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NCP1840
OPERATING RANGES
Battery Supply Voltage
Digital Supply Voltage
Ground
LED Forward Voltage (Note 4)
R BIAS External Resistor
Ambient Temperature
Junction Temperature
Rating
Symbol
V BAT
DV CC
GND
V f
R BIAS
T A
T J
Min
3
3
10.25
? 40
? 40
Max
5.5
5.5
0
4.1
20.5
85
125
Unit
V
V
V
V
k W
° C
° C
4. At full PWM, max current level.
ELECTRICAL CHARACTERISTICS (T J = 25 ° C unless otherwise specified)
Parameter
Digital Supply Current (Note 5)
Digital Supply Current ? Low Power Mode (Note 6)
Battery Supply Current (Note 5)
Battery Supply Current ? Low Power Mode (Note 6)
LED Output Current ? Full ? Scale (Note 7)
LED Output Current ? Zero ? Scale (Note 7)
LED ? to ? LED Matching (Note 8)
Symbol
I DVCC
I DVCC ? LOQ
I VBATT
I VBATT ? LOQ
I LED(31)
I LED(0)
M LED
Min
28
0.81
Typ
2.3
0.6
520
120
30
0.85
4
Max
3.1
2
750
500
34.5
0.95
6.9
Unit
mA
m A
m A
nA
mA
mA
%
High Level Input Voltage ? SDA & SCL Pins
Low Level Input Voltage ? SDA & SCL Pins
V IH
V IL
0.8 *
DV CC
0.2 *
DV CC
V
V
Low Level Input Current ? SDA & SCL Pins
High Level Input Current ? SDA & SCL Pins
I IL
I IH
? 1.0
? 1.0
1.0
1.0
m A
m A
High Level Output Voltage ? SDA Pin
Low Level Output Voltage ? SDA Pin
Low Level Output Current ? SDA Pin
High Level Output Current ? SDA Pin
V OH
V OL
I OL
I OH
2.4
4.0
0.4
? 4.0
V
V
mA
mA
5. All LED outputs off, Charge Pump in 1X Mode, no I 2 C Communication.
6. Part enters Low Power Mode around 5 ms after all LED outputs are OFF and there is no I 2 C communication. Communication to the part
resumes normal operation in less than 1 ms.
7. With external R BIAS = 10.25 k W on R BIAS pin.
8. For T = ? 40 ° C, maximum LED ? to ? LED matching 7.5%. LED ? to ? LED Matching is calculated by comparing the output with highest current
against the output with lowest current, divided by the output with lowest current, all at the same programmed value. (I max ? I min ) / I min .
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