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Analog Devices Inc./Maxim Integrated MAX8873TEUK+
- Part No.:
- MAX8873TEUK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8873TEUK+.pdf
- Description:
- IC REG LIN POS ADJ 120MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,367
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Product details
Overview
MAX8873TEUK+ from Maxim Integrated is a low-dropout linear regulator with fixed 3.15V output, delivering up to 120mA from a +2.5V to +6.5V input. It features 55mV dropout at 50mA, 82µA operating supply current independent of load, ±3.5% total output error, and reverse battery protection. Designed for portable battery-powered systems like cellular phones and cordless telephones.
For engineers reviewing the MAX8873TEUK+ datasheet, MAX8873TEUK+ pinout, MAX8873TEUK+ application, or MAX8873TEUK+ equivalent, this page provides verified technical context, validated pin functions, confirmed dual-mode operation (fixed/adjustable), thermal shutdown behavior at +170°C, and real-world stability requirements with 1µF input/output capacitors.
Technical Context
The MAX8873TEUK+ uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current across all operating conditions-including dropout-without base-drive losses. Its Dual Mode™ architecture selects between preset 3.15V regulation (SET tied to GND) or adjustable output (1.25V–6.5V) via external resistor divider on the SET pin.
Shutdown logic disables the pass transistor, reference, and bias circuitry, reducing supply current to 0.1nA; the MAX8874 variant adds active output discharge, but MAX8873TEUK+ does not. Thermal protection activates at +170°C junction temperature with +20°C hysteresis, and current limiting holds output current between 120mA and 420mA under fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.15V (±3.5% total error over temp/load) |
| Max Output Current | 120mA continuous; current limit 120–420mA (design margin) |
| 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 |
| Input Voltage Range | +2.5V to +6.5V - compatible with single Li-ion, NiMH, and alkaline stacks |
| Thermal Shutdown | Activates at +170°C junction temperature with +20°C hysteresis |
| Reverse Battery Protection | Limits reverse supply current to <1mA when VIN or SHDN falls below GND |
Pinout & Package
MAX8873TEUK+ is housed in a RoHS-compliant 5-pin SOT23 package (JEDEC MO-178AA), with GND serving as both electrical return and thermal heatsink. Board layout requires soldering GND to a large copper area or ground plane for effective thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Regulator input supply | Accepts +2.5V to +6.5V; bypass with ≥1µF capacitor to GND for stability |
| 2 - GND | Ground reference and thermal path | Must connect to large PCB copper area or ground plane to maintain TJ ≤ +150°C |
| 3 - SHDN | Active-low shutdown control | Logic low disables regulator and reduces IQ to 0.1nA; tie to IN for normal operation |
| 4 - SET | Feedback mode selection input | Tie to GND for fixed 3.15V output; leave unconnected or float - causes malfunction |
| 5 - OUT | Regulated output | Supplies up to 120mA; bypass with ≥1µF, <0.2Ω ESR capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ operation | Fixed 3.15V output (SET = GND) or adjustable 1.25V–6.5V (external resistor divider on SET) |
| P-channel MOSFET pass element | Eliminates base-drive current loss - ensures 82µA IQ remains constant across load and dropout |
| Reverse battery protection | Prevents >1mA reverse current during battery reversal - protects battery and board from overheating |
| Thermal overload protection | Shuts down at +170°C junction temperature; auto-restarts after ~20°C cooldown - prevents permanent damage |
| Low-noise stability envelope | Stable with 1µF output capacitor (ESR <0.2Ω); supports full 120mA load across –40°C to +85°C |
Applications
| Cellular Telephones | Cordless Telephones |
|---|---|
|
Use Scenario: Powering RF front-end ICs and baseband processors in compact handsets with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary LDO supplying stable 3.15V rail to sensitive analog sections while minimizing standby drain. Use Value: 82µA quiescent current extends standby time; 55mV dropout preserves usable battery voltage down to 3.205V. |
Use Scenario: Regulating power for digital signal processors and audio codecs in DECT handsets operating from 2×AA alkaline cells. IC Role / Device Role / Timing Role: Fixed-output LDO delivering clean 3.15V to noise-sensitive audio paths without requiring external feedback components. Use Value: ±3.5% output accuracy ensures consistent codec performance; reverse battery protection guards against user-insertion errors. |
| PCMCIA Cards | Hand-Held Instruments |
|
Use Scenario: Providing isolated 3.15V supply to PCMCIA memory or modem cards inserted into laptops with variable bus voltage. IC Role / Device Role / Timing Role: Input-voltage-flexible LDO accepting 2.5V–6.5V input while maintaining tight regulation despite host bus transients. Use Value: 62dB PSRR at low frequencies suppresses host-switching noise; thermal shutdown prevents latch-up during hot-plug events. |
Use Scenario: Powering microcontroller peripherals and precision ADCs in portable multimeters and data loggers using AA/AAA batteries. IC Role / Device Role / Timing Role: Low-drift, low-noise LDO ensuring stable reference voltage for 12-bit+ ADC conversions during battery discharge. Use Value: 350µVRMS output noise avoids quantization errors; 1.1Ω pass FET minimizes voltage drop across battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout, fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2980AIM5-3.15/NOPB | Pin-compatible SOT23-5; 3.15V fixed; 100mA max; 60mV dropout at 50mA; 95µA IQ | Lower max current and higher quiescent current - less suitable for 120mA burst loads or ultra-long standby | Select if footprint compatibility is mandatory and 100mA load ceiling is acceptable |
| TPS76331DBVR | SOT23-5; 3.1V fixed; 150mA max; 130mV dropout at 150mA; 80µA IQ; no reverse battery protection | Higher dropout and missing reverse polarity protection - requires external diode for battery-reversal safety | Select for higher current headroom where reverse battery risk is mitigated externally |
Compared with MAX8873TEUK+, LP2980AIM5-3.15/NOPB offers identical pinout but sacrifices 20mA current capacity and adds 13µA quiescent overhead, while TPS76331DBVR trades reverse battery protection for +30mA output headroom - making MAX8873TEUK+ optimal for space-constrained, battery-reversal-prone portable designs needing precise 3.15V at 120mA.
