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PDF MAX8595X Data sheet ( Hoja de datos )
| Número de pieza | MAX8595X | |
| Descripción | High-Efficiency 36V Step-Up Converters | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX8595X (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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19-3485; Rev 0; 11/04
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
High-Efficiency, 36V Step-Up Converters
with TA Derating Option for 2 to 9 White LEDs
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
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
INPUT
2.6V TO 5.5V
2.2µF
OUTPUT
UP TO 38V
ANALOG OR
PWM DIMMING
200Hz TO 200kHz
IN LX
OUT
MAX8595X
CTRL MAX8596X PGND
COMP
GND
CS
0.1µF
2 TO 9 LEDs
Features
♦ Up to Nine LEDs at 25mA
♦ Temperature Derating Function to Allow Fewer
LEDs for Same Light (MAX8596X)
♦ 86% Efficiency (PLEDs / PIN)
♦ 1.7% Current-Regulation Accuracy
♦ Output Overvoltage Protection
♦ Flexible Dimming Control
Analog
Direct-PWM Internal Filter
♦ 1MHz PWM Switching Frequency
♦ 0.1µF Output Capacitor
♦ 12mVP-P Low Input Ripple
♦ 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
Exposed Paddle
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
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.
Pin Configuration
TOP VIEW
8 7 65
MAX8595X
MAX8596X
1 2 34
TDFN
3mm x 3mm x 0.8mm
________________________________________________________________ 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  
www.DataSheet4U.com
High-Efficiency, 36V Step-Up Converters
with TA Derating Option for 2 to 9 White LEDs
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 3.6V, ILED = 25mA, L = 22µH, CIN = 2.2µF, COUT = 0.1µF, CCOMP = 0.1µF, RSENSE = 13Ω, 4 LEDs, TA = +25°C,
unless otherwise noted.)
VCTRL
IIN
ILED
VOUT
CTRL STEP RESPONSE
MAX8595X toc07
1V/div
0
100mA/div
0
20ms/div
40mA/div
0
10V/div
0
VCTRL
VIN
VOUT
ILED
DIRECT-PWM DIMMING RESPONSE
MAX8595X toc08
2V/div
32kHz 50%
DUTY CYCLE
0
20mV/div
AC-COUPLED
0
500mV/div
AC-COUPLED
0
10µs/div
10mA/div
0
Pin Description
PIN NAME
FUNCTION
Overvoltage Sense. When VOUT is greater than 38V (typ), the internal n-channel MOSFET turns off
1
OUT
until VOUT drops below 36V (typ), then the IC reenters soft-start. Connect a 0.1µF ceramic capacitor
from OUT to ground. In shutdown, VOUT is one diode drop below VIN.
2
IN
Input Voltage Supply. The input voltage range is 2.6V to 5.5V. Connect a 2.2µF ceramic capacitor
from IN to GND.
Brightness Control Input. The voltage applied to CTRL controls LED brightness. Varying the voltage
from 0.24V to 1.65V (1.72V for the MAX8596X) adjusts the brightness from dim to 100% brightness,
3
CTRL
respectively. Any voltage above 1.65V (1.72V) does not increase brightness. Hold CTRL below
100mV to shut down the IC after an 8.2ms delay.
4
CS
Current-Sense Feedback Input. Connect a resistor from CS to GND to set the LED bias current. The
voltage at CS regulates to VCTRL / 5 or 0.330V (0.343V for the MAX8596X), whichever is lower.
Compensation Input. Connect a 0.1µF ceramic capacitor (CCOMP) from COMP to GND. CCOMP
5 COMP stabilizes the converter, controls soft-start, and lowpass filters direct PWM dimming at CTRL. CCOMP
discharges to 0V through an internal 20kΩ resistor in shutdown.
6
GND
Ground. Connect to PGND and the exposed pad directly under the IC.
7 PGND Power Ground. Connect to GND and the exposed pad directly under the IC.
8 LX Inductor Connection. Connect LX to the node between the inductor and the Schottky diode. LX is
high impedance in shutdown.
—
EP
Exposed Pad. Connect to a large ground plane for maximum package heat dissipation. Connect
directly to GND and PGND under the IC.
_______________________________________________________________________________________ 5
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| PDF Descargar | [ Datasheet MAX8595X.PDF ] | |
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