MAX1561ETA-T Maxim Integrated Products, MAX1561ETA-T Datasheet

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MAX1561ETA-T

Manufacturer Part Number
MAX1561ETA-T
Description
LED Drivers HIgh Efficiency 26V Step-Up Converter fo
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1561ETA-T

Number Of Segments
6
Operating Supply Voltage
2.6 V to 5.5 V
Maximum Power Dissipation
1950 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
TDFN EP
Minimum Operating Temperature
- 40 C

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The MAX1561/MAX1599 step-up converters drive up to
six white LEDs with a constant current to provide back-
light in cell phones, PDAs, and other hand-held
devices. The step-up converter topology allows series
connection of the white LEDs so the LED currents are
identical for uniform brightness. This configuration elim-
inates the need for ballast resistors and expensive fac-
tory calibration.
The MAX1561/MAX1599 include an internal, high-volt-
age, low-R
efficiency and maximum battery life. A single Dual
Mode™ input provides a simple means of brightness
adjustment and on/off control. Fast 1MHz (500kHz for
the MAX1599) current-mode, pulse-width modulated
(PWM) operation allows for small input and output
capacitors and a small inductor while minimizing ripple
on the input supply/battery. Programmable soft-start
eliminates inrush current during startup.
Both devices are available in a space-saving, 8-pin 3mm
x 3mm thin DFN package with exposed paddle (EP).
19-2731; Rev 1; 10/03
Dual Mode is a trademark of Maxim Integrated Products, Inc.
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.
INPUT 2.6V TO 5.5V
DIMMING
PWM OR
ANALOG
Cell Phones and Smart Phones
PDAs, Palmtops, and Wireless Handhelds
e-Books and Subnotebooks
White LED Display Backlighting
DS(ON)
Typical Operating Circuit
IN
COMP
CTRL
________________________________________________________________ Maxim Integrated Products
N-channel MOSFET switch for high
High-Efficiency, 26V Step-Up Converters
MAX1561
MAX1599
GND
General Description
PGND
OUT
CS
LX
Applications
OUTPUT UP TO 6 LEDs
for Two to Six White LEDs
*EP = Exposed paddle.
MAX1561ETA
MAX1599ETA
Accurate Current Regulation for Uniform
Illumination
High Efficiency Up to 87%
Flexible Analog or PWM Dimming Control
Up to 900mW Output Power with Internal 30V
MOSFET Switch
Fast 1MHz (MAX1561) or 500kHz (MAX1599) PWM
Operation
Small, Low-Profile External Components
2.6V to 5.5V Input Range
26V (max) Output with Overvoltage Protection
Optimized for Low 15mV
Soft-Start with Zero Inrush Current
0.3µA Shutdown Current
Tiny 8-Pin 3mm x 3mm Thin DFN Package
PART
TOP VIEW
-40 C to +85 C 8 TDFN-EP*
-40 C to +85 C 8 TDFN-EP*
TEMP RANGE
CTRL
OUT
CS
IN
1
2
4
3
3mm × 3mm
Ordering Information
THIN DFN
MAX1561
MAX1599
Pin Configuration
P-P
PIN-PACKAGE
Input Ripple
6
8
7
5
LX
GND
PGND
COMP
Features
MARK
AHG
TOP
ACS
1

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MAX1561ETA-T Summary of contents

Page 1

... Input Range 26V (max) Output with Overvoltage Protection Optimized for Low 15mV Soft-Start with Zero Inrush Current 0.3µA Shutdown Current Tiny 8-Pin 3mm x 3mm Thin DFN Package Applications PART MAX1561ETA MAX1599ETA *EP = Exposed paddle. TOP VIEW OUTPUT LEDs Features Input Ripple P-P ...

Page 2

High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to +6V PGND to GND .......................................................-0.3V to +0.3V LX, OUT to GND .....................................................-0.3V to +30V CTRL to GND...................-0.3V to the lower of +6V ...

Page 3

High-Efficiency, 26V Step-Up Converters ELECTRICAL CHARACTERISTICS (continued 3V 20V 0.1µ OUT OUT wise noted. Typical values are +25°C.) A PARAMETER N-CHANNEL SWITCH LX On-Resistance Leakage Current ...

Page 4

High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs (Circuit of Figure 3.6V 15mA 22µ LED T = +25°C, unless otherwise noted.) A MAX1561 EFFICIENCY vs. LED CURRENT (vs. NUMBER ...

Page 5

High-Efficiency, 26V Step-Up Converters (Circuit of Figure 3.6V 15mA 22µ LED T = +25°C, unless otherwise noted.) A SWITCHING WAVEFORMS MAX1561 toc10 V IN 10mV/div V OUT 100mV/div V LX 10V/div ...

Page 6

High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs PIN NAME Overvoltage Sense. When V 1 OUT drops below 25V, then the IC reenters soft-start. Connect a 0.1µF capacitor from OUT to PGND Input Voltage Supply. Input ...

Page 7

High-Efficiency, 26V Step-Up Converters INPUT 2.6V TO 5.5V PWM CONTROL f OSC 450kΩ PWM OR CTRL ANALOG DIMING 170mV Figure 1. Functional Diagram Design Procedure Adjusting LED Current Adjusting the MAX1561/MAX1599s’ output current changes the brightness of the LEDs. An ...

Page 8

High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs input and output ripple, but at the expense of size and higher cost. C stabilizes the converter and con- COMP trols soft-start. Connect a 0.1µF capacitor from COMP to GND. ...

Page 9

High-Efficiency, 26V Step-Up Converters (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.) D PIN 1 INDEX AREA NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY ...

Page 10

... 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products Package Information (continued) ...

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