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Analog Devices Inc./Maxim Integrated MAX1725EUK+T
- Part No.:
- MAX1725EUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1725EUK+T.pdf
- Description:
- IC REG LIN POS ADJ 20MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,463
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Product details
Overview
MAX1725EUK+T from Maxim Integrated is an ultra-low quiescent current (2µA), adjustable-output (1.5V to 5V), low-dropout linear regulator in a 5-pin SOT23 package, designed for battery-powered systems requiring extended runtime and tight output accuracy (±1.5%). It features reverse-battery protection, thermal shutdown, short-circuit foldback limiting, and stable operation with only 1µF output capacitance - ideal for microcontroller power and real-time clock backup in smoke detectors and smart battery packs.
For engineers reviewing the MAX1725EUK+T datasheet, MAX1725EUK+T pinout, MAX1725EUK+T application, or MAX1725EUK+T equivalent, key selection criteria include its 2µA supply current across full temperature range (-40°C to +85°C), PMOS pass transistor architecture enabling ultra-low dropout performance, feedback-based voltage adjustability, and robust protection features critical for safety-critical low-power embedded designs.
Technical Context
The MAX1725EUK+T implements a precision 1.245V internal reference error amplifier that compares FB voltage against this threshold to control a p-channel MOSFET pass element - eliminating base-drive current and enabling consistent 2µA quiescent current even in dropout. Its feedback architecture requires external R1/R2 resistors (R2 = 1.2MΩ recommended) to set output voltage per VOUT = 1.245V × (1 + R1/R2).
Protection circuitry includes thermal shutdown at +150°C with 15°C hysteresis, reverse-battery detection limiting VIN-reverse current to <10µA, and foldback current limiting that caps short-circuit output current at ~40mA. Shutdown is activated by driving SHDN < 0.5V, reducing supply current to 0.7µA while disconnecting OUT from IN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 2µA typical over full load/temperature range - enables multi-year battery life in always-on sensors. |
| Output Voltage Range | Adjustable 1.5V to 5V via external resistor divider - supports diverse core/logic voltage requirements. |
| Output Accuracy | ±1.5% over -40°C to +85°C - ensures reliable operation of precision analog or timing circuits. |
| Input Voltage Range | +2.5V to +12V - compatible with 2-cell Li+ (up to 8.4V), 9V alkaline, or regulated intermediate rails. |
| Dropout Voltage | 600mV max at 20mA load (TA = +85°C) - maintains regulation under weak battery conditions. |
| Output Capacitance | 1µF minimum ceramic - enables compact, low-BOM-count designs without stability compromises. |
| Protection Features | Reverse-battery (<10µA reverse current), thermal shutdown (+150°C), foldback short-circuit limiting (~40mA) - eliminates need for external protection components. |
Pinout & Package
MAX1725EUK+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+1, outline 21-0057), with 1.3mm × 2.9mm footprint and 0.95mm height - suitable for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts +2.5V to +12V; reverse-battery protection active when VIN < 0V. |
| 2 - GND | Analog and power ground reference | Common return path for internal bias, error amplifier, and shutdown logic. |
| 3 - OUT | Regulated output terminal | Delivers up to 20mA with ±1.5% accuracy; connects to load and output capacitor. |
| 4 - FB | Feedback input for output voltage setting | Monitors divided output voltage; internal 1.245V reference sets VOUT = 1.245V × (1 + R1/R2). |
| 5 - SHDN | Active-low shutdown control | Pull below 0.5V to disable regulator and reduce IQ to 0.7µA; connect to IN for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 2µA across full operating range - extends shelf life and operational runtime in battery-backed systems. |
| PMOS pass transistor architecture | Eliminates base-drive current loss and saturation effects - maintains low IQ in dropout unlike PNP regulators. |
| Reverse-battery protection | Blocks >99.9% of reverse current (<10µA) without external diodes - prevents damage during battery insertion errors. |
| Thermal shutdown with hysteresis | +150°C trip with 15°C cooldown before restart - enables safe fault recovery in sealed enclosures. |
| Stable with 1µF ceramic output cap | No ESR requirements or compensation networks needed - simplifies layout and reduces BOM count. |
Applications
| Smoke Detectors | Remote Transmitters |
|---|---|
|
Use Scenario: Long-life, self-powered residential smoke alarms operating on 9V alkaline batteries with 10-year shelf life requirements. IC Role / Device Role / Timing Role: Primary 3.3V supply for MCU and sensor interface, maintaining regulation as battery decays from 9V to 4.5V. Use Value: 2µA IQ minimizes standby drain; reverse-battery protection prevents damage if battery is inserted backward during replacement. |
Use Scenario: Wireless sensor nodes transmitting temperature/humidity data every 5 minutes using sub-GHz RF ICs. IC Role / Device Role / Timing Role: Clean, low-noise 2.5V rail for RF transceiver and ADC, isolated from noisy digital switching. Use Value: 350µVRMS output noise and 60dB PSRR at 100Hz ensure RF sensitivity isn't degraded by power-supply ripple. |
| Smart Battery Packs | Microcontroller Power |
|
