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MAX1577Y Datasheet دیتاشیت PDF دانلود

دیتاشیت - Maxim Integrated Products - 1.2A White LED Regulating Charge Pump

شماره قطعه MAX1577Y
شرح مفصل 1.2A White LED Regulating Charge Pump
تولید کننده Maxim Integrated Products 
آرم Maxim Integrated Products 


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MAX1577Y شرح
19-3461; Rev 0; 11/04
EVALUATION KIT AVAILABLE
www.DataSheet4U.com
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
General Description
The MAX1577Y/MAX1577Z charge pumps drive white
LEDs, including camera strobes, with regulated current
up to 1.2A (guaranteed to 800mA). The very low open-
loop output resistance allows high flash brightness,
even from a low battery input voltage. The adaptive
1x/2x regulating charge-pump operation provides high
efficiency (up to 92%) while in movie mode or back-
lighting. Fast (1MHz) switching allows the use of tiny
external components.
The MAX1577Y/MAX1577Z use an external resistor to
set the full-scale LED current. Two enable inputs (EN1
and EN2) provide simple on/off control and LED current
of 20%, 33%, or 100% full scale. If there is less than
24mV across the external resistor, the output voltage is
regulated. The MAX1577Z has fixed 5.1V output-volt-
age regulation, while the MAX1577Y has logic-con-
trolled output voltage of 3.4V, 4.6V, or 5.1V for
backlighting, keyboard, and RGB applications.
The MAX1577Y/MAX1577Z are available in an 8-pin,
3mm x 3mm TDFN package (0.8mm max height).
Applications
White LED Flashes, Strobes, and Movie Lights
LCD Backlighting
Camera Phones, Cell Phones, and Smart Phones
PDAs, Digital Cameras, and Camcorders
Features
Up to 1.2A Output Drive Capability (800mA
Guaranteed)
Up to 92% PLED / PBATT Efficiency for Movie
Mode
Flexible Brightness Control
Two-Bit Logic for 100%, 33%, 20%, and Off
PWM for 20% to 100%
3% Current Regulation Over Line and
Temperature
Current or Voltage Regulation for Flash and
Backlighting (MAX1577Y)
Current Regulation for Flash (MAX1577Z)
Low Ripple and EMI
2.7V to 5.5V Supply Voltage Range
Soft-Start Limits Inrush Current
Output-Voltage Regulation Mode
Thermal-Shutdown Protection
8-Pin 3mm x 3mm TDFN Package
Ordering Information
PART
MAX1577YETA
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
8 TDFN
(T833-2)
TOP
MARK
AMG
MAX1577ZETA
-40°C to +85°C
8 TDFN
(T833-2)
AMQ
Typical Operating Circuit
1µF OR 2.2µF
2.7V TO 5.5V
4.7µF
CP
IN
GND
CN
5.3V OVP
OUT
10µF
UP TO 1.2A
100%,
33%, 20%,
AND
SHUTDOWN
MAX1577Z
EN1 CS
VOUT - (300mV OR
100mV OR 60mV)
EN2
TOP VIEW
Pin Configuration
876 5
MAX1577Y
MAX1577Z
1234
TDFN
________________________________________________________________ Maxim Integrated Products 1
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.

قانون اساسیصفحه 11
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دیتاشیت توصیه

شماره قطعه شرح مفصل تولید کنندگان
MAX1577Y 1.2A White LED Regulating Charge Pump Maxim Integrated Products
Maxim Integrated Products
MAX1577Z 1.2A White LED Regulating Charge Pump Maxim Integrated Products
Maxim Integrated Products

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