参数资料
型号: L7981TR
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: SWITCHING REGULATOR, DSO8
封装: 3 X 3 MM, 1.08 MM HEIGHT, ROHS COMPLIANT, VFQFP-8
文件页数: 1/44页
文件大小: 1315K
代理商: L7981TR
July 2010
Doc ID 15182 Rev 3
1/44
44
L7981
3 A step-down switching regulator
Features
3 A DC output current
4.5 V to 28 V input voltage
Output voltage adjustable from 0.6 V
250 kHz switching frequency, programmable
up to 1 MHz
Internal soft-start and enable
Low dropout operation: 100% duty cycle
Voltage feed-forward
Zero load current operation
Overcurrent and thermal protection
VFQFPN3x3-8L and HSOP8 package
Applications
Consumer:
STB, DVD, DVD recorder, car audio, LCD TV
and monitors
Industrial:
PLD, PLA, FPGA, chargers
Networking: XDSL, modems, DC-DC modules
Computer:
Optical storage, hard disk drive, printers,
audio/graphic cards
Suitable for LED driving
Description
The L7981 is a step down switching regulator with
3.7 A (minimum) current limited embedded power
MOSFET, so it si able to deliver up to 3 A current
to the load depending on the application
conditions.
The input voltage can range from 4.5 V to 28 V,
while the output voltage can be set starting from
0.6 V to VIN.
Requiring a minimum set of external components,
the device includes an internal 250 kHz switching
frequency oscillator that can be externally
adjusted up to 1 MHz.
The QFN and the HSOP packages with exposed
pad allow reducing the RthJA down to 60°C/W and
40°C/W respectively.
Figure 1.
Application circuit
HSOP8 exposed pad
VFQFPN8 3x3
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相关代理商/技术参数
参数描述
L7983 制造商:Leviton Manufacturing Co 功能描述:
L7985 功能描述:线性稳压器 - 标准 2A Step Down REG 4.5V to 38V 250 KHz RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L
L7985A 功能描述:直流/直流开关调节器 2A DC 4.5V to 38V 250 KHz Step-Down 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
L7985ATR 功能描述:线性稳压器 - 标准 2A Step-Down REG 2A DC 4.5 to 38V RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L
L7985TR 功能描述:线性稳压器 - 标准 2A Step-Down Reg 4.5V to 38V 250 KHz RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L