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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Analog Devices Inc./Maxim Integrated MAX8873REUK

Name: MAX8873REUK
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX8873REUK
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX8873REUK

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: SC-74A, SOT-753

Datasheet:: MAX8873REUK.pdf

Description:: LOW-DROPOUT, 120MILLI AMP LINEAR

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX8873REUK from Maxim Integrated is a low-dropout linear regulator with fixed 2.80V output, delivering up to 120mA from a +2.5V to +6.5V input. It features 82µA operating supply current independent of load, 55mV dropout at 50mA, and Dual Mode™ operation (fixed or adjustable via SET pin). It is designed for battery-powered portable equipment including cellular phones and cordless telephones.

For engineers reviewing the MAX8873REUK datasheet, MAX8873REUK pinout, MAX8873REUK application, or MAX8873REUK equivalent, key selection criteria include its SOT23-5 package, reverse battery protection, thermal shutdown at +170°C, ±3.5% total output error, and compatibility with 1µF input/output capacitors for stable operation across -40°C to +85°C.

Technical Context

The MAX8873REUK employs a P-channel MOSFET pass transistor with 1.1Ω typical R_DS(ON), enabling ultra-low quiescent current in dropout and eliminating base-drive losses. Its internal 1.25V bandgap reference feeds an error amplifier that controls gate drive to maintain regulation.

Dual Mode™ operation is determined by the voltage on the SET pin: ≤60mV selects internal feedback for fixed 2.80V output; connection to an external resistor divider enables adjustable output from 1.25V to 6.5V. Shutdown logic disables all circuitry except SHDN bias, reducing supply current to 0.1nA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.80V (±3.5% total error over temp/load)
Max Output Current	120mA continuous; current limit 280mA typical (safe short-circuit operation)
Dropout Voltage	55mV at 50mA; 130mV at 120mA - enables operation near battery end-of-life
Quiescent Current	82µA operating (load-independent); 0.1nA in shutdown - extends battery life
Input Voltage Range	+2.5V to +6.5V - compatible with single Li-ion, NiMH, and alkaline stacks
Thermal Shutdown	Activates at +170°C with 20°C hysteresis - prevents permanent damage during overload
Reverse Battery Protection	Limits reverse current to <1mA when VIN or SHDN < GND - protects battery and IC

Pinout & Package

MAX8873REUK is housed in a RoHS-compliant 5-pin SOT23 package (JEDEC MO-178AA), with GND serving as both electrical ground and thermal heatsink. PCB layout must use large copper area under GND for thermal dissipation.

Pin/Terminal	Circuit Role	Design Meaning
1 IN	Regulator input	Accepts +2.5V to +6.5V; bypass with 1µF capacitor to GND for stability and noise rejection
2 GND	Ground / thermal pad	Electrical return path and primary heat conduction path; must connect to large PCB ground plane
3 SHDN	Active-low shutdown control	Logic low disables regulator and reduces I_Q to 0.1nA; tied to IN for normal operation
4 SET	Feedback mode selector	≤60mV selects fixed 2.80V output; external resistor divider enables 1.25V–6.5V adjustment
5 OUT	Regulated output	Delivers up to 120mA; requires 1µF capacitor (ESR < 0.2Ω) to GND for stability across temperature/load

Key Features

Feature	Design Value
Dual Mode™ operation	Fixed 2.80V output or adjustable 1.25V–6.5V via external resistors - eliminates need for multiple SKUs
P-channel MOSFET pass element	1.1Ω R_DS(ON) enables 55mV dropout at 50mA and zero base-drive current - maximizes battery runtime
Reverse battery protection	Blocks reverse current <1mA when VIN or SHDN falls below GND - prevents battery drain and thermal runaway
Thermal shutdown with hysteresis	+170°C trip with +20°C hysteresis - enables self-recovery during intermittent overload without system reset
Low-noise, stable output	350µV_RMS noise (10Hz–1MHz); stable with 1µF ceramic output cap - suitable for analog/RF subsystems

Applications

Cellular Telephones	Cordless Telephones
Use Scenario: Powering RF front-end and baseband ICs in compact handheld handsets with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary LDO supplying 2.80V to voltage-sensitive analog circuits and microcontrollers. Use Value: 55mV dropout extends usable battery range down to 2.855V; 82µA quiescent current minimizes standby drain.	Use Scenario: Regulating power for digital signal processor (DSP) and codec in DECT 6.0 cordless handsets. IC Role / Device Role / Timing Role: Fixed-output LDO delivering clean 2.80V rail with minimal board space and BOM count. Use Value: Reverse battery protection prevents damage during battery swap; SOT23-5 footprint fits tight handset layouts.
Hand-Held Instruments	PCMCIA Cards
Use Scenario: Supplying precision ADCs and op-amps in portable multimeters and data loggers powered by AA/AAA cells. IC Role / Device Role / Timing Role: Low-noise, thermally robust regulator ensuring measurement accuracy across temperature extremes. Use Value: ±3.5% output tolerance and 350µV_RMS noise meet 12-bit ADC PSRR requirements; thermal hysteresis avoids lockup during field use.	Use Scenario: Providing regulated 2.80V to memory and interface logic in hot-pluggable PCMCIA Type II cards. IC Role / Device Role / Timing Role: Input-tolerant LDO with fast transient response and reverse polarity immunity for plug-in modules. Use Value: 120mA capability supports burst-mode memory access; 0.1nA shutdown current prevents card battery leakage during host sleep.

Cellular Telephones

Cordless Telephones

Use Scenario: Powering RF front-end and baseband ICs in compact handheld handsets with single-cell Li-ion battery.

IC Role / Device Role / Timing Role: Primary LDO supplying 2.80V to voltage-sensitive analog circuits and microcontrollers.

