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Analog Devices Inc./Maxim Integrated MAX16999AUA09+
- Part No.:
- MAX16999AUA09+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX16999AUA09+.pdf
- Description:
- IC REG LINEAR 0.9V 100MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,084
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Product details
Overview
MAX16999AUA09+ from Maxim Integrated is a high-temperature ultra-low-quiescent-current linear regulator delivering 100mA at preset 0.9V output, operating from 2.5V to 5.5V input, with 13μA typical ground current and active-low open-drain reset for power-on sequencing in automotive microcontroller keep-alive circuits.
For engineers reviewing the MAX16999AUA09+ datasheet, MAX16999AUA09+ pinout, MAX16999AUA09+ application, or MAX16999AUA09+ equivalent, key selection criteria include its -40°C to +125°C operation, 8-pin μMAX-EP package with exposed pad, adjustable POR delay via CRES capacitor, logic-controlled enable, and thermal/short-circuit protection for always-on subsystems.
Technical Context
The MAX16999AUA09+ integrates a p-channel MOSFET pass transistor, precision error amplifier, and internal 0.825×VREF reference to regulate 0.9V output with ±2.5% accuracy across load (1mA–100mA) and temperature (-40°C to +125°C). Its POR timer uses a 10μA CRES pullup current charging an external capacitor to generate programmable reset timeout.
Undervoltage lockout activates below 2.2V (with 45mV hysteresis), disabling regulation regardless of EN state. Thermal shutdown triggers at +165°C (15°C hysteresis), and current limiting clamps output at 150mA (typ) during overload-both protections operate independently of enable control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.9V - matches low-voltage microcontroller core/interrupt rails requiring precise biasing. |
| Input Voltage Range | 2.5V to 5.5V - supports direct connection to automotive battery (via pre-regulator) or industrial 3.3V/5V rails. |
| Quiescent Current | 13μA typ - enables multi-year battery life in always-on telematics timers and keep-alive memory circuits. |
| Max Output Current | 100mA at TA = +125°C - sustains full load in high-temp engine bay or industrial control environments. |
| Droput Voltage | 35mV at 80mA, VOUT = 3.3V - ensures regulation even with marginal input headroom in low-voltage systems. |
| Reset Threshold | 82.5% of VOUT (typ) - provides robust undervoltage detection margin before system reset assertion. |
| Thermal Shutdown | +165°C with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
MAX16999AUA09+ is housed in an 8-pin μMAX® package with exposed thermal pad (U8E+2 outline), requiring solder connection of EP to PCB ground plane for optimal thermal performance (θJA = 77.6°C/W on multilayer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT | Regulated output node | Bypassed with 4.7µF ceramic capacitor; goes high-impedance when EN = low for zero-load isolation. |
| 3 - CRES | POR timing capacitor node | Charged by 10µA internal current source; sets reset timeout (e.g., 15nF → ~80ms) and enables fault-timer fallback. |
| 4 - RESET | Active-low open-drain reset flag | Pulled low when VOUT < 82.5% nominal; high-impedance during regulation or shutdown - interfaces directly with µC reset input. |
| 5 - GND | Power and signal reference | Must connect to large PCB ground plane and exposed paddle (EP) to minimize thermal resistance and noise coupling. |
| 6 - EN | Active-high enable control | Drives regulator ON/OFF; latched internally (120kΩ pullup/pulldown) to retain state if signal floats. |
| 7, 8 - IN | Input supply terminal | Accepts 2.5V–5.5V; bypassed with ≥1µF ceramic cap close to pins to suppress input ripple and transients. |
| EP - Exposed Pad | Thermal and electrical ground | Serves as primary heatsink; must be soldered to solid copper area for θJC = 4.8°C/W and reliable 100mA operation at +125°C. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 13μA typical - reduces standby power in battery-backed systems without sacrificing regulation speed or accuracy. |
