MAX1575ETE/V+T Maxim Integrated, MAX1575ETE/V+T Datasheet

MAX1575ETE/V+T

Manufacturer Part Number

MAX1575ETE/V+T

Description

LED Lighting Drivers White LED 1x/1.5x Charge Pump for Main and Sub-Displays

Manufacturer

Maxim Integrated

Datasheet

1.MAX1575ETEVT.pdf (9 pages)

Specifications of MAX1575ETE/V+T

Input Voltage

2.7 V to 5.5 V

Maximum Supply Current

2 mA

Power Dissipation

1349 mW

Current page: 1 of 9
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The MAX1575 charge pump drives up to four white

LEDs in the main display and up to two white LEDs in

the sub-display with regulated constant current for uni-

form intensity. By utilizing adaptive 1x/1.5x charge-

pump modes and very-low-dropout current regulators,

it achieves high efficiency over the full 1-cell lithium-

battery input voltage range. A 1MHz fixed-frequency

switching allows for tiny external components, and the

regulation scheme is optimized to ensure low EMI and

low input ripple.

The MAX1575 uses an external resistor to set the full-

scale 100% LED current. Two enable inputs, ENM and

ENS, are used for simple on/off controls for the main and

sub-displays, respectively. By repeatedly pulsing either

enable input, the LEDs can be dimmed in multiple steps

down to 5%. Once the desired brightness is set, the

MAX1575 maintains that brightness setting as long as

the enable input is kept high. If an enable input is kept

low for more than 2ms, the LED current for the respec-

tive display is set to zero. If both enable inputs are kept

low for more than 2ms, the MAX1575 enters shutdown.

The MAX1575 is available in a 16-pin 4mm x 4mm thin

QFN package (0.8mm max height).

19-3097; Rev 2; 8/05

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.

Cell Phones with Main and Sub-Displays

PDAs/Smart Phones with Up to Six White LEDs

TOP VIEW

C1N 13

C2N 15

C1P 16

IN 14

________________________________________________________________ Maxim Integrated Products

4mm x 4mm

THIN QFN

General Description

MAX1575

Pin Configuration

Applications

White LED 1x/1.5x Charge Pump

LED4

LED5

LED6

ENM

for Main and Sub-Displays

♦ Powers Main and Sub-Display LEDs

♦ 85% Average Efficiency (P

♦ 2% LED Current Matching

♦ Up to 30mA/LED Drive Capability

♦ Adaptive 1x/1.5x Mode Switchover

♦ Low Input Ripple and EMI

♦ Individual 5% to 100% Dimming Through

♦ Low 0.1µA Shutdown Current

♦ 2.7V to 5.5V Supply Voltage Range

♦ Soft-Start Limits Inrush Current

♦ Output-Overvoltage Protection

♦ Thermal-Shutdown Protection

♦ 16-Pin Thin QFN 4mm x 4mm Package

+ Denotes lead-free package.

MAX1575ETE

MAX1575ETE+

Battery Discharge

Single-Wire Serial Pulse Interface

PART

2.7V TO 5.5V

AND DIMMING

ENABLE MAIN

ENABLE SUB

1μF

ON/OFF

SET

Typical Operating Circuit

-40°C to +85°C

TEMP RANGE

GND

ENM

ENS

SET

Ordering Information

C1P

C2P

MAX1575

1μF

C1N

C2N

LED

LED1

LED2

LED3

LED4

LED5

LED6

OUT

PIN-PACKAGE

16 Thin QFN 4mm x 4mm

/ P

BATT

Features

1μF

MAIN

) Over Li+

SUB

Related parts for MAX1575ETE/V+T

MAX1575ETE/V+T Summary of contents

Page 1

... THIN QFN 4mm x 4mm ________________________________________________________________ Maxim Integrated Products 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. White LED 1x/1.5x Charge Pump for Main and Sub-Displays ♦ Powers Main and Sub-Display LEDs ♦ ...

Page 2

White LED 1x/1.5x Charge Pump for Main and Sub-Displays ABSOLUTE MAXIMUM RATINGS IN, OUT, ENM, ENS to GND..................................-0.3V to +6.0V SET, LED_, C1N, C2N to GND.....................-0. C1P, C2P to GND.............................................................-0.3V to the greater of (V OUT OUT Short ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 3.6V 0V, ENM = ENS = IN GND noted. Typical values are +25°C.) (Note 1) A PARAMETER t (ENM, ENS) (Figure (ENM, ENS) (Figure 1) ...

Page 4

White LED 1x/1.5x Charge Pump for Main and Sub-Displays (V = 3.6V, ENM = ENS = IN, circuit of Figure OUTPUT CURRENT vs. SUPPLY VOLTAGE DRIVING SIX LEDs AT 20mA EACH 123 122 121 120 119 118 ...

Page 5

PIN NAME 1 C2P Transfer-Capacitor 2 Positive Connection. Connect a 1µF ceramic capacitor from C2P to C2N. Output. Connect a 1µF ceramic capacitor from OUT to GND. Connect OUT to the anodes of all the LEDs. 2 OUT OUT is ...

Page 6

White LED 1x/1.5x Charge Pump for Main and Sub-Displays Setting the Output Current The LED current at full (100%) brightness is set (up to 30mA resistor follows: SET × 234 = ...

Page 7

C1P 2. 1μF GND CONTROL AND REFERENCE ENM MAIN ENABLE 0.18V AND DIMMING SUB CONTROL ENS SUB ENABLE MAIN CONTROL AND DIMMING 0.6V CONTROLLED CURRENT MIRROR ERROR AMP2 SET R SET Figure 2. Functional Diagram ...

Page 8

White LED 1x/1.5x Charge Pump for Main and Sub-Displays 1μF C1P C1N 2.7V TO 5.5V IN OUT 1μF MAX1575 GND LED1 ENABLE MAIN LED2 ON/OFF ENM AND DIMMING LED3 ENABLE SUB LED4 ON/OFF ENS AND DIMMING LED5 SET LED6 R ...

Page 9

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2005 Maxim Integrated Products White LED 1x/1 ...

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