Datasheet

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