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| 型号： | LT3439EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG PSH-PLL CTRLR ISO 16TSSOP |
| 标准包装： | 95 |
| 类型： | 推挽式控制器，隔离式 |
| 输出数： | 1 |
| 输入电压： | 2.8 V ~ 17.5 V |
| 频率 - 开关： | 20kHz ~ 250kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3439
Slew Rate Controlled
Ultralow Noise1A Isolated
DC/DC Transformer Driver
FEATURES
DESCRIPTIO
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s
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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 μ A
50% Duty Cycle
20kHz to 250kHz Oscillator Frequency
Synchronizable to 300kHz
Overcurrent and Overtemperature Protected
The LT ? 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-
APPLICATIO S
tion features include current limiting, undervoltage lock-
out, thermal shutdown and cross conduction prevention
s
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Low Noise Isolated Supplies
Radio and Telecom Supplies
Distributed Supplies
Medical Instruments
Precision Instruments
Low Noise Filament Supplies
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.
TYPICAL APPLICATIO
Low Noise 5V to 5V Push-Pull DC/DC Transformer
5V Output Noise
OPTIONAL
L1 33 μ H
500mA
V IN
5V
C IN
22 μ F
10V
11
5
6
680pF 7
16.9k
13
V IN
SHDN COL A
LT3439
SYNC COL B
C T
R T R SL
GND PGND
3
14
4
?
?
34k
T1
?
?
D1
D2
A B V OUT
5V
C1 C2
47 μ F 47 μ F
6.3V 6.3V
C IN : MURATA GRM235Y5V226Z10
C1, C2: TDK C4532X5R0J476M
D1, D2: MBR0520
L1: TDK SLF6028T-330MR69
B
200 μ V/DIV
A
20mV/DIV
10
1, 16
T1: COILTRONICS 15835
3439 TA01
5 μ s/DIV
3439 TA01b
sn3439 3439fs
1
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