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| 型号： | LP2980AITP-3.3/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V 50MA 5USMD |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 16V |
| 电压 - 压降（标准）： | 0.12V @ 50mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 50mA |
| 电流 - 限制（最小）： | 100mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 5-VFBGA |
| 供应商设备封装： | 5-uSMD |
| 包装： | 剪切带 (CT) |
| 其它名称： | *LP2980AITP-3.3 *LP2980AITP-3.3/NOPB LP2980AITP-3.3CT |
SNOS733M – APRIL 2000 – REVISED JUNE 2013
Increasing Output Current
Figure 39. 5V/400mA Regulator
The LP2980-N can be used to control higher-current regulators, by adding an external PNP pass device. With
the PNP transistors shown in Figure 39 , the output current can be as high as 400 mA, as long as the input
To ensure regulation, the minimum input voltage of this regulator is 6V. This “headroom” is the sum of the V BE of
the external transistor and the dropout voltage of the LP2980-N.
Notes:
1. Drive this input with a logic signal (see APPLICATION HINTS ). If the shutdown function is not to be used, tie
the ON/OFF pin directly to the V IN pin.
2. Recommended devices (other PNP transistors can be used if the current gain and voltage ratings are
similar).
3. Capacitor is required for regulator stability. Minimum size is shown, and may be increased without limit.
4. Increasing the output capacitance improves transient response and increases phase margin.
5. Maximum safe input voltage and load current are limited by power dissipation in the PNP pass transistor and
the maximum ambient temperature for the specific application. If a TO-92 transistor such as the MPS2907A
is used, the thermal resistance from junction-to-ambient is 180°C/W in still air.
Assuming a maximum allowable junction temperature of 150°C for the MPS2907A device, the following curves
show the maximum V IN and I L values that may be safely used for several ambient temperatures.
Copyright ? 2000–2013, Texas Instruments Incorporated
Product Folder Links: LP2980-N
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