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SC654ULTRT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
7
Typical Characteristics (continued)
SC654
1ms/div
Output Short Circuit Current Limit
V
OUT
(1V/div)
I
OUT
(50mA/div)
Backlight Accuracy (6 LEDs) — 12mA Each
-8
-6
-4
-2
0
2
4
6
8
2.7
33.3
3.63.9
4.2
A
CC
Max %
A
CC
Min %
V
IN
(V)
Accuracy (%)
Ripple — 2x Mode
20μs/div
V
IN
(100mV/div)
V
OUT
(100mV/div)
I
BL
(10mA/div)
C
IN
= C
OUT
= 4.7µF, V
IN
= 2.9V, 6 LEDs — 15mA each
Ripple — 1x Mode
20μs/div
V
IN
(100mV/div)
V
OUT
(100mV/div)
I
BL
(10mA/div)
C
IN
= C
OUT
= 4.7µF, 6 LEDs, — 15mA each
Ripple — 1.5x Mode
20μs/div
V
IN
(100mV/div)
V
OUT
(100mV/div)
I
BL
(10mA/div)
Output Open Circuit Protection
20μs/div
V
BL
(500mV/div)
V
OUT
(1V/div)
I
BL
(10mA/div)
0
0
C
IN
= C
OUT
= 4.7µF, V
IN
= 2.9V, 6 LEDs, — 15mA each
0
8
Pin Descriptions
SC654
Pin # Pin Name Pin Function
1 BL3
Current sink output for main backlight LED 3
— leave this pin open if unused
2 BL4
Current sink output for main backlight LED 4
— leave this pin open if unused
3 BL5
Current sink output for main backlight LED 5 — leave this pin open if unused
4 BL6
Current sink output for main backlight LED 6
— leave this pin open if unused
5 SPIF
SemPulse single wire interface pin — used to enable/disable the device and to con gure all regis-
ters (refer to Register Map and SemPulse Interface sections)
6 GND Ground pin
7 C2- Negative connection to bucket capacitor 2
8 C1- Negative connection to bucket capacitor 1
9 C1+ Positive connection to bucket capacitor 1
10 C2+ Positive connection to bucket capacitor 2
11 OUT Charge pump output — all LED anode pins should be connected to this pin
12 IN Battery voltage input
13 BL1
Current sink output for main backlight LED 1
— leave this pin open if unused
14 BL2
Current sink output for main backlight LED 2
— leave this pin open if unused
9
Block Diagram
SC654
Oscillator
Current
Setting
DAC
SemPulse
Digital
Interface
and Logic
Control
Fractional Charge Pump
(1x, 1.5x, 2x)
C1+
C1- C2+ C2-
OUT
BL1
BL2
BL3
BL4
IN
SPIF
GND
9 7108
12
5
6
11
13
14
1
2
BL5
BL6
3
4
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

SC654ULTRT

Mfr. #:
Buy SC654ULTRT
Manufacturer:
Semtech
Description:
IC LED DRIVER RGLTR 25MA 14MLPQ
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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