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MAX1573 Datasheet دیتاشیت PDF دانلود

دیتاشیت - Maxim Integrated Products - White LED 1x/1.5x Charge Pump

شماره قطعه MAX1573
شرح مفصل White LED 1x/1.5x Charge Pump
تولید کننده Maxim Integrated Products 
آرم Maxim Integrated Products 


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MAX1573 شرح
19-2847; Rev 0; 4/03
www.DataSheet4U.com
White LED 1x/1.5x Charge Pump in UCSP
General Description
The MAX1573 fractional charge pump drives up to four
white LEDs with regulated constant current for uniform
intensity. By utilizing proprietary adaptive 1x/1.5x
modes and ultra-low-dropout current regulators, it
maintains the highest possible efficiency over the full
1-cell Li+ battery input 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.
An external resistor sets the full-scale LED current, while
two digital inputs control on/off and select amongst three
levels of brightness. A pulse-width modulation (PWM)
signal can also be used to modulate LED brightness,
requiring no additional components.
The MAX1573 is available in the chip-scale package
(UCSP™) (4 x 4 grid) to minimize PC board area.
Applications
Cell Phones, Smart Phones
PDAs, Digital Cameras, Camcorders
MP3 Players
Other Handhelds with Color Displays
Features
o Proprietary Adaptive 1x/1.5x Modes
o High Efficiency (PLEDs/PBATT), Up to 92%
o 2% LED Current Matching and Accuracy
o 28mA/LED Drive Capability
o Low Input Ripple and EMI
o Eliminates Ballast Resistors
o Logic or PWM Dimming Control
o Low 0.1µA Shutdown Current
o 2.7V to 5.5V Input Voltage Range
o Soft-Start Limits Inrush Current
o Output Overvoltage Protection
o Thermal Shutdown Protection
o No External Schottky Diode Required
o Tiny 2.1mm x 2.1mm x 0.6mm UCSP Package
PART
MAX1573EBE-T
Ordering Information
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 14 UCSP (4 x 4)
Typical Operating Circuit
Pin Configuration
1µF 1µF
VIN
2.7V TO 5.5V
1µF
ON/OFF
AND
DIMMING
CONTROL
RSET
C1N C1P C2N C2P
IN OUT
EN1 MAX1573 LED1
EN2 LED2
LED3
SET LED4
GND
1µF
VOUT
UP TO 4 LEDS
TOP VIEW
A
B
C
D
1 234
C1P OUT EN1 EN2
C2N C2P
SET
IN LED4 LED2
C1N GND LED3 LED1
UCSP is a trademark of Maxim Integrated Products, Inc.
UCSP 4 4
________________________________________________________________ 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.

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