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Analog Devices Inc./Maxim Integrated MAX5091BATA+T
- Part No.:
- MAX5091BATA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX5091BATA+T.pdf
- Description:
- IC REG LINEAR 3.3V 100MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,279
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Product details
Overview
MAX5091BATA+T from Maxim Integrated is a high-voltage, low-quiescent-current linear regulator delivering a fixed +3.3V output at up to 100mA, with 50mV max dropout at 100mA, 45μA quiescent current at 100μA load, and integrated active-low open-drain RESET output programmable via external capacitor. It operates from +5V to +28V input, withstands 40V transients, and targets automotive power-supply supervision in engine control units.
For engineers reviewing the MAX5091BATA+T datasheet, MAX5091BATA+T pinout, MAX5091BATA+T application, or MAX5091BATA+T equivalent, this page delivers verified electrical parameters, thermal performance data, reset timing behavior, sense comparator thresholds, and package-specific derating curves - all confirmed for the TDFN-EP (3mm × 3mm) variant with exposed paddle.
Technical Context
The MAX5091BATA+T integrates a PNP-based LDO pass element with factory-trimmed feedback for precise +3.3V output, an always-on delay comparator (VCTTH = 2.1V typ) controlling RESET timeout, and a separate uncommitted comparator (VST = 1.15V typ, 100mV hysteresis) for SI/SO power-fail monitoring. Its internal 3.6V pre-regulator powers logic blocks independently of VOUT.
Thermal shutdown activates at TJ = +165°C (typ) with +20°C hysteresis, and current limiting holds output at ~260mA (typ) during overload. The device remains functional across -40°C to +125°C ambient, with junction-to-ambient thermal resistance θJA = 41°C/W (multilayer board), enabling operation under sustained 14V–28V automotive supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +3.3V ±1% (3.234V–3.366V) over full temp/load range - ensures stable MCU core voltage under battery variation. |
| Max Dropout Voltage | 500mV at 100mA load - enables regulation down to VS = 3.8V, critical for cold-crank automotive scenarios. |
| Quiescent Current | 45μA at 100μA load - supports always-on systems (e.g., CAN wake-up receivers) without draining battery. |
| RESET Threshold | 90% of VOUT (2.97V typ) with 45mV hysteresis - prevents false resets during brown-out recovery. |
| Input Transient Withstand | 40V for ≤1s - protects against ISO 7637-2 Pulse 5a load-dump events in 12V/24V vehicle systems. |
| Sense Threshold (SI) | 1.15V ±60mV - allows accurate power-fail detection using standard resistor dividers from VS. |
| Thermal Shutdown | +165°C activation with +20°C hysteresis - provides self-recovering fault protection during sustained overload. |
Pinout & Package
MAX5091BATA+T is housed in an 8-pin thermally enhanced TDFN-EP package (3mm × 3mm, 0.75mm height) with exposed paddle soldered to PCB ground for θJC = 8.3°C/W thermal path. Pin 1 (VS) accepts +5V to +28V input; Pin 8 (VOUT) delivers regulated +3.3V; Pin 6 (RES) and Pin 7 (SO) are open-drain outputs requiring external pull-up to VOUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VS | Regulator input supply | Accepts +5V to +28V; withstands 40V transients; bypass with 10μF ceramic to GND. |
| 2 - SI | Sense comparator noninverting input | Monitors external voltage divider; triggers SO low when input falls below 1.15V. |
| 3 - EN | Enable control input | TTL-compatible; internally pulled up to 3.6V; logic low disables regulator and reduces IQ to 17μA. |
| 4 - CT | Reset timeout capacitor node | Connects to GND via capacitor (e.g., 100nF → 105ms delay); pulled low during reset/shutdown. |
| 5 - GND | Power and signal ground | Reference for all circuits; must connect exposed paddle (EP) to large GND plane for thermal management. |
| 6 - RES | Active-low reset output | Open-drain; sinks ≥825μA at VRL ≤ 0.4V; asserts low until VOUT stabilizes and timeout expires. |
| 7 - SO | Active-low sense output | Open-drain; mirrors SI status; asserts low on power-fail or during EN low/thermal shutdown. |
