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Analog Devices Inc./Maxim Integrated MAX16999AUA25+T
- Part No.:
- MAX16999AUA25+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX16999AUA25+T.pdf
- Description:
- IC REG LINEAR 2.5V 100MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,800
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Product details
Overview
MAX16999AUA25+T from Maxim Integrated is a high-temperature ultra-low-quiescent-current linear regulator delivering 100mA at preset 2.5V output, operating from 2.5V to 5.5V input, featuring active-low open-drain RESET with capacitor-programmable timeout, logic-controlled EN, and thermal/short-circuit protection - used to power microcontroller core or interrupt sections during sleep mode in automotive telematics and industrial keep-alive systems.
For engineers reviewing the MAX16999AUA25+T datasheet, MAX16999AUA25+T pinout, MAX16999AUA25+T application, or MAX16999AUA25+T equivalent, key selection criteria include guaranteed operation up to +125°C ambient, 13μA quiescent current at light load, ±2.5% output voltage accuracy, adjustable POR delay via CRES capacitor, and thermal shutdown at +165°C junction temperature.
Technical Context
The MAX16999AUA25+T integrates a p-channel MOSFET pass transistor, precision bandgap reference, error amplifier, and dual-timer POR circuitry. Its reset timeout is set by external CRES capacitance charging at 10μA (typ), with fault timer limiting maximum timeout to 100ms if CRES fails shorted.
It employs undervoltage lockout (UVLO) with 2.2V rising threshold and 45mV hysteresis, latched EN input with 120kΩ internal pullup/pulldown, and dropout voltage as low as 35mV at 80mA for VOUT = 3.3V - confirming suitability for low-headroom, always-on subsystems requiring stable bias under wide VIN and temperature variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports direct connection to automotive battery rails with transient tolerance up to +6V on IN. |
| Output Voltage | 2.5V (factory-trimmed, fixed) - matches common I/O or interface supply rails without external feedback components. |
| Max Output Current | 100mA at TA = +125°C - sufficient for MCU core retention, RTC, or small SRAM banks in high-temp environments. |
| Quiescent Current | 13μA (typ) at 100μA load - enables multi-year battery life in always-on keep-alive applications. |
| Reset Timeout Range | 30ms to 80ms (programmable via CRES) - ensures reliable power-up sequencing across varying board parasitics and temperature. |
| Droput Voltage | 35mV (typ) at 80mA, VOUT = 3.3V - maintains regulation even when input sags to 3.335V, critical for brownout resilience. |
| Thermal Shutdown | +165°C with 15°C hysteresis - provides fail-safe protection during sustained overload or poor PCB heatsinking. |
Pinout & Package
MAX16999AUA25+T uses an 8-pin μMAX® package with exposed pad (U8E+2 outline), optimized for thermal performance in high-density industrial and automotive PCBs. The exposed paddle must be soldered to a large ground plane for θJA = 77.6°C/W (multilayer).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT | Regulator output | Delivers regulated 2.5V; high-impedance when EN = low; requires 4.7μF ceramic bypass to GND. |
| 3 - CRES | POR timer capacitor node | Charged at 10μA (typ); sets RESET timeout; discharges via pulldown when EN = low. |
| 4 - RESET | Open-drain active-low reset flag | Pulled low when VOUT < 82.5% of nominal; high-impedance during regulation or shutdown. |
| 5 - GND | Analog/digital ground | Must connect directly to PCB ground plane and exposed paddle; serves as return for all currents. |
| 6 - EN | Active-high enable | Drives regulator ON/OFF; latched internally; 70% VIN threshold for logic-high recognition. |
| 7, 8 - IN | Input supply | Accepts 2.5V–5.5V; bypassed with ≥1μF ceramic capacitor; UVLO disables output below 2.2V. |
| EP - Exposed Paddle | Thermal pad / GND extension | Electrically connected to GND; mandatory for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 13μA typical at light load - extends battery life in always-on systems without sacrificing regulation stability. |
| Capacitor-programmable POR delay | 30–80ms timeout range via CRES - eliminates need for external timing ICs while enabling board-specific sequencing control. |
| Integrated thermal and short-circuit protection | Auto-recovering +165°C shutdown with 15°C hysteresis - prevents permanent damage during sustained overload or layout faults. |
| Latched logic-enable input | 120kΩ internal pullup/pulldown - maintains last known state if EN trace disconnects, improving system robustness in harsh environments. |
| High-temperature operation | Guaranteed performance from –40°C to +125°C ambient - qualified for under-hood automotive and industrial control applications. |
Applications
| Microcontroller Sleep Power | SDRAM Standby Supply |
|---|---|
Use Scenario: Powers MCU core or interrupt controller during deep-sleep mode where main supply is shut down. IC Role / Device Role / Timing Role: Low-quiescent parallel regulator providing always-on 2.5V bias to retain register state and wake-on-interrupt capability. Use Value: Enables >10-year battery-backed operation with 13μA IQ, eliminating need for discrete LDO + external POR circuitry. | Use Scenario: Supplies SDRAM I/O or termination voltage during system standby to prevent data loss. IC Role / Device Role / Timing Role: Stable 2.5V rail generator with programmable reset assertion time to coordinate memory retention sequence. Use Value: Ensures SDRAM remains powered and ready within 80ms of main supply restoration, avoiding reinitialization delays. |
| Keep-Alive Timer Bias | Industrial Sensor Node Core Supply |
