MAX8595X MAXIM [Maxim Integrated Products], MAX8595X Datasheet

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MAX8595X

Manufacturer Part Number
MAX8595X
Description
High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.MAX8595X.pdf (8 pages)

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The MAX8595X/MAX8596X drive up to nine white LEDs
with constant current and high efficiency to provide
LCD backlighting in cell phones, PDAs, and other
handheld devices. The series connection allows the
LED currents to be identical for uniform brightness and
minimizes the number of traces to the LEDs. The
MAX8595X regulates constant LED current over the
entire temperature range. The MAX8596X features an
ambient-temperature derating function to avoid over-
driving the white LEDs during high ambient tempera-
tures, enabling higher drive current below +42°C.
A single Dual Mode™ input provides a simple means of
brightness adjustment and on/off control. Fast 1MHz
current-mode PWM operation allows for small input and
output capacitors and a small inductor while minimizing
ripple on the input supply/battery. Soft-start eliminates
inrush current during startup.
The MAX8595X/MAX8596X are available in a space-
saving, 8-pin, 3mm x 3mm TDFN package.
19-3485; Rev 0; 11/04
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.
200Hz TO 200kHz
PWM DIMMING
Cell Phones and Smart Phones
PDAs, Palmtops, and Wireless Handhelds
e-Books and Subnotebooks
White LED Display Backlighting
2.6V TO 5.5V
2.2µF
ANALOG OR
INPUT
with T
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
IN
CTRL
COMP
MAX8595X
MAX8596X
General Description
High-Efficiency, 36V Step-Up Converters
GND
A
PGND
Derating Option for 2 to 9 White LEDs
OUT
CS
LX
Applications
0.1µF
2 TO 9 LEDs
UP TO 38V
OUTPUT
♦ Up to Nine LEDs at 25mA
♦ Temperature Derating Function to Allow Fewer
♦ 86% Efficiency (P
♦ 1.7% Current-Regulation Accuracy
♦ Output Overvoltage Protection
♦ Flexible Dimming Control
♦ 1MHz PWM Switching Frequency
♦ 0.1µF Output Capacitor
♦ 12mV
♦ Soft-Start Eliminates Inrush Current
♦ 2.6V to 5.5V Input Range
♦ 0.3µA Shutdown Current
♦ Pin Compatible with the MAX1561 and MAX1599
♦ TDFN 3mm x 3mm x 0.8mm Package with
*Future product—contact factory for availability.
MAX8595XETA -40°C to +85°C 8 TDFN 3mm x 3mm T833-1
MAX8596XETA* -40°C to +85°C 8 TDFN 3mm x 3mm T833-1
LEDs for Same Light (MAX8596X)
Exposed Paddle
Analog
Direct-PWM Internal Filter
PART
TOP VIEW
P-P
Low Input Ripple
TEMP RANGE PIN-PACKAGE
3mm x 3mm x 0.8mm
LEDs
8
1
Ordering Information
MAX8595X
MAX8596X
TDFN
7
2
/ P
Pin Configuration
IN
6
3
)
5
4
Features
CODE
PKG
1

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MAX8595X Summary of contents

Page 1

... Pin Compatible with the MAX1561 and MAX1599 ♦ TDFN 3mm x 3mm x 0.8mm Package with Exposed Paddle PART MAX8595XETA -40°C to +85°C 8 TDFN 3mm x 3mm T833-1 MAX8596XETA* -40°C to +85°C 8 TDFN 3mm x 3mm T833-1 *Future product—contact factory for availability. OUTPUT ...

Page 2

... OUT Input Bias Current OUT = IN, CTRL = GND Output Voltage Range (Note 2) ERROR AMPLIFIER V CTRL CTRL to CS Regulation Input Bias Current V CS MAX8595X Maximum Brightness Clamp MAX8596X, Voltage V CTRL MAX8595Z CTRL Voltage for CS Maximum Brightness Clamp MAX8596Z CS Derating Function Start MAX8596Z, V Temperature ...

Page 3

High-Efficiency, 36V Step-Up Converters with T Derating Option for White LEDs A ELECTRICAL CHARACTERISTICS (continued 3.0V 22µ 2.2µ OUT wise noted. Typical values are +25°C.) ...

Page 4

... LEDs, T COMP SENSE A EFFICIENCY vs. LED CURRENT 6 LEDs 3 LEDs 8 LEDs LED CURRENT (mA) LED CURRENT vs. AMBIENT TEMPERATURE MAX8596 25mA +25°C LED A MAX8595 15mA LED - 100 TEMPERATURE (°C) MAX8595X toc06 2V/div 0 100mA/div 0 40mA/div 0 10V/div 0 20ms/div = +25°C, ...

Page 5

... IC reenters soft-start. Connect a 0.1µF ceramic capacitor is one diode drop below V OUT / 5 or 0.330V (0.343V for the MAX8596X), whichever is lower. CTRL = 0.1µ 13Ω, 4 LEDs, T COMP SENSE DIRECT-PWM DIMMING RESPONSE MAX8595X toc08 2V/div 32kHz 50% DUTY CYCLE 0 20mV/div AC-COUPLED 0 500mV/div AC-COUPLED ...

Page 6

... T Derating Option for White LEDs A Detailed Description The high efficiency and small size of the MAX8595X/ MAX8596X make them ideally suited to drive up to nine series-connected LEDs. These devices operate as a boost DC-DC converter that regulates output current rather than voltage. The MAX8595X/MAX8596X provide ...

Page 7

... High-Efficiency, 36V Step-Up Converters with T Derating Option for White LEDs A Design Procedure Adjusting LED Current Adjusting the output current of the MAX8595X/ MAX8596X changes the brightness of the LEDs. An analog input (CTRL) and the sense-resistor value set the output current. Output current is given by ...

Page 8

High-Efficiency, 36V Step-Up Converters with T Derating Option for White LEDs A (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.) PIN 1 ...

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