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Analog Devices Inc./Maxim Integrated MAX16999AUA33+
- Part No.:
- MAX16999AUA33+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX16999AUA33+.pdf
- Description:
- IC REG LINEAR 3.3V 100MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,804
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Product details
Overview
MAX16999AUA33+ from Maxim Integrated is a high-temperature ultra-low-quiescent-current linear regulator delivering 100mA at 3.3V output, operating from 2.5V–5.5V input with 13μA typical quiescent current and integrated active-low open-drain reset with programmable POR delay. It serves as a parallel low-IQ supply for microcontroller core/interrupt sections during sleep mode in telematics and industrial control systems.
For engineers reviewing the MAX16999AUA33+ datasheet, MAX16999AUA33+ pinout, MAX16999AUA33+ application, or MAX16999AUA33+ equivalent, key selection criteria include guaranteed operation to +125°C ambient, ±2.5% output voltage accuracy over load/temperature, thermal shutdown at +165°C, logic-controlled enable with latched state, and CRES-based reset timeout programmability.
Technical Context
The MAX16999AUA33+ implements a p-channel MOSFET pass transistor with internal feedback divider and precision error amplifier to regulate fixed 3.3V output. Its power-on-reset (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.
Thermal protection activates at +165°C junction temperature with 15°C hysteresis, while undervoltage lockout (UVLO) disables regulation below 2.2V input with 45mV hysteresis. The EN input features 120kΩ internal pullup/pulldown resistors and latching behavior to maintain state during signal loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V, factory-trimmed to ±2.5% accuracy across -40°C to +125°C |
| Max Output Current | 100mA continuous at TA = +125°C on multilayer PCB, limited by thermal design |
| Quiescent Current | 13μA typical at light load, enabling always-on operation without battery drain |
| Droput Voltage | 35mV typical at 80mA load and 3.3V output, supporting low VIN–VOUT margin designs |
| Reset Timeout Range | Programmable via CRES capacitor: 30ms to >500ms (e.g., 15nF → ~80ms) |
| Operating Temp Range | -40°C to +125°C ambient, with junction limit of +150°C and thermal shutdown at +165°C |
| PSRR @ 100kHz | 40dB, sufficient for filtering switching noise from adjacent DC/DC converters |
Pinout & Package
MAX16999AUA33+ is housed in an 8-pin μMAX® package with exposed pad (U8E+2 outline), requiring solder connection of EP to PCB ground plane for thermal management and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT | Regulated output | Bypassed to GND with 4.7µF ceramic capacitor; goes high-impedance when EN = low |
| 3 - CRES | POR timing node | Charged by 10µA internal current; sets RESET timeout via external capacitor value |
| 4 - RESET | Active-low open-drain flag | Pulled low when VOUT < 82.5% nominal; high-impedance during regulation or shutdown |
| 5 - GND | Power and signal reference | Must connect directly to large ground plane and exposed paddle (EP) |
| 6 - EN | Logic-enable input | Active-high; latched internally with 120kΩ pullup; drives OUT high-Z when low |
| 7, 8 - IN | Input supply | Bypassed to GND with ≥1µF ceramic capacitor; UVLO threshold 2.2V max |
| EP - Exposed Paddle | Thermal & electrical ground | Required connection to PCB ground plane for thermal dissipation and noise reduction |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 13μA typical enables >10-year battery life in keep-alive timer applications |
| Programmable POR delay | External CRES capacitor allows precise power-sequence timing without firmware dependency |
| Thermal + short-circuit protection | Auto-recovering shutdown at +165°C and continuous short-to-GND tolerance prevent field failures |
| Logic-controlled enable with latch | EN retains last state during signal interruption, ensuring deterministic sleep/wake behavior |
| High-temp rated package | μMAX-EP package qualified for +125°C ambient operation with validated θJA = 77.6°C/W (multilayer) |
Applications
| Telematics Power Management | Industrial SDRAM Supply |
|---|---|
Use Scenario: Always-on GPS/GSM module in automotive infotainment requiring regulated 3.3V during vehicle ignition-off state. IC Role / Device Role / Timing Role: Parallel low-IQ supply powering MCU interrupt controller and RTC while main rail is off. Use Value: 13μA quiescent current prevents parasitic battery drain; reset timeout ensures clean boot after wake-up. | Use Scenario: Standby power for SDRAM I/O interface in industrial PLCs during CPU sleep cycles. IC Role / Device Role / Timing Role: Dedicated 3.3V rail maintaining memory retention and bus readiness independent of main system supply. Use Value: Fixed 3.3V output matches JEDEC SDRAM VDDQ spec; ±2.5% accuracy ensures timing margin compliance. |
| Keep-Alive Timer Supply | Handheld Device Core Bias |
Use Scenario: Precision real-time clock and watchdog timer in medical monitoring equipment requiring decade-level uptime. IC Role / Device Role / Timing Role: Primary bias source for timer IC during host MCU shutoff, with POR delay synchronized to system wake sequence. Use Value: CRES-programmable reset timeout eliminates need for external RC timing components and reduces BOM count. | Use Scenario: Low-noise core voltage for ARM Cortex-M microcontrollers in portable test instruments. IC Role / Device Role / Timing Role: Secondary 3.3V supply decoupling sensitive analog peripherals from noisy digital rails. Use Value: 40dB PSRR at 100kHz suppresses switching noise from adjacent buck converters, improving ADC SNR. |
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 |
|---|---|---|---|
| TPS7A0533PDBVR | 3.3V fixed, 200mA rating, 25μA IQ, SOT-23-5 package, no integrated reset | Lacks programmable POR and open-drain RESET; requires external supervisor for sequencing | Select when higher output current is needed and reset functionality is implemented elsewhere |
| NCP1117ST33T3G | 3.3V fixed, 1A rating, 6mA IQ, SOT-223 package, no enable or reset | Higher IQ limits battery life; no logic control or reset signaling; thermal shutdown only | Select for cost-sensitive industrial power rails where always-on operation is not required |
Compared with TPS7A0533PDBVR and NCP1117ST33T3G, the MAX16999AUA33+ uniquely combines ultra-low 13μA quiescent current, integrated programmable POR reset, and +125°C ambient operation-making it the only option for thermally constrained, battery-backed telematics and industrial keep-alive applications.
