AME5138AEEVADJY datasheet, PDF

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AME5138AEEVADJY: DescriptionMicropower Step-Up DC/DC Converter; CategoryPower/power management The power supply circuit; File Size532KB，16 Pages; ManufacturerAnalogMicroElectronics,Inc.(AME); AMT was founded in Taiwan in November 2000 and merged into AMT Microelectronics, Inc., a US company located in Silicon Valley, California, USA. Its stock was officially listed for public trading in March 2004.

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AME5138AEEVADJY Overview

Micropower Step-Up DC/DC Converter

AME5138AEEVADJY Parametric

Parameter Name	Attribute value
Maker	AnalogMicroElectronics,Inc.(AME)
package instruction	,
Reach Compliance Code	compli

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AME, Inc.

AME5138

General Description

The AME5138 is a fixed off-time step-up DC/DC con-

verter in a small 5-lead SOT-25 package.The AME5138

is ideal for LCD panels requiring low current and high effi-

ciency as well as LED applications for cellular phone back-

lighting, PDAs,and other hand-held devices. The low 400ns

off-time allows the use of tiny external components.

AME5138 is designed to drive up to four white LEDs

in series with a constant current from a single Li-lon bat-

tery. To control LED brightness, the LED current can be

adjusted by applying a PWM (pulse width modulated)

signal with a frequency range of 100Hz to 50KHz to the

EN pin.

Micropower Step-Up

DC/DC Converter

Typical Application

2.5V-4.2V

10µH

LED

OUT

1µF

Ceramic

Option for

4LEDs

4.7µF

Ceramic

AME5138

>1.1V 4

GND

80Ω

* I

LED

/R2

Features

0.7Ω internal switch

Uses small surface mount components

Adjustable output voltage up to 20V

2V to 5.5V input range

Input undervoltage lockout

0.01µA shutdown current

Small 5-Lead SOT-25 package

All AME's lead free Product Meet RoHS

Standard

Figure 1

：

Four White LEDs Application in Li-lon

Battery

2.5V-4.2V

15µH

20V

10mA

4.7µF

Ceramic

200K

AME5138

GND

13K

OUT

1µF

Ceramic

Applications

White LED Back-Lighting

Hand-held Devices

Digital Cameras

Portable Applications

LCD Bias Power

Figure 2

：

Typical 20V Application

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