900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC3873ETS8 Datasheet

Boost/Flyback/SEPIC DC/DC Controller

No Preview Available !

LTC3873
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 Maximum 60V on SW Node with RDS(ON) Sensing
n ±1.5% Voltage Reference Accuracy
n Current Mode Operation for Excellent Line and Load
Transient Response
n Low Quiescent Current: 300µA
n Low Profile (1mm) ThinSOTTM and (0.75mm)
2mm × 3mm DFN Package
APPLICATIONS
n Telecom Power Supplies
n 42V and 12V Automotive Power Supplies
n Portable Electronic Equipment
DESCRIPTION
The LTC®3873 is a constant frequency current mode,
boost, flyback or SEPIC DC/DC controller that drives an
N-channel power MOSFET in high input and output volt-
age converter applications. Soft-start can be programmed
using an external capacitor.
The LTC3873 provides ±1.5% output voltage accuracy and
consumes only 300μA quiescent current during normal
operation and only 55μA during micropower start-up.
Using a 9.3V internal shunt regulator, the LTC3873 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.
The LTC3873 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
4.7µF
100V
X5R
7.5k
2.2nF
5V Output Nonisolated Telecom Power Supply
10µF
10V
X5R
0.1µF
VIN
36V TO 72V
221k
D2
T1
D1
VCC
ITH NGATE
LTC3873
RUN/SS
GND
SW
IPRG
VFB
12.1k
38.3k
M1
68mΩ
100µF
6.3V
X5R
×3
VOUT
5V
2A MAX
3873 TA01a
Efficiency and Power Loss vs Load Current
100
3000
90
EFFICIENCY
80
2500
70
2000
60
50
40
30
20
10
0
10
POWER LOSS
1500
1000
VIN = 72V
VIN = 60V 500
VIN = 48V
VIN = 36V
10
1000
LOAD CURRENT (mA)
3873 TA01b
For more information www.linear.com/LTC3873
3873fb
1


Linear Technology Electronic Components Datasheet

LTC3873ETS8 Datasheet

Boost/Flyback/SEPIC DC/DC Controller

No Preview Available !

LTC3873
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).... –40°C to 85°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 × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
(http://www.linear.com/product/LTC3873#orderinfo)
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3873ETS8#PBF
LTC3873ETS8\#TRPBF LTCSN
8-Lead Plastic TSOT-23
–40°C to 85°C
LTC3873EDDB#PBF
LTC3873EDDB#TRPBF LCSK
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3873ETS8
LTC3873ETS8#TR
LTCSN
8-Lead Plastic TSOT-23
–40°C to 85°C
LTC3873EDDB
LTC3873EDDB#TR
LCSK
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3873fb
2
For more information www.linear.com/LTC3873


Part Number LTC3873ETS8
Description Boost/Flyback/SEPIC DC/DC Controller
Maker Linear Technology
PDF Download

LTC3873ETS8 Datasheet PDF






Similar Datasheet

1 LTC3873ETS8 Boost/Flyback/SEPIC DC/DC Controller
Linear Technology
2 LTC3873ETS8-5 Boost/Flyback/SEPIC DC/DC Controller
Linear Technology





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy