Datasheet > MAX8847YETE+T

MAX8847YETE+T

更新时间： 2024-11-09 11:14:31

品牌	Logo	应用领域
美信 - MAXIM		泵
页数	文件大小	规格书
13页	1545K
描述
High-Performance Negative Charge Pump for 6 White LEDs in 3mm x 3mm Thin QFN

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MAX8847YETE+T 数据手册

19-5196; Rev 0; 4/10

High-Performance Negative Charge Pump

for 6 White LEDs in 3mm x 3mm Thin QFN

General Description

Features

The MAX8847Y/MAX8847Z negative charge pumps

drive up to 6 white LEDs with regulated constant current

for display backlight applications. By utilizing an invert-

ing charge pump and extremely low-dropout adaptive

current regulators, these ICs achieve very high efficiency

over the full 1-cell Li+ battery voltage range 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 MAX8847Y/MAX8847Z include

thermal shutdown, open- and short-circuit protection.

S Negative 1x/1.5x Charge Pump

S Adaptive Current Regulators

S Independent Voltage Supply for Each LED

S 24mA to 0.1mA Serial-Pulse Dimming (MAX8847Y)

S 24mA to 0mA PWM Dimming (MAX8847Z)

S 2% (max) LED Current Accuracy, 1% (typ) Matching

S Low 120µA Quiescent Current

S Low 0.4µA Shutdown Current

S Inrush Current Limit

The MAX8847Y/MAX8847Z support independent LED

on/off and dimming control. The MAX8847Z has PWM

dimming control for LED1–LED6. The MAX8847Y has

PWM dimming control for LED1–LED4 and serial-pulse

dimming control for LED5 and LED6. The serial-pulse

dimming ranges are pseudo-logarithmic from 24mA to

0.1mA and off in 32 steps. All devices include a tempera-

ture derating function to safely allow bright 24mA full-

scale output current while automatically reducing current

gradually to protect LEDs at high ambient temperatures

above +60°C.

S Temperature Derating Function

S 16-Pin, 3mm x 3mm Thin QFN Packages

Typical Operating Circuit

1µF

C1P

C1N

C2P

C2N

INPUT

2.7V TO 5.5V

1µF

The MAX8847Y/MAX8847Z are available in 16-pin,

3mm x 3mm thin QFN packages.

NEG

1µF

GND

Applications

White LED Backlighting

LED1

MAX8847Y

MAX8847Z

LED ENABLE

AND

DIMMING

CONTROL

Cellular Phones

ENA

ENB

LED2

LED3

LED4

LED5

LED6

PDAs, Digital Cameras, and Camcorders

Ordering Information

CPWM

TOP

MARK

PART

DIMMING

PIN-PACKAGE

0.22µF

Serial pulse/

PWM

MAX8847YETE+T

MAX8847ZETE+T

16 Thin QFN-EP*

AHQ

PWM

AHP

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

extended temperature range.

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

*EP = Exposed pad.

_______________________________________________________________ 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...13

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与MAX8847YETE+T相关器件

型号	品牌	获取价格	描述	数据表
MAX8847Z	MAXIM	获取价格	High-Performance Negative Charge Pump for 6 White LEDs in 3mm x 3mm Thin QFN
MAX8847ZETE+T	MAXIM	获取价格	High-Performance Negative Charge Pump for 6 White LEDs in 3mm x 3mm Thin QFN
MAX8848Y	MAXIM	获取价格	High-Performance Negative Charge Pump for 7 White LEDs in 3mm x 3mm Thin QFN
MAX8848YETE+T	MAXIM	获取价格	High-Performance Negative Charge Pump for 7 White LEDs in 3mm x 3mm Thin QFN
MAX8848Z	MAXIM	获取价格	High-Performance Negative Charge Pump for 7 White LEDs in 3mm x 3mm Thin QFN
MAX8848ZETE+T	MAXIM	获取价格	High-Performance Negative Charge Pump for 7 White LEDs in 3mm x 3mm Thin QFN
MAX884C	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
MAX884C/D	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
MAX884CPA	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
MAX884CSA	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators

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