constant On-Time

(ACOTTM) control architecture to provide an ultrafast

transient response with few external components and

to operate in nearly constant switching frequency over

the line, load, and output voltage range. The RT5760A

operates in automatic PSM that maintains high

efficiency during light load operation. The RT5760B

operates in Forced PWM that helps meet tight voltage

regulation accuracy requirements. The RT5760C/D

remove the power good indicator function of the

RT5760A/B for different application.

The RT5760 senses both FETs current for a robust

over-current protection. The device features

cycle-by-cycle current limit protection and prevent the

device from the catastrophic damage in output short

circuit, over current or inductor saturation. A built-in

soft-start function prevents inrush current during

start-up. The device also includes input under-voltage

lockout, output under-voltage protection, and

over-temperature protection (thermal shutdown) to

provide safe and smooth operation in all operating

conditions.

Features

? Input Voltage Range of 2.5V to 6V

? Integrated 120m? and 80m? FETs

? 1A Output Current, up to 95 Efficiency

? 100 Duty Cycle for Lowest Dropout

? 0.6V, 1 Internal Reference Voltage

? 2.2MHz Typical Switching Frequency

? Power Saving Mode for Light Loads (RT5760A/C)

? Low Shutdown Current ? 1?A

? Low Quiescent Current: 25?A (Typ.)

? Fast Advanced Constant On-Time (ACOTTM

Control

? Internal Soft Startup (0.6ms)

? Independent Enable Control Input

? Power Good Indicator

? Both FETs Over-Current Protection

? Input Under-Voltage Lockout Protection

? Hiccup-Mode Output Under-Voltage Protection

? Over-Temperature Protection (Thermal Shutdown)

? RoHS Compliant and Halogen Free

Applications

? Mobile Phones and Handheld Devices

? STB, Cable Modem, and xDSL Platforms

? WLAN ASIC Power / Storage (SSD and HDD)

? General Purpose for POL LV Buck Converter