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| 型号： | LM34919BQTLX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PBGA10 |
| 封装： | MICRO, SMD-10 |
| 文件页数： | 1/20页 |
| 文件大小： | 488K |
| 代理商： | LM34919BQTLX |
LM34919B
May 26, 2010
Ultra Small 40V, 600 mA Constant On-Time Buck Switching
Regulator
General Description
The LM34919B Step Down Switching Regulator features all
of the functions needed to implement a low cost, efficient,
buck bias regulator capable of supplying 0.6A to the load. This
buck regulator contains an N-Channel Buck Switch, and is
available in a micro SMD package. The constant on-time
feedback regulation scheme requires no loop compensation,
results in fast load transient response, and simplifies circuit
implementation. The operating frequency remains constant
with line and load variations due to the inverse relationship
between the input voltage and the on-time. The valley current
limit results in a smooth transition from constant voltage to
constant current mode when current limit is detected, reduc-
ing the frequency and output voltage, without the use of
foldback. Additional features include: VCC under-voltage
lockout, thermal shutdown, gate drive under-voltage lockout,
and maximum duty cycle limiter.
Features
■ AEC-Q100 Grade 1 qualified (-40°c to 125°c)
■ Maximum switching frequency: 2.6 MHz
(V
IN=14V,Vo=3.3V)
■ Input Voltage Range: 6V to 40V
■ Integrated N-Channel buck switch
■ Integrated start-up regulator
■ No loop compensation required
■ Ultra-Fast transient response
■ Operating frequency remains constant with load current
and input voltage
■ Maximum Duty Cycle Limited During Start-Up
■ Adjustable output voltage
■ Valley Current Limit At 0.64A
■ Precision internal reference
■ Low bias current
■ Highly efficient operation
■ Thermal shutdown
Typical Applications
■ Automotive Safety and Infotainment
■ High Efficiency Point-Of-Load (POL) Regulator
■ Non-Isolated Telecommunication Buck Regulator
■ Secondary High Voltage Post Regulator
Package
■ micro SMD (2mm x 2mm)
Basic Step Down Regulator
30102731
2010 National Semiconductor Corporation
301027
www.national.com
LM34919B
Ultra
Small
40V,
600
mA
Constant
On-Time
Buck
Switching
Regulator
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM34919BQTLX/NOPB | 功能描述:直流/直流开关调节器 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 |
| LM34919BTL | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator |
| LM34919BTL/NOPB | 功能描述:直流/直流开关调节器 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 |
| LM34919BTLX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator |
| LM34919BTLX/NOPB | 功能描述:直流/直流开关调节器 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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