Datasheet

ADD5205 Data Sheet
Rev. 0 | Page 4 of 16
SPECIFICATIONS
V
IN
= 3.7 V,
SHDN
= high, T
A
= −25°C to +85°C, unless otherwise noted. Typical values are at T
A
= 25°C.
Table 1.
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
SUPPLY
Input Voltage Range V
IN
2.8 18 V
Quiescent Current I
Q
V
IN
= 2.8 V to 18 V, not switching 3.4 mA
Shutdown Supply Current I
SD
V
IN
= 2.8 V to 18 V,
SHDN
= 0 V
1 μA
SWITCH
On Resistance R
DS(ON)
I
SW
= 100 mA 0.3 Ω
Switch Current Limit I
CL
1.9 A
Leakage Current I
LKG
1 μA
OSCILLATOR
Switching Frequency f
OSC
1 MHz
Maximum Duty Cycle D
MAX
90 %
SOFT START
Soft Start Time
1
1.5 ms
CURRENT SOURCE
ISET Pin Voltage V
SET
1.26 V
C_FILTER Pin Voltage V
C_FILTER
Duty = 100% 0.22 V
Adjustable LED Current
1
I
LED
25 mA
Constant Current Sink of 20 mA
2
I
LED20
R
SET
= 130 kΩ 19.6 20 20.6 mA
Headroom Voltage of 20 mA
2
V
HR20
R
SET
= 130 kΩ 0.66 V
Current Matching Between Strings
2
I
LED
= 20 mA −2 +2 %
LED Current Accuracy of 20 mA
2
I
LED
= 20 mA −3 +3 %
Current Source Leakage Current 1 μA
SHUTDOWN CONTROL
SHDN
Voltage High
V
SHDN
_HIGH
V
IN
= 2.8 V to 18 V 1.5 6 V
SHDN
Voltage Low
V
SHDN
_LOW
V
IN
= 2.8 V to 18 V 0.6 V
PWM Control
PWM Input Frequency Range
1
0.1 kHz
PWM Voltage High V
PWM_HIGH
V
IN
= 2.8 V to 18 V 1.5 V
PWM Voltage Low V
PWM_LOW
V
IN
= 2.8 V to 18 V 0.6 V
1
Guaranteed by design.
2
Tested at T
A
= 25°C.