ADP8870ACPZ-R7 Analog Devices Inc, ADP8870ACPZ-R7 Datasheet

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ADP8870ACPZ-R7

Manufacturer Part Number
ADP8870ACPZ-R7
Description
Charge Pump Based Backlight Controller
Manufacturer
Analog Devices Inc
Series
-r
Datasheet

Specifications of ADP8870ACPZ-R7

Constant Current
-
Constant Voltage
-
Topology
PWM, Switched Capacitor (Charge Pump)
Number Of Outputs
7
Internal Driver
Yes
Type - Primary
Backlight, LED Blinker
Type - Secondary
RGB
Frequency
-
Voltage - Supply
2.5 V ~ 5.5 V
Voltage - Output
-
Mounting Type
Surface Mount
Package / Case
20-WFQFN Exposed Pad, CSP
Operating Temperature
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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Part Number:
ADP8870ACPZ-R7
Quantity:
184
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
I
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.
2
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)
2
C interface.
IN
= 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
2
V
C interface. These LEDs can also be combined into groups
IN
VDDIO
with Image Content PWM Input
1µF
OUT
TYPICAL OPERATING CIRCUIT
D1
of 240 mA from a supply of 2.5 V to 5.5 V. A full
D2
©2010 Analog Devices, Inc. All rights reserved.
D3
Figure 1.
D4
V
OUT
ADP8870
D5
D6
PHOTOSENSOR
OPTIONAL
D7 CMP_IN
ADP8870
www.analog.com
V
DD_ALS
PHOTO-
SENSOR
C1+
C1–
C2+
C2–
GND
0.1µF
0.1µF
1µF
V
OUT
C1
1µF
C2
1µF

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ADP8870ACPZ-R7 Summary of contents

Page 1

FEATURES Charge pump with automatic gain selection of 1×, 1.5×, and 2× for maximum efficiency Two high accuracy (±5%) phototransistor inputs for automated ambient light sensing (ALS) 5 programmable ambient light-sensing zones for optimal backlight power savings Independent ALS control ...

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 ...

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