MAX1576ETG+ Maxim Integrated Products, MAX1576ETG+ Datasheet

MAX1576ETG+

Manufacturer Part Number

MAX1576ETG+

Description

IC LED DRVR WHITE BCKLGT 24-TQFN

Manufacturer

Maxim Integrated Products

Type

Backlight, White LED (Serial Interface)r

Datasheet

1.MAX1576ETGT.pdf (14 pages)

Specifications of MAX1576ETG+

Constant Current

Yes

Topology

Linear (LDO), PWM, Switched Capacitor (Charge Pump)

Number Of Outputs

Internal Driver

Yes

Type - Primary

Backlight, Flash/Torch

Type - Secondary

White LED

Frequency

1MHz

Voltage - Supply

2.7 V ~ 5.5 V

Voltage - Output

Mounting Type

Surface Mount

Package / Case

24-TQFN Exposed Pad

Operating Temperature

-40°C ~ 85°C

Current - Output / Channel

30mA, 100mA

Internal Switch(s)

Yes

Efficiency

85%

Number Of Segments

Low Level Output Current

100 mA

Operating Supply Voltage

2.7 V to 5.5 V

Maximum Supply Current

6 mA

Maximum Power Dissipation

1666 mW

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Minimum Operating Temperature

- 40 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 14
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The MAX1576 charge pump drives up to 8 white LEDs

with regulated constant current for uniform intensity.

The main group of LEDs (LED1–LED4) can be driven

up to 30mA per LED for backlighting. The flash group

of LEDs (LED5–LED8) are independently controlled and

can be driven up to 100mA per LED (or 400mA total).

By utilizing adaptive 1x/1.5x/2x charge-pump modes

and very-low-dropout current regulators, the MAX1576

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

tery voltage range. The 1MHz fixed-frequency switch-

ing allows for tiny external components, and the

regulation scheme is optimized to ensure low EMI and

low input ripple.

The MAX1576 uses two external resistors to set the

main and flash full-scale (100%) LED currents. Four

control pins are used for LED dimming by either serial

control or 2-bit logic per group. ENM1 and ENM2 set

the main LEDs to 10%, 30%, or 100% of full scale.

ENF1 and ENF2 set the flash LEDs to 20%, 40%, or

100% of full scale. In addition, connect either pair of

control pins together for single-wire, serial pulse dim-

ming control.

The MAX1576 is available in a 24-pin thin QFN, 4mm x

4mm package (0.8mm max height).

19-3326; Rev 1; 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.

480mA White LED 1x/1.5x/2x Charge Pump for

Camera Phones

LCD Backlights

LED Camera Flashes

Cell Phones and Smart Phones

PDAs, Digital Cameras, and Camcorders

________________________________________________________________ Maxim Integrated Products

General Description

INPUT

2.7V TO 5.5V

4.7μF

ON/OFF AND

CURRENT

SETTING

1μF

Applications

INP

GND1

ENM1

ENM2

ENF1

ENF2

Backlighting and Camera Flash

SETM

C1P

1μF

SETF

C1N

MAX1576Y

GND2

C2P

1μF

C2N

PGND

♦ Powers Up to 8 LEDs

♦ 85% Average Efficiency (P

♦ 0.7% Typical LED Current Matching

♦ Adaptive 1x/1.5x/2x Mode Switchover

♦ Flexible Brightness Control

♦ Low Input Ripple and EMI

♦ Low 0.1µA Shutdown Current

♦ 2.7V to 5.5V Supply Voltage Range

♦ Soft-Start Limits Inrush Current

♦ Output Overvoltage Protection

♦ Thermal-Shutdown Protection

♦ 24-Pin Thin QFN, 4mm x 4mm Package

+ Denotes lead-free package.

Pin Configuration appears at end of data sheet.

