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Analog Devices Inc./Maxim Integrated MAX5091BASA+
- Part No.:
- MAX5091BASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MAX5091BASA+.pdf
- Description:
- IC REG LINEAR 3.3V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:246
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Product details
Overview
MAX5091BASA+ from Maxim Integrated is a high-voltage, low-quiescent-current linear regulator with integrated reset supervisor and power-fail comparator. It delivers a fixed +3.3V output at up to 100mA, operates from +5V to +28V input, withstands 40V transients, and features 45μA quiescent current at 100μA load. It is used in automotive body control modules requiring robust voltage regulation and system-level reset supervision.
For engineers reviewing the MAX5091BASA+ datasheet, MAX5091BASA+ pinout, MAX5091BASA+ application, or MAX5091BASA+ equivalent, key selection criteria include its 3.3V fixed output, 100mA delivery capability under wide-input conditions, programmable reset timeout via external capacitor, uncommitted sense comparator for power-fail detection, and SO-EP package thermal performance in -40°C to +125°C environments.
Technical Context
The MAX5091BASA+ integrates a PNP-based LDO pass element with internal feedback for precise +3.3V regulation, an active-low open-drain RESET output with adjustable timeout (via CT pin capacitor), and an independent SI/SO comparator with 1.15V typical sense threshold and 100mV hysteresis. All circuits remain functional across the full -40°C to +125°C automotive temperature range.
It implements thermal shutdown at +165°C (with 20°C hysteresis) and short-circuit protection enabling continuous operation at VS ≤ 16V. The EN pin provides TTL-compatible enable control with internal 3.6V pullup, allowing default-on operation when left floating, while reducing supply current to 17μA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +3.3V fixed, ±1% over -40°C to +125°C and 1mA–100mA load ensures stable MCU core supply without external resistors. |
| Input Voltage Range | +5V to +28V operating range, with 40V transient tolerance supports automotive load-dump immunity per ISO 7637-2. |
| Max Output Current | 100mA guaranteed output enables direct powering of microcontrollers, CAN transceivers, and sensor interfaces. |
| Quiescent Current | 45μA typical at 100μA load allows always-on operation in battery-backed systems with minimal standby drain. |
| Dropout Voltage | ≤500mV at 100mA ensures regulation down to VS = 3.8V, extending usable input range in brownout conditions. |
| Reset Threshold | 90% of VOUT (±4.5%) with 45mV typical hysteresis provides reliable power-on reset timing for 3.3V logic domains. |
| Sense Threshold | 1.15V ±60mV on SI pin enables accurate undervoltage detection of external rails or battery monitoring. |
Pinout & Package
MAX5091BASA+ is housed in an 8-pin SO-EP (Small Outline–Exposed Pad) package, thermally enhanced with exposed paddle soldered to PCB ground plane for θJA = 52°C/W and 1538mW max power dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS | Regulator Input Supply | Accepts +5V to +28V; withstands 40V transients; bypassed with 10μF capacitor to GND. |
| SI | Sense Comparator Noninverting Input | Monitors external voltage rail; triggers SO low when input falls below 1.15V threshold. |
| EN | Enable Control Input | TTL-compatible; internally pulled up to 3.6V; logic low disables regulator and reduces IQ to 17μA. |
| CT | Reset Timeout Capacitor Node | Connects to GND via capacitor to program reset pulse delay (e.g., 100nF → ~105ms typical). |
| GND | Power and Signal Ground | Reference for all circuitry; exposed paddle must be soldered to PCB ground for thermal performance. |
| RES | Active-Low Reset Output | Open-drain; requires external pullup to VOUT; asserts low during undervoltage, shutdown, or thermal fault. |
| SO | Sense Comparator Output | Open-drain; requires external pullup to VOUT; asserts low when SI drops below threshold or during fault. |
| VOUT | Regulated +3.3V Output | Fixed 3.3V output; stable with ≥10μF ceramic capacitor; delivers up to 100mA with low ESR. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range with Transient Tolerance | +5V to +28V operation and 40V transient rating enable use in 12V/24V automotive and industrial power buses. |
| Low Quiescent Current | 45μA typical IQ at light load extends battery life in always-on telematics and security sensors. |
| Programmable Reset Timeout | External CT capacitor sets reset pulse delay from microseconds to seconds-no internal oscillator trimming required. |
| Dual Fault Monitoring | Independent RES (output voltage) and SO (input/sense voltage) outputs allow simultaneous power-good and power-fail signaling. |
