(Note 2).................................................. –55°C to 150°C
Storage Temperature Range..................... –65° to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
MSE PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 43°C/W,
θ
JC
= 3°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3824EMSE#PBF
LTC3824EMSE#TRPBF
LTBRZ
10-Lead Plastic MSOP
–40°C to 125°C
LTC3824IMSE#PBF
LTC3824IMSE#TRPBF
LTCGZ
10-Lead Plastic MSOP
–40°C to 125°C
LTC3824HMSE#PBF
LTC3824HMSE#TRPBF
LTCGZ
10-Lead Plastic MSOP
–40°C to 150°C
LTC3824MPMSE#PBF
LTC3824MPMSE#TRPBF LTCGZ
10-Lead Plastic MSOP
–55°C to 150°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3824EMSE
LTC3824EMSE#TR
LTBRZ
10-Lead Plastic MSOP
–40°C to 125°C
LTC3824IMSE
LTC3824IMSE#TR
LTCGZ
10-Lead Plastic MSOP
–40°C to 125°C
LTC3824HMSE
LTC3824HMSE#TR
LTCGZ
10-Lead Plastic MSOP
–40°C to 150°C
LTC3824MPMSE
LTC3824MPMSE#TR
LTCGZ
10-Lead Plastic MSOP
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
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
Supply Voltage (V
CC
)
Supply Current (I
VCC
)
Supply Current (I
VCC
) Burst Mode Operation
Supply Current in Shutdown
CONDITIONS
l
elecTrical characTerisTics
MIN
4
TYP
0.8
40
9
V
C
≤ 0.4V (Switching Off), V
CC
≤ 60V
V
SYNC
= 0V (Burst Mode Operation Disable)
V
CC
≤ 60V, SYNC/MODE Open, V
C
= 0.6V
V
C
≤ 25mV, V
CC
≤ 60V
l
MAX
60
1.3
65
20
30
10
15
0.808
0.812
0.816
370
30
60
UNITS
V
mA
µA
µA
µA
µA
µA
V
V
V
µmho
nA
nA
V
3824fg
V
C
≤ 25mV, V
CC
= 12V
l
5
Voltage Amplifier gm
Reference Voltage (V
REF
)
Transconductance
FB Input Current
V
C
High
LTC3824E/LTC3824I
LTC3824MP/LTC3824H
V
C
= 0.8V,
∆I
VC
= ±2µA
V
FB
= V
REF
(Note 3): LTC3824E/LTC3824I
LTC3824MP/LTC3824H
I
VC
= 0
l
l
0.792
0.788
0.788
220
0.8
260
10
10
1.6
l
l
2
LTC3824
elecTrical characTerisTics
PARAMETER
V
C
Low
V
C
Source Current
V
C
Sink Current
V
C
Threshold for Switching Off
Soft-Start Current I
SS
V
C
Burst Mode Threshold
V
C
Burst Mode Threshold Hysteresis
SENSE Voltage at Burst Mode Operation
Current Limit Threshold (V
CC
–V
SENSE
)
FB Overvoltage Threshold
Sense Input Current
Oscillator
Switching Frequency
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.
CONDITIONS
I
VC
= 0
V
VC
= 0.5V to 1.3V, V
FB
= V
REF
–100mV (V
SYNC
= 0V)
V
VC
= 0.7V to 1.3V, V
FB
= V
REF
+100mV (V
SYNC
= 0V)
V
SYNC/MODE
= 0V (Note 4)
V
SS
= 0.1V to 1.5V
V
CC
≤ 60V, V
C
Rising, SYNC/MODE Open
V
CC
≤ 60V
(V
CC
–V
SENSE
) at 30% Duty Cycle
70% Duty Cycle
V
CC
≤ 60V: LTC3824E/LTC3824I
LTC3824MP/LTC3824H
V
C
= 1.6V
V
SENSE
= V
CC
R
SET
= 392k: LTC3824E/LTC3824I
LTC3824MP/LTC3824H
R
SET
= 200k
Rising Edge V
SYNC
R
SET
= 392k
R
SET
= 200k
R
SET
= 392k
CCM Operation (Note 5)
V
FB
= 0.3V
9V ≤ V
CC
≤ 60V, I
GATE
= 10mA: LTC3824E/LTC3824I
LTC3824MP/LTC3824H
V
CC
= 12V, I
GATE
= 15mA
4V ≤ V
CC
≤ 8V, I
GATE
= 10mA
6V ≤ V
CC
≤ 8V, I
GATE
= 15mA
4V ≤ V
CC
≤ 60V, I
GATE
= –15mA
C
GATE
= 10nF
8V ≤ V
CC
≤ 60V, I
GATE
= 15mA
4V ≤ V
CC
< 8V, I
GATE
= 10mA
C
GATE
= 10nF
MIN
TYP
0.35
15
15
5
0.84
0.04
30
20
100
100
8
0.1
200
200
400
MAX
0.5
UNITS
V
µA
µA
V
µA
µA
V
V
mV
mV
mV
mV
%
µA
kHz
kHz
kHz
V
kHz
kHz
V
ns
kHz
V
V
V
V
V
V
A
V
V
A
l
l
3
2.5
0.4
7.5
8
l
l
80
75
120
120
2
230
240
460
1.3
300
600
l
l
l
170
170
320
Synchronization Pulse Threshold
on SYNC Pin
Synchronization Frequency Range
V
RSET
Minimum On-Time (Measured at GATE Pin)
Switching Frequency Foldback
Gate Driver
GATE Bias Voltage (V
CC
–V
CAP
)
l
l
230
460
1.2
350
50
7.9
7.9
0.85
0.5
2.5
0.1
0.05
2.5
l
35
7.0
6.8
6.8
0.2
75
8.8
8.9
1.5
2.8
0.8
0.5
l
l
l
l
GATE Bias Voltage (V
CAP
–GND)
GATE High Voltage (V
CC
–V
GATE
)
GATE Peak Source Current
GATE Low Voltage (V
GATE
–V
CAP
)
GATE Peak Sink Current
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTC3824 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3824E is guaranteed to meet performance specifications
from 0°C to 85°C operating junction temperature. Specifications over
the –40°C to 125°C operating junction temperature range are assured by
design characterization and correlation with statistical process controls.
The LTC3824I is guaranteed over the –40°C to 125°C operating junction
temperature range. The LTC3824H is guaranteed over the –40°C to 150°C
operating junction temperature range. The LTC3824MP is guaranteed
and tested over the full –55°C to 150°C operating junction temperature
range. High junction temperatures degrade operating lifetimes; operating
lifetime is derated for junction temperatures greater than 125°C. Note that
the maximum ambient temperature consistent with these specifications
is determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors. The junction temperature (T
J
, in °C) is calculated from the ambient
temperature (T
A
, in °C) and power dissipation (P
D
, in Watts) according to
the formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
where
θ
JA
(in °C/W) is the package junction to ambient thermal
impedance.
3824fg
3
LTC3824
elecTrical characTerisTics
Note 3:
This parameter is tested in a feedback loop that servos V
FB
to the
reference voltage with the V
C
pin forced to 1V.
Note 4:
This specification represents the maximum voltage on V
C
where
switching (GATE pin) is guaranteed to be off. The nominal value of V
C
where switching turns off is 0.7V.
Note 5:
The LTC3824 typically enters Burst Mode operation when the load
is less than one third the current limit. If minimum on-time is violated,
cycle skipping may occur at higher current levels.
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