LM7705 Texas instruments

LM7705

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LM7705

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Описание

The LM7705 device is a switched capacitor voltage inverter with a low noise, −0.23 V fixed negative voltage regulator. This device is designed to be used with low voltage amplifiers to enable the amplifiers output to swing to zero volts. The −0.23 V is used to supply the negative supply pin of an amplifier while maintaining less then 5.5 V across the amplifier. Rail-to-Rail output amplifiers cannot output zero volts when operating from a single-supply voltage and can result in error accumulation due to amplifier output saturation voltage being amplified by following gain stages. A small negative supply voltage will prevent the amplifiers output from saturating at zero volts and will help maintain an accurate zero through a signal processing chain. Additionally, when an amplifier is used to drive an input of the ADC, the amplifier can output a zero voltage signal and the full input range of an ADC can be used. The LM7705 device has a shutdown pin to minimize standby power consumption.

Regulated Output Voltage −0.232 V
Output Voltage Tolerance 5%
Output Voltage Ripple 4 mV_PP
Supply Voltage 3 V to 5.25 V
Conversion Efficiency Up to 98%
Quiescent Current 78 µA
Shutdown Current 20 nA
Turnon Time 500 µs
Operating Temperature Range −40°C to 125°C
8-Pin VSSOP Package

Vin (min) (V)	3
Vin (max) (V)	5.25
Vout (min) (V)	-0.232
Vout (max) (V)	-0.232
Iout (max) (A)	0.026
Regulated outputs (#)	1
Switching frequency (min) (kHz)	92
Switching frequency (max) (kHz)	92
Iq (typ) (mA)	0.078
Features	Enable, Synchronous Rectification
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Type	Charge pump, Converter