LT3439EFE#PBF Linear Technology, LT3439EFE#PBF Datasheet

IC PUSH-PULL CNTRLR SYNC 16TSSOP

LT3439EFE#PBF

Manufacturer Part Number
LT3439EFE#PBF
Description
IC PUSH-PULL CNTRLR SYNC 16TSSOP
Manufacturer
Linear Technology
Type
Push-Pull Controllerr
Datasheet

Specifications of LT3439EFE#PBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Current - Output
1A
Frequency - Switching
20kHz ~ 250kHz
Voltage - Input
2.8 ~ 17.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
Primary Input Voltage
17.5V
No. Of Outputs
1
Output Voltage
35V
Output Current
1A
No. Of Pins
16
Operating Temperature Range
-40°C To +125°C
Msl
MSL 1 - Unlimited
Rohs Compliant
Yes
Pin Count
16
Input Voltage
17.5V
Switching Freq
20 to 250KHz
Package Type
TSSOP EP
Output Type
Adjustable
Switching Regulator
Yes
Mounting
Surface Mount
Input Voltage (min)
2.8V
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Power - Output
-
Lead Free Status / Rohs Status
Compliant

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Part Number
Manufacturer
Quantity
Price
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Part Number:
LT3439EFE#PBFLT3439EFE
Manufacturer:
LT
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0
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
V
5V
IN
Low Noise Isolated Supplies
Radio and Telecom Supplies
Distributed Supplies
Medical Instruments
Precision Instruments
Low Noise Filament Supplies
Reduced Conducted and Radiated EMI
Single Resistor Control of Output Switch Voltage
and Current Slew Rates
Cross Conduction Prevention Circuitry
Two 1A Current Limited Power Switches
Low Minimum Supply Voltage: 2.8V
Low Shutdown Current: < 20 A
50% Duty Cycle
20kHz to 250kHz Oscillator Frequency
Synchronizable to 300kHz
Overcurrent and Overtemperature Protected
C
22 F
10V
IN
680pF
16.9k
11
5
6
7
Low Noise 5V to 5V Push-Pull DC/DC Transformer
SHDN
SYNC
C
R
T
T
GND
U
10
LT3439
V
IN
13
PGND
COL A
COL B
1, 16
R
SL
3
14
4
34k
U
3439 TA01
T1
D1
D2
A
C
C1, C2: TDK C4532X5R0J476M
D1, D2: MBR0520
L1: TDK SLF6028T-330MR69
T1: COILTRONICS 15835
IN
C1
47 F
6.3V
: MURATA GRM235Y5V226Z10
L1 33 H
OPTIONAL
47 F
6.3V
C2
DESCRIPTIO
The LT
reduces conducted and radiated electromagnetic interfer-
ence (EMI). Ultralow noise and EMI are achieved by
controlling the output switch voltage and current slew
rates. Slew rates are user adjustable to optimize output
noise versus efficiency. The LT3439 can reduce high
frequency harmonic content by as much as 40dB with only
a minor decrease in efficiency.
The LT3439 includes two 1A current limited power switches
to ensure start-up under heavy loads. It also includes an
oscillator that can be synchronized to an external clock for
more accurate placement of switcher harmonics. Protec-
tion features include current limiting, undervoltage lock-
out, thermal shutdown and cross conduction prevention
circuitry.
The LT3439 is available in a thermally enhanced 16-pin
TSSOP with an exposed backside.
B
DC/DC Transformer Driver
, LTC and LT are registered trademarks of Linear Technology Corporation.
Ultralow Noise1A Isolated
®
V
5V
500mA
3439 is a push-pull DC/DC transformer driver that
OUT
Slew Rate Controlled
200 V/DIV
20mV/DIV
U
B
A
5V Output Noise
5 s/DIV
LT3439
sn3439 3439fs
3439 TA01b
1

Related parts for LT3439EFE#PBF

LT3439EFE#PBF Summary of contents

Page 1

... Protec- tion features include current limiting, undervoltage lock- out, thermal shutdown and cross conduction prevention circuitry. The LT3439 is available in a thermally enhanced 16-pin TSSOP with an exposed backside. , LTC and LT are registered trademarks of Linear Technology Corporation. OPTIONAL ...

Page 2

LT3439 ABSOLUTE AXI U RATI GS (Note 1) V Voltage ............................................................. 20V IN COL A, COL B Voltage ............................................. 35V SHDN, SYNC Voltage .............................................. 20V Maximum Junction Temperature ......................... 150 C Operating Junction Temperature Range (Note 2) ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS Minimum Input Voltage vs Temperature 2.750 2.700 2.650 2.600 2.550 2.500 2.450 2.400 2.350 2.300 –50 – 100 125 150 TEMPERATURE ( C) 3439 G01 Switch Voltage Drop vs ...

Page 4

LT3439 CTIO S PGND (Pins 1, 16): Power ground is connected to the emitter of the power switches via an internal sense resis- tor. It has large currents flowing through it and should be connected ...

Page 5

W BLOCK DIAGRA SHDN V IN LDO REGULATOR INTERNAL OSCILLATOR SYNC 5 U OPERATIO Push-Pull Topology The push-pull DC transformer topology is a very ...

Page 6

LT3439 U OPERATIO vary from 2.8V to 17.5V with very little change in device performance. When the part is in shutdown mode, the internal regulator is turned off, drawing less than current from Overcurrent ...

Page 7

... Note that slower slewing waveforms will lower the power supply efficiency. Consult Linear Technology Appli- cation Note 70, “A Monolithic Switching Regulator with 100 V Output Noise” for recommended noise measure- ment techniques ...

Page 8

LT3439 U U APPLICATIO S I FOR ATIO mean greater switching losses in the internal output switches. However, efficiency is only modestly reduced for a large improvement in EMI. Care should be taken to ensure that the worst-case input voltage ...

Page 9

U U APPLICATIO S I FOR ATIO current. This can be accomplished by adding more turns onto a given core or selecting a new core with a higher inductance per turn squared characteristic (A The following equation can be used ...

Page 10

... AN19: “LT1070 Design Manual” AN29: “Some Thoughts on DC-DC Converters” also have general knowledge on switching regulators. An LTC SwitcherCAD performance. The LTC Applications department is always ready to lend a helping hand. SwitcherCAD is a trademark of Linear Technology Corporation. = 10kHz where: CORNER 1 2 • model is available to verify design ...

Page 11

... DRAWING NOT TO SCALE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. Low Noise 5V to 12V Push-Pull DC Transformer ...

Page 12

... LT1962 300mA, Low Noise Micropower, LDO LT1963/LT1963A 1.5A, Low Noise, Fast Transient Response, LDOs LT1964 200mA, Low Noise Micropower, Negative LDO ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 • ...

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