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PDF ADP8866 Data sheet ( Hoja de datos )
| Número de pieza | ADP8866 | |
| Descripción | Charge Pump Driven 9-Channel LED Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
Charge Pump Driven 9-Channel LED Driver with
Automated LED Lighting Effects
ADP8866
FEATURES
Charge pump with automatic gain selection of 1×, 1.5×, and
2× for maximum efficiency
92% peak efficiency
9 independent and programmable LED drivers
Each driver is capable of 25 mA (full scale)
Each driver has 7 bits (128 levels) of nonlinear current
settings
Standby mode for <1 µA current consumption
16 programmable fade-in and fade-out times (0.0 sec to
1.75 sec) with choice of square or cubic rates
Automated and customizable LED blinking
Unique heartbeat mode for programmable double pulse
lighting effects on 4 channels (D6 to D9)
PWM input for implementing content adjustable brightness
control (cABC)
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 1.9 V
Small lead frame chip scale package (LFCSP)
GENERAL DESCRIPTION
The ADP8866 combines a programmable backlight LED charge
pump driver with automatic blinking functions. Nine LED drivers
can be independently programmed at currents up to 25 mA.
The current level, fade time, and blinking rate can be programmed
once and executed autonomously on a loop. Separate fade-in
and fade-out times can be set for the backlight LEDs.
APPLICATIONS
Mobile display backlighting
Mobile phone keypad backlighting
LED indication and status lights
Automated LED blinking
TYPICAL OPERATING CIRCUIT
VIN
1µF
nRST
SDA
SCL
nINT
GND
D1 D2 D3 D4 D5 D6 D7 D8 D9
ADP8866
Figure 1.
VOUT
1µF
C1+
C1
C1– 1µF
C2+
C2
C2– 1µF
Driving all of this 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 over-
temperature 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.
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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 ©2011–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADP8866
Parameter
Thermal Shutdown
Threshold
Hysteresis
Isolation from Input to
Output During Fault
Time to Validate a Fault
I2C INTERFACE
VDDIO Voltage Operating Range
Logic Low Input
Logic High Input
I2C TIMING SPECIFICATIONS
Delay from Reset Deassertion
to I2C Access
SCL Clock Frequency
SCL High Time
SCL Low Time
Setup Time
Data
Repeated Start
Stop Condition
Hold Time
Data
Start/Repeated Start
Bus Free Time (Stop and Start
Conditions)
Rise Time (SCL and SDA)
Fall Time (SCL and SDA)
Pulse Width of Suppressed
Spike
Capacitive Load Per Bus Line
Symbol
TSD
TSD(HYS)
IOUTLKG
tFAULT
VDDIO
VIL
VIH
tRESET
fSCL
tHIGH
tLOW
tSU, DAT
tSU, STA
tSU, STO
tHD, DAT
tHD, STA
tBUF
tR
tF
tSP
CB
Test Conditions/Comments
Increasing temperature
VIN = 5.5 V, VOUT = 0 V, Bit nSTBY = 0
VIN = 2.5 V
VIN = 5.5 V
Guaranteed by design
Timing Diagram
Min Typ
150
20
2
1.55
0.6
1.3
100
0.6
0.6
0
0.6
1.3
20 + 0.1 × CB
20 + 0.1 × CB
0
Data Sheet
Max Unit
°C
°C
1 μA
μs
5.5 V
0.5 V
V
20 μs
400 kHz
μs
μs
ns
μs
μs
0.9 μs
μs
μs
300 ns
300 ns
50 ns
400 pF
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
tSP tR
tBUF
tSU, STO
P
S
Rev. A | Page 4 of 52
5 Page 
ADP8866
100
90
80
70
60
50
40
30
VF = 3.4V
VF = 4.0V
20
10
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
Figure 22. Typical Efficiency (Each LED Set to 25 mA)
T
CIN = 1µF, COUT = 1µF, C1 = 1µF, C2 = 1µF
VIN = 3.6V
IOUT = 120mA
VIN (AC-COUPLED) 50mV/DIV
1
VOUT (AC-COUPLED) 50mV/DIV
2
IIN (AC-COUPLED) 10mA/DIV
3
1µs/DIV
Figure 23. Typical Operating Waveforms, G = 1×
T
CIN = 1µF, COUT = 1µF, C1 = 1µF, C2 = 1µF
VIN = 3.0V
IOUT = 120mA
1
VIN (AC-COUPLED) 50mV/DIV
VOUT (AC-COUPLED) 50mV/DIV
2
IIN (AC-COUPLED) 10mA/DIV
3
1µs/DIV
Figure 24. Typical Operating Waveforms, G = 1.5×
Data Sheet
T
CIN = 1µF, COUT = 1µF, C1 = 1µF, C2 = 1µF
VIN = 2.5V
IOUT = 120mA
1
VIN (AC-COUPLED) 50mV/DIV
VOUT (AC-COUPLED) 50mV/DIV
2
IIN (AC-COUPLED) 10mA/DIV
3
1µs/DIV
Figure 25. Typical Operating Waveforms, G = 2×
T
CIN = 10µF, COUT = 1µF, C1 = 1µF, C2 = 1µF
VIN = 3.6V
VOUT (1V/DIV)
2
IIN (10mA/DIV)
IOUT (10mA/DIV)
3
4
100µs/DIV
Figure 26. Typical Startup Waveforms
Rev. A | Page 10 of 52
11 Page | ||
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| PDF Descargar | [ Datasheet ADP8866.PDF ] | |
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