MAX1570 Maxim Integrated Products, MAX1570 Datasheet
MAX1570
Manufacturer Part Number
MAX1570
Description
White LED Current Regulator
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1570.pdf
(11 pages)
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Price
Company:
Part Number:
MAX1570ETE+
Manufacturer:
Maxim Integrated Products
Quantity:
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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 mod-
ulation (PWM) signal can also be used to modulate LED
brightness.
The MAX1570 is available in 16-pin 4mm
QFN packaging (0.8mm max height).
19-2526; Rev 0; 7/02
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.
White LED Backlighting
Cell Phones and Smart Phones
PDA and Palmtop Computers
Portable MP3 Players
Digital Cameras and Camcorders
LED5
GND
C1P
EN2
White LED Current Regulator with 1x/1.5x
1
2
3
4
________________________________________________________________ Maxim Integrated Products
LED4 LED3 LED2 LED1
C2N OUT C2P IN
16
5
(4mm x 4mm)
General Description
MAX1570
THIN QFN
15
6
Pin Configuration
14
7
13
8
Applications
12
11
10
9
C1N
PGND
EN1
SET
✕
High-Efficiency Charge Pump
4mm Thin
o Excellent 0.3% LED-to-LED Current Matching
o 30mA/LED Drive Capability
o Proprietary 1x/1.5x Modes for Ultra-High
o Low Input Ripple and EMI
o Eliminates Ballast Resistors
o Digital or PWM LED Dimming Control
o 0.1µA Shutdown Current
o 2.7V to 5.5V Supply Voltage Range
o Soft-Start Limits Inrush Current
o Thermal-Shutdown Protection
o No External Inductor, Schottky, or Zener Diode
o Tiny 16-Pin 4mm
MAX1570ETE
Efficiency
Required
DIMMING
2.7V TO 5.5V
ON/OFF
PART
R SET
AND
EN1
EN2
SET
1µF
IN
Typical Operating Circuit
REGULATING CHARGE PUMP
REFERENCE
CONTROL
C1P
1µF
AND
-40°C to +85°C
TEMP RANGE
GND
✕
Ordering Information
1x/1.5x
4mm Thin QFN Package
C1N C2P
MAX1570
LOW-DROPOUT
REGULATORS
1µF
CURRENT
PGND
C2N
www.DataSheet4U.com
OUT
LED1
LED2
LED3
LED4
LED5
PIN-PACKAGE
16 Thin QFN
4.7µF
Features
1