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General Description

The MAX8595Z/MAX8596Z drive up to 8 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

MAX8595Z regulates constant LED current over the

entire temperature range. The MAX8596Z 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 MAX8595Z/MAX8596Z 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 8 LEDs at 25mA

♦ Temperature Derating Function to Allow Fewer

LEDs for Same Light (MAX8596Z)

♦ 86% Efficiency (P

LEDs

/ P

)

♦ 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 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

MAX8595Z/MAX8596Z

High-Efficiency, 32V Step-Up Converters

with T

Derating Option for 2 to 8 White LEDs

________________________________________________________________ Maxim Integrated Products 1

GND

COMP

PGND

CTRL

OUT

TOP VIEW

MAX8595Z

MAX8596Z

TDFN

3mm x 3mm x 0.8mm

Pin Configuration

Ordering Information

MAX8595Z

MAX8596Z

IN LX

OUT

PGND

CTRL

COMP

GND

0.1µF

2 TO 8 LEDs

200Hz TO 200kHz

ANALOG OR

PWM DIMMING

2.2µF

INPUT

2.6V TO 5.5V

OUTPUT

UP TO 34V

Typical Operating Circuit

19-3558; Rev 0; 8/04

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

MAX8595ZETA

-40°C to +85°C

8 TDFN 3mm x 3mm

T833-1

MAX8596ZETA

-40°C to +85°C

8 TDFN 3mm x 3mm

T833-1

Dual Mode is a trademark of Maxim Integrated Products, Inc.

1 2 3 4 5 6 7 8

MAX8595Z/MAX8596Z 1

Indice de contenidos

Pagina 1 - MAX8595Z/MAX8596Z

General DescriptionThe MAX8595Z/MAX8596Z drive up to 8 white LEDswith constant current and high efficiency to provideLCD backlighting in cell phones,

Pagina 2

MAX8595Z/MAX8596ZHigh-Efficiency, 32V Step-Up Converterswith TADerating Option for 2 to 8 White LEDs2 ________________________________________________

Pagina 3

MAX8595Z/MAX8596ZHigh-Efficiency, 32V Step-Up Converterswith TADerating Option for 2 to 8 White LEDs__________________________________________________

Pagina 4

MAX8595Z/MAX8596ZHigh-Efficiency, 32V Step-Up Converterswith TADerating Option for 2 to 8 White LEDs4 ________________________________________________

Pagina 5

MAX8595Z/MAX8596ZHigh-Efficiency, 32V Step-Up Converterswith TADerating Option for 2 to 8 White LEDs__________________________________________________

Pagina 6

MAX8595Z/MAX8596ZDetailed DescriptionThe high efficiency and small size of the MAX8595Z/MAX8596Z make them ideally suited to drive up to 8series-conne

Pagina 7

Design ProcedureAdjusting LED CurrentAdjusting the output current of the MAX8595Z/MAX8596Z changes the brightness of the LEDs. Ananalog input (CTRL) a

Pagina 8

MAX8595Z/MAX8596ZHigh-Efficiency, 32V Step-Up Converterswith TADerating Option for 2 to 8 White LEDsMaxim cannot assume responsibility for use of any

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Rainbow-electronics MAX8596Z Manual de usuario

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