Availability
MAX16999AUA33+ is available at Aetrix Electronics and suitable for telematics modules, industrial SDRAM power supplies, and handheld device core biasing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX16999AUA33+ 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 subsystems in automotive telematics and industrial control where ultra-low quiescent current and guaranteed +125°C operation are mandatory.
FAQ
What is the guaranteed output voltage accuracy of the MAX16999AUA33+ over temperature and load?
The MAX16999AUA33+ guarantees ±2.5% output voltage accuracy across the full -40°C to +125°C operating temperature range and for load currents from 1mA to 100mA. This specification is production-tested at +25°C and ensured by design over temperature, making it suitable for precision biasing in automotive and industrial environments where thermal drift must be tightly controlled. The MAX16999AUA33+ achieves this via factory-trimmed internal feedback resistors and a stable bandgap reference.
How does the CRES pin function in the MAX16999AUA33+, and what capacitor value yields an 80ms reset timeout?
The CRES pin on the MAX16999AUA33+ sources a precise 10μA current to charge an external capacitor, generating a voltage ramp that triggers the RESET output to go high-impedance once it crosses 600mV. Using the formula t = C × 60 × 10³ (with C in farads), a 15nF capacitor yields approximately 80ms timeout. This allows designers to set exact power-on sequencing delays without firmware or additional components. The MAX16999AUA33+ also includes a 100ms fault timer to ensure reset assertion even if CRES shorts.
Can the MAX16999AUA33+ be used in parallel with another 3.3V supply, and what design considerations apply?
Yes, the MAX16999AUA33+ is explicitly designed for parallel operation with other 3.3V supplies-such as high-current DC/DC converters-to provide low-quiescent backup during sleep modes. Key considerations include matching output voltages within ±1%, using separate input/output capacitors per supply, and ensuring the MAX16999AUA33+'s EN pin is controlled independently to avoid backfeeding. The MAX16999AUA33+'s high output impedance when disabled prevents current contention, enabling seamless handoff between rails.
What thermal performance can be expected from the MAX16999AUA33+ on a standard multilayer PCB?
On a multilayer PCB, the MAX16999AUA33+ exhibits a junction-to-ambient thermal resistance (θJA) of 77.6°C/W and junction-to-case (θJC) of 4.8°C/W. With its exposed paddle (EP) soldered to a solid ground plane, it delivers 100mA continuously at +125°C ambient-verified in Table 1 of the datasheet. Derating begins above +70°C at 12.9mW/°C, allowing up to 1030.9mW at +70°C. This thermal capability makes the MAX16999AUA33+ suitable for enclosed industrial enclosures without forced airflow.
Does the MAX16999AUA33+ include undervoltage lockout, and what are its threshold and hysteresis values?
Yes, the MAX16999AUA33+ includes an undervoltage lockout (UVLO) circuit that disables regulation when input voltage falls below 2.2V (maximum threshold), with 45mV hysteresis to prevent oscillation near the trip point. UVLO activation forces OUT into high-impedance state regardless of EN pin state, ensuring clean power-down behavior. This feature protects downstream circuitry from brownout conditions and is fully specified across temperature. The MAX16999AUA33+ resumes regulation only after VIN rises above the UVLO threshold plus hysteresis.
MAX16999AUA33+ 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.1V @ 80mA
- 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
MAX16999AUA33+ FAQ
1.How can I place an order for MAX16999AUA33+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16999AUA33+ 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 MAX16999AUA33+ reliable?
The price and inventory of MAX16999AUA33+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16999AUA33+ is usually 5 days.
3.What payment methods are accepted for MAX16999AUA33+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16999AUA33+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16999AUA33+?
MAX16999AUA33+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16999AUA33+ 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 MAX16999AUA33+?
For technical support, including MAX16999AUA33+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16999AUA33+ requirements.
6.How does Aetrix verify that MAX16999AUA33+ is sourced from the original manufacturer or authorized distributors?
All MAX16999AUA33+ 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 MAX16999AUA33+ meets industry standards.
7.What is the process for return or replacement of MAX16999AUA33+?
All MAX16999AUA33+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16999AUA33+, 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 MAX16999AUA33+ part is unused and in its original packaging.
Return procedure for MAX16999AUA33+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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