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参数资料
| 型号： | L5973DD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, HSOP-8 |
| 文件页数： | 1/17页 |
| 文件大小： | 252K |
| 代理商： | L5973DD |
May 2006
Rev 11
1/17
17
L5973D
2.5A switch step down switching regulator
General features
■ 2.5A Internal switch
■ Operating input voltage from 4V to 36V
■ 3.3V / (±2%) reference voltage
■ Output voltage adjustable from 1.235V to 35V
■ Low dropout operation: 100% duty cycle
■ 250KHz Internally fixed frequency
■ Voltage feedforward
■ Zero load current operation
■ Internal current limiting
■ Inhibit for zero current consumption
■ Synchronization
■ Protection against feedback disconnection
■ Thermal shutdown
Applications
■ Consumer: STB, DVD, TV, VCR, car radio,
LCD monitors
■ Networking: XDSL, modems, DC-DC modules
■ Computer: printers, audio/graphic cards,
optical storage, hard disk drive
■ Industrial: changers, car battery, DC-DC
converters
Description
The L5973D is a step down monolithic power
switching regulator with a minimum switch current
limit of 2.5A so it is able to deliver more than 2A
DC current to the load depending on the
application conditions.
The output voltage can be set from 1.235V to
35V.
The high current level is also achieved thanks to
an SO8 package with exposed frame, that allows
to reduce the Rth(j-amb) down to approximately
40°C/W.
The device uses an internal P-Channel D-MOS
transistor (with a typical Rdson of 250mW) as
switching element to minimize the size of the
external components.
An internal oscillator fixes the switching frequency
at 250KHz.
Having a minimum input voltage of 4V only, it is
particularly suitable for 5V bus, available in all
computer related applications.
Pulse by pulse current limit with the internal
frequency modulation offers an effective constant
current short circuit protection.
HSOP8 Exposed Pad
Test application circuit
D03IN1439
8
4
5
1
7
L5973D
C1
10
F
35V
CERAMIC
C2
330
F
10V
VOUT=3.3V
VIN = 4.4V to 35V
R1
5.6K
R2
3.3K
R3
4.7K
C4
22nF
C3
220pF
3
L1 15
H
D1
STPS340U
COMP
VCC
OUT
FB
GND
INH
2
6
3.3V
SYNC.
VREF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L5974AD | 功能描述:直流/直流开关调节器 2A SD switch reg BCD5 220nF 5V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5974ADTR | 功能描述:直流/直流开关调节器 2A SD switch reg BCD5 220nF 5V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5974D | 功能描述:直流/直流开关调节器 2.5A SD switch reg BCD5 220nF 5V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5974DTR | 功能描述:直流/直流开关调节器 2.5A SD switch reg BCD5 220nF 5V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5975AD | 功能描述:直流/直流开关调节器 2.5A SD switch reg BCD5 220nF 5V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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