General Description

The MAX8569A/MAX8569B low-quiescent-current

boost regulators provide up to 200mA at output volt-

ages up to 5.5V from a 1.5V to 5.5V input source. The

built-in synchronous rectifier allows for over 90% effi-

ciency while achieving small size and low cost by elimi-

nating the need for an external Schottky diode.

The MAX8569A provides an adjustable output while the

MAX8569B is fixed at 3.0V or 3.3V. The MAX8569B fea-

tures a power-on reset output (RST) to signal that the

output has reached regulation. All devices connect the

battery input to the output during shutdown, allowing

the input battery to be used as a backup or real-time

clock supply when the converter is off.

Applications

Features

o Over 200mA Available Output Current

o 1.5V to 5.5V Input Voltage Range

o BATT Connected to OUT in Shutdown for Backup

Power

o Up to 95% Efficiency

o 7µA Typical Quiescent Current

o <1µA Shutdown Supply Current

o Internal Synchronous Rectifier

o 750mA Switch Current Limit

o RST Output (MAX8569B)

o Adjustable Output Voltage (MAX8569A)

o Fixed 3.0V or 3.3V Output Voltage (MAX8569B)

200mA Step-Up Converters in 6-Pin

SOT23 and TDFN

________________________________________________________________ Maxim Integrated Products

1

MAX8569A

(MAX8569B)

TOP VIEW

6

5

4

12

3

TDFN

( ) ARE FOR THE MAX8569B

16

5

MAX8569A

(MAX8569B)

TOP VIEW

SOT23

2

34

FB (RST)

OUT

LX

SHDN

BATT

GND

+

+ DENOTES LEAD-FREE PACKAGING

Pin Configurations

Ordering Information

19-3671; Rev 0; 5/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION

KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX8569AEUT-T*

-40°C to +85°C

6 SOT23-6

(U6FH-6)

MAX8569AETT+

-40°C to +85°C

6 TDFN 3mm x 3mm

(T633-1)

MAX8569BEUT-T*

-40°C to +85°C

6 SOT23-6

(U6FH-6)

MAX8569BETT+

-40°C to +85°C

6 TDFN 3mm x 3mm

(T633-1)

MAX8569BETT30+

-40°C to +85°C

6 TDFN 3mm x 3mm

(T633-1)

Selector Guide appears at end of data sheet.

MAX8569B

RST

OUT

2V

INPUT

3.3V, 200mA

OUTPUT

POWER-ON

RESET

LX

OFF

ON

SHDN

BATT

GND

Typical Operating Circuit

Medical Diagnostic

Equipment

Digital Cameras

PDAs and Smartphones

Cordless Phones

Battery Backup

PC Cards

Local 3.3V or 5V Supply

+Denotes lead-free packaging.