Use Scenario: Provides continuous bias to real-time clock (RTC) or watchdog timer IC during host processor shutdown. IC Role / Device Role / Timing Role: Always-on 2.5V source with precise reset timeout to guarantee clean timer startup after power recovery. Use Value: Delivers deterministic 30–80ms POR window independent of capacitor aging or temperature drift, meeting IEC 61508 functional safety timing requirements. | Use Scenario: Powers sensor signal chain and low-power MCU in remote industrial monitoring nodes operating at +125°C ambient. IC Role / Device Role / Timing Role: High-temp-stable 2.5V regulator with thermal shutdown and UVLO, enabling reliable long-term deployment in enclosures without forced cooling. Use Value: Maintains ±2.5% output accuracy over –40°C to +125°C and delivers full 100mA at max ambient - no derating required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0525PDBVR | Lower IQ (250nA typ), but only 200mA rated at +85°C; no integrated POR timer or CRES pin. | Best for ultra-low-power battery-only systems without sequencing needs; lacks reset timeout programmability. | Select when minimum IQ dominates design priority and external reset logic is acceptable. |
| NCP114AMX25T2G | Higher IQ (40μA typ), rated for 150mA at +85°C; no thermal shutdown or CRES-based POR. | Suitable for cost-sensitive consumer applications; requires external reset IC for power sequencing. | Select for non-automotive, non-industrial use cases where extended temperature range and integrated POR are not required. |
Compared with TPS7A0525PDBVR and NCP114AMX25T2G, the MAX16999AUA25+T uniquely combines 13μA IQ, guaranteed +125°C operation, capacitor-programmable POR, and integrated thermal protection - making it the only option qualified for automotive telematics and industrial keep-alive systems demanding single-chip reliability.
Availability
MAX16999AUA25+T is available at Aetrix Electronics and suitable for automotive telematics, industrial keep-alive timers, and high-temperature microcontroller sleep power applications requiring stable component supply across extended lifecycle and temperature ranges.
Supply support for MAX16999AUA25+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, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX16999 series was developed specifically for high-reliability, high-temperature linear regulation in automotive and industrial subsystems requiring ultra-low IQ, integrated POR, and robust fault protection - targeting always-on microcontroller bias and memory retention.
FAQ
What is the exact output voltage of MAX16999AUA25+T?
The MAX16999AUA25+T is factory-trimmed to deliver a fixed 2.5V output voltage. This value is confirmed in the Selector Guide (suffix "25") and validated across –40°C to +125°C ambient with ±2.5% accuracy under specified load and input conditions. No external resistors or feedback network is required.
Does MAX16999AUA25+T support operation at +125°C ambient temperature?
Yes, MAX16999AUA25+T is fully specified and guaranteed to deliver 100mA continuous output current at TA = +125°C, with thermal shutdown activated at TJ = +165°C. Its BiCMOS process and μMAX-EP package enable reliable operation in under-hood automotive and industrial control environments without derating.
How is the reset timeout programmed on MAX16999AUA25+T?
The reset timeout on MAX16999AUA25+T is set by an external capacitor connected to the CRES pin. A 10μA (typ) internal current charges this capacitor; RESET transitions from low to high-impedance when CRES voltage reaches 600mV (typ). For example, a 15nF capacitor yields ~30ms timeout per the formula t = CCRES × 60 × 10³.
What protection features does MAX16999AUA25+T include?
MAX16999AUA25+T integrates short-circuit protection (continuous output short allowed), thermal-overload protection (+165°C shutdown with 15°C hysteresis), input undervoltage lockout (2.2V threshold), and CRES short-fault detection with 100ms internal timeout limit - ensuring robust operation in unattended or harsh-environment deployments.
Can MAX16999AUA25+T be used in parallel with another regulator?
Yes, MAX16999AUA25+T is explicitly designed for parallel operation with another equal-voltage supply (e.g., a high-current DC-DC converter), as documented in the Applications Information section. Its low dropout and stable loop response prevent current hogging, enabling efficient hybrid power architectures for microcontrollers with dynamic load profiles.
MAX16999AUA25+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 20 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB ~ 40dB (100Hz ~ 100kHz)
- Control Features:
- Enable, Power On Reset, Reset
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX-EP|8-uSOP-EP
MAX16999AUA25+T FAQ
1.How can I place an order for MAX16999AUA25+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16999AUA25+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 MAX16999AUA25+T reliable?
The price and inventory of MAX16999AUA25+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16999AUA25+T is usually 5 days.
3.What payment methods are accepted for MAX16999AUA25+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16999AUA25+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16999AUA25+T?
MAX16999AUA25+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16999AUA25+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 MAX16999AUA25+T?
For technical support, including MAX16999AUA25+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16999AUA25+T requirements.
6.How does Aetrix verify that MAX16999AUA25+T is sourced from the original manufacturer or authorized distributors?
All MAX16999AUA25+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 MAX16999AUA25+T meets industry standards.
7.What is the process for return or replacement of MAX16999AUA25+T?
All MAX16999AUA25+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16999AUA25+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 MAX16999AUA25+T part is unused and in its original packaging.
Return procedure for MAX16999AUA25+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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