ADP8870 Analog Devices, ADP8870 Datasheet

ADP8870

Manufacturer Part Number

ADP8870

Description

Charge Pump Parallel Backlight Driver with Image Content PWM Input

Manufacturer

Analog Devices

Datasheet

1.ADP8870.pdf (2 pages)

Specifications of ADP8870

Vin Range

2.5 to 5.5V

Vout (v)

4.3 to 5.5

Synchronous

Package

20-Lead LFCSP,20-Lead WLCSP

Led Configuration

Parallel

Topology

Capacitive

I2c Support

Yes

Max Iout (ma)

60mA

Brightness Control

I2C

Peak Efficiency (%)

89%

Switching Frequency

1.2MHz

Over Volt Protection (v)

5.8V

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

H&T Electronics

Part Number:

ADP8870ACPZ-R7

Quantity:

184

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FEATURES

Charge pump with automatic gain selection of 1×, 1.5×, and

Two high accuracy (±5%) phototransistor inputs for

5 programmable ambient light-sensing zones for optimal

Independent ALS control of D7, for automated response of

PWM input can be used for content adaptive brightness

PWM input scales the LED output current

7 independent, programmable LED drivers

Programmable maximum current limit (128 levels)

Standby mode for <1 μA current consumption

16 programmable fade-in and fade-out times (0.1 sec to 5.5 sec)

Fading override

Dedicated reset pin and built-in power-on reset (POR)

Short-circuit, overvoltage, and overtemperature protection

Internal soft start to limit inrush currents

Input-to-output isolation during faults or shutdown

Operates down to V

Available in a small, 2.15 mm × 2.36 mm × 0.6 mm wafer level

GENERAL DESCRIPTION

The ADP8870 combines a programmable backlight LED

charge-pump driver with automatic phototransistor control of

the brightness (LED current) and a PWM input to control the

scale of the output current. This combination allows significant

power savings because it automatically changes the current

intensity based on the sensed ambient lighting levels and the

display image content. It performs this function automatically,

eliminating the need for a processor to monitor the photo-

transistor. The light intensity thresholds are fully programmable

via the I

The ADP8870 allows up to six LEDs to be independently driven up

to 30 mA (maximum). An additional seventh LED can be driven to

For more information about the ADP8870, including the complete data sheet, contact your local Analog Devices, Inc., sales office at

www.analog.com/sales.

Rev. Sp0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

C-compatible interface for all programming

6 drivers capable of 30 mA (maximum)

1 driver capable of 60 mA (maximum)

2× for maximum efficiency

automated ambient light sensing (ALS)

backlight power savings

keypad lighting to ambient light levels

control (CABC) of any, or all, of the LEDs

with choice of square or cubic rates

(UVLO) at 2.0 V.

chip scale package (WLCSP) or a 4 mm × 4 mm × 0.75 mm

lead frame chip scale package (LFCSP)

C interface.

= 2.5 V, with undervoltage lockout

Charge-Pump, Parallel Backlight Driver

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

APPLICATIONS

Mobile display backlighting

Mobile phone keypad backlighting

RGB LED lighting

LED indication

General backlighting of small format displays

60 mA (maximum). All LEDs are individually programmable for

minimum/maximum current and fade-in/fade-out times through

an I

to reduce the processor instructions during fade-in and fade-out.

Driving these components is a two-capacitor charge pump

with gains of 1×, 1.5×, and 2×. This setup is capable of driving a

maximum I

suite of safety features, including short-circuit, overvoltage, and

overtemperature protection, allows easy implementation of a

safe and robust design. Additionally, input inrush currents are

limited via an integrated soft start combined with controlled

input-to-output isolation.

nRST

PWM

nINT

SDA

SCL

C interface. These LEDs can also be combined into groups

VDDIO

with Image Content PWM Input

1µF

OUT

TYPICAL OPERATING CIRCUIT

of 240 mA from a supply of 2.5 V to 5.5 V. A full

Figure 1.

OUT

ADP8870

PHOTOSENSOR

OPTIONAL

D7 CMP_IN

ADP8870

www.analog.com

DD_ALS

PHOTO-

SENSOR

C1+

C1–

C2+

C2–

GND

0.1µF

1µF

OUT

1µF

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ADP8870 Summary of contents

Page 1

... C interface. The ADP8870 allows up to six LEDs to be independently driven (maximum). An additional seventh LED can be driven to For more information about the ADP8870, including the complete data sheet, contact your local Analog Devices, Inc., sales office at www.analog.com/sales. Rev. Sp0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use ...

Page 2

... ADP8870 OUTLINE DIMENSIONS BALL 1 IDENTIFIER (BALL SIDE DOWN) 0.645 0.600 0.555 SEATING PLANE PIN 1 INDICATOR 0.80 0.75 0.70 SEATING PLANE Figure 4. Tape and Reel Orientation for WLCSP Units ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. ...

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