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参数资料
| 型号： | L5973AD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2.3 A SWITCHING REGULATOR, PDSO8 |
| 封装： | EXPOSED PAD, HSOP-8 |
| 文件页数： | 1/22页 |
| 文件大小： | 486K |
| 代理商： | L5973AD |
November 2009
Doc ID 9552 Rev 9
1/22
22
L5973AD
2 A switch step down switching regulator
Features
■ 2 A internal switch
■ Operating input voltage from 4 V to 36 V
■ 3.3 V / (±2%) reference voltage
■ Output voltage adjustable from 1.235 V to 35 V
■ Low dropout operation: 100% duty cycle
■ 500 kHz 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: chargers, car battery, DC-DC
converters
Description
The L5973AD is a step down monolithic power
switching regulator with a switch current limit of
2 A so it is able to deliver more than 1.5 A DC
current to the load depending on the application
conditions.
The output voltage can be set from 1.235 V
to 35 V. The high current level is also achieved
thanks to an SO8 package with exposed frame,
that allows to reduce the RthJA down to
approximately 40 °C/W.
The device uses an internal P-Channel D-MOS
transistor (with a typical of 200 m
Ω) as switching
element to avoid the use of bootstrap capacitor
and guarantee high efficiency.
An internal oscillator fixes the switching frequency
at 500 kHz to minimize the size of external
components.
Having a minimum input voltage of 4 V only, it is
particularly suitable for 5 V 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
Figure 1.
Test application circuit
D03IN1453
8
4
5
1
7
L5973AD
C1
10
μF
35V
CERAMIC
C2
330
μF
10V
VOUT=3.3V
VIN = 4V to 35V
R1
5.6K
R2
3.3K
R3
4.7K
C4
22nF
C3
220pF
3
L1 15
μH
D1
STPS340U
COMP
VCC
OUT
FB
GND
INH
2
6
3.3V
SYNC.
VREF
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| L5980TR | 1.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L5973AD_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2A switch step down switching regulator |
| L5973AD_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2 A switch step down switching regulator |
| L5973ADTR | 功能描述:直流/直流开关调节器 1.235 to 35V Step-Dn 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 |
| L5973D | 功能描述:开关变换器、稳压器与控制器 1.235 to 35V Step-Dn RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L5973D_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2.5 A switch step down switching regulator?癎 |
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