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Analog Devices Inc./Maxim Integrated MAX16999AUA15+
- Part No.:
- MAX16999AUA15+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX16999AUA15+.pdf
- Description:
- IC REG LINEAR 1.5V 100MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,656
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Product details
Overview
MAX16999AUA15+ from Maxim Integrated is a low-quiescent-current linear regulator delivering 100mA at up to +125°C, with preset 1.5V output, 13μA typical quiescent current, and active-low open-drain reset with capacitor-programmable timeout. It serves as a parallel keep-alive supply for microcontroller core or interrupt sections during sleep mode in high-temperature automotive and industrial control systems.
For engineers reviewing the MAX16999AUA15+ datasheet, MAX16999AUA15+ pinout, MAX16999AUA15+ application, or MAX16999AUA15+ equivalent, key selection criteria include its ultra-low IQ, factory-trimmed 1.5V output, thermal shutdown at +165°C, adjustable POR delay via CRES, and operation across –40°C to +125°C ambient.
Technical Context
The MAX16999AUA15+ integrates a p-channel MOSFET pass transistor, precision error amplifier, and internal voltage reference to regulate output with ±2.5% accuracy over load (1mA–100mA) and temperature (–40°C to +125°C). Its power-on-reset circuit uses an internal 10μA pullup current on CRES to generate a programmable timeout before releasing RESET.
Logic-controlled enable (EN) latches state via 120kΩ internal resistors and reduces ground current to ≤1μA in shutdown. Protection includes short-circuit limiting (150mA typ), thermal shutdown with 15°C hysteresis, and UVLO (2.2V threshold with 45mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5V fixed (factory-trimmed, ±2.5% accuracy over temp/load) |
| Max Output Current | 100mA continuous at TA = +125°C (verified per Table 1, multilayer PCB) |
| Quiescent Current | 13μA typical at IOUT = 100μA (enables always-on system standby) |
| Droput Voltage | 0.035V typical at IOUT = 80mA, VOUT = 3.3V (low-loss regulation near VIN min) |
| Reset Timeout Range | 30–80ms (programmed by external CRES capacitor, e.g., 15nF yields ~45ms) |
| Operating Temp Range | –40°C to +125°C ambient (supports under-hood and industrial control environments) |
| Thermal Shutdown | +165°C junction with 15°C hysteresis (prevents latch-up during overload) |
Pinout & Package
MAX16999AUA15+ 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 1.5V; high-impedance when EN = low; bypassed with 4.7μF ceramic cap to GND |
| 3 CRES | POR timer node | Charged by 10μA internal current; sets RESET timeout via external capacitor (e.g., 15nF → ~45ms) |
| 4 RESET | Open-drain active-low reset | Pulled low when VOUT < 82.5% of nominal; high-impedance during regulation or shutdown |
| 5 GND | Power and signal ground | Must connect directly to large PCB ground plane and exposed paddle (EP) for thermal/EMI performance |
| 6 EN | Active-high enable | Drives regulator ON/OFF; latched with 120kΩ internal pullup/pulldown; <0.3μA standby current when low |
| 7,8 IN | Input supply | Accepts 2.5V–5.5V; bypassed with ≥1μF ceramic cap to GND; UVLO disables output below 2.2V |
| EP | Exposed thermal pad | Internally connected to GND; must be soldered to PCB thermal pad for θJC = 4.8°C/W cooling |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.5V output | Eliminates external feedback resistors; ensures ±2.5% accuracy without calibration |
| Capacitor-programmable POR delay | Enables precise power-supply sequencing with external CRES (e.g., 15nF → 45ms timeout) |
| 13μA quiescent current | Supports >1-year battery life in always-on keep-alive applications (e.g., telematics timers) |
| Parallel supply capability | Allows co-location with higher-current regulators (e.g., MAX1745) for low-IQ core bias during MCU sleep |
| Thermal fault recovery | Auto-restarts after 15°C cooldown post-shutdown; enables robust operation in sealed enclosures |
Applications
| Automotive Telematics Keep-Alive | Industrial Microcontroller Sleep Mode |
|---|---|
Use Scenario: Maintaining real-time clock and CAN wake-up logic in vehicle infotainment ECUs during ignition-off periods. IC Role / Device Role / Timing Role: Low-quiescent 1.5V supply for MCU interrupt controller and RTC backup domain. Use Value: Draws only 13μA while sustaining critical functions-enabling >3-year battery-backed operation without parasitic drain. |
Use Scenario: Powering the core voltage domain of an ARM Cortex-M7 microcontroller during deep-sleep states in factory automation PLCs. IC Role / Device Role / Timing Role: Parallel low-IQ regulator supplementing main 1.2V core supply to maintain register retention and wake-up readiness. Use Value: Enables sub-20μA system sleep current while preserving full interrupt latency and state integrity. |
| SDRAM Memory Retention Supply | Handheld Device Backup Timer |
Use Scenario: Providing stable 1.5V bias to DDR3L SDRAM I/O banks during system suspend in portable medical monitors. IC Role / Device Role / Timing Role: Always-on voltage source ensuring data retention in volatile memory during power cycling. Use Value: Delivers 100mA with <0.1mV/mA load regulation-preventing bit errors during extended suspend intervals. |
Use Scenario: Driving a low-power 32.768kHz oscillator and watchdog timer in battery-powered handheld test equipment. IC Role / Device Role / Timing Role: Precision 1.5V reference supply for timing circuitry with programmable reset assertion on brownout. Use Value: Adjustable CRES-based POR delay guarantees clean startup sequencing after battery insertion or recharge. |
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 |
|---|---|---|---|
| MAX1725AUK15+T | Fixed 1.5V output, 12μA IQ, but no RESET/CRES functionality; 6-pin SOT23 package | Lacks power-on-reset and POR delay-requires external supervisor IC for sequencing | Select when board space is constrained and reset logic is handled elsewhere |
| TLD1115EL | 1.5V output, 25μA IQ, integrated watchdog timer, AEC-Q100 qualified, TO-252 package | Higher IQ and larger footprint; adds watchdog but lacks CRES-programmable timeout flexibility | Select for automotive ASIL-B systems requiring certified watchdog and extended temperature validation |
Compared with MAX16999AUA15+, MAX1725AUK15+T saves board area but forfeits integrated POR control, while TLD1115EL adds functional safety features at the cost of quiescent current and design flexibility in timeout tuning.