MAX1576ETG

MAX1576ETG+

Battery Discharge

LED1

LED2

LED3

LED4

LED5

LED6

LED7

LED8

OUT

Up to 30mA/LED Drive for Backlight

Up to 400mA Total Drive for Flash

Single-Wire, Serial Pulse Interface (5% to 100%)

2-Bit (3 Levels) Logarithmic Logic

PART

OUTPUT

UP TO 480mA

4.7μF

Typical Operating Circuit

-40°C to +85°C

TEMP RANGE

MAIN

Ordering Information

FLASH

LED

/ P

PIN-PACKAGE

24 Thin QFN 4mm x

4mm (T2444-4)

24 Thin QFN 4mm x

4mm (T2444-4)

BATT

Features

) Over Li+

Related parts for MAX1576ETG+

MAX1576ETG+ Summary of contents

Page 1

... Supply Voltage Range ♦ Soft-Start Limits Inrush Current ♦ Output Overvoltage Protection ♦ Thermal-Shutdown Protection ♦ 24-Pin Thin QFN, 4mm x 4mm Package Applications PART MAX1576ETG MAX1576ETG+ + Denotes lead-free package. Pin Configuration appears at end of data sheet. 1μF 1μF OUTPUT UP TO 480mA C1P ...

Page 2

White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash ABSOLUTE MAXIMUM RATINGS INP, IN, OUT, ENM1, ENM2, ENF1, ENF2 to GND1 .......................................................-0.3V to +6.0V SETF, SETM, LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 to GND1 ....................-0.3V to ...

Page 3

White LED 1x/1.5x/2x Charge Pump for ELECTRICAL CHARACTERISTICS (continued 3.6V GND1 GND2 PGND unless otherwise noted. Typical values are at T PARAMETER LED_ Leakage in Shutdown ENM1 = ENM2 = ENF1 ...

Page 4

White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash (V = 3.6V, EN_ = IN, Circuit of Figure EFFICIENCY vs. Li+ BATTERY VOLTAGE DRIVING FOUR MAIN LEDs 100 90 15mA/LED 80 4.5mA/LED 70 1.5mA/LED 60 ...

Page 5

White LED 1x/1.5x/2x Charge Pump for (V = 3.6V, EN_ = IN, Circuit of Figure LED CURRENT vs. R 100 10 100% BRIGHTNESS SETTING SETM OPERATING WAVEFORMS (1x MODE) V OUT V ...

Page 6

White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash (V = 3.6V, EN_ = IN, Circuit of Figure SINGLE-WIRE DIMMING RESPONSE V , EN1M V EN2M I OUT V OUT 2ms/div PIN NAME Output. Bypass ...

Page 7

... When the input voltage rises above two- thirds V by approximately 50mV, the MAX1576 OUT switches back to 1.5x mode. True Shutdown is a trademark of Maxim Integrated Products, Inc. _______________________________________________________________________________________ Backlighting and Camera Flash Pin Description (continued) FUNCTION The MAX1576 includes soft-start circuitry to limit inrush current at turn-on ...

Page 8

White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash INPUT 2.7V TO 5.5V INP 4.7μF C2 1μF PGND CONTROL AND ENM1 REFERENCE ENM2 0.15V ENF1 FLASH CONTROL ENF2 MAIN CONTROL 0.604V IN ERROR AMP 2 ...

Page 9

White LED 1x/1.5x/2x Charge Pump for 1μF 1μF INPUT C1P C1N C2P C2N 2.7V TO 5.5V INP OUT IN 4.7μF 1μF PGND MAX1576 LED1 GND1 LED2 LED3 LED4 ENM1 LED5 ENM2 ON/OFF AND LED6 CURRENT SETTING ENF1 LED7 ENF2 ...

Page 10

White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash INPUT 2.7V TO 5.5V 4.7μF 1μF ON OFF PWM INPUT ON/OFF AND CURRENT SETTING Figure 4. Dimming Using PWM Signal into ENM1 INPUT 2.7V TO 5.5V 4.7μF 1μF ON/OFF ...

Page 11

White LED 1x/1.5x/2x Charge Pump for INPUT 2.7V TO 5.5V 4.7μF 1μF ON/OFF AND CURRENT SETTING Figure 6. Providing Increased LED Current per LED INPUT 2.7V TO 5.5V 4.7μF 1μF ON/OFF AND CURRENT SETTING Figure 7. Schematic for when ...

Page 12

White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash Table 3. Recommended Components DESIGNATION VALUE MANUFACTURER 4.7µF IN OUT C2, C3, C4 1µF D1–D4 — D5 (D5–D8) — required SETM SETF ...

Page 13

White LED 1x/1.5x/2x Charge Pump for (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Backlighting and Camera Flash Package Information PACKAGE OUTLINE, 12, ...

Page 14

... 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. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Package Information (continued) Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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