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LTC3803IS6#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3803
1
3803fc
TYPICAL APPLICATION
DESCRIPTION
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
The LTC
®
3803 is a constant frequency current mode fl yback
controller optimized for driving N-channel MOSFETs in high
input voltage applications. Constant frequency operation
is maintained down to very light loads, resulting in less
low frequency noise generation over a wide range of load
currents. Slope compensation can be programmed with
an external resistor.
The LTC3803 provides ±1.5% output voltage accuracy and
consumes only 240µA of quiescent current. Ground-refer-
enced current sensing allows LTC3803-based converters
to accept input supplies beyond the LTC3803’s absolute
maximum V
CC
. A micropower hysteretic start-up feature
allows effi cient operation at high input voltages. For sim-
plicity, the LTC3803 can also be powered from a high V
IN
through a resistor, due to its internal shunt regulator. An
internal undervoltage lockout shuts down the LTC3803
when the input voltage is too low to provide suffi cient
gate drive to the external MOSFET.
The LTC3803 is available in a low profi le (1mm) 6-lead
SOT-23 (ThinSOT™) package.
5V Output Nonisolated Telecom Housekeeping Power Supply
FEATURES
APPLICATIONS
n
V
IN
and V
OUT
Limited Only by External Components
n
Adjustable Slope Compensation
n
Internal Soft-Start
n
Constant Frequency 200kHz Operation
n
±1.5% Reference Accuracy
n
Current Mode Operation for Excellent Line and Load
Transient Response
n
No Minimum Load Requirement
n
Low Quiescent Current: 240µA
n
Low Profi le (1mm) SOT-23 Package
n
Telecom Power Supplies
n
42V and 12V Automotive Power Supplies
n
Auxiliary/Housekeeping Power Supplies
n
Power Over Ethernet
Effi ciency vs Load Current
V
CC
I
TH
/RUN
LTC3803
GND
NGATE
SENSE
V
FB
UPS840
300µF*
6.3V
X5R
4.7µF
100V
X5R
10µF
10V
X5R
V
OUT
5V
2A MAX
3803 TA01
68mΩ
20k
10k
56k
0.0022µF
105k
FDC2512
T1: COOPER CTX02-15242
*THREE 100µF UNITS IN PARALLEL
T1
•
•
V
IN
36V TO 72V
I
OUT
(A)
0.1
EFFICIENCY (%)
50
60
70
10
3803 TA02
40
30
0
1
20
10
90
80
V
IN
= 36V
V
IN
= 72V
V
IN
= 60V
V
IN
= 48V
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT and No R
SENSE
are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LTC3803
2
3803fc
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND
Low Impedance Source ........................... –0.3V to 8V
Current Fed ........................................25mA into V
CC
*
NGATE Voltage ............................................–0.3V to V
CC
V
FB
, I
TH
/RUN Voltages...............................–0.3V to 3.5V
SENSE Voltage .............................................–0.3V to 1V
NGATE Peak Output Current (<10µs) ......................... 1A
Operating Junction Temperature Range (Notes 2, 3)
LTC3803E, LTC3803I ..........................– 40°C to 125°C
LTC3803H ..........................................– 40°C to 150°C
LTC3803MP ....................................... –55°C to 150°C
Storage Temperature Range ...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
TURNON
V
CC
Turn On Voltage LTC3803E
LTC3803H, LTC3803I
LTC3803MP
l
l
l
7.8
7.7
7.6
8.7
8.7
8.7
9.2
9.25
9.5
V
V
V
V
TURNOFF
V
CC
Turn Off Voltage LTC3803E
LTC3803H, LTC3803I
LTC3803MP
l
l
l
4.6
4
4
5.7
5.7
5.7
6.8
6.8
7.25
V
V
V
V
HYST
V
CC
Hysteresis V
TURNON
– V
TURNOFF
LTC3803E, LTC3803I, LTC3803H
LTC3803MP
l
l
1.5
1
3.0
3.0
V
V
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)
ELECTRICAL CHARACTERISTICS
*LTC3803 internal clamp circuit self regulates V
CC
voltage to 9.5V.
PIN CONFIGURATION
I
TH
/RUN 1
GND 2
V
FB
3
6 NGATE
5 V
CC
4 SENSE
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C, θ
JA
= 192°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3803ES6#PBF LTC3803ES6#TRPBF LTACV 6-Lead Plastic TSOT-23 –40°C to 125°C
LTC3803IS6#PBF LTC3803IS6#TRPBF LTBNC 6-Lead Plastic TSOT-23 –40°C to 125°C
LTC3803HS6#PBF LTC3803HS6#TRPBF LTBNC 6-Lead Plastic TSOT-23 –40°C to 150°C
LTC3803MPS6#PBF LTC3803MPS6#TRPBF LTBNC 6-Lead Plastic TSOT-23 –55°C to 150°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3803ES6 LTC3803ES6#TR LTACV 6-Lead Plastic TSOT-23 –40°C to 125°C
LTC3803IS6 LTC3803IS6#TR LTBNC 6-Lead Plastic TSOT-23 –40°C to 125°C
LTC3803HS6 LTC3803HS6#TR LTBNC 6-Lead Plastic TSOT-23 –40°C to 150°C
LTC3803MPS6 LTC3803MPS6#TR LTBNC 6-Lead Plastic TSOT-23 –55°C to 150°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed 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 specifi cations, go to:
http://www.linear.com/tapeandreel/
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
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3803IS6#TRMPBF

Mfr. #:
Buy LTC3803IS6#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Flyback Controller in ThinSOT
Lifecycle:
New from this manufacturer.
Delivery:
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