MAX8645XETI

更新时间： 2024-11-18 03:04:51

品牌	Logo	应用领域
美信 - MAXIM		泵
页数	文件大小	规格书
15页	311K
描述
1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN

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MAX8645XETI 数据手册

19-3978; Rev 3; 12/06

1x/1.5x/2x White LED Charge Pumps with

Two LDOs in 4mm x 4mm TQFN

General Description

Features

The MAX8645X/MAX8645Y charge pumps drive up to

eight white LEDs with regulated constant current for uni-

form intensity. The main group of LEDs (M1–M6) can be

driven up to 30mA per LED for backlighting. The flash

group of LEDs (F1 and F2) is independently controlled

and can be driven up to 200mA per LED (or 400mA total).

Two 200mA LDOs are on-board to provide power for

camera functions. The LDOs’ output voltages are pin pro-

grammable to meet different camera-module require-

ments. The MAX8645X and MAX8645Y differ only in LDO

output voltages. By utilizing adaptive 1x/1.5x/2x charge-

pump modes and very-low-dropout current regulators,

the MAX8645X/MAX8645Y achieve high efficiency over

the full 1-cell lithium-battery voltage range. The 1MHz

fixed-frequency switching allows for tiny external compo-

nents, and the regulation scheme is optimized to ensure

low EMI and low input ripple.

♦ Power Up to Eight LEDs

Up to 30mA/LED Drive for Backlight

Up to 400mA Total Drive for Flash

♦ Two Internal Low-Noise 200mA LDOs

♦ 94% Max/85% Avg Efficiency (P

) over Li+

LED BATT

Battery Discharge

♦ 0.2% Typical LED Current Matching

♦ Adaptive 1x/1.5x/2x Mode Switchover

♦ Flexible Brightness Control

Single-Wire, Serial-Pulse Interface (32 Steps)

2-Bit Logic (Three Levels)

♦ Thermal T Derating Function

The MAX8645X/MAX8645Y are available in a 28-pin TQFN,

4mm x 4mm (0.8mm max height) lead-free package.

♦ Low Input Ripple and EMI

♦ 2.7V to 5.5V Supply Voltage Range

Applications

Camera Phones and Smartphones

Backlighting and Flash

♦ Soft-Start, Overvoltage, and Thermal-Shutdown

Protection

♦ 28-Pin TQFN, 4mm x 4mm Package

PDAs, Digital Cameras, and Camcorders

Typical Operating Circuit

Ordering Information

1μF

PIN-

PACKAGE

PKG

CODE

PART

TEMP RANGE

OUTPUT

UP TO 580mA

INPUT

2.7V TO 5.5V

C1P

C1N

C2P

C2N

OUT

28 TQFN-EP

4mm x 4mm

MAX8645XETI+ -40°C to +85°C

MAX8645YETI+ -40°C to +85°C

T2844-1

MAIN

FLASH

10μF

MAX8645X

MAX8645Y

28 TQFN-EP

4mm x 4mm

GND

PGND

EP = Exposed paddle.

+Denotes a lead-free package.

ENM1

ENM2

MAIN ON/OFF

AND DIMMING

ENF

FLASH ON/OFF

LDO1

LDO2

ENLDO

DUAL-LDO ON/OFF

CAMERA

MODULE

DUAL-LDO

VOLTAGE

1μF

SELECTION

SETM

SETF

REF

Pin Configuration appears at end of data sheet.

0.01μF

________________________________________________________________ Maxim Integrated Products

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.

12 3 4 5 6 7...15

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与MAX8645XETI相关器件

型号	品牌	获取价格	描述	数据表
MAX8645XETI+	MAXIM	获取价格	暂无描述
MAX8645XETI+T	MAXIM	获取价格	LED Driver, 8-Segment, BICMOS, 4 X 4 MM, 0.40 MM PITCH, ROHS COMPLIANT, TQFN-28
MAX8645YETI	MAXIM	获取价格	1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN
MAX8646	MAXIM	获取价格	6A, 2MHz Step-Down Regulator with Integrated Switches
MAX8646	ADI	获取价格	6A、2MHz、降压型调节器，内置开关
MAX8646ETG+	MAXIM	获取价格	6A, 2MHz Step-Down Regulator with Integrated Switches
MAX8646ETG+T	MAXIM	获取价格	Switching Regulator, Voltage-mode, 11A, 2000kHz Switching Freq-Max, BICMOS, 4 X 4 MM, 0.80
MAX8647	MAXIM	获取价格	Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN
MAX8647	ADI	获取价格	可驱动6只白光/RGB LED的超高效电荷泵，3mm x 3mm薄型QFN封装
MAX8647_0709	MAXIM	获取价格	Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN

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