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LT3439EFE Datasheet

  • LT3439EFE

  • Slew Rate Controlled Ultralow Noise1A Isolated DC/DC Transfo...

  • 189.80KB

  • 12頁

  • LINER

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LT3439
Slew Rate Controlled
Ultralow Noise1A Isolated
DC/DC Transformer Driver
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
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碌A(chǔ)
50% Duty Cycle
20kHz to 250kHz Oscillator Frequency
Synchronizable to 300kHz
Overcurrent and Overtemperature Protected
The LT
廬
3439 is a push-pull DC/DC transformer driver that
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
Low Noise Isolated Supplies
Radio and Telecom Supplies
Distributed Supplies
Medical Instruments
Precision Instruments
Low Noise Filament Supplies
TYPICAL APPLICATIO
Low Noise 5V to 5V Push-Pull DC/DC Transformer
5V Output Noise
OPTIONAL
V
IN
5V
T1
C
IN
22碌F
10V
13
11
5
6
680pF 7
16.9k
V
IN
SHDN
SYNC
C
T
R
T
GND
10
R
SL
PGND
1, 16
3439 TA01
D1
A
C1
47碌F
6.3V
L1 33碌H
C2
47碌F
6.3V
B
鈥?/div>
3
鈥?/div>
鈥?/div>
V
OUT
5V
500mA
COL A
LT3439
COL B
鈥?/div>
14
4
34k
B
200碌V/DIV
D2
C
IN
: MURATA GRM235Y5V226Z10
C1, C2: TDK C4532X5R0J476M
D1, D2: MBR0520
L1: TDK SLF6028T-330MR69
T1: COILTRONICS 15835
A
20mV/DIV
U
5碌s/DIV
3439 TA01b
U
U
sn3439 3439fs
1

LT3439EFE 產(chǎn)品屬性

  • LT3439

  • 95

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器

  • -

  • 推挽式控制器，隔離式

  • -

  • 1

  • -

  • 2.8 V ~ 17.5 V

  • -

  • 20kHz ~ 250kHz

  • 1A

  • 無

  • -40°C ~ 125°C

  • 表面貼裝

  • 16-TSSOP（0.173"，4.40mm）裸露焊盤

  • 管件

  • 16-TSSOP-EP

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