The LP2957 is a 5V micropower voltage regulator with electronic shutdown, error flag, very low quiescent current (150 µA typical at 1 mA load), and very low dropout voltage (470 mV typical at 250 mA load current).

Output can be wired for snap-on/snap-off operation to eliminate transition voltage states where µP operation may be unpredictable.

Output crowbar (50 mA typical pull-down current) will bring down the output quickly when the regulator snaps off or when the shutdown function is activated.

The part has tight line and load regulation (0.04% typical) and low output temperature coefficient (20 ppm/°C typical).

The accuracy of the 5V output is ensured at room temperature and over the full operating temperature range.

The LP2957 is available in the five-lead TO-220 and DDPAK/TO-263 packages.

• 5V Output within 1.4% Over Temperature (A Grade)
• Easily Programmed for Snap-On/Snap-Off Output
• Ensured 250mA Output Current
• Extremely Low Quiescent Current
• Low Input-Output Voltage Required for Regulation
• Reverse Battery Protection
• Extremely Tight Line and Load Regulation
• Very Low Temperature Coefficient
• Current and Thermal Limiting
• Error Flag Signals when Output is out of Regulation

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• Output options
• Fixed Output
• Iout (Max) (A)
• 0.25
• Vin (Max) (V)
• 30
• Vin (Min) (V)
• -20
• Vout (Max) (V)
• 5
• Vout (Min) (V)
• 5
• Fixed output options (V)
• 5
• Noise (uVrms)
• 320
• Iq (Typ) (mA)
• 0.15
• Thermal resistance θJA (°C/W)
• 60
• Rating
• Catalog
• Load capacitance (Min) (F)
• 2.2
• Regulated outputs (#)
• 1
• Features
• Enable, Power good
• Accuracy (%)
• 3
• PSRR @ 100 KHz (dB)
• 14
• Dropout voltage (Vdo) (Typ) (mV)
• 470
• Operating temperature range (C)
• -40 to 125

LP2957A的完整型号有：LP2957AISX/NOPB、LP2957AIT/NOPB，以下是这些产品的关键参数及官网采购报价：

LP2957AISX/NOPB，工作温度：-40 to 125，封装：DDPAK/TO-263 (KTT)-5，包装数量MPQ：500个，MSL 等级/回流焊峰值温度：Level-3-245C-168 HR，引脚镀层/焊球材料：SN，TI官网LP2957AISX/NOPB的批量USD价格：1.583（1000+）

LP2957AIT/NOPB，工作温度：-40 to 125，封装：TO-220 (NDH)-5，包装数量MPQ：45个，MSL 等级/回流焊峰值温度：Level-1-NA-UNLIM，引脚镀层/焊球材料：SN，TI官网LP2957AIT/NOPB的批量USD价格：1.583（1000+）