| Adjustable power-on reset delay | Programmable via external CRES capacitor (e.g., 1nF–100nF yields ~5ms–500ms timeout) - eliminates need for discrete RC timing networks. |
| Parallel supply capability | Designed to operate alongside higher-current regulators at identical voltage - shares load while maintaining low-IQ sleep mode. |
| Robust fault protection | Integrated short-circuit, thermal-overload, and UVLO protection - eliminates requirement for external current-sense or thermal monitoring circuitry. |
| High-temperature operation | Guaranteed performance from -40°C to +125°C ambient - qualified for under-hood automotive and industrial motor control applications. |
Applications
| SDRAM Power Supplies | Keep-Alive Timers |
|---|---|
Use Scenario: Providing stable 0.9V bias to SDRAM I/O or termination circuits during system suspend. IC Role / Device Role / Timing Role: Low-noise, low-quiescent auxiliary supply maintaining memory interface readiness without waking main CPU. Use Value: Enables fast resume from deep sleep by preserving SDRAM state with <13μA overhead - avoids full memory reinitialization delay. | Use Scenario: Powering real-time clock (RTC) or watchdog timer ICs during microcontroller shutdown. IC Role / Device Role / Timing Role: Always-on voltage source sustaining timekeeping logic while host µC enters zero-power hibernation. Use Value: Guarantees uninterrupted time tracking with 0.9V ±2.5% accuracy across -40°C to +125°C - critical for telematics event logging. |
| Handheld/Portable Devices | Industrial Microcontroller Systems |
Use Scenario: Supplying interrupt controller or sensor interface logic in battery-powered handheld instruments. IC Role / Device Role / Timing Role: Ultra-low-IQ regulator powering wake-up peripherals during extended idle periods between measurements. Use Value: Extends single-cell Li-ion battery life by >30% versus standard LDOs - validated at 100mA load up to +125°C junction. | Use Scenario: Delivering core voltage to industrial PLC microcontrollers requiring continuous monitoring during mains power loss. IC Role / Device Role / Timing Role: Fault-tolerant backup regulator enabling brownout-safe operation and controlled shutdown sequencing. Use Value: Integrates POR reset with 82.5% threshold and 15nF-programmable timeout - ensures deterministic startup after power recovery. |
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 |
|---|---|---|---|
| TPS7A0509PDBVR | 0.9V fixed output, 200mA rating, 25μA IQ, SOT-23-5 package - higher current but larger quiescent draw and no integrated POR timer. | Lacks CRES-based reset timeout and thermal fault timer - requires external reset IC for sequencing-critical systems. | Select when higher output current is needed and external reset generation is acceptable. |
| NCP114AMX09T2G | 0.9V fixed output, 150mA rating, 22μA IQ, SOT-23-5 - no reset output or CRES pin; only basic enable/shutdown control. | No reset signaling or power-on delay adjustment - unsuitable for applications requiring coordinated system boot timing. | Choose for cost-sensitive, non-sequencing applications where only voltage regulation is required. |
Compared with TPS7A0509PDBVR and NCP114AMX09T2G, the MAX16999AUA09+ uniquely combines 0.9V regulation, 13μA IQ, integrated POR reset with capacitor-programmable timeout, and thermal/overcurrent protection in a thermally enhanced 8-pin μMAX package - making it the only option for high-reliability, high-temperature always-on subsystems requiring autonomous power sequencing.
Availability
MAX16999AUA09+ is available at Aetrix Electronics and suitable for automotive telematics, industrial microcontroller keep-alive circuits, and portable device SDRAM power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16999AUA09+ 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-temperature linear regulation in safety-critical subsystems - specifically engineered for always-on microcontroller cores, RTCs, and memory retention circuits where ultra-low quiescent current and autonomous power sequencing are mandatory.
FAQ
What is the exact output voltage of the MAX16999AUA09+ and how is it set?