Availability
MAX8873TEUK+ is available at Aetrix Electronics and suitable for cellular telephones, cordless telephones, and handheld instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8873TEUK+ 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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and portable applications.
The MAX8873 series belongs to Maxim's ultra-low-quiescent-current LDO family, engineered specifically for battery-powered portable equipment where extended runtime and robust fault protection are critical design requirements.
FAQ
What is the fixed output voltage of the MAX8873TEUK+?
The MAX8873TEUK+ delivers a factory-trimmed fixed output voltage of 3.15V with ±3.5% total error over temperature, line, and load. This value is set by internal feedback resistors and activated when the SET pin is connected to GND. The 3.15V level is optimized for low-power RF and baseband circuits in cellular and cordless telephony applications.
Does the MAX8873TEUK+ support adjustable output voltage?
Yes, the MAX8873TEUK+ supports adjustable output via its SET pin. When the SET pin is connected to an external resistor divider (not tied to GND), the device operates in adjustable mode with output range 1.25V to 6.5V, calculated as VOUT = 1.25V × (1 + R1/R2). However, the "T" suffix denotes factory configuration for 3.15V fixed output - adjustment requires redesigning the feedback network.
What is the dropout voltage specification for MAX8873TEUK+ at full load?
The MAX8873TEUK+ exhibits a dropout voltage of 130mV at 120mA output current, defined as (VIN − VOUT) when VOUT drops 100mV below its nominal value. At 50mA, dropout is 55mV. This low dropout enables operation down to VIN = 3.28V while sustaining 3.15V output - critical for maximizing usable battery voltage in single-cell systems.
How does the MAX8873TEUK+ handle reverse battery connection?
The MAX8873TEUK+ incorporates integrated reverse battery protection that limits reverse current to less than 1mA when either the IN or SHDN pin falls below GND potential. This is achieved by disconnecting internal circuitry and parasitic paths - preventing battery drain, IC overheating, and potential damage to downstream components without requiring external diodes.
What thermal protection features are built into the MAX8873TEUK+?
The MAX8873TEUK+ includes thermal shutdown that activates at +170°C junction temperature, disabling the pass transistor until the die cools by approximately +20°C. This hysteresis prevents oscillation during sustained overload. The device is rated for continuous operation up to +150°C junction temperature, and proper GND pad thermal coupling is required to maintain safe operation at full 120mA load.
MAX8873TEUK+ 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 (3.15V)
- Voltage - Output (Max):
- 6.5V
- Voltage Dropout (Max):
- 0.12V @ 50mA
- Current - Output:
- 120mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 82 µA
- PSRR:
- -
- Control Features:
- 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
MAX8873TEUK+ FAQ
1.How can I place an order for MAX8873TEUK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8873TEUK+ 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 MAX8873TEUK+ reliable?
The price and inventory of MAX8873TEUK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8873TEUK+ is usually 5 days.
3.What payment methods are accepted for MAX8873TEUK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8873TEUK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8873TEUK+?
MAX8873TEUK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8873TEUK+ 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 MAX8873TEUK+?
For technical support, including MAX8873TEUK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8873TEUK+ requirements.
6.How does Aetrix verify that MAX8873TEUK+ is sourced from the original manufacturer or authorized distributors?
All MAX8873TEUK+ 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 MAX8873TEUK+ meets industry standards.
7.What is the process for return or replacement of MAX8873TEUK+?
All MAX8873TEUK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8873TEUK+, 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 MAX8873TEUK+ part is unused and in its original packaging.
Return procedure for MAX8873TEUK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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