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Linear Technology Electronic Components Datasheet

LTC3873ITS8-5 Datasheet

Boost/Flyback/SEPIC DC/DC Controller

No Preview Available !

LTC3873-5
No RSENSETM Constant
Frequency Current Mode
Boost/Flyback/SEPIC
DC/DC Controller
FEATURES
n VIN and VOUT Limited Only by External Components
n Internal or Programmable External Soft-Start
n Constant Frequency 200kHz Operation
n Adjustable Current Limit
n Current Sense Resistor Optional
n ±1.5% Voltage Reference Accuracy
n Current Mode Operation for Excellent Line and Load
Transient Response
n 4.1V Undervoltage Threshold for Logic Level
MOSFET Applications
n Low Quiescent Current: 300μA
n Low Profile (1mm) ThinSOTTM and (0.75mm)
2mm × 3mm DFN Package
APPLICATIONS
n Telecom Power Supplies
n Automotive Power Supplies
n PoE Applications
DESCRIPTION
The LTC®3873-5 is a constant frequency current mode
controller for boost, flyback or SEPIC DC/DC converters
designed to drive an N-channel MOSFET for high input
and output voltage converter applications.
The LTC3873-5 provides ±1.5% output voltage accuracy
and consumes only 300μA quiescent current during nor-
mal operation and only 50μA during micropower start-up.
Using a 9.3V internal shunt regulator, the LTC3873-5 can
be powered from a high input voltage through a resistor
or it can be powered directly from a low impedance DC
voltage of 9V or less. Soft-start can be programmed using
an external capacitor.
The LTC3873-5 is available in 8-lead ThinSOT and 2mm
× 3mm DFN packages.
PARAMETER
VCC UV+
VCC UV
LTC3873
8.4V
4V
LTC3873-5
4.1V
2.9V
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No RSENSE and ThinSOT are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
High Efficiency 5V Input, 12V Output Boost Converter
4.7nF
11.8k
47pF
12k
1nF
RUN/SS
ITH
VCC
LTC3873-5
IPRG
GND
SW
VFB
NGATE
108k
10μH
10μF
22μF
VIN
5V
VOUT
12V
2A
38735 TA01a
Efficiency and Power Loss vs Load Current
100
90
80
70
60
50
40
30
20
10
0
10
10000
1000
100
100
IOUT (mA)
10
1000
3873 TA01b
38735fb
1


Linear Technology Electronic Components Datasheet

LTC3873ITS8-5 Datasheet

Boost/Flyback/SEPIC DC/DC Controller

No Preview Available !

LTC3873-5
ABSOLUTE MAXIMUM RATINGS (Note 1)
VCC to GND
Low Impedance Source ........................... –0.3V to 9V
Current Fed ..........................................25mA Into VCC
RUN/SS........................................................ –0.3V to 9V
IPRG Voltage.................................–0.3V to (VCC + 0.3V)
VFB, ITH Voltages ....................................... –0.3V to 2.4V
SW Voltage ................................................ –0.3V to 60V
Operating Temperature Range (Note 2)
LTC3873E-5 ......................................... –40°C to 85°C
LTC3873I-5 ........................................ –40°C to 125°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
TS8 Package ..................................................... 300°C
PIN CONFIGURATION
TOP VIEW
IPRG 1
ITH 2
VFB 3
GND 4
8 SW
7 RUN/SS
6 VCC
5 NGATE
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 230°C/W
TOP VIEW
GND 1
8 NGATE
VFB 2
9
7 VCC
ITH 3
6 RUN/SS
IPRG 4
5 SW
DDB PACKAGE
8-LEAD (3mm s 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3873ETS8-5#PBF
LTC3873ETS8-5#TRPBF LTCSP
8-Lead Plastic TSOT-23
–40°C to 85°C
LTC3873ITS8-5#PBF
LTC3873ITS8-5#TRPBF LTCSP
8-Lead Plastic TSOT-23
–40°C to 125°C
LTC3873EDDB-5#PBF
LTC3873EDDB-5#TRPBF LCSM
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
LTC3873IDDB-5#PBF
LTC3873IDDB-5#TRPBF LCSM
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3873ETS8-5
LTC3873ETS8-5#TR
LTCSP
8-Lead Plastic TSOT-23
–40°C to 85°C
LTC3873ITS8-5
LTC3873ITS8-5#TR
LTCSP
8-Lead Plastic TSOT-23
–40°C to 125°C
LTC3873EDDB-5
LTC3873EDDB-5#TR
LCSM
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
LTC3873IDDB-5
LTC3873IDDB-5#TR
LCSM
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°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/
38735fb
2


Part Number LTC3873ITS8-5
Description Boost/Flyback/SEPIC DC/DC Controller
Maker Linear Technology
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