| 8 - VOUT | Regulated output | +3.3V fixed; stable with 10μF ceramic capacitor; supplies microcontrollers, sensors, or interface ICs. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range with transient tolerance | +5V to +28V operating range + 40V/1s surge rating - eliminates need for upstream TVS in many automotive front-end designs. |
| Low-quiescent-current regulation | 45μA IQ at light load - extends battery life in always-on telematics modules without sacrificing startup speed. |
| Programmable reset timeout | Adjustable via CT capacitor (e.g., 10nF → 10ms, 100nF → 105ms) - enables system-specific power-up sequencing without firmware dependency. |
| Dual independent comparators | Separate RES (VOUT monitor) and SO (SI monitor) paths - supports simultaneous power-good and power-fail signaling for safety-critical diagnostics. |
| Robust fault protection | Short-circuit continuous protection at VS ≤ 16V + thermal shutdown with hysteresis - prevents latch-up during wiring faults or ESD-induced latch. |
Applications
| Engine Control Unit (ECU) Power Supervision | ADAS Camera Module Supply |
|---|---|
Use Scenario: Regulating +3.3V rail for microcontroller, CAN transceiver, and analog sensor interfaces in gasoline/diesel ECUs exposed to load dump and cold-crank. IC Role / Device Role / Timing Role: Primary LDO with integrated RESET and power-fail detection - replaces discrete supervisor + regulator combo. Use Value: Single-chip solution meets AEC-Q100 Grade 0 (-40°C to +125°C) requirements while reducing BOM count by 2–3 components. |
Use Scenario: Powering image signal processor (ISP) and serializer in 77GHz radar or surround-view camera modules requiring clean, monitored +3.3V. IC Role / Device Role / Timing Role: Low-noise, low-IQ LDO with programmable reset - ensures deterministic boot after power-on and detects brown-out during vibration-induced connector loss. Use Value: 45μA quiescent current enables >10-year battery-backed parking mode; 100mA output drives ISP core without external boost. |
| Telematics Control Unit (TCU) Always-On Rail | Industrial Gateway Power Management |
Use Scenario: Providing always-on +3.3V to GNSS receiver, cellular modem sleep controller, and secure element in fleet-tracking TCUs. IC Role / Device Role / Timing Role: Supervisor LDO with EN-controlled shutdown and SI-monitored backup power switchover - manages dual-supply (main/battery) handover. Use Value: Internal 3.6V pre-regulator maintains logic operation during VOUT dropout; SI comparator enables seamless transition to backup source. |
Use Scenario: Powering ARM Cortex-M7 microcontroller and Ethernet PHY in DIN-rail mounted industrial gateways operating in harsh 0–70°C enclosures. IC Role / Device Role / Timing Role: High-reliability LDO with thermal shutdown and short-circuit protection - sustains operation during ambient temperature spikes and field wiring errors. Use Value: θJA = 41°C/W (TDFN) enables 100mA delivery at +70°C ambient without heatsink; exposed paddle simplifies thermal design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5091AATA+T | Fixed +5V output; identical pinout, thermal specs, and feature set - differs only in output voltage trim. | Used where legacy 5V logic or mixed-voltage systems require both 3.3V and 5V rails. | Select MAX5091AATA+T only if system requires +5V output; MAX5091BATA+T is not substitutable due to output voltage mismatch. |
| TPS7B8733QKVURQ1 | Automotive-grade 3.3V LDO (150mA), 35μA IQ, but lacks integrated sense comparator and programmable reset - requires external supervisor IC. | Preferred in cost-sensitive designs where power-fail monitoring is handled separately or omitted. | Choose TPS7B8733QKVURQ1 when RESET timing is fixed and SI/SO functionality is unnecessary; MAX5091BATA+T adds integration value for diagnostic-rich systems. |
Compared with MAX5091AATA+T, MAX5091BATA+T provides identical robustness and supervision features at +3.3V, while TPS7B8733QKVURQ1 trades integrated comparators for lower IQ and higher output current - making MAX5091BATA+T optimal for space-constrained, function-integrated automotive power nodes.
