sc643 Semtech Corporation, sc643 Datasheet - Page 5

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

Electrical Characteristics (continued)
Notes:
(1) Capacitors are MLCC of X5R type. Production tested with higher value capacitors than the application requires.
(2) SPIF is high for more than 10ms
(3) Subscript for all backlights (BLn), n = 1, 2, 3, 4 and 5. Subscripting for all LDOs (LDOn), n = 1, 2, 3, 4.
(4) Current matching is defined as ± [I
(5) Test voltage is V
(6) Subscript m = 1, 3, and 4 and applies only to LDO1, LDO3, and LDO4.
(7) X5R or better “temperature stable” MLCC capacitor.
(8) The source driver used to provide the SemPulse output must meet these limits.
(9) The SemPulse start-up time is the minimum time that the SPIF pin must be held high to enable the part before commencing
(10) The SemPulse shutdown time is the minimum time that the SPIF pin must be pulled low to shut the part down.
Parameter
Digital I/O Electrical Specifi cations (SPIF, ENL4)
Input High Threshold
Input Low Threshold
Input High Current
Input Low Current
SemPulse Electrical Specifi cations (SPIF)
SemPulse Start-up Time
Bit Pulse Duration
Duration Between Bits
Hold Time - Address
Hold Time - Data
Bus Reset Time
Shutdown Time
Fault Protection
Output Short Circuit Current Limit
Over-Temperature
Charge Pump
Over-Voltage Protection
Under Voltage Lockout
communication.
(8)
(10)
(8)
(8)
OUT
(8)
(8)
(8)
=4.2V — a relatively extreme LED voltage — to force a transition during test. Typically V
(8)
(9)
BL(MAX)
Symbol
V
t
I
t
V
UVLO-HYS
OUT(SC)
- I
HOLDD
V
HOLDA
T
T
V
V
t
t
t
t
t
UVLO
I
I
OTP
HYS
OVP
IH
SU
LO
BR
SD
IL
HI
BL(MIN)
IH
IL
] / [I
BL(MAX)
+ I
BL(MIN)
OUT pin open circuit, V
].
OUT pin shorted to GND
SPIF is pulled low
SPIF is held high
SPIF is held high
SPIF is held high
Rising threshold
Decreasing V
Conditions
Hysteresis
V
V
V
V
IN
IN
IN
IN
= 5.5V
= 2.9V
= 5.5V
= 5.5V
IN
OUT
= V
OVP
Min
0.75
0.75
OUT
500
500
1.6
10
10
-1
-1
1
=3.2V for white LEDs.
Typ
300
165
300
5.7
2.4
30
Max
5000
250
250
0.4
6.0
+1
+1
SC643
Units
mA
mV
μA
μA
ms
ms
ms
μs
μs
μs
μs
°C
°C
V
V
V
V
5
5