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参数资料
| 型号： | LM34919BTL |
| 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： | 14/20页 |
| 文件大小： | 488K |
| 代理商： | LM34919BTL |
Pin Descriptions
Pin Number
Name
Description
Application Information
A1
RON/SD
On-time control and shutdown
An external resistor from VIN to this pin sets the buck switch
on-time. Grounding this pin shuts down the regulator.
A2
RTN
Circuit Ground
Ground for all internal circuitry other than the current limit
detection.
A3
FB
Feedback input from the regulated
output
Internally connected to the regulation and over-voltage
comparators. The regulation level is 2.5V.
B1
SGND
Sense Ground
Re-circulating current flows into this pin to the current sense
resistor.
B3
SS
Softstart
An internal current source charges an external capacitor to
2.5V, providing the softstart function.
C1
ISEN
Current sense
The re-circulating current flows through the internal sense
resistor, and out of this pin to the free-wheeling diode.
Current limit is nominally set at 0.64A.
C3
VCC
Output from the startup regulator
Nominally regulated at 7.0V. An external voltage (7V-14V)
can be applied to this pin to reduce internal dissipation. An
internal diode connects VCC to VIN.
D1
VIN
Input supply voltage
Nominal input range is 6.0V to 40V.
D2
SW
Switching Node
Internally connected to the buck switch source. Connect to
the inductor, free-wheeling diode, and bootstrap capacitor.
D3
BST
Boost pin for bootstrap capacitor
Connect a 0.022 F capacitor from SW to this pin. The
capacitor is charged from V
CC via an internal diode during
each off-time.
3
www.national.com
LM34919B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LM34919C-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LM34919C-Q1 Ultra Small 50V, 600 mA Constant On-Time Buck Switching Regulator |
| LM34919CQSD/NOPB | 制造商:Texas Instruments 功能描述:IC REG BUCK ADJ 0.6A 12WSON |
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