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MAX8595ZETA+T

P1-P3P4-P6P7-P9P10-P10
General Description
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.
Applications
Cell Phones and Smart Phones
PDAs, Palmtops, and Wireless Handhelds
e-Books and Subnotebooks
White LED Display Backlighting
Features
♦ Up to Nine LEDs at 25mA
♦ Temperature Derating Function to Allow Fewer
LEDs for Same Light (MAX8596X)
♦ 86% Efficiency (P
LEDs
/ P
IN
)
♦ 1.7% Current-Regulation Accuracy
♦ Output Overvoltage Protection
♦ Flexible Dimming Control
Analog
Direct-PWM Internal Filter
♦ 1MHz PWM Switching Frequency
♦ 0.1µF Output Capacitor
♦ 12mV
P-P
Low Input Ripple
♦ Soft-Start Eliminates Inrush Current
♦ 2.6V to 6V Input Range
♦ 0.3µA Shutdown Current
♦ Pin Compatible with the MAX1561 and MAX1599
♦ TDFN 3mm x 3mm x 0.8mm Package with
Exposed Paddle
MAX8595X/MAX8596X
High-Efficiency, 36V Step-Up Converters
with T
A
Derating Option for 2 to 9 White LEDs
________________________________________________________________ Maxim Integrated Products 1
GND
COMP
CS
1
2
LX
PGND
IN
CTRL
OUT
TOP VIEW
3
4
MAX8595X
MAX8596X
8
76
5
TDFN
3mm x 3mm x 0.8mm
A "+" SIGN WILL REPLACE THE FIRST
PIN INDICATOR ON LEAD-FREE PACKAGES.
Pin Configuration
Ordering Information
MAX8595X
MAX8596X
IN LX
OUT
PGND
CS
CTRL
COMP
GND
0.1µF
2 TO 9 LEDs
200Hz TO 200kHz
ANALOG OR
PWM DIMMING
2.2µF
INPUT
2.6V TO 6V
OUTPUT
UP TO 38V
Typical Operating Circuit
19-3485; Rev 2; 7/06
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX8595XETA-T -40°C to +85°C
8 TDFN-EP*
T833-1
MAX8595XETA+T -40°C to +85°C 8 TDFN-EP* T833-1
MAX8596XETA-T -40°C to +85°C 8 TDFN-EP* T833-1
MAX8596XETA+T -40°C to +85°C 8 TDFN-EP* T833-1
Dual Mode is a trademark of Maxim Integrated Products, Inc.
+Denotes lead-free package. T = Tape and reel.
*EP = Exposed paddle.
MAX8595X/MAX8596X
High-Efficiency, 36V Step-Up Converters
with T
A
Derating Option for 2 to 9 White LEDs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN to GND .................................................................-0.3V to +7V
PGND to GND .......................................................-0.3V to +0.3V
LX, OUT to GND .....................................................-0.3V to +40V
CTRL to GND...................-0.3V to the lower of +6V or (V
IN
+ 2V)
COMP ..........................................................-0.3V to (V
IN
+ 0.3V)
I
LX
...................................................................................1.0A
RMS
I
CS
........................................................25mA (V
CS
< V
IN
+ 1.2V)
CS to GND ...................................................-0.3V to (V
IN
+ 1.2V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin TDFN 3mm x 3mm
(derate 24.4mW/°C above +70°C)............................ 1950mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
IN
= 3.0V, L = 22µH, C
IN
= 2.2µF, C
OUT
= 0.1µF, C
COMP
= 0.1µF, R
SENSE
= 13Ω, V
CTRL
= 1.5V, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage 2.6 6.0 V
UVLO Threshold V
IN
rising or falling 2.10 2.38 2.55 V
UVLO Hysteresis 30 mV
Quiescent Current No switching 0.5 0.7 mA
T
A
= +25°C 0.3 2
Shutdown Supply Current
CTRL = GND,
V
OUT
= V
IN T
A
= +85°C1
µA
OVLO Threshold V
OUT
rising 36 38 40 V
OVLO Hysteresis 2V
V
OUT
= 32V, V
CTRL
> 0.24V 9 20 35
T
A
= +25°C 0.01 1
OUT Input Bias Current
OUT = IN, CTRL = GND
T
A
= +85°C 0.1
µA
Output Voltage Range (Note 2)
V
IN
-
V
D
36 V
ERROR AMPLIFIER
T
A
= +25°C 0.295 0.300 0.305
T
A
= 0°C to +85°C 0.292 0.300 0.308CTRL to CS Regulation
V
CTRL
= 1.50V,
V
IN
= 2.6V to 5.5V
T
A
= -40°C to +85°C 0.290 0.300 0.310
V
T
A
= +25°C 0.01 1
CS Input Bias Current V
CS
= V
CTRL
/ 5
T
A
= +85°C 0.03
µA
MAX8595X, V
CTRL
= 3.0V 310 330 347
T
A
= -40°C to +25°C 330 345 360
T
A
= +42°C 343
CS Maximum Brightness Clamp
Voltage
MAX8596X,
V
CTRL
= 3.0V
T
A
= +85°C 106.5
mV
MAX8595Z 1.65
CTRL Voltage for CS Maximum
Brightness Clamp
MAX8596Z 1.72
V
CS Derating Function Start
Temperature
MAX8596Z, V
CTRL
= 3.0V +42 °C
MAX8595X/MAX8596X
High-Efficiency, 36V Step-Up Converters
with T
A
Derating Option for 2 to 9 White LEDs
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.0V, L = 22µH, C
IN
= 2.2µF, C
OUT
= 0.1µF, C
COMP
= 0.1µF, R
SENSE
= 13Ω, V
CTRL
= 1.5V, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
CS Derating Function Slope MAX8596X, V
CTRL
= 3.0V, T
A
= +42°C to +85°C -5.5 mV/°C
CTRL Input Resistance V
CTRL
< 1.5V 250 500 780 kΩ
CTRL Dual-Mode Threshold 100 170 240 mV
CTRL Dual-Mode Hysteresis 5mV
CTRL Shutdown Enable Delay (Note 3) 6.0 8.2 10.5 ms
CS to COMP Transconductance V
COMP
= 1.5V 32 50 82 µS
COMP Input Resistance to
Ground
In shutdown, UVLO or OVLO 20 kΩ
OSCILLATOR
Operating Frequency 0.75 1.0 1.25 MHz
PWM mode 12
Minimum Duty Cycle
Pulse skipping 0
%
Maximum Duty Cycle CTRL = IN, CS = GND 94 95 %
n-CHANNEL SWITCH
LX On-Resistance I
LX
= 190mA 0.8 1.35 Ω
T
A
= +25°C 0.01 5
LX Leakage Current V
LX
= 36V, CTRL = GND
T
A
= +85°C1
µA
LX Current Limit Duty cycle = 90% 500 700 900 mA
Note 1: Parameters are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are regulated by
design and characterization.
Note 2: V
D
is the forward-voltage drop of the Schottky diode in Figure 1.
Note 3: Time from CTRL going below the Dual-Mode threshold to IC shutdown.
P1-P3P4-P6P7-P9P10-P10

MAX8595ZETA+T

Mfr. #:
Buy MAX8595ZETA+T
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers 36V Step-Up Converter
Lifecycle:
New from this manufacturer.
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