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ADP8860 数据表(PDF) 1 Page - Analog Devices

部件名 ADP8860
功能描述  Charge Pump, 7-Channel Smart LED Driver with I2C Interface
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADP8860 数据表(HTML) 1 Page - Analog Devices

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Charge Pump, 7-Channel
Smart LED Driver with I2C Interface
ADP8860
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalog Devices foritsuse,nor for anyinfringements ofpatents orother
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
©2009 Analog Devices, Inc. All rights reserved.
FEATURES
Charge pump with automatic gain selection of 1×, 1.5×, and
2× for maximum efficiency
Up to two built-in comparator inputs with programmable
modes for ambient light sensing
Outdoor, office, and dark modes for maximum backlight
power savings
7 independent and programmable LED drivers
6 drivers capable of 30 mA (typical)
1 driver capable of 60 mA (typical)
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
Choose from linear, 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
Operation down to VIN = 2.5 V with undervoltage lockout
(UVLO) at VIN = 2.0 V
Small wafer level chip scale package (WLCSP) or lead frame
chip scale package (LFCSP)
APPLICATIONS
Mobile display backlighting
Mobile phone keypad backlighting
Dual RGB backlighting
LED indication
General backlighting of small format displays
GENERAL DESCRIPTION
The ADP8860 combines a programmable backlight LED charge
pump driver with automatic phototransistor control. This combi-
nation allows for significant power savings because it changes the
current intensity in office and dark ambient light conditions. By
performing this function automatically, it eliminates the need for
a processor to monitor the phototransistor.
The light intensity thresholds are fully programmable via the
I2C® interface. A second phototransistor input, with dedicated
comparators, improves the ambient light detection levels for
various user operating conditions.
TYPICAL OPERATING CIRCUIT
V
D3
D1
E3
D2
E4
D3
D4
D4
C4
D5
B4
D6/
CMP_IN2
B3
D7
ALS
VOUT
OPTIONAL
PHOTOSENSOR
PHOTOSENSO
C3
CMP_IN
R
0.1µF
0.1µF
VIN
A3
1µF
E1
VDDIO
nRST
C2
VDDIO
SDA
E2
VDDIO
SCL
D2
VDDIO
nINT
A4
GND1
D1
GND2
B1
C2+
B2
C2–
C2
1µF
A1
C1+
C1
C1–
C1
1µF
VOUT
A2
ADP8860
1µF
Figure 1.
The ADP8860 allows as many as six LEDs to be independently
driven up to 30 mA (typical). A seventh LED can be driven to
60 mA (typical). All LEDs are programmable for minimum/max-
imum current and fade in/out times via the I2C interface. These
LEDs can also be combined into groups to reduce the processor
instructions during fade in/out.
Driving this entire configuration 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. The
device includes a variety of safety features including short-circuit,
overvoltage, and overtemperature protection. These features
allow easy implementation of a safe and robust design. Addi-
tionally, input inrush currents are limited via an integrated soft
start combined with controlled input-to-output isolation.
The ADP8860 is available in two package types, either a compact
2 mm × 2.4 mm × 0.6 mm WLCSP (wafer level chip scale package)
or a small LFCSP (lead frame chip scale package).


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