SC621A
Absolute Maximum Ratings
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
VOUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
C1+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V
OUT
+ 0.3)
Pin Voltage - All Other Pins (V) . . . . . . . . . . . -0.3 to (V
IN
+ 0.3)
VOUT Short Circuit Duration . . . . . . . . . . . . . . . . Continuous
VLDO1, VLDO2 Short Circuit Duration. . . . . . . Continuous
ESD Protection Level
(1)
(kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Recommended Operating Conditions
Ambient Temperature Range (°C) . . . . . . . . -40 < T
A
< +85
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 < V
IN
< 5.5
VOUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 < V
OUT
< 5.25
Voltage Difference between any two LEDs (V) . . . . . . < 1.2
Thermal Information
Thermal Resistance, Junction to Ambient
(2)
(°C/W) . . . . 35
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +150
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) Tested according to JEDEC standard JESD22-A114-B.
(2) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless otherwise noted, T
A
= +25°C for Typ, -40ºC to +85°C for Min and Max, T
J(MAX)
= 125ºC, V
IN
= 3.0V to 4.2V, C
IN
= C
1
= C
2
= 2.2μF,
C
OUT
= 4.7μF (ESR = 0.03Ω), ΔV
F
≤ 1.2V
(1)
Parameter
Supply Specifications
Shutdown Current
Symbol
Conditions
Min
Typ
Max
Units
I
Q(OFF)
Shutdown, V
IN
= 4.2V
Sleep (LDOs off ), EN = V
IN
Sleep (LDOs on), EN = V
IN
,
V
IN
> (V
LDO
+ 300mV), I
LDO
< 200mA
0.1
100
220
3.8
4.6
4.6
2
160
μA
μA
340
4.65
5.85
5.85
mA
Total Quiescent Current
I
Q
Charge pump in 1x mode, 4 backlights on
Charge pump in 1.5x mode, 4 backlights on
Charge pump in 2x mode, 4 backlights on
Fault Protection
Output Short Circuit
Current Limit
Over-Temperature
Flash Mode Safety Timer
(2)
I
OUT(SC)
T
OTP
t
FL(MAX)
Flash sink active
0.75
VOUT pin shorted to GND
300
160
1.00
1.25
mA
°C
s
3
SEMTECH [ SEMTECH CORPORATION ]
