MAX8969EWL53 データシートの表示（PDF） - Maxim Integrated

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MAX8969EWL53

Step-Up Converter for Handheld Applications

Maxim Integrated 

MAX8969

Step-Up Converter for Handheld Applications

General Description

The MAX8969 is a simple 1A step-up converter in a small

package that operates in any single-cell Li-ion application.

This IC provides protection features such as input undervolt-

age lockout, short circuit, and overtemperature shutdown.

The IC transitions to skip mode seamlessly under light-

load conditions to improve efficiency. Under these condi-

tions, switching occurs only as needed, reducing switching

frequency and supply current to maintain high efficiency.

For higher efficiency when input voltage is closer to the

output voltage, two special modes of operation are avail-

able: track and automatic track. These modes allow users

to balance quiescent current (IQ) vs. transient response

time into boost mode. In both modes, the p-channel

MOSFET acts as a current-limited switch such that VOUT

follows VIN. However, in track mode, the boost circuits

are disabled and the system controls the boost func-

tion with the EN, TREN inputs (IQ = 30µA). In automatic

track mode (ATM), the boost circuits are enabled and the

device automatically transitions into boost mode when

VIN falls to 95% of the target VOUT (IQ = 60µA).

The IC is available in a small, 1.25mm x 1.25mm, 9-bump

WLP (0.4mm pitch) package.

Applications

●● Cell Phones

●● Smartphones

●● Mobile Internet Devices

●● GPS, PND

●● eBooks

Ordering Information appears at end of data sheet.

True Shutdown is a trademark of Maxim Integrated Products, Inc.

Benefits and Features

●● Flexible System Integration

• Up to 1A Output Current

• 2.5V to 5.5V Input Voltage Range

• 3.3V to 5.5V Output Voltage Options

●● Integrated Protection Increases System Robustness

• Undervoltage Lockout (UVLO)

• Short-Circuit Protection

• Overtemperature Shutdown

●● High Efficiency and Low Quiescent Current Extends

Battery Life

• Over 90% Efficiency with Internal Synchronous

Rectifier

• 60µA IQ in Automatic Track Mode

• 45µA IQ in Step-Up Mode

• 30µA IQ in Track Mode

• 1µA Shutdown Current

• Skip Mode Under Light Load Condition Improves

Efficiency

• True Shutdown™ Prevents Current Flow from

OUT_ to LX_

• Soft-Start Limits Inrush Current to 480mA

●● Small Package and High Frequency Operation

Reduce Board Space

• 9-Bump 1.25mm x 1.25mm WLP Package

• 3MHz PWM Switching Frequency

• Small External Components

Typical Operating Circuit

L1

1µH

INPUT

2.5V TO 5.5V

CIN

4.7µF

IN

LX_

OUT_

MAX8969

EN

TREN

GND_

OUTPUT

3.7V, 1A

COUT

22µF

19-6038; Rev 7; 4/20

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