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参数资料
| 型号： | LP2980LV |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | Micropower SOT, 50 mA Low-Voltage Low-Dropout Regulator For Applications With Output Voltages < 2V |
| 中文描述： | 微采用SOT，50毫安低电压低差对于输出电压调节器的应用“2V的 |
| 文件页数： | 14/18页 |
| 文件大小： | 423K |
| 代理商： | LP2980LV |
Typical Applications
The LP2980 can be used to control higher-current regula-
tors, by adding an external PNP pass device. With the PNP
transistors shown in , the output current can be as high as
400 mA, as long as the input voltage is held within the Safe
Operation Boundary Curves shown below in.
To ensure regulation, the minimum input voltage of this regu-
lator is 6V. This “headroom” is the sum of the V
of the ex-
ternal transistor and the dropout voltage of the LP2980.
Notes:
A. 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.
B. Recommended devices (other PNP transistors can be
used if the current gain and voltage ratings are similar).
C. Capacitor is required for regulator stability. Minimum size
is shown, and may be increased without limit.
D. Increasing the output capacitance improves transient re-
sponse and increases phase margin.
E. 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 ther-
mal resistance from junction-to-ambient is 180C/W in still
air.
Assuming a maximum allowable junction temperature of
150C for the MPS2907A device, the following curves show
the maximum V
and I
values that may be safely used for
several ambient temperatures.
With limited input voltage range, the LP2980 can control a
3.3V, 3A regulator with the use of a high current-gain exter-
nal PNP pass transistorias shown in . If the regulator is to be
loaded with the full 3A, heat sinking will be required on the
pass transistor to keep it within its rated temperature range.
Refer to the Heatsink Thermal Resistance Requirements,
below. For best load regulation at the high load current, the
LP2980 output voltage connection should be made as close
to the load as possible.
Although this regulator can handle a much higher load cur-
rent than can the LP2980 alone, it can be shut down in the
same manner as the LP2980. When the ON/OFF control is
DS012078-51
FIGURE 5. 5V/400mA Regulator
DS012078-52
FIGURE 6. Safe Operation Boundary Curves for
Figure
5
DS012078-53
FIGURE 7. 5V to 3.3V
@
3A Converter
L
www.national.com
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相关PDF资料 |
PDF描述 |
|---|---|
| LP2981 | 100-MA ULTRA DROPOUT REGULATOR WITH SHUTDOWN |
| LP2981AIBP-3.2 | Micropower 100 mA Ultra Low-Dropout Regulator |
| LP2981AIBP-3.3 | Micropower 100 mA Ultra Low-Dropout Regulator |
| LP2981AIBPX-2.5 | Micropower 100 mA Ultra Low-Dropout Regulator |
| LP2981AIBPX-3.2 | Micropower 100 mA Ultra Low-Dropout Regulator |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LP2981-2.5BUP6 WAF | 制造商:Texas Instruments 功能描述: |
| LP2981-28DBVR | 功能描述:低压差稳压器 - LDO 100-mA 1.25% Tolerance RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| LP2981-28DBVRE4 | 功能描述:低压差稳压器 - LDO 100-mA 1.25% Tolerance RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| LP2981-28DBVRG4 | 功能描述:低压差稳压器 - LDO Sgl Output 100mA Fixed(2.8V) Shutdown RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| LP2981-28DBVT | 功能描述:低压差稳压器 - LDO 100-mA 1.25% Tolerance RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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