Use Scenario: Lithium-ion battery packs with integrated fuel gauges and protection ICs requiring independent 3.3V supply. IC Role / Device Role / Timing Role: Dedicated LDO for gas gauge MCU and EEPROM, powered directly from pack voltage (6–8.4V). Use Value: Wide 2.5–12V input range accommodates full cell voltage swing; thermal shutdown prevents overheating during fault conditions. |
Use Scenario: Low-power ARM Cortex-M0+ microcontrollers in industrial edge sensors operating from coin cells or energy harvesters. IC Role / Device Role / Timing Role: Core voltage regulator delivering 1.8V or 3.3V to MCU VDD, with fast load-transient response to handle burst-mode operation. Use Value: 200mV load-transient overshoot/undershoot with 1µF COUT ensures stable clocking and memory access during wake-up events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS78033DRVR | Fixed 3.3V output; 500nA IQ; 200mA output current; 6-pin WSON package. | Lacks adjustable output and reverse-battery protection; higher output current but larger footprint. | Select when fixed 3.3V and ultra-low IQ (<1µA) are mandatory, and reverse-battery risk is mitigated externally. |
| Analog Devices ADP160ACBZ-3.3-R7 | Fixed 3.3V output; 850nA IQ; 150mA output; 5-pin TSOT-23 package. | No adjustable option or reverse-battery protection; slightly higher IQ than MAX1725EUK+T but better PSRR above 1kHz. | Choose for cost-sensitive consumer devices where fixed 3.3V suffices and board space allows TSOT-23. |
Compared with TPS78033DRVR and ADP160ACBZ-3.3-R7, the MAX1725EUK+T uniquely combines adjustable output voltage, reverse-battery protection, and 2µA IQ in a 5-pin SOT23 - making it the only option among the three that supports both flexible voltage scaling and intrinsic battery polarity fault tolerance in minimal area.
Availability
MAX1725EUK+T is available at Aetrix Electronics and suitable for smoke detectors, remote transmitters, and smart battery packs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1725EUK+T 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.
The MAX1725/MAX1726 series was designed specifically for ultra-low-power battery-operated systems demanding maximum runtime, robust fault protection, and minimal external components - targeting applications like portable medical devices, wireless sensors, and backup power subsystems.
FAQ
What is the maximum input voltage rating for the MAX1725EUK+T?
The MAX1725EUK+T has an absolute maximum input voltage of +14V, but its specified operating input voltage range is +2.5V to +12V. Exceeding +12V may cause functional degradation or reduced reliability, even if within absolute maximum limits. For sustained operation, keep VIN ≤ +12V as defined in the Electrical Characteristics table.
Can the MAX1725EUK+T be used with a 1µF ceramic output capacitor?
Yes, the MAX1725EUK+T is explicitly characterized and guaranteed stable with a minimum 1µF ceramic output capacitor - no ESR requirements or additional compensation components are needed. This simplifies design and reduces bill-of-materials cost compared to older LDOs requiring tantalum or higher-ESR capacitors.
How does the MAX1725EUK+T achieve reverse-battery protection?
The MAX1725EUK+T integrates internal circuitry that detects reversed input polarity and disconnects internal parasitic paths, limiting reverse current to less than 10µA when VIN is forced below ground. This protection operates without external diodes and remains active regardless of SHDN state - a key differentiator from standard LDOs.
What is the feedback reference voltage (VFB) of the MAX1725EUK+T?
The MAX1725EUK+T uses a precision internal reference of 1.245V at the FB pin. Output voltage is set by the external resistor divider as VOUT = 1.245V × (1 + R1/R2), with R2 = 1.2MΩ recommended for optimal accuracy across temperature and line variations.
Does the MAX1725EUK+T require a minimum load current to maintain regulation?
No, the MAX1725EUK+T does not require a minimum load current. It maintains regulation and specified accuracy down to zero load current, enabled by its PMOS pass transistor architecture and low-IQ bias design - essential for intermittent-load applications like wake-on-radio sensors.
MAX1725EUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.6V @ 20mA
- Current - Output:
- 20mA
- Current - Quiescent (Iq):
- 4.5 µA
- Current - Supply (Max):
- -
- 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
MAX1725EUK+T FAQ
1.How can I place an order for MAX1725EUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1725EUK+T 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 MAX1725EUK+T reliable?
The price and inventory of MAX1725EUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1725EUK+T is usually 5 days.
3.What payment methods are accepted for MAX1725EUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1725EUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1725EUK+T?
MAX1725EUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1725EUK+T 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 MAX1725EUK+T?
For technical support, including MAX1725EUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1725EUK+T requirements.
6.How does Aetrix verify that MAX1725EUK+T is sourced from the original manufacturer or authorized distributors?
All MAX1725EUK+T 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 MAX1725EUK+T meets industry standards.
7.What is the process for return or replacement of MAX1725EUK+T?
All MAX1725EUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1725EUK+T, 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 MAX1725EUK+T part is unused and in its original packaging.
Return procedure for MAX1725EUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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