Availability
MAX16999AUA15+ is available at Aetrix Electronics and suitable for automotive telematics, industrial microcontroller sleep management, and SDRAM retention supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16999AUA15+ 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX16999 belongs to Maxim's high-temperature linear regulator product line, engineered specifically for reliable low-IQ operation in automotive under-hood and industrial control environments where thermal resilience and precise power sequencing are critical.
FAQ
What is the exact output voltage of MAX16999AUA15+ and how is it set?
The MAX16999AUA15+ delivers a factory-trimmed, fixed 1.5V output voltage. This value is laser-trimmed during production and does not require external resistors or configuration. The suffix "15" in the part number explicitly denotes the 1.5V variant per Maxim's Selector Guide, and output accuracy is guaranteed at ±2.5% over temperature (–40°C to +125°C) and load (1mA to 100mA). The MAX16999AUA15+ achieves this stability using an internal precision reference and error amplifier without feedback network dependencies.
How does the CRES pin function in MAX16999AUA15+ and what capacitor value sets a 45ms reset timeout?
In the MAX16999AUA15+, the CRES pin connects to an internal 10μA constant-current source that charges an external capacitor to determine power-on-reset timeout. Using the formula t = CCRES × 60 × 10³ (with CCRES in farads), a 15nF capacitor yields approximately 45ms. The MAX16999AUA15+ datasheet confirms this relationship in Figure 18 and specifies CRES voltage threshold at 600mV (typ). This programmable delay enables precise coordination with upstream power rails or microcontroller boot sequences without additional ICs.
Does MAX16999AUA15+ support parallel operation with other regulators, and what design considerations apply?
Yes, the MAX16999AUA15+ is explicitly designed for parallel operation with equal-voltage supplies, as documented in Figure 2 and Applications Information. When used alongside a higher-current regulator (e.g., MAX1745), the MAX16999AUA15+ provides low-quiescent bias during MCU sleep while the main supply handles active loads. Key design rules include matching output voltages within ±1%, using separate input/output capacitors, and ensuring thermal isolation to prevent current hogging. The MAX16999AUA15+'s low dropout and tight load regulation support stable sharing.
What protection features are integrated into MAX16999AUA15+ and how do they behave under fault conditions?
The MAX16999AUA15+ integrates short-circuit protection (150mA typical current limit), thermal-overload shutdown (+165°C trip with 15°C hysteresis), and undervoltage lockout (2.2V threshold). During output short, the MAX16999AUA15+ limits current continuously without damage. In thermal fault, it cycles ON/OFF until junction cools by 15°C. UVLO forces OUT high-impedance if VIN drops below 2.2V-ignoring EN state. All protections are fully specified across –40°C to +125°C and require no external components.
Is MAX16999AUA15+ qualified for automotive applications and what package-related certifications does it hold?
The MAX16999AUA15+ is not AEC-Q100 qualified-the datasheet Revision 1 explicitly removed automotive qualification references. However, it operates across –40°C to +125°C ambient and supports automotive-adjacent use cases like telematics keep-alive due to its high-temperature reliability and Pb-free/RoHS-compliant μMAX-EP package (U8E+2 outline). Its exposed pad enhances thermal performance on multilayer boards, and the + suffix confirms RoHS compliance per Maxim's packaging standards. For certified automotive deployment, alternatives like TLD1115EL should be considered.
MAX16999AUA15+ 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:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- 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
MAX16999AUA15+ FAQ
1.How can I place an order for MAX16999AUA15+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16999AUA15+ 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 MAX16999AUA15+ reliable?
The price and inventory of MAX16999AUA15+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16999AUA15+ is usually 5 days.
3.What payment methods are accepted for MAX16999AUA15+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16999AUA15+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16999AUA15+?
MAX16999AUA15+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16999AUA15+ 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 MAX16999AUA15+?
For technical support, including MAX16999AUA15+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16999AUA15+ requirements.
6.How does Aetrix verify that MAX16999AUA15+ is sourced from the original manufacturer or authorized distributors?
All MAX16999AUA15+ 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 MAX16999AUA15+ meets industry standards.
7.What is the process for return or replacement of MAX16999AUA15+?
All MAX16999AUA15+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16999AUA15+, 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 MAX16999AUA15+ part is unused and in its original packaging.
Return procedure for MAX16999AUA15+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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