Datasheet
LTC3824
3
3824fh
For more information www.linear.com/LTC3824
elecTrical characTerisTics
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
CC
= 12V, R
SET
= 392k, C
CAP
= 0.1µF. No load on any
outputs, unless otherwise specified.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage (V
CC
)
l
4 60 V
Supply Current (I
VCC
) V
C
≤ 0.4V (Switching Off), V
CC
≤ 60V
V
SYNC
= 0V (Burst Mode Operation Disable)
0.8 1.3 mA
Supply Current (I
VCC
) Burst Mode Operation V
CC
≤ 60V, SYNC/MODE Open, V
C
= 0.6V 40 65 µA
Supply Current in Shutdown V
C
≤ 25mV, V
CC
≤ 60V
l
9 20
30
µA
µA
V
C
≤ 25mV, V
CC
= 12V
l
5 10
15
µA
µA
Voltage Amplifier gm
Reference V
oltage (V
REF
)
LTC3824E/LTC3824I
LTC3824MP/LTC3824H
l
l
0.792
0.788
0.788
0.8 0.808
0.812
0.816
V
V
V
Transconductance V
C
= 0.8V, ∆I
VC
= ±2µA 220 260 370 µmho
FB Input Current V
FB
= V
REF
(Note 3): LTC3824E/LTC3824I
LTC3824MP/LTC3824H
l
l
10
10
30
60
nA
nA
V
C
High I
VC
= 0 1.6 V
V
C
Low I
VC
= 0 0.35 0.5 V
V
C
Source Current V
VC
= 0.5V to 1.3V, V
FB
= V
REF
–100mV (V
SYNC
= 0V) 15 µA
V
C
Sink Current V
VC
= 0.7V to 1.3V, V
FB
= V
REF
+100mV (V
SYNC
= 0V) 15 µA
V
C
Threshold for Switching Off V
SYNC/MODE
= 0V (Note 4)
l
0.4 V
Soft-Start Current I
SS
V
SS
= 0.1V to 1.5V
l
3
2.5
5 7.5
8
µA
µA
V
C
Burst Mode Threshold V
CC
≤ 60V, V
C
Rising, SYNC/MODE Open 0.84 V
V
C
Burst Mode Threshold Hysteresis V
CC
≤ 60V 0.04 V
SENSE Voltage at Burst Mode Operation (V
CC
–V
SENSE
) at 30% Duty Cycle
70% Duty Cycle
30
20
mV
mV
Current Limit Threshold (V
CC
–V
SENSE
) V
CC
≤ 60V: LTC3824E/LTC3824I
LTC3824MP/LTC3824H
l
l
80
75
100
100
120
120
mV
mV
FB Overvoltage Threshold V
C
= 1.6V 8 %
Sense Input Current V
SENSE
= V
CC
0.1 2 µA
Oscillator
Switching Frequency R
SET
= 392k: LTC3824E/LTC3824I
LTC3824MP/LTC3824H
l
l
170
170
200
200
230
240
kHz
kHz
R
SET
= 200k
l
320 400 460 kHz
Synchronization Pulse Threshold
on SYNC Pin
Rising Edge V
SYNC
1.3 V
Synchronization Frequency Range R
SET
= 392k
R
SET
= 200k
l
l
230
460
300
600
kHz
kHz
V
RSET
R
SET
= 392k 1.2 V
Minimum On-Time (Measured at GATE Pin) CCM Operation (Note 5) 350 ns
Switching Frequency Foldback V
FB
= 0.3V
l
35 50 75 kHz
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