SC644 SEMTECH [Semtech Corporation], SC644 Datasheet - Page 3

• Manufacturer Part Number: SC644
• Manufacturer: SEMTECH [Semtech Corporation]

Absolute Maximum Ratings
IN, OUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
C+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V
Pin Voltage — All Other Pins (V) . . . . . . . . . -0.3 to (V
OUT , LDOn
ESD Protection Level
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:
() subscript n = , 2, 3, and 4.
(2) Tested according to JEDEC standard JESD22-A4-B.
(3) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD5 standards.
Electrical Characteristics
Unless otherwise noted, T
(ESR = 0.03Ω)
Parameter
Supply Specifications
Input Supply Voltage
Shutdown Current
Total Quiescent Current
Charge Pump Electrical Specifications
Maximum Total Output Current
Backlight Current Setting Range
Backlight Current Accuracy
Backlight Current Matching
x Mode to .5x Mode
Falling Transition Voltage
.5x Mode to x Mode Hysteresis
()
()
Short Circuit Duration . . . . . . . . . .Continuous
(2)
A
(kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
= +25°C for Typ, -40ºC to +85°C for Min and Max, T
(4)
Symbol
I
V
OUT(MAX)
V
I
I
BL_ACC
I
TRANSx
Q(OFF)
HYSTx
V
BL-BL
I
I
BL
Q
IN
.5x or 2x mode, I
x mode, I
x mode, I
OUT
IN
+ 0.3)
I
I
OUT
OUT
+ 0.3)
Sleep (all LDOs off ), SPIF = V
Sleep (all LDOs on), SPIF = V
Sum of all active LED currents,
Nominal setting for BL – BL6
= 50mA, I
= 50mA, I
OUT
OUT
Shutdown, V
= 3.0 mA, I
= 50mA, I
OUT
Conditions
= 50mA, I
I
I
V
Recommended Operating Conditions
Ambient Temperature Range (°C) . . . . . . . . -40
Input Voltage (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9
Output Voltage (V). . . . . . . . . . . . . . . . . . . . . . 2.5
Voltage difference between any two LEDs (V) . . . ∆V
Thermal Information
Thermal Resistance, Junction to Ambient
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +50
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +50
Peak IR Reflow Temperature (0s to 30s) (°C) . . . . . . +260
BLn
BLn
BLn
BLn
OUT
= 2mA
= 2mA
= 0mA, V
= 0mA, V
≤ 4.2V
BLn
BLn
IN
(3)
J(MAX)
= 4.2V
= 25mA, 6 LEDs on
= 0.5mA, 6 LEDs on
BLn
= 25ºC, V
= 25mA, 6 LEDs on
OUT
OUT
= 3.2V
= 3.2V
IN
IN
(2)
(2)
IN
= 3.7V, C
Min

50
-3.5
2.9
= C
-8
0
2
= 2.2µF, C
Typ
±.5
±0.5
3.22
300
250
0.
2.6
4.8
5.6
90
(3)
IN
(°C/W) . . . . 35
Max
+3.5
= C
35
450
5.5
2.0
25
≤
8
SC644
≤
V
OUT
≤
T
OUT
A
V
= 4.7µF,
IN
F
≤
Units
≤
≤ .0
mA
mA
mA
mV
≤
µA
µA
5.25
%
%
+85
V
V
5.5
3