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Linear Technology Electronic Components Datasheet

LTC3803MPS6 Datasheet

Flyback DC/DC Controller

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LTC3803
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
FEATURES
n VIN and VOUT 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 Profile (1mm) SOT-23 Package
APPLICATIONS
n Telecom Power Supplies
n 42V and 12V Automotive Power Supplies
n Auxiliary/Housekeeping Power Supplies
n Power Over Ethernet
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT and No RSENSE are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
DESCRIPTION
The LTC®3803 is a constant frequency current mode flyback
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 VCC. A micropower hysteretic start-up feature
allows efficient operation at high input voltages. For sim-
plicity, the LTC3803 can also be powered from a high VIN
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 sufficient
gate drive to the external MOSFET.
The LTC3803 is available in a low profile (1mm) 6-lead
SOT-23 (ThinSOT™) package.
TYPICAL APPLICATION
5V Output Nonisolated Telecom Housekeeping Power Supply
10μF
10V
X5R
56k
0.0022μF
VIN
36V TO 72V
10k
UPS840
T1
4.7μF
100V
X5R
VCC
ITH/RUN NGATE
LTC3803
GND SENSE
VFB
FDC2512
68mΩ
300μF*
6.3V
X5R
VOUT
5V
2A MAX
20k 105k
3803 TA01
T1: COOPER CTX02-15242
*THREE 100μF UNITS IN PARALLEL
Efficiency vs Load Current
90
80 VIN = 36V
70
VIN = 48V
60
VIN = 60V
50
40
VIN = 72V
30
20
10
0
0.1
1
IOUT (A)
10
3803 TA02
3803fc
1


Linear Technology Electronic Components Datasheet

LTC3803MPS6 Datasheet

Flyback DC/DC Controller

No Preview Available !

LTC3803
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VCC to GND
Low Impedance Source ........................... –0.3V to 8V
Current Fed ........................................25mA into VCC*
NGATE Voltage............................................–0.3V to VCC
VFB, ITH/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
*LTC3803 internal clamp circuit self regulates VCC voltage to 9.5V.
PIN CONFIGURATION
TOP VIEW
ITH/RUN 1
GND 2
VFB 3
6 NGATE
5 VCC
4 SENSE
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 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
LTC3803ES6
TAPE AND REEL
LTC3803ES6#TR
PART MARKING*
LTACV
PACKAGE DESCRIPTION
6-Lead Plastic TSOT-23
TEMPERATURE RANGE
–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 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/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VCC = 8V, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VTURNON
VCC Turn On Voltage
LTC3803E
LTC3803H, LTC3803I
LTC3803MP
l 7.8
8.7
9.2
V
l 7.7
8.7
9.25
V
l 7.6
8.7
9.5
V
VTURNOFF
VCC Turn Off Voltage
LTC3803E
LTC3803H, LTC3803I
LTC3803MP
l 4.6
5.7
6.8
V
l
4
5.7
6.8
V
l
4
5.7
7.25
V
VHYST
VCC Hysteresis
VTURNON – VTURNOFF
LTC3803E, LTC3803I, LTC3803H
l 1.5
3.0
V
LTC3803MP
l
1
3.0
V
3803fc
2


Part Number LTC3803MPS6
Description Flyback DC/DC Controller
Maker Linear Technology
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LTC3803MPS6 Datasheet PDF






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