MAX1573 Maxim Integrated Products, MAX1573 Datasheet
MAX1573
Manufacturer Part Number
MAX1573
Description
White LED 1x/1.5x Charge Pump
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1573.pdf
(8 pages)
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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.
19-2847; Rev 0; 4/03
UCSP is a trademark of Maxim Integrated Products, Inc.
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.
CONTROL
DIMMING
2.7V TO 5.5V
ON/OFF
AND
Cell Phones, Smart Phones
PDAs, Digital Cameras, Camcorders
MP3 Players
Other Handhelds with Color Displays
V
1µF
R
IN
SET
IN
EN1
EN2
SET
C1N
Typical Operating Circuit
1µF
White LED 1x/1.5x Charge Pump in UCSP
________________________________________________________________ Maxim Integrated Products
MAX1573
C1P
GND
C2N
General Description
1µF
LED1
LED2
LED3
LED4
C2P
OUT
1µF
Applications
UP TO 4 LEDS
V
OUT
o Proprietary Adaptive 1x/1.5x Modes
o High Efficiency (P
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
MAX1573EBE-T
TOP VIEW
PART
C
D
A
B
C1P
C2N
C1N
IN
1
LEDs
-40°C to +85°C
TEMP RANGE
Ordering Information
UCSP 4
OUT
GND
C2P
2
/P
Pin Configuration
BATT
✕
LED4
LED3
EN1
3
4
), Up to 92%
www.DataSheet4U.com
PIN-PACKAGE
14 UCSP (4 x 4)
LED2
LED1
EN2
SET
4
Features
1
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