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LTC3803-5 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3803-5
Description  Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3803-5 Datasheet(HTML) 1 Page - Linear Technology

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1
LTC3803-5
38035f
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
VIN and VOUT Limited Only by External Components
4.8V Undervoltage Lockout Threshold
Operating Junction Temperature from –40°C to
150°C
Adjustable Slope Compensation
Internal Soft-Start
Constant Frequency 200kHz Operation
±1.5% Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
No Minimum Load Requirement
Low Quiescent Current: 240µA
Low Profile (1mm) SOT-23 Package
42V and 12V Automotive Power Supplies
Telecom Power Supplies
Auxiliary/Housekeeping Power Supplies
Power Over Ethernet
ThinSOT is a trademark of Linear Technology Corporation.
Dual Output Wide Input Range Converter
The LTC
®3803-5 is a constant frequency current mode
flyback controller optimized for driving 4.5V and 6V-rated
N-channel MOSFETs in high input voltage applications.
The LTC3803-5 operates from inputs as low as 5V. Con-
stant 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 VCC. For simplicity, the LTC3803-5
can be powered from a high VIN through a resistor, due to
its internal 8V shunt regulator. An internal undervoltage
lockout shuts down the IC when the input voltage falls
below 3.2V, guaranteeing at least 3.2V of gate drive to the
external MOSFET.
The LTC3803-5 is available in a low profile (1mm) 6-lead
SOT-23 (ThinSOT
TM) package.
Efficiency and Power Loss
vs Output Power
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
ITH/RUN
GND
VFB
LTC3803-5
NGATE
VCC
SENSE
10MQ100N
B3100
1µF
100V
3x
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
VIN
6V TO 50V
MMBTA42
22µF
10V
47µF
10V
PDZ9.1B
VPH5-0155
OUTPUT POWER (W)
02
90
85
80
75
70
65
60
3.0
2.5
2.0
1.5
1.0
0.5
0
4
68
10
38035 TA01b
12
VIN = 8V
VIN = 12V
VIN = 12V
VIN = 24V
VIN = 48V


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