MAX1573 查看數據表（PDF） - Maxim Integrated
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MAX1573 Datasheet PDF : 9 Pages
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19-2847; Rev 2; 8/05
White LED 1x/1.5x Charge Pump in
UCSP and Thin QFN
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 tiny chip-scale UCSP™
(4 x 4 grid) and 16-pin thin QFN packages.
Applications
Cell Phones, Smart Phones
PDAs, Digital Cameras, Camcorders
MP3 Players
Other Handhelds with Color Displays
Typical Operating Circuit
Features
♦ Proprietary Adaptive 1x/1.5x Modes
♦ High Efficiency (PLEDs/PBATT), Up to 92%
♦ 0.2% LED Current Matching
♦ 28mA/LED Drive Capability
♦ Low Input Ripple and EMI
♦ Eliminates Ballast Resistors
♦ Logic or PWM Dimming Control
♦ Low 0.1µA Shutdown Current
♦ 2.7V to 5.5V Input Voltage Range
♦ Soft-Start Limits Inrush Current
♦ Output Overvoltage Protection
♦ Thermal Shutdown Protection
♦ No External Schottky Diode Required
♦ Tiny UCSP (2.1mm x 2.1mm x 0.6mm) and Thin
QFN (4mm x 4mm) Packages
Ordering Information
PART
MAX1573EBE-T
TEMP RANGE
-40°C to +85°C
MAX1573ETE
MAX1573ETE+
-40°C to +85°C
-40°C to +85°C
+ Denotes lead-free package.
PIN-PACKAGE
14 UCSP (4 x 4)
16 Thin QFN
16 Thin QFN
Pin Configurations
1μF
1μF
TOP VIEW
12 11 10 9
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
VOUT
UP TO 4 LEDS
1μF
CIN 13
IN 14
C2N 15
C1P 16
MAX1573
1
2
3
4
8 LED1
7 LED2
6 SET
5 EN2
THIN QFN
4mm × 4mm
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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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