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MAX8834Y

Adaptive Step-Up Converters with 1.5A Flash Driver

Maxim Integrated 

EVALUATION KIT AVAILABLE

MAX8834Y/MAX8834Z

Adaptive Step-Up Converters

with 1.5A Flash Driver

General Description

The MAX8834Y/MAX8834Z flash drivers integrate a

1.5A PWM DC-DC step-up converter and three pro-

grammable low-side, low-dropout LED current regula-

tors. The step-up converter features an internal

switching MOSFET and synchronous rectifier to

improve efficiency and minimize external component

count. An I2C interface provides flexible control of step-

up converter output voltage setting, movie/flash mode

selection, flash timer duration settings, and current reg-

ulator settings. The MAX8834Y/MAX8834Z operate

down to 2.5V, making them future proof for new battery

technologies.

The MAX8834Y/MAX8834Z consist of two current regula-

tors for the flash/movie mode. Each current regulator can

sink 750mA in flash mode and 125mA in movie mode.

The MAX8834Y/MAX8834Z also integrate a 16mA low-

current regulator that can be used to indicate camera

status. The indicator current regulator includes program-

mable ramp and blink timer settings. A programmable

input current limit, invoked using the GSMB control,

reduces the total current drawn from the battery during

PA transmit events. This ensures the flash current is set

to the maximum possible for any given operating condi-

tion. Additionally, the MAX8834Y/MAX8834Z include a

MAXFLASH function that adaptively reduces flash cur-

rent during low battery conditions to help prevent system

undervoltage lockup.

Other features include an optional NTC input for finger-

burn protection and open/short LED detection. The

MAX8834Y switches at 2MHz, providing best overall

efficiency. The MAX8834Z switches at 4MHz, providing

smallest overall solution size. The MAX8834Y/

MAX8834Z are available in a 20-bump, 0.5mm pitch

WLP package (2.5mm x 2.0mm).

Ordering Information

PART

TEMP

RANGE

PIN-PACKAGE

SWITCHING

FREQUENCY

(MHz)

MAX8834YEWP+T -40°C to 20 WLP

2

+85°C (2.5mm x 2.0mm)

MAX8834ZEWP+T

-40°C to

+85°C

20 WLP

(2.5mm x 2.0mm)

4

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Pin Configuration appears at end of data sheet.

Visit www.maximintegrated.com/products/patents for

product patent marking information.

Features

o 2.5V to 5.5V Operation Range

o Step-Up DC-DC Converter

1.5A Guaranteed Output Current

Adaptive or I2C Programmable Output Voltage

2MHz and 4MHz Switching Frequency Options

o Two Flash/Movie LED Current Regulators

I2C Programmable Flash and Movie Current

Low-Dropout Voltage (110mV max) at 500mA

o LED Indicator Current Regulator

I2C Programmable Output Current

Ramp and Blink Timers for Indicator Mode

Low-Dropout Voltage (130mV max) at 16mA

o I2C Programmable Safety and Watchdog Timers

o GSM Blank Logic Input

o MAXFLASH System Lockup Protection

o Remote Temperature Sensor Input

o Open/Short LED Detection

o Thermal Shutdown Protection

o < 1µA Shutdown Current

o 20-Bump, 0.5mm Pitch, 2.5mm x 2.0mm WLP

Applications

Cell Phones and Smart Phones

PDAs, Digital Cameras, and Camcorders

Typical Operating Circuit

INPUT

2.5V TO 5.5V

10µF

1µH OR 2.2µH

LX

IN

AGND

PGND

COMP

MAX8834Y

MAX8834Z

PROGRAMMABLE

OUTPUT

3.7V TO 5.2V

OUT

10µF

FLED1

FLED2

1.5A TOTAL

FLASH

PA_TXON

FLASH ON

I2C

VLOGIC

0.1µF

GSMB

LED_EN

SCL

SDA

VDD

INDLED

FGND

16mA INDICATOR

NTC

FINGER-BURN

PROTECTION

For pricing, delivery, and ordering information, please contact Maxim Direct

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

19-4421; Rev 2; 2/10

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