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LP38693SD-3.3

500mA LDO, 3.3V fixed, 10V max input, 250mV VDO, WSON-6, AEC-Q100, enable pin

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Manufacturer Part：

LP38693SD-3.3

Package：

WSON-6 (3.00 x 3.00 x 0.90 mm, exposed pad)

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Description

Product Overview

The LP38693SD-3.3 from Texas Instruments is a 500mA low-dropout CMOS linear regulator with 3.3V fixed output in a WSON-6 package. With 250mV dropout at 500mA and 55uA ground current, it provides efficient regulation for portable and automotive applications.

Key Specifications

Output Voltage 3.3 V (fixed)
Output Current 500 mA
Input Voltage 2.7 V to 10 V
Dropout Voltage 250 mV (typ at 500mA, VOUT=5V)
Ground Current 55 uA (typ at full load)
PSRR 50 dB at 100kHz
Operating Temperature -40C to +125C

Features

  • 2.7V-10V wide input range with 3.3V fixed output
  • 250mV low dropout voltage at 500mA for efficient regulation
  • 55uA typical ground current independent of load
  • 50dB PSRR at 100kHz for noise-sensitive circuits
  • Enable pin with 1uA off-state quiescent current
  • AEC-Q100 Grade 1 qualified (WSON options) for automotive

Applications

  • Automotive ECU and infotainment power supply
  • Hard disk drive and laptop voltage regulation
  • Battery-powered portable instruments
  • Post-regulation after DC-DC converters

The LP38693SD-3.3 from Texas Instruments is a 500mA low-dropout CMOS linear regulator with a fixed 3.3V output in a WSON-6 package with exposed thermal pad. The device accepts input voltages from 2.7V to 10V, providing flexible supply options from single-cell Li-Ion to 9V battery systems. The PMOS pass transistor provides 250mV typical dropout voltage at 500mA load (for 5V output variant), ensuring efficient regulation with minimal headroom. The CMOS design maintains ground pin current below 100uA regardless of load current, input voltage, or operating temperature, significantly improving efficiency compared to bipolar LDOs at light loads. The 50dB PSRR at 100kHz rejects input power supply noise, making the device suitable for post-regulation of switching converters. The enable pin allows power sequencing and reduces quiescent current to 1uA when disabled. The WSON-6 package with exposed thermal pad provides low thermal resistance (51C/W), enabling full 500mA output even in high ambient temperatures. AEC-Q100 Grade 1 qualification (WSON options) supports automotive applications.

The LP38693SD-3.3 uses a PMOS pass transistor for low-dropout regulation. (1) PMOS Pass Element: Unlike NPN or NMOS regulators that require VOUT + VBE or VOUT + VGS headroom, the PMOS pass transistor requires only a small VDS for regulation, enabling the 250mV dropout voltage. The gate of the PMOS is driven by the error amplifier to regulate output voltage. (2) Error Amplifier: A precision trimmed bandgap reference provides a stable reference voltage. The error amplifier compares a divided version of the output voltage to the reference and adjusts the PMOS gate drive to maintain regulation. The 2% output accuracy at 25C reflects the bandgap trimming precision. (3) Ground Current: The PMOS gate is voltage-driven, requiring negligible DC gate current. The 55uA ground current consists of the bandgap reference, error amplifier, and bias circuit supply current, independent of load. (4) Foldback Current Limit: Under overload conditions, the current limit circuit reduces the output current as the output voltage decreases (foldback), limiting power dissipation. (5) Thermal Shutdown: When the junction temperature exceeds approximately 165C, the thermal shutdown circuit turns off the pass transistor, protecting the device from damage.

Pin Name Type Function
1 EN Input Enable (active high)
2 GND Ground Ground (exposed pad)
3 IN Power Input supply (2.7-10V)
4 OUT Output Regulated 3.3V output
5-6 GND/NC – Ground / Not connected
  • Automotive ECU and infotainment 3.3V power supply at AEC-Q100 Grade 1
  • Hard disk drive and laptop voltage regulation from 5V input
  • Battery-powered portable instruments with 55uA ground current
  • Post-regulation after DC-DC converters with 50dB PSRR at 100kHz
Manufacturer Part Number Package Notes
TI TLV76733SDR WSON-6 1A, 16V, higher current
TI LP38692SD-3.3 WSON-6 Without enable pin
Microchip MIC5219-3.3YM5-TR SOT-23-5 500mA, 3.3V, smaller
Infineon TLE4274GV33 TO-252-3 200mA, automotive
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