Availability
MAX5091BATA+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, telematics control units, and industrial gateways requiring stable component supply with AEC-Q100-compliant performance and long-term lifecycle support.
Supply support for MAX5091BATA+T 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 automotive, industrial, and communications markets.
The MAX5091 series was developed specifically for high-reliability automotive power-supply supervision - integrating LDO regulation, reset generation, and power-fail detection into a single TDFN/SO package to reduce system-level complexity and improve fault coverage.
FAQ
What is the maximum input voltage the MAX5091BATA+T can withstand without damage?
The MAX5091BATA+T withstands up to +40V on the VS pin for durations ≤1 second, meeting ISO 7637-2 Pulse 5a load-dump immunity requirements. Continuous operation is rated from +5V to +28V. Exceeding +40V or applying >1s at 40V risks permanent damage per absolute maximum ratings. Derating is not required within these limits, and the device's internal protection circuitry remains fully functional during transient events.
How is the reset timeout period configured on the MAX5091BATA+T?
The reset timeout period on the MAX5091BATA+T is set by connecting an external capacitor between the CT pin and GND. Using the formula tRD ≈ 35μs + (CCT × 2.1V) / 2μA, a 100nF capacitor yields ~105ms typical delay. The MAX5091BATA+T's CT pin is actively driven low during reset, ensuring predictable discharge and repeatable timing across temperature. No external resistor is needed - only the capacitor defines the delay.
Does the MAX5091BATA+T support operation at -40°C ambient temperature?
Yes, the MAX5091BATA+T is fully specified and guaranteed over -40°C to +125°C ambient temperature, complying with AEC-Q100 Grade 0 requirements. All key parameters - including output voltage accuracy (±1%), dropout voltage, quiescent current (45μA typ), and reset threshold (90% VOUT) - are tested and characterized across this range. The TDFN-EP package's low θJA (41°C/W) ensures reliable thermal performance even at maximum ambient.
Can the MAX5091BATA+T be used with ceramic output capacitors?
Yes, the MAX5091BATA+T is stable with 10μF ceramic output capacitors (e.g., 0603 X5R/X7R), requiring no additional ESR. The datasheet confirms stability across temperature and load (1mA–100mA) with 10μF/low-ESR caps, eliminating the need for tantalum or aluminum electrolytic alternatives. For 100mA loads, ESR should be ≤66mΩ - easily achieved with standard 10μF/0603 ceramics.
What is the function of the SI and SO pins on the MAX5091BATA+T?
The SI (Sense Input) and SO (Sense Output) pins on the MAX5091BATA+T form an independent voltage-monitoring comparator. SI is the noninverting input with a 1.15V threshold; SO is an open-drain output that pulls low when SI voltage drops below threshold. This enables external power-fail detection (e.g., monitoring VS via resistor divider) without affecting the main regulator loop - a key feature for safety diagnostics in automotive systems using the MAX5091BATA+T.
MAX5091BATA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 10 mA
- PSRR:
- -
- Control Features:
- Enable, Reset
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (3x3)
MAX5091BATA+T FAQ
1.How can I place an order for MAX5091BATA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5091BATA+T 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 MAX5091BATA+T reliable?
The price and inventory of MAX5091BATA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5091BATA+T is usually 5 days.
3.What payment methods are accepted for MAX5091BATA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5091BATA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5091BATA+T?
MAX5091BATA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5091BATA+T 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 MAX5091BATA+T?
For technical support, including MAX5091BATA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5091BATA+T requirements.
6.How does Aetrix verify that MAX5091BATA+T is sourced from the original manufacturer or authorized distributors?
All MAX5091BATA+T 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 MAX5091BATA+T meets industry standards.
7.What is the process for return or replacement of MAX5091BATA+T?
All MAX5091BATA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5091BATA+T, 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 MAX5091BATA+T part is unused and in its original packaging.
Return procedure for MAX5091BATA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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