Datasheet

Data Sheet ADP8866
Rev. A | Page 3 of 52
SPECIFICATIONS
VIN = 3.6 V, SCL = 2.7 V, SDA = 2.7 V, nINT = open, nRST = 2.7 V, V
D1:D9
= 0.4 V, C1 = 1 μF, C2 = 1 μF, C
OUT
= 1 μF, typical values are at
T
J
= 25°C and are not guaranteed. Minimum and maximum limits are guaranteed from T
J
= −40°C to +105°C, unless otherwise noted.
Table 1.
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
SUPPLY
Input Voltage
Operating Range V
IN
2.5 5.5 V
Startup Level V
IN(START )
V
IN
increasing 1.98 2.25 V
Low Level V
IN(STOP)
V
IN
decreasing 1.75 1.90 V
V
IN(START )
Hysteresis
V
IN(HYS)
After startup
80
mV
UVLO Noise Filter t
UVLO
10 μs
Quiescent Current I
Q
During Standby I
Q(STBY)
V
IN
= 3.6 V, Bit nSTBY = 0, SCL = SDA =
0 V
0.25 1.0 μA
Current Consumption
During Blinking Off Time
I
Q(OFF)
V
IN
= 3.6 V, Bit nSTBY = 1, I
OUT
= 0 mA
Measured during blinking off time
245 325 μA
Switching I
Q(ACTIVE)
V
IN
= 3.6 V, Bit nSTBY = 1, I
OUT
= 0 mA
Gain = 1.0× 1.2 2.0 mA
Gain = 1.5× 3.7 5.4 mA
Gain = 2.0× 4.3 6.2 mA
OSCILLATOR Charge pump gain = 2×
Switching Frequency f
SW
0.8 1 1.2 MHz
Duty Cycle D 50 %
OUPUT CURRENT CONTROL
Maximum Drive Current I
D1:D9(MAX)
V
D1:D9
= 0.4 V
T
J
= 25°C
23.0
25.0
27.0
mA
T
J
= −40°C to +85°C 22.5 27.5 mA
LED Current Source Matching I
MATCH
All Current Sinks I
MATCH9
V
D1:D9
= 0.4 V 1.4 %
D1 to D5 Current Sinks I
MATCH5
V
D1:D5
= 0.4 V 1.1 %
Leakage Current on LED Pins I
D1:D9(LKG)
V
IN
= 5.5 V, V
D1:D9
= 2.5 V, Bit nSTBY = 1 0.5 μA
Equivalent Output Resistance R
OUT
Gain = 1× V
IN
= 3.6 V, I
OUT
= 100 mA 0.5 Ω
Gain = 1.5× V
IN
= 3.1 V, I
OUT
= 100 mA 3.0 Ω
Gain = 2× V
IN
= 2.5 V, I
OUT
= 100 mA 3.8 Ω
Regulated Output Voltage V
OUT(REG)
V
IN
= 3 V, gain = 2×, I
OUT
= 10 mA 4.4 4.9 5.2 V
AUTOMATIC GAIN SELECTION
Minimum Voltage
Gain Increases V
HR(UP)
Decrease V
DX
until the gain switches up 145 200 240 mV
Minimum Current Sink
Headroom Voltage
V
HR(MIN)
I
DX
= I
DX(MAX)
× 95% 210 mV
Gain Delay t
GAIN
The delay after gain has changed and
before gain is allowed to change again
100 μs
FAULT PROTECTION
Startup Charging Current
Source
I
SS
V
IN
= 3.6 V, V
OUT
= 0.8 × V
IN
3.5 7 11 mA
Output Voltage Threshold V
OUT
Exit Soft Start V
OUT(START)
V
OUT
rising 0.92 × V
IN
V
Short-Circuit Protection V
OUT(SC)
V
OUT
falling 0.55 × V
IN
V
Output Overvoltage Protection V
OVP
Activation Level 5.7 6.0 V
OVP Recovery Hysteresis 500 mV