sc656 Semtech Corporation, sc656 Datasheet - Page 4

• Manufacturer Part Number: sc656
• Description: Backlight Driver For 7 Leds With Charge Pump And Pwm Control
• Manufacturer: Semtech Corporation

Electrical Characteristics (continued)
Notes:
() Guaranteed by design
(2) Current matching equals ± [I
(3) Test voltage is V
(4) The settling time is affected by the magnitude of change in the PWM duty cycle.
Parameter
Current Transition Settling Time
ENM/ENS Low Time
x Mode to .5x Mode
Falling Transition Voltage
.5x Mode to 2x Mode
Falling Transition Voltage
Current Sink Off-State
Leakage Current
Charge Pump Frequency
Output Short Circuit Current Limit
Under Voltage Lockout Threshold
UVLO Hysteresis
Over-Voltage Protection
Over-Temperature
OT Hysteresis
Digital Logic Pins — ENM, ENS, BANK2, AND BANK1
Input High Threshold
Input Low Threshold
Input High Current
Input Low Current
OUT
= 4.0V — a relatively extreme LED voltage used to force a transition during test. Typically V
BL(MAX)
- I
Symbol
V
BL(MIN
V
V
I
T
I
TRANS.5x
UVLO-HYS
V
BLn(off )
f
OUT(SC)
TRANSx
V
OT-HYS
PUMP
T
V
V
t
UVLO
I
I
t
OVP
OT
IH
LT
IL
IH
s
IL
] / [I
BL(MAX)
Time that voltage on ENM or ENS can be low with-
OUT pin open circuit, V
+ I
BL(MIN)
Duty cycle change from 00% to 50%
I
OUT
I
].
OUT
Increasing V
= 70mA, I
= 70mA, I
OUT pin shorted to GND
out disabling the device
Rising Temperature
V
Conditions
IN
V
BLn
V
V
V
V
V
BLn
= V
IN
OUT
IN
IN
IN
IN
IN
— lockout released
= 0mA, V
OUT
= 0mA, V
= 3.2V
= 5.5V
= 2.9V
= 5.5V
= 5.5V
BLn
> 2.5V
= V
= 4.2V
OVP
, V
OUT
IN
OUT
rising threshold
= 4.0V
= 3.2V
(3)
()(4)
Min
.4
OUT
= 3.2V for white LEDs.
Typ
3.26
2.90
250
400
500
65
0.5
0.
2.4
5.7
50
25
Max
6.0
0.4
5



Units
kHz
mA
mV
ms
µA
µA
µA
°C
°C
V
V
V
V
V
V
s
4