MAX8834Y

更新时间： 2024-09-12 11:14:31

品牌	Logo	应用领域
美信 - MAXIM		驱动器转换器闪光灯
页数	文件大小	规格书
43页	1153K
描述
Adaptive Step-Up Converters with 1.5A Flash Driver

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MAX8834Y 数据手册

19-4421; Rev 0; 4/09

Adaptive Step-Up Converters

with 1.5A Flash Driver

Y/MAX834Z

General Description

Features

♦ 2.5V to 5.5V Operation Range

♦ Step-Up DC-DC Converter

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

1.5A Guaranteed Output Current

Adaptive or I C Programmable Output Voltage

2MHz and 4MHz Switching Frequency Options

♦ Two Flash/Movie LED Current Regulators

count. An I C interface provides flexible control of step-

I C Programmable Flash and Movie Current

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.

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

♦ LED Indicator Current Regulator

I C Programmable Output Current

Ramp and Blink Timers for Indicator Mode

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

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.

♦ I C Programmable Safety and Watchdog Timers

♦ GSM Blank Logic Input

♦ MAXFLASH System Lockup Protection

♦ Remote Temperature Sensor Input

♦ Open/Short LED Detection

♦ Thermal Shutdown Protection

♦ < 1µA Shutdown Current

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

Applications

Cell Phones and Smart Phones

PDAs, Digital Cameras, and Camcorders

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).

Typical Operating Circuit

1μH OR 2.2μH

PROGRAMMABLE

OUTPUT

INPUT

2.5V TO 5.5V

3.7V TO 5.2V

OUT

10μF

*Patent pending.

AGND

PGND

Ordering Information

COMP

FLED1

MAX8834Y

MAX8834Z

SWITCHING

TEMP

RANGE

1.5A TOTAL

FLASH

PART

PIN-PACKAGE FREQUENCY

(MHz)

FLED2

-40°C to 20 WLP

+85°C (2.5mm x 2.0mm)

MAX8834YEWP+T

MAX8834ZEWP+T

PA_TXON

GSMB

LED_EN

SCL

INDLED

16mA INDICATOR

FLASH ON

-40°C to 20 WLP

+85°C (2.5mm x 2.0mm)

FGND

NTC

I C

SDA

LOGIC

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

T = Tape and reel.

FINGER-BURN

PROTECTION

0.1μF

Pin Configuration appears at end of data sheet.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...43

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与MAX8834Y相关器件

型号	品牌	获取价格	描述	数据表
MAX8834YEWP+T	MAXIM	获取价格	Adaptive Step-Up Converters with 1.5A Flash Driver
MAX8834Z	MAXIM	获取价格	Adaptive Step-Up Converters with 1.5A Flash Driver
MAX8834ZEWP+T	MAXIM	获取价格	Adaptive Step-Up Converters with 1.5A Flash Driver
MAX8836Z	MAXIM	获取价格	1.2A PWM Step-Down Converter in 2mm x 2mm WLP/UCSP for PA Power
MAX8836ZEREEE+	MAXIM	获取价格	Switching Regulator
MAX8836ZEREEE+T	MAXIM	获取价格	1.2A PWM Step-Down Converter in 2mm x 2mm WLP/UCSP for PA Power
MAX8836ZEWEEE+T	MAXIM	获取价格	Switching Regulator, Voltage-mode, 1.2A, PBGA16, 2 X 2 MM, 0.70 MM HEIGHT, ROHS COMPLIANT,
MAX883C	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
MAX883C/D	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
MAX883CPA	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators

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