MAX8645Y Maxim Integrated Products, MAX8645Y Datasheet

MAX8645Y

Manufacturer Part Number

MAX8645Y

Description

(MAX8645X/Y) 1x/1.5x/2x White LED Charge Pumps

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8645Y.pdf (15 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MAX8645YETI

Manufacturer:

MAXIM

Quantity:

589

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MAX8645YETI+

Manufacturer:

MAXIM

Quantity:

119

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MAX8645YETI+T

Manufacturer:

Quantity:

2 261

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Download datasheet (346Kb)

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.

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

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

19-3978; Rev 3; 12/06

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.

DUAL-LDO ON/OFF

AND DIMMING

MAIN ON/OFF

FLASH ON/OFF

SELECTION

DUAL-LDO

INPUT

2.7V TO 5.5V

VOLTAGE

10μF

Camera Phones and Smartphones

Backlighting and Flash

PDAs, Digital Cameras, and Camcorders

GND

PGND

ENM1

ENM2

ENF

ENLDO

C1P

SETM

Typical Operating Circuit

1μF

C1N

________________________________________________________________ Maxim Integrated Products

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

MAX8645X

MAX8645Y

SETF

C2P

General Description

1μF

REF

C2N

LDO1

LDO2

OUT

0.01μF

UP TO 580mA

OUTPUT

10μF

1μF

Applications

1μF

Two LDOs in 4mm x 4mm TQFN

MAIN

MODULE

CAMERA

FLASH

♦ Power Up to Eight LEDs

♦ Two Internal Low-Noise 200mA LDOs

♦ 94% Max/85% Avg Efficiency (P

♦ 0.2% Typical LED Current Matching

♦ Adaptive 1x/1.5x/2x Mode Switchover

♦ Flexible Brightness Control

♦ Thermal T

♦ Low Input Ripple and EMI

♦ 2.7V to 5.5V Supply Voltage Range

♦ Soft-Start, Overvoltage, and Thermal-Shutdown

♦ 28-Pin TQFN, 4mm x 4mm Package

EP = Exposed paddle.

+Denotes a lead-free package.

Pin Configuration appears at end of data sheet.

MAX8645XETI+

MAX8645YETI+

Battery Discharge

Protection

Up to 30mA/LED Drive for Backlight

Up to 400mA Total Drive for Flash

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

2-Bit Logic (Three Levels)

PART

Derating Function

TEMP RANGE

-40°C to +85°C

Ordering Information

PIN-

PACKAGE

28 TQFN-EP

4mm x 4mm

28 TQFN-EP

4mm x 4mm

LED

BATT

Features

) over Li+

T2844-1

CODE

PKG

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