MAX8595XETA-T 查看數據表（PDF） - Maxim Integrated

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MAX8595XETA-T

High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs

Maxim Integrated 

19-3485; Rev 2; 7/06

EVAALVUAAILTAIOBNLEKIT

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 6V

2.2µF

OUTPUT

UP TO 38V

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 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

Ordering Information

PART

TEMP RANGE PIN-

PACKAGE

PKG

CODE

MAX8595XETA-T

MAX8595XETA+T

MAX8596XETA-T

MAX8596XETA+T

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

8 TDFN-EP*

8 TDFN-EP*

8 TDFN-EP*

8 TDFN-EP*

T833-1

T833-1

T833-1

T833-1

+Denotes lead-free package.

*EP = Exposed paddle.

T = Tape and reel.

Pin Configuration

TOP VIEW

8 7 65

ANALOG OR

PWM DIMMING

200Hz TO 200kHz

IN

LX

OUT

MAX8595X

CTRL MAX8596X PGND

COMP

GND

CS

0.1µF

2 TO 9 LEDs

MAX8595X

MAX8596X

1 2 34

TDFN

3mm x 3mm x 0.8mm

A "+" SIGN WILL REPLACE THE FIRST

PIN INDICATOR ON LEAD-FREE PACKAGES.

________________________________________________________________ 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.

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