The MAX16999AUA09+ delivers a factory-trimmed fixed output voltage of 0.9V. This value is encoded in the "09" suffix per the Selector Guide and achieved via internal laser trimming of the feedback divider - eliminating need for external resistors and ensuring ±2.5% accuracy over -40°C to +125°C and 1mA–100mA load range. The MAX16999AUA09+ does not support adjustable output.
How does the CRES pin function in the MAX16999AUA09+ and what capacitor value is recommended for standard reset timing?
The CRES pin on the MAX16999AUA09+ connects to an external capacitor that sets the power-on reset timeout duration. An internal 10μA current source charges this capacitor; when voltage reaches 600mV (typ), RESET transitions high-impedance. For the standard 80ms timeout cited in typical operating circuits, a 15nF ceramic capacitor is used - confirmed by the RESET Timeout vs. CRES Capacitance plot (toc18) and schematic examples. The MAX16999AUA09+ requires CRES to be bypassed to GND with X7R or better dielectric.
Does the MAX16999AUA09+ support parallel operation with other regulators, and what design considerations apply?
Yes, the MAX16999AUA09+ is explicitly designed for parallel operation with other regulators of equal output voltage, as documented in the Applications Information section and Figure 2. Key requirements include matching output voltages (±10mV), using low-ESR output capacitors (<30mΩ), and ensuring independent input decoupling. When paralleled, the MAX16999AUA09+ handles light-load/standby current while the companion regulator supplies peak loads - reducing overall system IQ. No external diode-orring is needed due to its high-impedance OUT state during shutdown.
What thermal performance can be expected from the MAX16999AUA09+ in a multilayer PCB layout?
In a multilayer PCB layout with proper EP grounding, the MAX16999AUA09+ achieves θJA = 77.6°C/W and θJC = 4.8°C/W. At 100mA load and 5V input, power dissipation is ~410mW, resulting in ~32°C junction-to-ambient rise - well within the +150°C max junction limit. Derating begins above +70°C ambient at 12.9mW/°C, allowing full 100mA operation up to +125°C ambient when EP is fully soldered to ≥1in² copper area. The MAX16999AUA09+ thermal data is measured per JEDEC JESD51-7.
Is the MAX16999AUA09+ compatible with automotive AEC-Q100 qualification, and what reliability testing supports its high-temperature use?
The MAX16999AUA09+ is specified for -40°C to +125°C operation and features thermal shutdown (+165°C), UVLO (2.2V threshold), and 100% production testing at +25°C with design-guaranteed limits across temperature - but it is not AEC-Q100 qualified. Revision History notes removal of AEC-100 references in 2014. Its reliability stems from BiCMOS process, 150°C max junction rating, and fault protections validated per Maxim's internal high-temp stress protocols - making it suitable for under-dash telematics and industrial controls, though not for safety-critical ASIL-B/C domains without additional system-level validation. The MAX16999AUA09+ datasheet confirms all parameters are guaranteed up to +125°C ambient.
MAX16999AUA09+ 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):
- 0.9V
- 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
MAX16999AUA09+ FAQ
1.How can I place an order for MAX16999AUA09+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16999AUA09+ 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 MAX16999AUA09+ reliable?
The price and inventory of MAX16999AUA09+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16999AUA09+ is usually 5 days.
3.What payment methods are accepted for MAX16999AUA09+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16999AUA09+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16999AUA09+?
MAX16999AUA09+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16999AUA09+ 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 MAX16999AUA09+?
For technical support, including MAX16999AUA09+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16999AUA09+ requirements.
6.How does Aetrix verify that MAX16999AUA09+ is sourced from the original manufacturer or authorized distributors?
All MAX16999AUA09+ 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 MAX16999AUA09+ meets industry standards.
7.What is the process for return or replacement of MAX16999AUA09+?
All MAX16999AUA09+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16999AUA09+, 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 MAX16999AUA09+ part is unused and in its original packaging.
Return procedure for MAX16999AUA09+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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