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LTC3803MPS6-5#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3803-5
1
38035fd
TYPICAL APPLICATION
DESCRIPTION
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
The LTC
®
3803-5 is a constant frequency current mode
fl yback controller optimized for driving N-channel MOSFETs
in high input voltage applications. The LTC3803-5 operates
from inputs as low as 5V. 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 LTC3803-5 provides ±1.5% output voltage accuracy
and consumes only 240μA of quiescent current. Ground-
referenced current sensing allows LTC3803-5-based con-
verters to accept input supplies beyond the LTC3803-5’s
absolute maximum V
CC
. For simplicity, the LTC3803-5 can
be powered from a high V
IN
through a resistor, due to its
internal shunt regulator. An internal undervoltage lockout
shuts down the IC when the input voltage is too low to
provide suffi cient gate drive to the external MOSFET.
The LTC3803-5 is available in a low profi le (1mm) 6-lead
SOT-23 (ThinSOT™) package.
Dual Output Wide Input Range Converter
FEATURES
APPLICATIONS
n
V
IN
and V
OUT
Limited Only by External Components
n
4.8V Undervoltage Lockout Threshold
n
Operating Junction Temperature from –55°C to
150°C
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
42V and 12V Automotive Power Supplies
n
Telecom Power Supplies
n
Auxiliary/Housekeeping Power Supplies
n
Power Over Ethernet
Effi ciency and Power Loss
vs Output Power
I
TH
/RUN
GND
V
FB
LTC3803-5
NGATE
V
CC
SENSE
10MQ100N
B3100
1μF
100V
×3
13V/0.3A
20mA MIN
LOAD
6.5V/1.2A
38035 TA01
0.012Ω
0.1μF
22k
7.5k
57.6k
8.06k
4.7k
10nF
1μF
100V
1μF
100V
PHM25NQ10T
ALL CAPACITORS ARE X7R, TDK
V
IN
6V TO 50V
MMBTA42
22μF
10V
47μF
10V
PDZ6.8B
VPH5-0155
OUTPUT POWER (W)
02
EFFICIENCY (%)
POWER LOSS (W)
90
85
80
75
70
65
60
3.0
2.5
2.0
1.5
1.0
0.5
0
4
6810
38035 TA01b
12
V
IN
= 8V
V
IN
= 12V
V
IN
= 12V
V
IN
= 24V
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.
LTC3803-5
2
38035fd
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
V
CC
to GND (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-5 .......................................– 40°C to 125°C
LTC3803I-5 ........................................– 40°C to 125°C
LTC3803H-5 (Note 3) ......................... –40°C to 150°C
LTC3803MP-5 (Note 3) ...................... –55°C to 150°C
Storage Temperature Range ...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
ORDER INFORMATION
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
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3803ES6-5#PBF LTC3803ES6-5#TRPBF LTBPF 6-Lead Low Profi le (1mm) SOT-23 –40°C to 125°C
LTC3803IS6-5#PBF LTC3803IS6-5#TRPBF LTBMH 6-Lead Low Profi le (1mm) SOT-23 –40°C to 125°C
LTC3803HS6-5#PBF LTC3803HS6-5#TRPBF LTBMH 6-Lead Low Profi le (1mm) SOT-23 –40°C to 150°C
LTC3803MPS6-5#PBF LTC3803MPS6-5#TRPBF LTBMH 6-Lead Low Profi le (1mm) SOT-23 –55°C to 150°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3803ES6-5 LTC3803ES6-5#TR LTBPF 6-Lead Low Profi le (1mm) SOT-23 –40°C to 125°C
LTC3803IS6-5 LTC3803IS6-5#TR LTBMH 6-Lead Low Profi le (1mm) SOT-23 –40°C to 125°C
LTC3803HS6-5 LTC3803HS6-5#TR LTBMH 6-Lead Low Profi le (1mm) SOT-23 –40°C to 150°C
LTC3803MPS6-5 LTC3803MPS6-5#TR LTBMH 6-Lead Low Profi le (1mm) SOT-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/
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
TURNON
V
CC
Turn On Voltage LTC3803E-5
LTC3803I-5, LTC3803H-5, LTC3803MP-5
l
l
4
3.9
4.8
4.8
5.7
5.7
V
V
V
TURNOFF
V
CC
Turn Off Voltage LTC3803E-5
LTC3803I-5, LTC3803H-5, LTC3803MP-5
l
l
3.3
3.2
4
4
4.9
4.9
V
V
V
HYST
V
CC
Hysteresis V
TURNON
– V
TURNOFF
l
0.05 0.8 V
V
CLAMP1mA
V
CC
Shunt Regulator Voltage at 1mA I
CC
= 1mA, V
ITH/RUN
= 0V
LTC3803E-5
LTC3803I-5, LTC3803H-5
LTC3803MP-5
l
l
l
6.2
6.2
5.9
8
8
8
9.9
10.4
10.4
V
V
V
*LTC3803-5 internal clamp circuit self regulates V
CC
voltage to 8.1V.
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
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3803MPS6-5#TRPBF

Mfr. #:
Buy LTC3803MPS6-5#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT
Lifecycle:
New from this manufacturer.
Delivery:
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