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MAX1570 数据手册 - Maxim Integrated（美信）
制造商:
Maxim Integrated（美信）
封装:
TQFN-16
描述:
白光LED电流调节器，带有1 / 1.5倍高效率电荷泵 White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump
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MAX1570数据手册
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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 mod-
ulation (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).
Applications
White LED Backlighting
Cell Phones and Smart Phones
PDA and Palmtop Computers
Portable MP3 Players
Digital Cameras and Camcorders
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
MAX1570
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
________________________________________________________________ Maxim Integrated Products 1
16 15 14 13
9
10
11
12
SET
EN1
PGND
C1N
4
3
2
1
LED5
GND
EN2
C1P
5678
LED4
LED3 LED2 LED1
MAX1570
C2N OUT C2P IN
THIN QFN
(4mm x 4mm)
Pin Configuration
Ordering Information
LED1
LED2
LED3
LED4
LED5
4.7µF
PGNDGND
C1P C1N C2P C2N
1µF1µF
EN1
EN2
SET
IN
R
SET
1µF
2.7V TO 5.5V
ON/OFF
AND
DIMMING
1x/1.5x
REGULATING CHARGE PUMP
REFERENCE
AND
CONTROL
LOW-DROPOUT
CURRENT
REGULATORS
MAX1570
OUT
Typical Operating Circuit
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.
PART TEMP RANGE PIN-PACKAGE
MAX1570ETE -40°C to +85°C 16 Thin QFN
查询MAX1570供应商
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