Rainbow-electronics MAX8645Y Manual de usuario descargar pdf

EVALUATION KIT

AVAILABLE

General Description

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.

Applications

Camera Phones and Smartphones

Backlighting and Flash

PDAs, Digital Cameras, and Camcorders

Features

♦ 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

LED

BATT

) over Li+

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

♦ Low Input Ripple and EMI

♦ 2.7V to 5.5V Supply Voltage Range

♦ Soft-Start, Overvoltage, and Thermal-Shutdown

Protection

♦ 28-Pin TQFN, 4mm x 4mm Package

MAX8645X/MAX8645Y

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

Two LDOs in 4mm x 4mm TQFN

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

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.

PART TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX8645XETI+ -40°C to +85°C

28 TQFN-EP

4mm x 4mm

T2844-1

MAX8645YETI+ -40°C to +85°C

28 TQFN-EP

4mm x 4mm

T2844-1

Pin Configuration appears at end of data sheet.

MAIN ON/OFF

AND DIMMING

MAX8645X

MAX8645Y

1μF

10μF

0.01μF

10μF

PGND

GND

OUT

MAIN

FLASH

OUTPUT

UP TO 580mA

1μF1μF

LDO1

LDO2

C2P C2N

1μF

C1P C1N

REFSETM SETF

CAMERA

MODULE

DUAL-LDO

VOLTAGE

SELECTION

INPUT

2.7V TO 5.5V

ENM2

ENM1

ENF

ENLDO

FLASH ON/OFF

DUAL-LDO ON/OFF

Typical Operating Circuit

EP = Exposed paddle.

+Denotes a lead-free package.

1 2 3 4 5 6 ... 14 15

Indice de contenidos

Pagina 1 - Two LDOs in 4mm x 4mm TQFN

EVALUATION KITAVAILABLEGeneral DescriptionThe MAX8645X/MAX8645Y charge pumps drive up toeight white LEDs with regulated constant current for uni-form

Pagina 2

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with TwoLDOs in 4mm x 4mm TQFN10 __________________________________________________________________

Pagina 3

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with TwoLDOs in 4mm x 4mm TQFN_____________________________________________________________________

Pagina 4

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with TwoLDOs in 4mm x 4mm TQFN12 __________________________________________________________________

Pagina 5

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pump with Two LDOs in 4mm x 4mm TQFN_____________________________________________________________________

Pagina 6

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm Thin QFN14 _____________________________________________________________

Pagina 7

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with TwoLDOs in 4mm x 4mm TQFNMaxim cannot assume responsibility for use of any circuitry other tha

Pagina 8

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with TwoLDOs in 4mm x 4mm TQFN2 ___________________________________________________________________

Pagina 9

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with TwoLDOs in 4mm x 4mm TQFN_____________________________________________________________________

Pagina 10 - LDOs in 4mm x 4mm TQFN

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN4 __________________________________________________________________

Pagina 11

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN____________________________________________________________________

Pagina 12

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with TwoLDOs in 4mm x 4mm TQFN6 ___________________________________________________________________

Pagina 13 - MAX8645YETI

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with TwoLDOs in 4mm x 4mm TQFN_____________________________________________________________________

Pagina 14

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with TwoLDOs in 4mm x 4mm TQFN8 ___________________________________________________________________

Pagina 15

MAX8645X/MAX8645Y1x/1.5x/2x White LED Charge Pumps with TwoLDOs in 4mm x 4mm TQFN_____________________________________________________________________

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