MAX1570ETE+ Maxim Integrated Products, MAX1570ETE+ Datasheet

IC LED DRVR WHITE BCKLGT 16-TQFN

MAX1570ETE+

Manufacturer Part Number
MAX1570ETE+
Description
IC LED DRVR WHITE BCKLGT 16-TQFN
Manufacturer
Maxim Integrated Products
Type
Backlight, White LEDr
Datasheet

Specifications of MAX1570ETE+

Constant Current
Yes
Topology
PWM, Step-Down (Buck), Step-Up (Boost), Switched Capacitor (Charge Pump)
Number Of Outputs
5
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
White LED
Frequency
1MHz
Voltage - Supply
2.7 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
16-TQFN Exposed Pad
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
30mA
Internal Switch(s)
Yes
Number Of Segments
5
Low Level Output Current
30 mA
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Supply Current
3.5 mA
Maximum Power Dissipation
1349 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Efficiency
-
Lead Free Status / Rohs Status
 Details
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 1; 4/05
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.
TOP VIEW
White LED Backlighting
Cell Phones and Smart Phones
PDA and Palmtop Computers
Portable MP3 Players
Digital Cameras and Camcorders
OUT
C2N
C2P
IN
13
14
15
16
White LED Current Regulator with 1x/1.5x
________________________________________________________________ Maxim Integrated Products
12
1
4mm x 4mm
THIN QFN
General Description
MAX1570
11
2
Pin Configuration
10
3
9
4
Applications
8
7
6
5
LED1
LED2
LED3
LED4
4mm Thin
High-Efficiency Charge Pump
♦ Excellent 0.3% LED-to-LED Current Matching
♦ 30mA/LED Drive Capability
♦ Proprietary 1x/1.5x Modes for Ultra-High
♦ 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
♦ Tiny 16-Pin 4mm
♦2
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
LED1
LED2
LED3
LED4
LED5
OUT
PIN-PACKAGE
16 Thin QFN
4.7µF
Features
1

Related parts for MAX1570ETE+

MAX1570ETE+ Summary of contents

Page 1

... C2N THIN QFN 4mm x 4mm ________________________________________________________________ Maxim Integrated Products 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. High-Efficiency Charge Pump ♦ Excellent 0.3% LED-to-LED Current Matching ♦ 30mA/LED Drive Capability ♦ Proprietary 1x/1.5x Modes for Ultra-High Efficiency ♦ ...

Page 2

White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump ABSOLUTE MAXIMUM RATINGS IN, OUT, EN1, EN2 to GND ......................................-0.3V to +6V SET, LED1, LED2, LED3, LED4, LED5 to GND ...........................................-0. PGND to GND..........................................................-0.3 to +0.3V C1N, C2N to ...

Page 3

... Note 2: Dropout voltage is defined as the LED_ to GND voltage at which current sink into LED_ drops 10% from the value at LED_ = 1V. Note 3: Specifications to -40°C are guaranteed by design and not production tested. Dual Mode is a trademark of Maxim Integrated Products, Inc. _______________________________________________________________________________________ High-Efficiency Charge Pump = 1µ ...

Page 4

White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump (EN1 = EN2 = IN 1µ 1µ LED EFFICIENCY vs. SUPPLY VOLTAGE (4 LEDs) 100 10mA/LED, EN1 = V , EN2 = GND ...

Page 5

White LED Current Regulator with 1x/1.5x (EN1 = EN2 = IN 1µ 1µ LED CURRENT vs. SUPPLY VOLTAGE EN1 = EN2 = EN1 = V ...

Page 6

White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump PIN NAME 1 C1P Transfer Capacitor 1 Positive Connection Enable, Dimming Control Input 2. EN2 and EN1 control shutdown, 1/3 current, 2/3 current, and full 2 EN2 current (see Table1). 3 ...

Page 7

White LED Current Regulator with 1x/1.5x Detailed Description The MAX1570 is a complete charge-pump buck/boost converter requiring only four small ceramic capacitors. The MAX1570 utilizes a proprietary 1x/1.5x fractional charge-pump topology to drive up to five white LEDs with regulated ...

Page 8

White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump Table 1. Enable Input Modes EN_ INPUT LOGIC LEVELS EN1 = 0, EN2 = 0 EN1 = 0, EN2 = 1 EN1 = 1, EN2 = 0 EN1 = 1, EN2 ...

Page 9

White LED Current Regulator with 1x/1.5x For LED drivers, input ripple is more important than out- put ripple. Input ripple depends on the source supply’s impedance. Adding a lowpass filter to the input further reduces input ripple. Figure 3 shows ...

Page 10

White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 10 ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, 12, 16, ...

Page 11

... 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 © 2005 Maxim Integrated Products ...

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