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Analog Devices Inc./Maxim Integrated MAX16999AUA18+
- Part No.:
- MAX16999AUA18+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX16999AUA18+.pdf
- Description:
- IC REG LINEAR 1.8V 100MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,038
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Product details
Overview
MAX16999AUA18+ from Maxim Integrated is a low-quiescent-current linear regulator delivering 100mA at up to +125°C, with preset 1.8V output, 13μA typical quiescent current, and active-low open-drain reset with capacitor-programmable timeout. It powers microcontroller core/interrupt sections during sleep mode in automotive telematics and industrial keep-alive timer applications.
For engineers reviewing the MAX16999AUA18+ datasheet, MAX16999AUA18+ pinout, MAX16999AUA18+ application, or MAX16999AUA18+ equivalent, key selection criteria include ultra-low IQ for always-on operation, thermal shutdown at +165°C, adjustable POR delay via CRES, logic-controlled enable, and 8-pin μMAX-EP package compatibility with high-temperature PCB layouts.
Technical Context
The MAX16999AUA18+ integrates a p-channel MOSFET pass transistor, precision error amplifier, and internal voltage reference to regulate 1.8V output from 2.5V–5.5V input. Its POR circuit uses a 10μA CRES pullup current charging an external capacitor to generate a reset timeout, with fault-timer fallback ensuring startup even if CRES shorts.
Logic-controlled EN latches its state via 120kΩ internal resistors, enabling reliable shutdown with sub-1μA standby current. Thermal protection activates at +165°C junction temperature with 15°C hysteresis, while undervoltage lockout (2.2V threshold, 45mV hysteresis) prevents regulation until stable input is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 1.8V ±2.5% - matches common microcontroller core supply rails without external feedback components. |
| Quiescent Current | 13μA typical - enables multi-year battery life in always-on keep-alive circuits. |
| Max Output Current | 100mA at TA = +125°C - sustains full load under high-temperature industrial conditions. |
| Droput Voltage | 0.035V at 80mA, VOUT = 3.3V - ensures regulation down to VIN = 1.835V for 1.8V output. |
| Reset Timeout Range | 30ms to 80ms (CRES = GND) - provides configurable power-on sequencing window for system initialization. |
| Thermal Shutdown | +165°C with 15°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| UVLO Threshold | 2.2V max with 45mV hysteresis - blocks regulation until input stabilizes above brownout level. |
Pinout & Package
MAX16999AUA18+ is housed in an 8-pin μMAX® package with exposed pad (U8E+2 outline), optimized for thermal dissipation on multilayer PCBs (θJA = 77.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 OUT | Regulator output | Delivers regulated 1.8V; high-impedance when EN = low; requires 4.7µF ceramic bypass to GND. |
| 3 CRES | POR timing node | Charged by 10µA internal current to set reset timeout; connects to external capacitor for programmable delay. |
| 4 RESET | Active-low open-drain flag | Pulled low when VOUT drops below 82.5% of nominal; high-impedance during regulation or shutdown. |
| 5 GND | Power ground | Must connect directly to large PCB ground plane and exposed paddle (EP) for thermal and noise performance. |
| 6 EN | Active-high enable | Drives regulator ON/OFF; latched internally; pulls IN to GND when low to discharge CRES. |
| 7,8 IN | Input supply | Accepts 2.5V–5.5V; requires ≥1µF ceramic bypass to GND near pins to suppress source impedance. |
| EP | Exposed thermal pad | Serves as primary heatsink; must be soldered to solid ground plane to achieve rated 100mA at +125°C. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Controlled Enable | EN pin latches last state via 120kΩ internal resistor, eliminating need for external pull-up and preventing spurious wake-up from floating lines. |
| Adjustable POR Delay Flag | CRES pin allows precise reset timeout tuning (e.g., 15nF → ~50ms) independent of supply rail, enabling robust power sequencing across voltage domains. |
| Parallel Supply Operation | Designed to operate alongside higher-current regulators at same voltage, sharing load while maintaining ultra-low IQ for standby efficiency. |
| Short-to-GND Protection on Reset Timer | Internal fault timer limits CRES timeout to 100ms if capacitor shorts, preventing indefinite reset assertion and ensuring system boot reliability. |
| High-Temperature Operation | Guaranteed 100mA output and full functionality from –40°C to +125°C ambient, validated for under-hood and industrial control environments. |
Applications
| Automotive Telematics Power | Industrial Keep-Alive Timers |
|---|---|
Use Scenario: Powering GPS/GSM module microcontrollers during vehicle ignition-off state to maintain network registration and location tracking. IC Role / Device Role / Timing Role: Low-quiescent 1.8V supply for MCU core and interrupt controller, enabling wake-on-event while drawing <15μA total. Use Value: Extends battery backup runtime beyond 30 days without recharge, meeting OEM requirements for connected-car always-on functionality. | Use Scenario: Providing stable bias to real-time clock (RTC) and watchdog timer ICs in PLCs and motor drives during main power loss. IC Role / Device Role / Timing Role: Always-on 1.8V source with POR reset flag to guarantee clean RTC initialization after brownout recovery. Use Value: Eliminates timekeeping drift and watchdog false triggers by ensuring regulated voltage before timer activation. |
| SDRAM Memory Backup | Handheld Device Sleep Mode |
Use Scenario: Maintaining SDRAM data retention voltage during system suspend in industrial HMIs and medical displays. IC Role / Device Role / Timing Role: Parallel low-IQ regulator supplying 1.8V to SDRAM VDDQ while main supply shuts down. Use Value: Reduces total system standby power by >90% versus using main LDO, preserving volatile memory contents for rapid resume. | Use Scenario: Powering ARM Cortex-M interrupt controller and SRAM during deep-sleep cycles in portable test equipment. IC Role / Device Role / Timing Role: Dedicated 1.8V rail with EN-controlled shutdown and reset signaling to coordinate wake-up sequence with PMIC. Use Value: Achieves sub-20μA system sleep current while retaining full interrupt responsiveness and deterministic wake latency. |
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 |
|---|---|---|---|
| TPS7A0518PDBVR | 1.8V fixed output, 25μA IQ, no reset output, SOT-23-5 package | Lacks POR/reset functionality; unsuitable where power-sequencing or fault detection is required | Select only when reset signaling is handled externally and board space constraints favor SOT-23 over μMAX-EP. |
| NCP1117ST18T3G | 1.8V fixed output, 6mA IQ, 800mA current limit, TO-220/SOT-223 package | Higher IQ and larger footprint; lacks EN control, CRES programming, and thermal hysteresis | Prefer for cost-sensitive, non-automotive applications where 100mA load and ultra-low IQ are not mandatory. |
Compared with TPS7A0518PDBVR and NCP1117ST18T3G, the MAX16999AUA18+ uniquely combines 13μA quiescent current, integrated capacitor-programmable reset, logic-enable, and high-temperature 100mA capability in a thermally enhanced 8-pin μMAX-EP package-making it the only option for automotive-grade always-on subsystems requiring guaranteed POR behavior and minimal standby power.
