Datasheet

LTC3803-5
3
38035fd
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
= 5V, unless otherwise noted. (Notes 2, 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CLAMP25mA
V
CC
Shunt Regulator Voltage at 25mA I
CC
= 25mA, V
ITH/RUN
= 0V
LTC3803E-5
LTC3803I-5, LTC3803H-5
LTC3803MP-5
l
l
l
6.3
6.3
6
8.1
8.1
8.1
10.3
10.7
10.7
V
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-5
LTC3803I-5, LTC3803H-5, LTC3803MP-5
l
l
40
40
90
100
μA
μA
V
ITHSHDN
Shutdown Threshold (at I
TH
/RUN) V
CC
> V
TURNON
, V
ITH/RUN
Falling
LTC3803E-5
LTC3803I-5, LTC3803H-5
LTC3803MP-5
l
l
l
0.12
0.08
0.08
0.28
0.28
0.28
0.45
0.45
0.47
V
V
V
I
ITHSTART
Start-Up Current Source V
ITH/RUN
= 0V
LTC3803E-5
LTC3803I-5, LTC3803H-5, LTC3803MP-5
l
l
0.07
0.07
0.34
0.34
0.8
1
μA
μA
V
FB
Regulated Feedback Voltage (Note 5)
LTC3803E-5:
0°C ≤ T
J
≤ 85°C
–40°C ≤ T
J
≤ 85°C
LTC3803I-5:
0°C ≤ T
J
≤ 85°C
–40°C ≤ T
J
≤ 125°C
LTC3803H-5:
0°C ≤ T
J
≤ 85°C
–40°C ≤ T
J
≤ 150°C
LTC3803MP-5:
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) 0.1 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 170 200 230 kHz
DC
ON(MIN)
Minimum Switch On Duty Cycle V
ITH/RUN
= 1.3V, V
FB
= 0.8V 6.5 8.5 %
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-5
LTC3803I-5, LTC3803H-5
LTC3803MP-5
l
l
l
90
85
85
100
100
100
115
115
120
mV
mV
mV
I
SLMAX
Peak Slope Compensation Output
Current
(Note 7) 5 μA
t
SFST
Soft-Start Time 0.7 ms