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PDF ADP8860 Data sheet ( Hoja de datos )
| Número de pieza | ADP8860 | |
| Descripción | 7-Channel Smart LED Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADP8860 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Charge Pump, 7-Channelwww.DataSheet4U.com
Smart LED Driver with I2C Interface
ADP8860
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
VOUT
VALS
OPTIONAL
PHOTOSENSOR
PHOTOSENSOR
0.1µF
VIN
1µF
D1 D2 D3 D4 D5
D7 CMP_IN
D3 E3 E4 D4 C4 B4 B3
C3
A3 D6/
CMP_IN2
VDDIO
A2
0.1µF
VOUT
1µF
nRST
E1
VDDIO
SDA
C2
VDDIO
SCL
E2
VDDIO
ADP8860
A1 C1+
C1–
C1
B1 C2+
C2–
B2
C1
1µF
C2
1µF
nINT
D2
A4
GND1
D1
GND2
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).
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalog Devicesforitsuse,norforanyinfringementsofpatentsorother
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.
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.
1 page  
I2C TIMING DIAGRAM
SDA
tLOW
tR tSU, DAT
tF tF
tHD, STA
SCL
S tHD, DAT
S = START CONDITION
Sr = REPEATED START CONDITION
P = STOP CONDITION
tHIGH
tSU, STA
Sr
Figure 2. I2C Interface Timing Diagram
ADP8860www.DataSheet4U.com
tSP tR
tBUF
tSU, STO
P
S
Rev. 0 | Page 5 of 52
5 Page 
T
VIN (AC-COUPLED) 50mV/DIV
1
VOUT (AC-COUPLED) 50mV/DIV
2
IIN (AC-COUPLED) 10mA/DIV
3
CIN = 1µF, COUT = 1µF, C1 = 1µF, C2 = 1µF
VIN = 3.0V
IOUT = 120mA
500ns/DIV
Figure 23. Typical Operating Waveforms, G = 1.5×
T
VIN (AC-COUPLED) 50mV/DIV
1
VOUT (AC-COUPLED) 50mV/DIV
2
IIN (AC-COUPLED) 10mA/DIV
3
CIN = 1µF, COUT = 1µF, C1 = 1µF, C2 = 1µF
VIN = 2.5V
IOUT = 120mA
500ns/DIV
Figure 24. Typical Operating Waveforms, G = 2×
VIN = 3.7V
ADP8860www.DataSheet4U.com
VOUT (1V/DIV)
2
IIN (10mA/DIV)
4
IOUT (10mA/DIV)
100µs/DIV
Figure 25. Typical Start-Up Waveform
Rev. 0 | Page 11 of 52
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADP8860.PDF ] | |
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