Availability
MAX16999AUA18+ is available at Aetrix Electronics and suitable for automotive telematics, industrial keep-alive timers, and handheld device sleep-mode power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16999AUA18+ 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 targets high-reliability, high-temperature power management-specifically engineered to deliver ultra-low quiescent current and robust POR/reset functionality for always-on microcontroller subsystems in harsh environments.
FAQ
What is the exact output voltage of MAX16999AUA18+ and how is it set?
The MAX16999AUA18+ has a factory-preset output voltage of 1.8V, trimmed internally during production and guaranteed within ±2.5% accuracy across temperature and load. This fixed value is encoded in the "18" suffix per the Selector Guide and requires no external resistors or configuration-enabling drop-in use for 1.8V core or I/O rail applications without feedback network design.
How does the CRES pin function in MAX16999AUA18+ and what capacitor value sets a 50ms reset timeout?
The CRES pin in MAX16999AUA18+ sources a 10μA internal current to charge an external capacitor, generating a voltage ramp that controls reset timeout duration. Using the formula t = CCRES × 60 × 10³, a 15nF capacitor yields approximately 50ms delay (15 × 10⁻⁹ × 60 × 10³ = 0.045s). The MAX16999AUA18+ datasheet confirms this relationship and specifies CRES voltage threshold at 600mV typical.
Does MAX16999AUA18+ support parallel operation with other regulators, and what design considerations apply?
Yes, MAX16999AUA18+ is explicitly designed for parallel operation with other regulators of equal output voltage, as documented in the Applications Information section. Key considerations include matching output voltages within tolerance, using low-ESR ceramic capacitors (≤30mΩ) at both IN and OUT, and routing traces symmetrically to minimize current imbalance. The MAX16999AUA18+'s low dropout and tight load regulation ensure stable current sharing without external ballast components.
What thermal derating applies to MAX16999AUA18+ at +125°C ambient, and how is power dissipation managed?
At TA = +125°C, MAX16999AUA18+ delivers full 100mA output on multilayer PCBs (θJA = 77.6°C/W), with continuous power dissipation limited to 1030.9mW at +70°C and derated by 12.9mW/°C above that point. The exposed pad (EP) must be soldered to a large ground plane to achieve specified θJC = 4.8°C/W; failure to do so risks thermal shutdown at +165°C junction temperature, which activates with 15°C hysteresis to prevent oscillation.
Is MAX16999AUA18+ qualified for automotive applications, and what reliability features support this use case?
While MAX16999AUA18+ operates across –40°C to +125°C and includes automotive-relevant features-such as UVLO with hysteresis, thermal shutdown with hysteresis, and fault-tolerant POR-the device itself is not AEC-Q100 qualified, as confirmed in Revision 1 of the datasheet. Its design supports telematics and infotainment subsystems where extended temperature range and robust reset behavior are critical, but formal automotive qualification requires additional testing beyond the MAX16999AUA18+ specification.
MAX16999AUA18+ 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:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- 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
MAX16999AUA18+ FAQ
1.How can I place an order for MAX16999AUA18+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16999AUA18+ 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 MAX16999AUA18+ reliable?
The price and inventory of MAX16999AUA18+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16999AUA18+ is usually 5 days.
3.What payment methods are accepted for MAX16999AUA18+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16999AUA18+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16999AUA18+?
MAX16999AUA18+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16999AUA18+ 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 MAX16999AUA18+?
For technical support, including MAX16999AUA18+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16999AUA18+ requirements.
6.How does Aetrix verify that MAX16999AUA18+ is sourced from the original manufacturer or authorized distributors?
All MAX16999AUA18+ 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 MAX16999AUA18+ meets industry standards.
7.What is the process for return or replacement of MAX16999AUA18+?
All MAX16999AUA18+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16999AUA18+, 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 MAX16999AUA18+ part is unused and in its original packaging.
Return procedure for MAX16999AUA18+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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