sc643 Semtech Corporation, sc643 Datasheet - Page 3

• Manufacturer Part Number: sc643
• Description: Light Management Unit With 4 Ldos And Sempulse Interface
• Manufacturer: Semtech Corporation

Absolute Maximum Ratings
IN, OUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
C1+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V
Pin Voltage — All Other Pins (V) . . . . . . . . . -0.3 to (V
OUT , LDOn
ESD Protection Level
Exceeding the above specifi cations may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specifi ed in the Electrical Characteristics section is not recommended.
NOTES:
(1) subscript n = 1, 2, 3, and 4.
(2) Tested according to JEDEC standard JESD22-A114-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 JESD51 standards.
Electrical Characteristics
Unless otherwise noted, T
(ESR = 0.03Ω)
Parameter
Supply Specifi cations
Input Supply Voltage
Shutdown Current
Total Quiescent Current
Charge Pump Electrical Specifi cations
Maximum Total Output Current
Backlight Current Setting Range
Backlight Current Accuracy
Backlight Current Matching
1x Mode to 1.5x Mode
Falling Transition Voltage
1.5x Mode to 1x Mode Hysteresis
(1)
(1)
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
TRANS1x
Q(OFF)
HYST1x
V
BL-BL
I
I
BL
Q
IN
1.5x or 2x mode, I
1x mode, I
1x 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 BL1 – BL5
= 50mA, I
= 50mA, I
OUT
OUT
Shutdown, V
= 2.5mA, I
= 125mA, I
OUT
Conditions
= 125mA, I
I
I
V
Recommended Operating Conditions
Ambient Temperature Range (°C) . . . . . . . . -40
Input Voltage (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9
Output Voltage (V). . . . . . . . . . . . . . . . . . . . . . 2.5
Voltage diff erence between any two LEDs (V) . . . ΔV
Thermal Information
Thermal Resistance, Junction to Ambient
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +150
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Refl ow Temperature (10s to 30s) (°C) . . . . . . +260
BLn
BLn
BLn
BLn
OUT
= 12mA
= 12mA
= 10mA, V
= 10mA, V
≤ 4.2V
BLn
BLn
(3)
IN
J(MAX)
= 4.2V
= 25mA, 5 LEDs on
= 0.5mA, 5 LEDs on
BLn
= 125ºC, V
= 25mA, 5 LEDs on
OUT
OUT
= 3.2V
= 3.2V
IN
IN
(2)
(2)
IN
= 3.7V, C
Min
1
125
-3.5
2.9
= C
-8
0
2
= 2.2μF, C
Typ
±1.5
±0.5
3.22
300
250
0.1
2.5
4.3
5.1
90
(3)
IN
(°C/W) . . . . 35
Max
+3.5
= C
135
450
5.5
2.0
25
≤
8
SC643
≤
V
OUT
≤
T
OUT
A
V
= 4.7μF,
IN
F
≤
Units
≤
≤ 1.0
mA
mA
mA
mV
≤
μA
μA
5.25
%
%
+85
V
V
5.5
3
3