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Analog Devices Inc./Maxim Integrated MAX16999AUA25+
- Part No.:
- MAX16999AUA25+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX16999AUA25+.pdf
- Description:
- IC REG LINEAR 2.5V 100MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,185
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Product details
Overview
MAX16999AUA25+ from Maxim Integrated is a high-temperature ultra-low-quiescent-current linear regulator delivering 100mA at preset 2.5V output, operating from 2.5V–5.5V input, with 13μA typical quiescent current and active-low open-drain reset output. It serves as a parallel low-power supply for microcontroller core/interrupt sections during sleep mode in automotive telematics and industrial control systems.
For engineers reviewing the MAX16999AUA25+ datasheet, MAX16999AUA25+ pinout, MAX16999AUA25+ application, or MAX16999AUA25+ equivalent, key selection criteria include guaranteed operation to +125°C ambient, adjustable POR delay via CRES capacitor, logic-controlled enable (EN), thermal-overload protection, and compatibility with multilayer PCB thermal management.
Technical Context
The MAX16999AUA25+ integrates a p-channel MOSFET pass transistor, precision error amplifier, internal voltage reference, and dual-timer POR circuitry. Its reset timeout is programmable via external CRES capacitor charging at 10μA, with threshold detection at 600mV and deglitching of 30μs.
It features undervoltage lockout (UVLO) with 2.2V rising threshold and 45mV hysteresis, latched EN input with 120kΩ internal pullup/pulldown, and thermal shutdown at +165°C with 15°C hysteresis - enabling robust operation in harsh environments without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V (factory-trimmed, ±2.5% accuracy over -40°C to +125°C) |
| Input Voltage Range | 2.5V to 5.5V - supports wide-input industrial and automotive battery-supplied systems |
| Quiescent Current | 13μA typical - enables multi-year battery life in always-on keep-alive timer applications |
| Max Output Current | 100mA continuous at TA = +125°C - verified per Table 1 for 2.5V output on multilayer PCB |
| Dropout Voltage | 0.035V at 80mA, VOUT = 3.3V - indicates ultra-low dropout design optimized for low-VIN operation |
| Reset Timeout Range | 30ms to 80ms (CRES = GND) - provides configurable power-on reset timing independent of supply ramp rate |
| Thermal Shutdown | +165°C junction temperature with 15°C hysteresis - ensures self-recovery under sustained overload |
Pinout & Package
MAX16999AUA25+ is housed in an 8-pin μMAX® package with exposed pad (U8E+2 outline), requiring connection of EP to ground plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT | Regulator output | Bypassed with 4.7µF ceramic capacitor; goes high-impedance when EN = low - enables seamless parallel supply operation |
| 3 - CRES | POR timer node | Charged at 10µA to set reset timeout; discharges via 1mA pulldown when EN = low - defines reliable startup sequencing |
| 4 - RESET | Active-low open-drain reset | Pulled low when VOUT drops below 82.5% nominal; high-impedance during regulation - interfaces directly with µC reset inputs |
| 5 - GND | Power and signal ground | Must connect directly to large PCB ground plane and EP - critical for thermal dissipation and noise immunity |
| 6 - EN | Active-high enable | Latched input with 120kΩ internal bias; drives OUT high-impedance and reduces IQ to <0.3µA in shutdown - supports system-level power gating |
| 7, 8 - IN | Input supply | Bypassed with ≥1µF ceramic capacitor; UVLO active below 2.2V - prevents erratic behavior during brownout |
| EP - Exposed Pad | Thermal pad / secondary ground | Electrically tied to GND; mandatory connection to maximize θJA (77.6°C/W multilayer) and prevent thermal shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 13μA typical enables >10-year battery life in keep-alive timers and SDRAM standby supplies |
| Adjustable POR delay | Programmable via CRES capacitor (e.g., 15nF → ~45ms) - eliminates need for external RC timing circuits |
| Parallel supply capability | OUT goes high-impedance during shutdown - allows safe co-location with higher-current regulators at same voltage |
| Robust fault protection | Integrated short-circuit, thermal-overload, and UVLO - removes requirement for external current-sense or thermal sensors |
| High-temperature operation | Guaranteed 100mA output at TA = +125°C on multilayer PCB - qualified for under-hood and industrial control environments |
Applications
| SDRAM Power Supplies | Keep-Alive Timers |
|---|---|
Use Scenario: Maintaining SDRAM I/O or standby voltage during system suspend cycles in industrial HMIs and network routers. IC Role / Device Role / Timing Role: Low-IQ linear regulator supplying fixed 2.5V to SDRAM VDDQ rail while main supply is off. Use Value: 13μA quiescent current minimizes standby power draw; high-impedance OUT prevents backfeed into main supply during suspend. |
Use Scenario: Powering real-time clock (RTC) or watchdog timer ICs in automotive telematics modules during ignition-off periods. IC Role / Device Role / Timing Role: Always-on 2.5V supply with programmable POR delay ensuring clean RTC initialization after battery reconnection. Use Value: Adjustable CRES-based reset timeout guarantees deterministic wake-up timing regardless of battery voltage ramp rate. |
| Handheld/Portable Devices | Industrial Control Systems |
