MAX8647ETE+T【PDF 1/15 页】IC LED DRVR WT/RGB BCKLGT 16TQFN

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19-0790; Rev 1; 9/07

ATION

EVALU

AVAILA

KIT

BLE

Ultra-Efficient Charge Pumps for

Six White/RGB LEDs in 3mm x 3mm Thin QFN

General Description

Features

The MAX8647/MAX8648 drive up to six white LEDs or

two sets of RGB LEDs with regulated constant current

for display backlight and fun light applications. By utiliz-

ing an inverting charge pump and extremely low-

dropout adaptive current regulators, these ICs achieve

very high efficiency over the full 1-cell Li+ battery volt-

age range and even with large LED forward voltage

mismatch. The 1MHz fixed-frequency switching allows

for tiny external components. The regulation scheme is

optimized to ensure low EMI and low input ripple. The

MAX8647/MAX8648 include thermal shutdown, open-

and short-circuit protection.

The MAX8647 features an I 2 C serial port, while the

MAX8648 features a three-wire serial-pulse logic inter-

face. Both devices support independent on/off and

dimming for main and subbacklights. The dimming

ranges are pseudo-logarithmic from 24mA to 0.1mA

Six Adaptive Current Regulators

Independent Voltage Supply for Each LED

Individual LED Brightness Control (MAX8647)

24mA to 0.1mA Dimming Range

I 2 C Interface (MAX8647)

Serial-Pulse Dimming Logic (MAX8648)

±2% Accuracy, ±0.4% Matching (typ)

Low 70 μ A Quiescent Current

Low 1 μ A Shutdown Current

Inrush Current Limit

T A Derating Function Protects LEDs

16-Pin, 3mm x 3mm Thin QFN Package

Ordering Information

and off in 32 steps. Both devices include a temperature

derating function to safely allow bright 24mA full-scale

PART

DIMMING

PACKAGE

TOP

MARK

PKG

CODE

output current setting while automatically reducing cur-

rent to protect LEDs at high ambient temperatures

MAX8647 ETE+ I 2 C interface 16 Thin QFN-EP*

AFD

T1633-5

above +60°C.

The MAX8647/MAX8648 are available in a 16-pin, 3mm

x 3mm thin QFN package (0.8mm max height).

MAX8648 ETE+

Serial-pulse

logic

16 Thin QFN-EP*

AFE

T1633-5

Applications

White LED Backlighting, Single or Dual Display

Wide-Gamut RGB LED Display Backlighting

Camera Flash or RGB Indicators

Cellular Phones and Smartphones

Note: All devices are specified over the -40°C to +85°C extended

temperature range.

+Denotes a lead-free package.

*EP = Exposed paddle.

Typical Operating Circuit

PDAs, Digital Cameras, and Camcorders

1 μ F

TOP VIEW

Pin Configuration

INPUT

2.7V TO 5.5V

C1P

C1N

C2P

C2N

NEG

1 μ F

GND

WHITE

LED1 13

LED6

OR RGB LED

SDA (ENC) 14

NEG

MAX8648

LED1

SCL (ENB) 15

MAX8647ETE

MAX8648ETE

C1N

LED2

V DD (ENA) 16

C2N

ENA

LED3

SERIAL-

PULSE

ENB

LED4

THIN QFN

INTERFACE

ENC

LED5

LED6

( ) DESIGNATE PINS ON THE MAX8648

________________________________________________________________ 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.

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