RT8058

Preliminary

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DS8058-02 August 2007

www.richtek.com

Features

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0.6V Reference Allows Low Output Voltage

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Low Dropout Operation : 100% Duty Cycle

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2A Load Current

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< 2uA Shutdown Current

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Up to 95% Efficiency

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No Schottky Diode Required

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1MHZ Constant Switching Frequency

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Internally Compensated

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Internal Soft-Start

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Over temperature Protection

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Short Circuit Protection

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Small 16-Lead WQFN Package

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RoHS Compliant and 100% Lead (Pb)-Free

1MHz, 2A, High Efficiency PWM Step-Down DC/DC Converter

General Description

The RT8058 is a current mode PWM step-down converter.

The chip is ideal for fixed frequency and low ripple

applications over full range of load conditions. Its input

voltage range is from 2.6V to 5.5V with a constant 1MHz

switching frequency that allows it to adopt tiny, low cost

capacitors and inductors with 2mm or less in height making

it ideal for single-cell Li-lon/polymer battery applications.

The low on resistance internal MOSFET can achieve high

efficiency without the need of external schottky diodes in

wide operating ranges and the output voltage is adjustable

from 0.6V to 5V that can provide up to 2A load current.

The RT8058 operates at 100% duty cycle for low dropout

operation that extends battery life in portable devices.

The RT8058 is available in a WQFN-16L 3x3 package.

Applications

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Portable Instruments

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Microprocessors and DSP Core supplies

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Cellular Telephones

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Wireless and DSL Modems

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Digital Cameras

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PC Cards

Note :

Richtek Pb-free and Green products are :

ments of IPC/JEDEC J-STD-020.

Ordering Information

RT8058

Package Type

QW : WQFN-16L 3x3 (W-Type)

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

cial Standard)

Pin Configurations

(TOP VIEW)

WQFN-16L 3x3

12

11

10

9

13

14

15

16

1

2

3

4

8

7

6

5

FB

PGND

PGND

PGND

PVDD

PVDD

VDD

PVDD

PGND

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