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SC624AULTRT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
SC624A
4
Parameter Symbol Conditions Min Typ Max Units
Fault Protection (continued)
Charge Pump
Over-Voltage Protection
V
OVP
VOUT pin open circuit, V
OUT
= V
OVP
rising threshold
5.3 5.7 6.0 V
Undervoltage Lockout
V
UVLO
Decreasing V
IN
2.4 V
V
UVLO-HYS
300 mV
Charge Pump Electrical Speci cations
Maximum Total Output
Current
I
OUT(MAX)
V
IN
> 3.4V, sum of all active LED currents,
V
OUT(MAX)
= 4.2V
100 mA
Backlight Current Setting I
BL
Nominal setting for BL1 thru BL4 0.5 25 mA
Backlight Current Accuracy I
BL_ACC
V
IN
= 3.7V, I
BL
= 12mA, T
A
= 25°C -8 ±1.5 +8 %
Backlight Current Matching I
BL-BL
V
IN
= 3.7V, I
BL
= 12mA
(2)
-3.5 ±0.5 +3.5 %
1x Mode to 1.5x Mode
Falling Transition Voltage
V
TRANS1x
I
OUT
= 40mA, I
BLn
= 10mA, V
OUT
= 3.2V 3.27 V
1.5x Mode to 1x Mode
Hysteresis
V
HYST1x
I
OUT
= 40mA, I
BLn
= 10mA, V
OUT
= 3.2V 250 mV
1.5x Mode to 2x Mode
Falling Transition Voltage
V
TRANS1.5x
I
OUT
= 40mA, I
BLn
= 10mA, V
OUT
= 4.0V
(3)
2.92 V
2x Mode to 1.5x Mode
Hysteresis
V
HYST1.5x
I
OUT
= 40mA, I
BLn
= 10mA, V
OUT
= 4.0V
(3)
300 mV
Current Sink O -State
Leakage Current
I
BLn
V
IN
= V
BLn
= 4.2V 0.1 1 μA
Pump Frequency f
PUMP
V
IN
= 3.2V 250 kHz
LDO Electrical Speci cations
LDO1 Voltage Setting V
LDO1
Range of nominal settings
in 100mV increments
2.5 3.3 V
LDO2 Voltage Setting V
LDO2
Range of nominal settings
in 100mV increments
1.5 1.8 V
LDO1, LDO2 Output
Voltage Accuracy
V
LDO1,
V
LDO2
V
IN
= 3.7V, I
LDO
= 1mA -3.5 ±3 +3.5 %
Line Regulation ΔV
LINE
LDO1, I
LDO1
= 1mA, V
OUT
= 2.8V 2.1 7.2
mV
LDO2, I
LDO2
= 1mA, V
OUT
= 1.8V 1.3 4.8
Electrical Characteristics (continued)
SC624A
5
Electrical Characteristics (continued)
Parameter Symbol Conditions Min Typ Max Units
LDO Electrical Speci cations (continued)
Load Regulation ΔV
LOAD
V
LDO1
= 3.3V, V
IN
= 3.7V,
I
LDO1
= 1mA to 100 mA
25
mV
V
LDO2
= 1.8V, V
IN
= 3.7V,
I
LDO2
= 1mA to 100 mA
20
Dropout Voltage
(4)
V
D
I
LDO1
= 100mA 100 150 mV
Current Limit I
LIM
200 mA
Power Supply
Rejection Ratio
PSRR
LDO1
2.5V < V
LDO1
< 3V, f < 1kHz, C
BYP
= 22nF, I
LDO1
= 50mA,
V
IN
= 3.7V with 0.5V
P-P
ripple
50
dB
PSRR
LDO2
f < 1kHz, C
BYP
= 22nF, I
LDO2
= 50mA,
V
IN
= 3.7V with 0.5V
P-P
ripple
60
Output Voltage Noise
e
n-LDO1
LDO1, 10Hz < f < 100kHz, C
BYP
= 22nF, C
LDO
= 1μF,
I
LDO1
= 50 mA, V
IN
= 3.7V, 2.5V < V
LDO1
< 3V
100
μV
RMS
e
n-LDO2
LDO2, 10Hz < f < 100kHz, C
BYP
= 22nF,
C
LDO
= 1μF, I
LDO2
= 50 mA, V
IN
= 3.7V
50
Minimum Output Capacitor C
LDO(MIN)
1μF
Digital I/O Electrical Speci cations (EN)
Input High Threshold V
IH
V
IN
= 5.5V 1.6 V
Input Low Threshold V
IL
V
IN
= 3.0V 0.4 V
Input High Current I
IH
V
IN
= 5.5V -1 +1 μA
Input Low Current I
IL
V
IN
= 5.5V -1 +1 μA
I
2
C Interface
Interface complies with slave mode I
2
C interface as described by Philips I
2
C speci cation version 2.1 dated January, 2000.
Digital Input Voltage
V
B-IL
0.4 V
V
B-IH
1.6 V
SDA Output Low Level I
DIN
(SDA) ≤ 3mA 0.4 V
Digital Input Current I
B-IN
-0.2 0.2 μA
Hysteresis of
Schmitt Trigger Inputs
V
HYS
0.1 V
Maximum Glitch Pulse
Rejection
t
SP
50 ns
SC624A
6
Notes:
(1) ΔV
F
is the voltage difference between any two LEDs.
(2) Current matching equals ± [I
BL(MAX)
- I
BL(MIN
] / [I
BL(MAX)
+ I
BL(MIN)
].
(3) Test voltage is V
OUT
= 4.0V — a relatively extreme LED voltage — to force a transition during test. Typically V
OUT
= 3.2V for white LEDs.
(4) Dropout is de ned as (V
IN
- V
LDO1
) when V
LDO1
drops 100mV from nominal. Dropout does not apply to LDO2 since it has a maximum output voltage
of 1.8V.
(5) Guaranteed by design
Parameter Symbol Conditions Min Typ Max Units
I
2
C Interface (Continued)
I/O Pin Capacitance C
IN
10 pF
I
2
C Timing
Clock Frequency f
SCL
400 440 kHz
SCL Low Period
(5)
t
LOW
1.3 μs
SCL High Period
(5)
t
HIGH
0.6 μs
Data Hold Time
(5)
t
HD_DAT
0μs
Data Setup Time
(5)
t
SU_DAT
100 μs
Setup Time for Repeated
START Condition
(5)
t
SU_STA
0.6 μs
Hold Time for Repeated
START Condition
(5)
t
HD_STA
0.6 μs
Setup Time for STOP
Condition
(5)
t
SU_STO
0.6 μs
Bus-Free Time Between
STOP and START
(5)
t
BUF
1.3 μs
Interface Start-up Time
(5)
t
EN
Bus Start-up Time After EN Pin is Pulled High 1 ms
Electrical Characteristics (continued)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

SC624AULTRT

Mfr. #:
Buy SC624AULTRT
Manufacturer:
Semtech
Description:
LED Lighting Drivers CONSULT FCTRY FOR AVAILABILITY
Lifecycle:
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