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PDF MAX1570 Data sheet ( Hoja de datos )
| Número de pieza | MAX1570 | |
| Descripción | White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1570 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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19-2526; Rev 0; 7/02
www.DataSheet4U.com
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
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
o Excellent 0.3% LED-to-LED Current Matching
o 30mA/LED Drive Capability
o Proprietary 1x/1.5x Modes for Ultra-High
Efficiency
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
Required
o Tiny 16-Pin 4mm ✕ 4mm Thin QFN Package
PART
MAX1570ETE
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
16 Thin QFN
Pin Configuration
C2N OUT C2P IN
16 15 14 13
C1P 1
EN2 2
GND 3
LED5 4
MAX1570
12 C1N
11 PGND
10 EN1
9 SET
5678
LED4 LED3 LED2 LED1
THIN QFN
(4mm x 4mm)
Typical Operating Circuit
1µF 1µF
C1P C1N C2P C2N
2.7V TO 5.5V IN
1µF
1x/1.5x
REGULATING CHARGE PUMP
OUT
4.7µF
ON/OFF
AND
DIMMING
EN1
EN2
SET
RSET
MAX1570
REFERENCE
AND
CONTROL
LOW-DROPOUT
CURRENT
REGULATORS
LED1
LED2
LED3
LED4
LED5
GND PGND
________________________________________________________________ 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.
1 page  
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White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
Typical Operating Characteristics (continued)
(EN1 = EN2 = IN, CIN = 1µF, C1 = C2 = 1µF, COUT = 4.7µF, RSET = 9.09kΩ, TA = +25°C, unless otherwise noted.)
LED CURRENT vs. SUPPLY VOLTAGE
20
18
16 EN1 = EN2 = VIN
14
12
10 EN1 = VIN, EN2 = GND
8
6 EN1 = GND, EN2 = VIN
4
2
0
2.5
3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
LED CURRENT vs. TEMPERATURE
(VIN = 3.3V, RSET = 7.5kΩ)
12.0
11.9
11.8
11.7
11.6
11.5
11.4
11.3
11.2
11.1
11.0
-40
EN1 = IN
EN2 = GND
-15 10 35 60
TEMPERATURE (°C)
85
30
25
20
15
10
5
0
5.0
LED CURRENT vs. RSET
EN1
=
EN1 =
IN, EN2
EN2 = IN
= GND
EN1 = GND, EN2 = IN
7.5 10.0 12.5
RSET (kΩ)
15.0
TYPICAL OPERATING WAVEFORM
IN 1X MODE
MAX1570 toc13
TYPICAL OPERATING WAVEFORM
IN 1.5X MODE (ILOAD = 90mA, VIN = 3.6V)
MAX1570 toc14
IIN
AC-COUPLED
10mA/div
IIN
AC-COUPLED
10mA/div
VIN
AC-COUPLED
1mV/div
VIN
AC-COUPLED
20mV/div
VOUT
AC-COUPLED
1mV/div
VOUT
AC-COUPLED
5mV/div
STARTUP RESPONSE (VIN = 3.3V)
(5 LEDs AT 15mA/LED)
MAX1570 toc15
IIN
50mA/div
VOUT
2V/div
2µs/div
400ns/div
DIMMING RESPONSE USING
PWM INTO EN1
MAX1570 toc16
ILED
15mA TO 5mA
5mA/div
400µs/div
LINE-TRANSIENT RESPONSE
MAX1570 toc17
ILED
15mA
5mA/div
VOUT
AC-COUPLED
500mV/div
VOUT
AC-COUPLED
500mV/div
100µs/div
EN1
0 TO 2V
2V/div
100µs/div
VIN
4 TO 3.6V
500mV/div
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE
12,16,20,24L QFN THIN, 4x4x0.8 mm
21-0139
A
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX1570.PDF ] | |
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