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Part Number: MAX1570
Description: The MAX1570 fractional charge pump drives up to five white LEDs with regulated constant current for un...
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MAX1570
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DataSheet
General Description
MAX1570 General Description
The MAX1570 fractional charge pump drives up to five white LEDs with regulated constant current for uniform intensity. The MAX1570 maintains the highest possible efficiency over the full 1-cell lithium-ion (Li+) battery input voltage range by utilizing a 1x/1.5x fractional charge pump and very-low-dropout current regulators. The MAX1570 operates with 1MHz fixed-frequency switching, allowing for tiny external components. 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 between three levels of brightness. A pulse-width modulation (PWM) signal can also be used to modulate LED brightness.
The MAX1570 is available in 16-pin 4mm ✕ 4mm Thin QFN packaging (0.8mm max height).
MAX1570 Maximum Ratings
IN, OUT, EN1, EN2 to GND.....................................-0.3V to +6V
SET, LED1, LED2, LED3, LED4,
LED5 to GND............................................-0.3V to (VIN + 0.3V)
PGND to GND.........................................................-0.3 to +0.3V
C1N, C2N to GND .........................................-0.3V to (VIN + 1V)
C1P, C2P to GND.........................................-0.3V to the greater
(VOUT + 1V) or (VIN + 1V)
OUT Short Circuit to GND.............................................Indefinite
Continuous Power Dissipation (TA = +70°C)
16-Pin Thin QFN (derate 16.9 mW/°C) .......................1349mW
Operating Temperature Range .........................-40°C to +85°C
Junction Temperature.....................................................+150°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10s) ...............................+300°C
SET, LED1, LED2, LED3, LED4,
LED5 to GND............................................-0.3V to (VIN + 0.3V)
PGND to GND.........................................................-0.3 to +0.3V
C1N, C2N to GND .........................................-0.3V to (VIN + 1V)
C1P, C2P to GND.........................................-0.3V to the greater
(VOUT + 1V) or (VIN + 1V)
OUT Short Circuit to GND.............................................Indefinite
Continuous Power Dissipation (TA = +70°C)
16-Pin Thin QFN (derate 16.9 mW/°C) .......................1349mW
Operating Temperature Range .........................-40°C to +85°C
Junction Temperature.....................................................+150°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10s) ...............................+300°C
MAX1570 Features
Excellent 0.3% LED-to-LED Current Matching
30mA/LED Drive Capability
Proprietary 1x/1.5x Modes for Ultra-High Efficiency
Low Input Ripple and EMI
Eliminates Ballast Resistors
Digital or PWM LED Dimming Control
0.1µA Shutdown Current
2.7V to 5.5V Supply Voltage Range
Soft-Start Limits Inrush Current
Thermal-Shutdown Protection
No External Inductor, Schottky, or Zener Diode Required
Tiny 16-Pin 4mm ✕ 4mm Thin QFN Package
30mA/LED Drive Capability
Proprietary 1x/1.5x Modes for Ultra-High Efficiency
Low Input Ripple and EMI
Eliminates Ballast Resistors
Digital or PWM LED Dimming Control
0.1µA Shutdown Current
2.7V to 5.5V Supply Voltage Range
Soft-Start Limits Inrush Current
Thermal-Shutdown Protection
No External Inductor, Schottky, or Zener Diode Required
Tiny 16-Pin 4mm ✕ 4mm Thin QFN Package
MAX1570 Typical Application
White LED Backlighting
Cell Phones and Smart Phones
PDA and Palmtop Computers
Portable MP3 Players
Digital Cameras and Camcorders
Cell Phones and Smart Phones
PDA and Palmtop Computers
Portable MP3 Players
Digital Cameras and Camcorders
MAX1570 Connection Diagram
MAX1570
PDF/DataSheet Download
- Datasheet: MAX1570
- File Size: 303576 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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