MAX8822ETE+T Maxim Integrated Products, MAX8822ETE+T Datasheet

MAX8822ETE+T

Manufacturer Part Number

MAX8822ETE+T

Description

IC LED DRVR WHITE BCKLGT 16-TQFN

Manufacturer

Maxim Integrated Products

Type

Backlight, White LEDr

Datasheet

1.MAX8822ETE.pdf (15 pages)

Specifications of MAX8822ETE+T

Constant Current

Yes

Topology

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

Number Of Outputs

Internal Driver

Yes

Type - Primary

Backlight

Type - Secondary

White LED

Frequency

1MHz

Voltage - Supply

2.7 V ~ 5.5 V

Voltage - Output

Mounting Type

Surface Mount

Package / Case

16-TQFN Exposed Pad

Operating Temperature

-40°C ~ 85°C

Current - Output / Channel

24mA

Internal Switch(s)

Yes

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Efficiency

Lead Free Status / Rohs Status

Details

Current page: 1 of 15
Download datasheet (252Kb)

The MAX8822 drives up to four white light-emitting

diodes (LEDs) with regulated constant current for dis-

play backlighting in cell phones, digital cameras, PDAs,

and other handheld devices. By utilizing a proprietary

negative 0.5x inverting charge pump and innovative

independent low-dropout (LDO) adaptive current regu-

lators, very high efficiency is achieved over the full

1-cell Li+ battery voltage range, even with large LED V

mismatch. The 1MHz fixed-frequency switching allows

for tiny external components. The regulation scheme is

optimized to ensure low EMI and low input ripple. Two

200mA, low-noise, high power-supply-rejection-ratio

(PSRR) LDOs with programmable output voltages are

included on-chip to provide power to camera modules

or other devices.

The MAX8822 features a single-wire, serial-pulse control-

logic interface that programs LED current and the output

voltages of the LDOs. The LED dimming range is pseu-

do-logarithmic from 24mA to 0.1mA in 31 steps. LDO

output voltages are programmable in 16 different combi-

nations to meet various camera module requirements.

The MAX8822 includes soft-start, thermal shutdown,

open- and short-circuit protection.

19-0847; Rev 0; 11/07

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim's website at www.maxim-ic.com.

Driver with Dual LDOs in 3mm x 3mm Thin QFN

INTERFACE

CONTROL

SERIAL-

PULSE

White LED Backlighting

Cell Phones and Smartphones

2.7V TO 5.5V

0.1μF

4.7μF

INPUT

Ultra-Efficient Negative Charge-Pump LED

GND

ENLED

ENLDO

REF

Typical Operating Circuit

C1P

________________________________________________________________ Maxim Integrated Products

1μF

C1N

MAX8822

General Description

C2P

1μF

C2N

LED2

LED3

LED4

LDO1

LDO2

LED1

NEG

Applications

UP TO 24mA/LED

1μF

2.2μF

1μF

LDO1

LDO2

♦ High-Efficiency Charge Pump for Up to Four

♦ Dual 200mA Low-Noise, High PSRR LDOs

♦ Flexible Single-Wire Control for Dimming and

♦ Low 0.5µA (typ) Shutdown Mode

♦ Soft-Start Limits Inrush Current

♦ Thermal Shutdown and Open- and Short-Circuit

♦ Tiny 16-Pin, 3mm x 3mm Thin QFN Package

Note: The device is specified over the -40°C to +85°C extend-

ed temperature range.

+ Denotes a lead-free package.

* EP = Exposed paddle.

MAX8822ETE+

White LEDs

LDO Output Voltage

Protection

(0.8mm max Height) with Exposed Paddle

Independent Adaptive Voltage Supply for Each

24mA to 0.1mA Dimming Range

1% (typ) Current Accuracy and 0.3% Current

Low 65µA (typ) Quiescent Current

16 Different Output Voltage Combinations Up to

High 60dB PSRR at 10kHz

PART

TOP VIEW

LED

Matching

3.3V

ENLDO

ENLED

LDO2

REF

PIN-PACKAGE

16 Thin QFN-EP*

(3mm x 3mm)

Ordering Information

(3mm x 3mm)

THIN QFN

MAX8822

Pin Configuration

TOP MARK

AFW

Features

LED4

NEG

C1N

C2N

T1633-5

CODE

PKG

Related parts for MAX8822ETE+T

MAX8822ETE+T Summary of contents

Page 1

... ENLDO REF LDO1 0.1μF LDO2 EP ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. ♦ High-Efficiency Charge Pump for Up to Four White LEDs Independent Adaptive Voltage Supply for Each LED 24mA to 0 ...

Page 2

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN ABSOLUTE MAXIMUM RATINGS IN, C1N, C2N, REF, ENLED, ENLDO, LDO1, LDO2 to GND...............................................................-0.3V to +6.0V IN, REF, ENLED, ENLDO, LDO1, LDO2 to NEG ...............................................................-0.3V to +6.0V ...

Page 3

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN ELECTRICAL CHARACTERISTICS (continued 3.6V 0V -40°C to +85°C, unless otherwise noted. Typical values are GND A PARAMETER ...

Page 4

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN (V = 3.6V Circuit of Typical Operating Circuit , T IN EN_ IN EFFICIENCY vs. SUPPLY VOLTAGE (4 MATCHED WLEDs) 100 90 ...

Page 5

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN (V = 3.6V Circuit of Typical Operating Circuit , T IN EN_ IN LED CURRENT MATCHING vs. SUPPLY VOLTAGE 17.0 16.8 16.6 ...

Page 6

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN (V = 3.6V Circuit of Typical Operating Circuit , T IN EN_ IN LINE-TRANSIENT RESPONSE (NO MODE CHANGE ...

Page 7

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN PIN NAME Supply Voltage Input. Bypass IN to GND with a 4.7µF ceramic capacitor placed as close as possible the IC. The input ...

Page 8

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN ENLED t INIT INTERNAL CURRENT SHDN 24.0mA 22.4mA 20.8mA SETTING I LED_ SHDN Figure 1. Timing Characteristics for LED Serial-Pulse Control Interface ...

Page 9

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN INPUT 2. 4.7μF 5.5V GND REF C2 0.1μF BANDGAP ENLDO ENLED Figure 3. MAX8822 Functional Block Diagram and Application Circuit _______________________________________________________________________________________ ...

Page 10

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN MAX8822 LED NEG CURRENT CONTROL LED_ CURRENT REGULATOR Figure 4. Current Regulator Returning to GND The LED current and LDO output voltages are pro- grammed using ...

Page 11

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN Table 1. ENLED Pulse Count and Programmed LED_ Current ENLED PULSE PROGRAMMED LED_ CURRENT COUNT ...

Page 12

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN Table 3. ENLDO Pulse Count and LDO1 and LDO2 Output Voltage Selection PROGRAMMED ENLDO PULSE LDO1 VOLTAGE COUNT* (V) 0 2.8 2 3.3 3 ...

Page 13

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN resistance and to route heat away from the device. The exposed paddle lowers the thermal resistance of the package by providing a direct-heat conduction path from ...

Page 14

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) E MARKING E/2 ...

Page 15

... 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 ____________________ 15 © 2007 Maxim Integrated Products ...

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