Use Scenario: Supplying backup voltage to SRAM or configuration memory in medical handhelds and portable test equipment. IC Role / Device Role / Timing Role: Secondary low-power regulator activated by EN signal during host processor sleep, delivering stable 2.5V. Use Value: Logic-controlled enable and <0.3μA shutdown current extend battery runtime; ±2.5% output accuracy preserves memory integrity. |
Use Scenario: Providing regulated 2.5V to microcontroller interrupt controller or analog sensor interface in PLC I/O modules. IC Role / Device Role / Timing Role: Parallel low-IQ supply supporting µC core during deep-sleep modes while main 3.3V rail remains active. Use Value: Thermal shutdown at +165°C and operation to +125°C ambient ensure reliability in enclosed industrial enclosures without forced cooling. |
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 | 250mA output, 25μA IQ, no integrated POR/reset; SOT-23-5 package | Lacks reset output and CRES-programmable POR - requires external supervisor for sequencing | Choose when higher output current is needed and reset functionality is handled externally |
| NCP1117ST25T3G | 1A output, 6mA IQ, fixed 2.5V, no enable or reset; SOT-223 package | No logic control, no reset flag, higher IQ - unsuitable for ultra-low-power always-on use cases | Choose only for cost-sensitive, non-battery, non-sequencing applications where 6mA IQ is acceptable |
Compared with TPS7A0525PDBVR and NCP1117ST25T3G, the MAX16999AUA25+ uniquely combines 100mA output, 13μA IQ, integrated active-low reset, and CRES-programmable POR - making it the only option among the three qualified for automotive-grade high-temperature always-on microcontroller auxiliary supplies.
Availability
MAX16999AUA25+ is available at Aetrix Electronics and suitable for industrial control systems, automotive telematics modules, and portable medical devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX16999AUA25+ 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 belongs to Maxim's high-temperature linear regulator product line, engineered specifically for always-on auxiliary power domains in microcontrollers and memory subsystems operating up to +125°C ambient.
FAQ
What is the output voltage tolerance of the MAX16999AUA25+ over temperature?
The MAX16999AUA25+ delivers 2.5V output with ±2.5% accuracy over the full -40°C to +125°C operating temperature range, as specified in the DC Electrical Characteristics table under "Output-Voltage Accuracy" with VIN = VOUT + 2V and IOUT = 1mA to 100mA. This tolerance is factory-trimmed and guaranteed by design, not just tested at +25°C.
How does the CRES pin determine the reset timeout in the MAX16999AUA25+?
In the MAX16999AUA25+, the CRES pin connects to an internal 10μA constant-current source that charges an external capacitor. When the voltage across that capacitor reaches 600mV (typical), the RESET output transitions from low to high-impedance. The timeout is calculated as t = CCRES × 60 × 10³ seconds, where CCRES is in farads - so a 15nF capacitor yields ~45ms delay.
Can the MAX16999AUA25+ be used in parallel with another regulator?
Yes, the MAX16999AUA25+ is explicitly designed for parallel operation: its OUT pin goes high-impedance when EN is low, preventing backfeed or contention. The datasheet Figure 2 shows it used alongside a 3.3V, 1A supply to provide low-IQ core bias during µC sleep - enabling efficient hybrid power architectures without external OR-ing diodes.
What is the maximum continuous output current for MAX16999AUA25+ at +125°C ambient?
Per Table 1 in the datasheet, the MAX16999AUA25+ delivers 100mA continuous output current at TA = +125°C when mounted on a multilayer PCB with VIN = 5V. This rating assumes proper thermal design including EP-to-ground connection and accounts for derating due to θJA = 77.6°C/W.
Does the MAX16999AUA25+ include thermal protection, and how does it behave?
Yes, the MAX16999AUA25+ includes thermal-overload protection that activates at +165°C junction temperature. Once triggered, the pass transistor turns off until the junction cools by 15°C (hysteresis), resulting in pulsed output under sustained overload. This protects the device without requiring external thermal monitoring circuitry.
MAX16999AUA25+ 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:
- Tube
- 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+ FAQ
1.How can I place an order for MAX16999AUA25+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16999AUA25+ 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+ reliable?
The price and inventory of MAX16999AUA25+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16999AUA25+ is usually 5 days.
3.What payment methods are accepted for MAX16999AUA25+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16999AUA25+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16999AUA25+?
MAX16999AUA25+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16999AUA25+ 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+?
For technical support, including MAX16999AUA25+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16999AUA25+ requirements.
6.How does Aetrix verify that MAX16999AUA25+ is sourced from the original manufacturer or authorized distributors?
All MAX16999AUA25+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX16999AUA25+?
All MAX16999AUA25+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16999AUA25+, 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+ part is unused and in its original packaging.
Return procedure for MAX16999AUA25+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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