Datasheet

LTC3803
3
3803fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 8V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CLAMP1mA
V
CC
Shunt Regulator Voltage at 1mA I
CC
= 1mA, V
ITH/RUN
= 0V
LTC3803E
LTC3803H, LTC3803I
LTC3803MP
l
l
l
8.3
8.3
8
9.4
9.4
9.4
10.3
10.5
10.5
V
V
V
V
CLAMP25mA
V
CC
Shunt Regulator Voltage at 25mA I
CC
= 25mA, V
ITH/RUN
= 0V
LTC3803E
LTC3803H, LTC3803I
LTC3803MP
l
l
l
8.4
8.4
8.1
9.5
9.5
9.5
10.5
10.7
10.7
V
V
V
V
MARGIN
V
CLAMP1mA
– V
TURNON
Margin LTC3803E
LTC3803H, LTC3803I, LTC3803MP
l
l
0.05
0.03
0.6
0.6
V
V
I
CC
Input DC Supply Current in Normal
Operation
(Note 4)
V
ITH/RUN
= 1.3V 240 350 µA
I
CC(UV)
Input DC Supply Current in Undervoltage V
CC
= V
TURNON
– 100mV
LTC3803E
LTC3803H, LTC3803I, LTC3803MP
l
l
40
40
90
110
µA
µA
V
ITHSHDN
Shutdown Threshold (at I
TH
/RUN) V
CC
> V
TURNON
, V
ITH/RUN
Falling
LTC3803E
LTC3803H, LTC3803I, LTC3803MP
l
l
0.15
0.09
0.28
0.28
0.45
0.46
V
V
I
ITHSTART
Start-Up Current Source V
ITH/RUN
= 0V 0.2 0.3 0.4 µA
V
FB
Regulated Feedback Voltage (Note 5)
LTC3803E:
0°C ≤ T
J
≤ 85°C
–40°C ≤ T
J
≤ 85°C
LTC3803I:
0°C ≤ T
J
≤ 85°C
–40°C ≤ T
J
≤ 125°C
LTC3803H:
0°C ≤ T
J
≤ 85°C
–40°C ≤ T
J
≤ 150°C
LTC3803MP:
0°C ≤ T
J
≤ 85°C
–55°C ≤ T
J
≤ 150°C
l
l
l
l
0.788
0.780
0.788
0.780
0.788
0.780
0.788
0.780
0.800
0.800
0.800
0.800
0.800
0.800
0.800
0.800
0.812
0.816
0.812
0.820
0.812
0.820
0.812
0.820
V
V
V
V
V
V
V
V
g
m
Error Amplifi er Transconductance I
TH/RUN
Pin Load = ±5µA (Note 5) 200 333 500 µA/V
ΔV
O(LINE)
Output Voltage Line Regulation (Note 5) 0.05 mV/V
ΔV
O(LOAD)
Output Voltage Load Regulation I
TH
/RUN Sinking 5µA (Note 5)
I
TH
/RUN Sourcing 5µA (Note 5)
3
3
mV/µA
mV/µA
I
FB
V
FB
Input Current (Note 5) 10 50 nA
f
OSC
Oscillator Frequency V
ITH/RUN
= 1.3V 180 200 240 kHz
DC
ON(MIN)
Minimum Switch On Duty Cycle V
ITH/RUN
= 1.3V, V
FB
= 0.8V 6 8 %
DC
ON(MAX)
Maximum Switch On Duty Cycle V
ITH/RUN
= 1.3V, V
FB
= 0.8V 70 80 90 %
t
RISE
Gate Drive Rise Time C
LOAD
= 3000pF 40 ns
t
FALL
Gate Drive Fall Time C
LOAD
= 3000pF (Note 7) 40 ns
V
IMAX
Peak Current Sense Voltage R
SL
= 0 (Note 6)
LTC3803E
LTC3803H, LTC3803I
LTC3803MP
l
l
l
90
90
85
100
100
100
115
120
120
mV
mV
mV
I
SLMAX
Peak Slope Compensation Output Current (Note 7) 5 µA
t
SFST
Soft-Start Time 1.4 ms