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ADM8843
SPECIFICATIONS
V CC = 2.6 V to 5.5 V; T A = ?40°C to +85°C, unless otherwise noted; C1, C2 = 1.0 μF; C3 = 2.2 μF; C4 = 4.7 μF.
Table 1.
Parameter
INPUT VOLTAGE, V CC
SUPPLY CURRENT, I CC
Min
2.6
Typ
2.6
Max
5.5
5
Unit
V
mA
Test Conditions
All four LEDs disabled, V CC = 3.3 V, R SET = 7.08 kΩ,
CTRL1 = 1, CRTL2 = 1
SHUTDOWN CURRENT
CHARGE PUMP FREQUENCY
CHARGE PUMP MODE THRESHOLDS
1.5× to 2×
2× to 1.5×
Hysteresis
1× to 1.5×
1.5× to 1×
Hysteresis
I SET PIN
1.5
3.33
3.36
40
4.77
4.81
40
5
μA
MHz
V
V
mV
V
V
mV
LED : LED Matching
I SET Pin Voltage
I LED -to-I SET Ratio
I LED -to-I SET Ratio Accuracy
MIN COMPLIANCE ON FBx PIN
CHARGE PUMP OUTPUT RESISTANCE
LED CURRENT
0.3
1.18
120
±5%
0.15
1.2
3.5
8.0
20
%
V
V
Ω
Ω
Ω
mA
I LED = 20 mA, V FB = 0.4 V
I SET = 15 mA
1× mode
1.5× mode
2× mode
PWM 1
0.1
200
kHz
DIGITAL INPUTS
Input High
0.7 V CC
V
Input Low
Input Leakage Current
0.3 V CC
1
V
μA
CHARGE PUMP POWER EFFICIENCY
V OUT RIPPLE
1
Guaranteed by design. Not 100% production tested.
88
30
%
mV
CTRL1 = 1, CRTL2 = 1, V CC = 3.4 V, V FB = 0.2 V, I FB = 20 mA
V CC = 3.6 V, I LED = 20 mA, all four LEDs enabled
Rev. C | Page 3 of 16
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