Datasheet

CAT3649
http://onsemi.com
3
Figure 2. ADIM Dimming Timing Diagram (no C
PWM
, PWM high)
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(Notes 2 and 3)
Parameter Symbol Conditions Min Typ Max Unit
Quiescent Current (excluding load) I
Q
1x mode
1.33 x mode, V
IN
= 3 V
1.5x mode, V
IN
= 2.8 V
2x mode, V
IN
= 2.6 V
1.4
2.2
2.7
2.8
2
4
4
4
mA
Shutdown Current I
QSHDN
V
ADIM
= 0 V 1
mA
LED Current Setting I
LED−SET
After ADIM is first enabled
(full scale LED current)
25 mA
LED Current Accuracy I
LED−ACC
(I
LEDx
– I
NOMINAL
) / I
NOMINAL
25 mA I
LED
setting
−10 ±2 +10 %
LED Channel Matching I
LED−DEV
(I
LED
− I
LEDAVG
) / I
LEDAVG
25 mA I
LED
setting
−5 ±1.5 +5 %
CPWM Pin Regulated Voltage V
CPWM
V
PWM
= V
IN
0.6 V
Output Resistance (open loop) R
OUT
1x mode
1.33x mode, V
IN
= 3 V
1.5x mode, V
IN
= 2.7 V
2x mode, V
IN
= 2.4 V
0.8
5
5
10
W
Charge Pump Frequency F
OSC
1.33x and 2x mode
1.5x mode
0.8
1
1
1.3
1.3
1.6
MHz
Output short circuit Current Limit I
SC_MAX
V
OUT
< 0.5 V 50 mA
Input Current Limit I
IN_MAX
V
OUT
> 1 V, 1x mode 250 mA
1x to 1.33x Transition Thresholds at any LED pin V
LEDTH
25 mA LED current per channel 100 mV
ADIM and PWM Pins
− Pull−down resistance
− Logic High Level
− Logic Low Level
R
PD
V
HI
V
LO
1.3
20
0.4
MW
V
V
Thermal Shutdown T
SD
150
_C
Thermal Hysteresis T
HYS
20
_C
Undervoltage lockout (UVLO) threshold V
UVLO
2.0 V
2. Typical values are at V
IN
= 3.6 V, PWM = ADIM = High, T
AMB
= 25°C.
3. Min and Max values are over recommended operating conditions unless specified otherwise.