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PDF ADP8863 Data sheet ( Hoja de datos )
| Número de pieza | ADP8863 | |
| Descripción | 7-Channel Fun Lighting LED Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Automated blinking and funlight timing for each LED driver
16 programmable fade in and fade out times
0.1 sec to 5.5 sec
Selectable linear, square, or cubic fade rates
7 independent and programmable LED drivers
7 drivers capable of 30 mA (maximum)
1 driver also capable of 60 mA (maximum)
Programmable maximum current limit (128 levels)
Separate and independent controls for backlight LEDs
Backlight fade override
Up to two built-in comparator inputs with programmable
modes for ambient light sensing
Charge pump with automatic gain selection of 1×, 1.5×, and
2× for maximum efficiency
Standby mode for <1 μA current consumption
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 lead frame chip scale package (LFCSP)
APPLICATIONS
LED indication
Funlight indicator lighting
Keypad backlighting
RGB LED color generation and mixing
General backlighting of small format displays
GENERAL DESCRIPTION
The ADP8863 combines a powerful charge pump driver with
advanced autonomous LED lighting features. It allows as
many as seven LEDs to be independently driven up to 30 mA
(maximum). The seventh LED can also be driven to 60 mA
(maximum). All LEDs are programmable for maximum current
and fade in/fade out times via the I2C interface.
Additionally, automated blinking routines can be independently
programmed and enabled for all seven LED channels. These
LEDs can also be combined into groups to reduce the processor
instructions.
Charge Pump, 7-Channelwww.DataSheet4U.com
Fun Lighting LED Driver
ADP8863
TYPICAL OPERATING CIRCUIT
VIN
CIN
1µF
VALS
PHOTO
SENSOR
D1 D2 D3 D4 D5 D6 D7 CMP_IN
0.1µF
VOUT
VDDIO
COUT
1µF
nRST
nINT
SDA
SCL
ADP8863
C1+
C1
C1– 1µF
C2+
C2
C2– 1µF
GND1
GND2
Figure 1.
This entire configuration is driven by a two-capacitor charge pump
with gains of 1×, 1.5×, and 2×. The charge pump 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. Additionally, input inrush currents are limited via an
integrated soft start combined with controlled input-to-output
isolation.
The ADP8863 is available in a compact lead frame chip scale
package (LFCSP).
Rev. 0
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.
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.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
VIN, VOUT
D1, D2, D3, D4, D5, D6, and D7
CMP_IN
nINT, nRST, SCL, and SDA
Output Short-Circuit Duration
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Soldering Conditions
ESD (Electrostatic Discharge)
Human Body Model (HBM)
Charged Device Model (CDM)
Rating
−0.3 V to +6 V
−0.3 V to +6 V
−0.3 V to +6 V
−0.3 V to +6 V
Indefinite
–40°C to +85°C1
–40°C to +125°C
–65°C to +150°C
JEDEC J-STD-020
±3 kV
±1.5 kV
1 The maximum operating junction temperature (TJ(MAX)) takes precedence
over the maximum operating ambient temperature (TA(MAX)). See the
Maximum Temperature Ranges section for more information.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Absolute maximum ratings apply individually only, not in
combination. Unless otherwise specified, all voltages are
referenced to ground.
ADP8863www.DataSheet4U.com
MAXIMUM TEMPERATURE RANGES
The maximum operating junction temperature (TJ(MAX)) takes
precedence over the maximum operating ambient temperature
(TA(MAX)). Therefore, in situations where the ADP8863 is
exposed to poor thermal resistance and high power dissipation
(PD), the maximum ambient temperature may need to be
derated. In these cases, the maximum ambient temperature can
be calculated with the following equation:
TA(MAX) = TJ(MAX) − (θJA × PD(MAX))
THERMAL RESISTANCE
θJA (junction to air) is specified for the worst-case conditions,
that is, a device soldered in a circuit board for surface-mount
packages. The θJA, θJB (junction to board), and θJC (junction to
case) are determined according to JESD51-9 on a 4-layer
printed circuit board (PCB) with natural convection cooling.
For the LFCSP package, the exposed pad must be soldered to
the GND1 and/or GND2 terminal(s) on the board.
Table 3. Thermal Resistance
Package Type
20-Lead LFCSP_WQ
θJA
49.5
θJC Unit
5.3 °C/W
ESD CAUTION
Rev. 0 | Page 5 of 48
5 Page 
ADP8863www.DataSheet4U.com
THEORY OF OPERATION
The ADP8863 combines a powerful LED charge pump driver
with independent control of up to seven LEDs. These LED
drivers can sink up to 30 mA (typical) on six channels. The
seventh LED can also be driven to 60 mA (typical). All LEDs
can be individually programmed or combined into a group to
operate backlight LEDs. A full set of safety features, including
short-circuit, overvoltage, and overtemperature protection with
input-to-output isolation, allows for a robust and safe design.
The integrated soft start limits inrush currents at startup, restart
attempts, and gain transitions.
OPTIONAL
PHOTOSENSOR
VALS
D1 D2 D3 D4 D5 D6 D7
ID1 ID2 ID3 ID4 ID5 ID6 ID7
GAIN
SELECT
LOGIC
VIN
VBAT
CIN
VDDIO
nRST
SCL
SDA
nINT
VIN
UVLO
STNDBY
NOISE FILTER
50µs
RESET
STANDBY
VIN
EN
VREFS
IREFS
CLK
LIGHT
SENSOR
LOGIC
I2C
LOGIC
SWITCH CONTROL
CURRENT SINK CONTROL
CHARGE
PUMP
LOGIC
CMP_IN
PHOTOSENSOR
CONVERSION
VIN
ISS
SOFT START
VOUT
COUT
CHARGE
PUMP
(1×, 1.5×, 2×)
C1+
C1
1µF
C1–
C2+
C2
1µF
C2–
GND1 GND2
Figure 25. Detailed Block Diagram
Rev. 0 | Page 11 of 48
11 Page | ||
| Páginas | Total 48 Páginas | |
| PDF Descargar | [ Datasheet ADP8863.PDF ] | |
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