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LDK320M33R

LDK320M33R

STMicroelectronics
Linear Voltage Regulator IC Positive Fixed 1 Output 200mA SOT-23-5
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Overview

The LDK320M33R is a low-dropout (LDO) linear voltage regulator from STMicroelectronics that delivers 200mA of output current from an input voltage up to 18V. It is designed to provide a stable 3.3V supply with high power supply rejection ratio (PSRR) and very low noise, making it suitable for sensitive analog and digital rails. The device includes an enable pin for power sequencing and integrated protection against over-current and over-temperature conditions.

Why Choose This Part

The LDK320M33R offers a high PSRR (88dB at low frequencies) and low noise (63 nV/sqrt(Hz)), ensuring signal integrity in precision designs. Its low quiescent current of 70uA at full load and 1uA in shutdown helps extend battery life in portable applications. The wide input range from 2.5V to 18V provides significant design flexibility for various power sources.

Applications

Battery-Powered Instrumentation
Ideal for handheld devices requiring a stable 3.3V rail from a varying battery voltage with minimal current draw in shutdown mode.
Analog Signal Conditioning
High PSRR of up to 88dB at 120Hz helps filter ripple from switching regulators to power sensitive op-amps and ADCs.
Post-Regulation
Used after a DC-DC converter to provide a clean, low-noise supply for RF or high-precision circuits.
Industrial Sensor Nodes
The wide 18V input range allows for direct regulation from 12V industrial power buses.

Key Specifications

PSRR 88dB ~ 48dB (120Hz ~ 10kHz)
Output Type Fixed
Mounting Type Surface Mount
Package / Case SC-74A, SOT-753
Control Features Enable
Current - Output 200mA
Protection Features Over Current, Over Temperature
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 125degC (TJ)
Voltage - Input (Max) 18V
Voltage Dropout (Max) 0.35V @ 200mA
Current - Supply (Max) 100 uA
Supplier Device Package SOT-23-5
Current - Quiescent (Iq) 90 uA
Voltage - Output (Min/Fixed) 3.3V

Getting Started

When designing with the LDK320M33R, ensure low-ESR ceramic capacitors are placed close to the input and output pins for stability. Utilize the enable pin for power management to reduce current consumption to 1uA when the regulator is not required. Thermal management should be considered based on the SOT23-5 package's power dissipation limits and the voltage drop across the regulator.

Also Consider

LP5907MFX-3.3/NOPB TITexas Instruments - Choose this for even lower noise and higher PSRR in space-constrained 250mA applications.
MIC5219-3.3YM5-TR MCHPMicrochip Technology - A common alternative for 500mA peak current requirements with low dropout.