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ADP8870 数据表(PDF) 1 Page - Analog Devices

部件名 ADP8870
功能描述  Charge-Pump, Parallel Backlight Driver with Image Content PWM Input
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADP8870 数据表(HTML) 1 Page - Analog Devices

  ADP8870 Datasheet HTML 1Page - Analog Devices ADP8870 Datasheet HTML 2Page - Analog Devices  
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Charge-Pump, Parallel Backlight Driver
with Image Content PWM Input
ADP8870
Rev. Sp0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.
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 of D7, for automated response of
keypad lighting to ambient light levels
PWM input can be used for content adaptive brightness
control (CABC) of any, or all, of the LEDs
PWM input scales the LED output current
7 independent, programmable LED drivers
6 drivers capable of 30 mA (maximum)
1 driver capable of 60 mA (maximum)
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)
with choice of square or cubic rates
Fading override
I2C-compatible interface for all programming
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 VIN = 2.5 V, with undervoltage lockout
(UVLO) at 2.0 V.
Available in a small, 2.15 mm × 2.36 mm × 0.6 mm wafer level
chip scale package (WLCSP) or a 4 mm × 4 mm × 0.75 mm
lead frame chip scale package (LFCSP)
APPLICATIONS
Mobile display backlighting
Mobile phone keypad backlighting
RGB LED lighting
LED indication
General backlighting of small format displays
TYPICAL OPERATING CIRCUIT
D1
D2
D3
D4
D5
D6
D7
CMP_IN
VOUT
OPTIONAL
PHOTOSENSOR
PHOTO-
SENSOR
VDD_ALS
0.1µF
0.1µF
VIN
1µF
GND
C2+
C2–
C2
1µF
C1+
C1–
C1
1µF
VOUT
1µF
ADP8870
nINT
PWM
SDA
SCL
VDDIO
nRST
Figure 1.
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 I2C interface.
The ADP8870 allows up to six LEDs to be independently driven up
to 30 mA (maximum). An additional seventh LED can be driven to
60 mA (maximum). All LEDs are individually programmable for
minimum/maximum current and fade-in/fade-out times through
an I2C interface. These LEDs can also be combined into groups
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 IOUT of 240 mA from a supply of 2.5 V to 5.5 V. A full
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.
For more information about the ADP8870, including the complete data sheet, contact your local Analog Devices, Inc., sales office at
www.analog.com/sales.


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