Use Value: 55mV dropout extends usable battery range down to 2.855V; 82µA quiescent current minimizes standby drain.

Use Scenario: Regulating power for digital signal processor (DSP) and codec in DECT 6.0 cordless handsets.

IC Role / Device Role / Timing Role: Fixed-output LDO delivering clean 2.80V rail with minimal board space and BOM count.

Use Value: Reverse battery protection prevents damage during battery swap; SOT23-5 footprint fits tight handset layouts.

Hand-Held Instruments

PCMCIA Cards

Use Scenario: Supplying precision ADCs and op-amps in portable multimeters and data loggers powered by AA/AAA cells.

IC Role / Device Role / Timing Role: Low-noise, thermally robust regulator ensuring measurement accuracy across temperature extremes.

Use Value: ±3.5% output tolerance and 350µV_RMS noise meet 12-bit ADC PSRR requirements; thermal hysteresis avoids lockup during field use.

Use Scenario: Providing regulated 2.80V to memory and interface logic in hot-pluggable PCMCIA Type II cards.

IC Role / Device Role / Timing Role: Input-tolerant LDO with fast transient response and reverse polarity immunity for plug-in modules.

Use Value: 120mA capability supports burst-mode memory access; 0.1nA shutdown current prevents card battery leakage during host sleep.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LP2980AIM5-2.8	Pin-compatible SOT23-5; fixed 2.8V output; 60µA I_Q; 100mV dropout at 100mA; no reverse battery protection	Lacks reverse battery and thermal hysteresis features; lower max current (50mA)	Select when ultra-low I_Q is critical and reverse polarity risk is absent
TPS76328DBVR	SOT23-5; fixed 2.8V; 80µA I_Q; 250mV dropout at 100mA; includes enable but no reverse protection	Higher dropout limits usable input range; no reverse battery or dual-mode adjustability	Select for TI ecosystem designs where higher dropout is acceptable and enable functionality is required

Compared with LP2980AIM5-2.8 and TPS76328DBVR, the MAX8873REUK provides superior dropout performance (55mV vs. ≥100mV), integrated reverse battery protection, and Dual Mode™ flexibility - making it optimal for space-constrained, battery-critical portable systems requiring robustness and extended runtime.

Availability

MAX8873REUK is available at Aetrix Electronics and suitable for cellular telephones, cordless telephones, and hand-held instruments requiring stable component supply, long-term lifecycle support, and automotive-grade traceability (as indicated by /V+T suffix).

Supply support for MAX8873REUK includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX8873 series belongs to Maxim's low-quiescent-current LDO family, engineered specifically for battery-powered portable electronics where minimal dropout, reverse polarity resilience, and thermal robustness are mandatory design requirements.

FAQ

What is the output voltage tolerance of the MAX8873REUK over temperature and load?

The MAX8873REUK has a total output voltage error of ±3.5% across the full operating range of -40°C to +85°C and 0mA to 120mA load. This includes initial accuracy, line regulation, load regulation, and temperature drift - verified per Maxim's SQC testing methodology and guaranteed in production.

Does the MAX8873REUK require external components for basic operation?

Yes, the MAX8873REUK requires two 1µF ceramic capacitors: one between IN and GND, and one between OUT and GND. These are mandatory for stability, transient response, and noise suppression. The SET pin must be connected to GND for fixed 2.80V operation; leaving it floating is prohibited.

Can the MAX8873REUK be used with input voltages above 5.5V?

Yes, but only with a minimum load current of 20µA in fixed-output mode. Below this threshold, regulation may be lost. When using external feedback resistors, the combined current through the divider and load must exceed 30µA to ensure proper SET pin biasing and regulation.

How does the MAX8873REUK handle reverse battery connection?

The MAX8873REUK actively blocks reverse current to less than 1mA when either IN or SHDN falls below GND. Internal circuitry disconnects parasitic paths and isolates the die, preventing battery discharge, overheating, and potential damage - a key differentiator versus standard LDOs.

Is the MAX8873REUK pin-compatible with other regulators in the same package?

The MAX8873REUK shares the SOT23-5 pinout with the LP2980 series and is explicitly noted as LP2980 pin-compatible in Maxim's documentation. However, functional differences - such as reverse battery protection, thermal hysteresis, and Dual Mode™ - mean direct substitution requires validation of system-level behavior beyond pin mapping.

MAX8873REUK Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Bulk

Product Status:: Active

Output Configuration:: Positive

Output Type:: Adjustable (Fixed)

Number of Regulators:: 1

Voltage - Input (Max):: 6.5V

Voltage - Output (Min/Fixed):: 1.25V (2.8V)

Voltage - Output (Max):: 6.5V

Voltage Dropout (Max):: 0.12V @ 50mA

Current - Output:: 120mA

Current - Quiescent (Iq):: 150 µA

Current - Supply (Max):: -

PSRR:: -

Control Features:: Current Limit, Enable

Protection Features:: Over Current, Over Temperature, Reverse Polarity, Short Circuit

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

MAX8873REUK FAQ

1.How can I place an order for MAX8873REUK through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX8873REUK on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MAX8873REUK reliable?

The price and inventory of MAX8873REUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8873REUK is usually 5 days.

3.What payment methods are accepted for MAX8873REUK?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8873REUK transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX8873REUK?

MAX8873REUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX8873REUK order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MAX8873REUK?

For technical support, including MAX8873REUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8873REUK requirements.

6.How does Aetrix verify that MAX8873REUK is sourced from the original manufacturer or authorized distributors?

All MAX8873REUK products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX8873REUK meets industry standards.

7.What is the process for return or replacement of MAX8873REUK?

All MAX8873REUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX8873REUK, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MAX8873REUK part is unused and in its original packaging.

Return procedure for MAX8873REUK:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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