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LP2983AIM5X-1.0/NOPB

150 mA LDO, 1.0 V fixed, 16 V max input, 65 dB PSRR, A-grade, 5-SOT-23

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Manufacturer Part：

LP2983AIM5X-1.0/NOPB

Package：

5-SOT-23-5 (SC-74A)

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Description

Product Overview

The LP2983AIM5X-1.0/NOPB is a 150 mA LDO voltage regulator from Texas Instruments with a fixed 1.0 V output. Packaged in a 5-pin SOT-23-5 (SC-74A), it operates from up to 16 V input and features low quiescent current (95 µA), high PSRR (65 dB at 1 kHz), and an enable pin. The A-grade version offers tighter output voltage tolerance, making it suitable for precision low-voltage rails.

Key Specifications

Output Voltage 1.0 V (Fixed)
Output Current 150 mA
Input Voltage (Max) 16 V
Quiescent Current 95 µA typical
PSRR 65 dB at 1 kHz
Package 5-SOT-23 (SC-74A)
Operating Temperature -40°C to +125°C
Accuracy A-Grade (tighter tolerance)

Features

  • Fixed 1.0 V output for low-voltage core rails
  • A-grade accuracy for precision applications
  • 65 dB PSRR at 1 kHz for noise-sensitive loads
  • 95 µA typical quiescent current
  • Enable pin for on/off control and power sequencing

Applications

  • Low-voltage DSP and microcontroller core supplies
  • Post-regulation for switching power supplies
  • Battery-powered portable devices
  • Memory termination voltage regulation
  • Clock and PLL power supply filtering

The LP2983 is a 150 mA low-dropout regulator from Texas Instruments designed for portable and battery-powered applications. The A-grade version offers tighter output voltage accuracy for precision low-voltage rails. The device features very low quiescent current (95 µA typical) and high PSRR (65 dB at 1 kHz), making it suitable for noise-sensitive loads. The enable pin allows the regulator to be switched off, reducing supply current to near zero. The small SOT-23-5 package minimizes board space in compact designs.

The LP2983 uses a PMOS pass transistor in a feedback-regulated LDO topology. The output voltage is compared against an internal precision bandgap reference by the error amplifier, which drives the PMOS gate to maintain regulation. The high PSRR is achieved through the high loop gain of the error amplifier and the PMOS pass device characteristics. The enable pin controls the regulator output: when EN is low, the pass transistor is turned off and the output is discharged. Over-current and over-temperature protection circuits ensure safe operation under fault conditions.

Pin Name Type Function
1 VIN Input Input supply voltage (up to 16 V)
2 GND Power Ground reference
3 EN Input Enable control (high = on)
4 NC — No connect
5 VOUT Output Regulated 1.0 V output
  • 1.0 V core rail for low-voltage microcontrollers and DSPs
  • Post-regulation of switching supply output for noise reduction
  • PLL and clock generator clean power supply
  • Memory VTT termination voltage
  • Portable medical device low-voltage regulation
Manufacturer Part Number Package Notes
TI LP2983IM5X-1.0/NOPB 5-SOT-23 Standard grade, same function
TI TLV70010DDCR 5-SOT-23 200 mA, 1.0 V, lower Iq
Microchip MCP1824T-1002E/TT 5-SOT-23 300 mA, 1.0 V
onsemi NCP511SN10T1G 5-TSOP-5 80 mA, 1.0 V LDO
Diodes Inc AP7311-10WG-7 5-SOT-25 150 mA, 1.0 V LDO
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Contact Information

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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