The LP3997 regulator is designed to meet the requirements of portable, battery-powered systems, providing accurate output voltage, low noise, and low quiescent current. The LP3997 provides 3.3V output at up to 250mA load current. The chip architecture is capable of providing output voltages as low as 0.8V. When switched in shutdown mode, the power consumption is virtually zero.

The LP3997 is designed to be stable with space saving ceramic output capacitor as small as 1µF.

The LP3997 also includes an out-of-regulation error flag. When the output is more than 5% below its nominal voltage, the error flag sets to low. If a capacitor is connected to device’s delay pin, a delayed power-on reset signal will be generated.

• Low 140-mV Dropout at 250-mA Load
• Stable With Ceramic Capacitor.
• Low Noise With Bypass Capacitor
• Less Than 80 μA Typical IQ at 250 mA
• Virtually Zero IQ (Disabled)
• Thermal and Short Circuit Protection
• 3.3-V Output For other voltage options, contact your TI sales office
• 8-Lead VSSOP Package For other package options, contact your TI sales office.

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• Output options
• Fixed Output
• Iout (Max) (A)
• 0.25
• Vin (Max) (V)
• 6
• Vin (Min) (V)
• 2
• Vout (Max) (V)
• 3.3
• Vout (Min) (V)
• 3.3
• Fixed output options (V)
• 3.3
• Noise (uVrms)
• 100
• Iq (Typ) (mA)
• 0.055
• Thermal resistance θJA (°C/W)
• 210
• Rating
• Catalog
• Load capacitance (Min) (μF)
• 1
• Regulated outputs (#)
• 1
• Features
• Enable, Power good
• Accuracy (%)
• 3
• PSRR @ 100 KHz (dB)
• 35
• Dropout voltage (Vdo) (Typ) (mV)
• 140
• Operating temperature range (C)
• -40 to 125

LP3997的完整型号有：LP3997MM-3.3/NOPB，以下是这些产品的关键参数及官网采购报价：

LP3997MM-3.3/NOPB，工作温度：-40 to 125，封装：VSSOP (DGK)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LP3997MM-3.3/NOPB的批量USD价格：.429（1000+）

LP3997MM-3.3/NOPB，工作温度：-40 to 125，封装：VSSOP (DGK)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LP3997MM-3.3/NOPB的批量USD价格：.429（1000+）