LD2980CM18TR

Low-dropout regulator, fixed 1.8V, 100mA, 150mV dropout, SOT23-5L

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Manufacturer Part：

LD2980CM18TR

Package：

SOT23-5L (2.9 x 2.8 x 1.3 mm)

Brand：

Product Categories：

DC-DC Converters, Integrated Circuits ICs

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Description

Product Overview

The LD2980CM18TR from STMicroelectronics is a very low drop voltage regulator with a fixed 1.8V output, capable of supplying up to 100 mA output current. The device features an ultra-low dropout of 150 mV (typical at full load) and a quiescent current of just 1.2 mA. It is housed in a compact SOT23-5L package and includes short-circuit and thermal protection.

Key Specifications

Output Voltage	1.8V (fixed)
Maximum Output Current	100 mA
Dropout Voltage	150 mV (typical at 100 mA)
Quiescent Current	1.2 mA (typical)
Input Voltage Range	2.0V to 16V
Operating Temperature	-40°C to +125°C
Package	SOT23-5L
Packing	Tape & Reel
Line Regulation	0.01%/V (typical)
Load Regulation	0.002%/mA (typical)

Features

Ultra-low dropout voltage: 150 mV at 100 mA
Fixed 1.8V output with ±2% accuracy
Very low quiescent current: 1.2 mA
Internal short-circuit current limiting
Thermal shutdown protection
Compatible with low ESR ceramic output capacitors
Available in SOT23-5L miniature package
No bypass capacitor required

Applications

Battery-powered portable devices
Post-regulation in switching power supplies
Mobile phone and PDA power management
Wireless communication modules
Low-noise analog circuit supply
IoT sensor node power

Product Introduction:LD2980CM18TR Product Introduction

The LD2980CM18TR is a very low dropout voltage regulator from STMicroelectronics, providing a fixed 1.8V output at up to 100 mA. With a typical dropout voltage of only 150 mV at full load, the device is ideal for battery-powered applications where maximizing battery life is critical. The regulator accepts input voltages from 2.0V to 16V and features a low quiescent current of 1.2 mA. The LD2980 family is available in multiple fixed output voltage options and uses a standard SOT23-5L package. The CM18TR suffix indicates the 1.8V output version in tape and reel packaging. The device includes built-in short-circuit current limiting and thermal shutdown protection for reliable operation under fault conditions. It is compatible with low ESR ceramic output capacitors, simplifying PCB design and reducing component count.

Working Principle:LD2980CM18TR Working Principle

The LD2980 operates through three key subsystems:

1. Voltage Reference and Error Amplifier: An internal bandgap voltage reference generates a stable 1.23V reference. A transconductance error amplifier compares the divided output voltage (via internal resistor divider for fixed versions) with the reference and adjusts the pass transistor drive to maintain regulation.

2. Pass Element: A PNP bipolar pass transistor provides the low dropout characteristic. Unlike NPN-based LDOs, the PNP configuration allows the input-to-output voltage differential to be as low as the saturation voltage of the transistor (150 mV typical), enabling operation from input voltages very close to the output.

3. Protection Circuits: An internal current limit circuit protects against output short circuits by limiting the pass transistor drive current. A thermal shutdown circuit disables the regulator when the junction temperature exceeds approximately 150°C, re-enabling it once the temperature drops below the hysteresis threshold. The device is stable with ceramic output capacitors of 2.2 µF or greater.

Pin Description:LD2980CM18TR Pin Definition and Functions

Pin	Name	Type	Function
1	IN	Power	Input voltage (2.0–16V)
2	GND	Power	Ground
3	EN	Input	Enable (active high; tie to IN if unused)
4	BYP	I/O	Bypass capacitor for noise reduction (optional; leave open if unused)
5	OUT	Power	Regulated 1.8V output

Application Scenarios:In which products and applications isLD2980CM18TR used

Battery-powered devices: 150 mV dropout enables operation from a single Li-ion cell (3.0V end-of-life) down to 1.8V output with 100 mA load capability
Post-regulation in switchers: Low quiescent current (1.2 mA) and low noise make it ideal as a secondary regulator after a switching converter for noise-sensitive analog circuits
Portable electronics: SOT23-5L package minimizes PCB footprint in mobile phones, PDAs, and wearable devices requiring 1.8V logic supply
IoT sensor nodes: Enable pin allows microcontroller-controlled power gating for battery conservation in duty-cycled wireless sensor applications

Alternative Models:What chips are recommended as replacements for LD2980CM18TR

Manufacturer	Part Number	Package	Notes
STMicroelectronics	LD2980CM33TR	SOT23-5L	3.3V output version
STMicroelectronics	LD2980CM25TR	SOT23-5L	2.5V output version
Texas Instruments	TLV70018DQNT	X2SON-4	1.8V, 200mA, smaller package
onsemi	NCP511SN18T1G	TSOP-5	1.8V, 80mA, low noise
Microchip	MCP1824S-1802E/DB	SOT223-3	1.8V, 300mA, higher current
Richtek	RT9193-18GB	SOT23-5	1.8V, 300mA, low noise