| Thermal & Short-Circuit Protection | Auto-recovering thermal shutdown (+165°C trip, +20°C hysteresis) and 260mA current limit prevent damage during overload. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and door-lock actuator drivers in vehicle body electronics. IC Role / Device Role / Timing Role: Primary 3.3V LDO regulator with integrated reset supervision and input voltage monitoring for system initialization and fault reporting. Use Value: Eliminates need for discrete reset IC and voltage monitor, reducing BOM count and PCB area while meeting AEC-Q100 Grade 0 thermal requirements. | Use Scenario: Providing regulated 3.3V supply to isolated digital I/O channels in modular industrial controllers. IC Role / Device Role / Timing Role: High-reliability local regulator with programmable reset and power-fail detection for field-side power domain supervision. Use Value: Enables deterministic startup sequencing and brownout response without external timing components or comparators. |
| Home Security Sensor Hub | Telecom Remote Terminal Unit |
Use Scenario: Powering motion sensors, smoke detectors, and wireless transceivers in battery- or PoE-powered security gateways. IC Role / Device Role / Timing Role: Always-on 3.3V regulator with ultra-low IQ and dual fault outputs for battery health monitoring and system wake-up coordination. Use Value: Supports >5-year battery life in standby while delivering fast, accurate reset assertion during mains failure or low-battery events. | Use Scenario: Regulating 3.3V for Ethernet PHY, management MCU, and optical interface in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Input-tolerant LDO with transient immunity and thermal resilience for harsh outdoor environments. Use Value: Maintains regulation during lightning-induced surges and ambient temperatures up to +125°C, ensuring uninterrupted network uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7B6733QPWPRQ1 | +3.3V fixed output, 150mA, 35μA IQ, but lacks uncommitted sense comparator and programmable reset timeout. | Requires external comparator for power-fail detection; reset timeout is fixed at 200ms. | Preferred where higher output current and lower IQ are critical, and sense functionality is implemented externally. |
| LM2936QMM-3.3/NOPB | +3.3V fixed output, 50mA, 15μA IQ, includes reset but no sense comparator; only 28V max input (no 40V transient rating). | Limited to lower-current applications; cannot replace MAX5091BASA+ in 100mA or load-dump–exposed designs. | Valid for cost-sensitive, low-power automotive modules where 50mA output and basic reset suffice. |
Compared with TPS7B6733QPWPRQ1 and LM2936QMM-3.3/NOPB, the MAX5091BASA+ uniquely combines 100mA delivery, 40V transient tolerance, programmable reset, and an independent sense comparator in a single SO-EP package-enabling compact, functionally complete power supervision without external components.
Availability
MAX5091BASA+ is available at Aetrix Electronics and suitable for automotive body control, industrial PLC I/O, and home security sensor hub applications requiring stable component supply, AEC-Q100–compatible thermal performance, and long-term production continuity.
Supply support for MAX5091BASA+ 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 is engineered for high-reliability power-supply supervision in harsh environments, integrating LDO regulation, reset generation, and voltage monitoring into a single automotive-grade device.
FAQ
What is the maximum input voltage the MAX5091BASA+ can withstand continuously?
The MAX5091BASA+ operates continuously from +5V to +28V input. It withstands up to +40V input transients for ≤1 second, making it suitable for automotive load-dump conditions per ISO 7637-2. Sustained operation above +28V risks permanent damage and violates absolute maximum ratings.
Does the MAX5091BASA+ require an external capacitor on the CT pin to function?
No-the MAX5091BASA+ functions without a CT capacitor. In that case, the reset timeout defaults to 35μs. However, connecting a capacitor (e.g., 100nF) between CT and GND programs a longer, user-defined reset pulse delay (e.g., ~105ms typical), which is essential for reliable microcontroller initialization timing.
Can the MAX5091BASA+ be used with a 3.3V input supply?
No-the MAX5091BASA+ requires a minimum input voltage of +5V for regulation. Its dropout voltage is ≤500mV at 100mA, so it needs at least ~3.8V to maintain +3.3V output-but the absolute minimum VS is +5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below +5V is not specified or guaranteed.
How is the sense comparator threshold set on the MAX5091BASA+?
The MAX5091BASA+ SI pin has a fixed internal reference of 1.15V (typical) with 100mV hysteresis. To monitor an external voltage (e.g., 12V battery), use a resistor divider (RH/RL) from that rail to SI, where RL connects to GND. The trip point follows VTRIP = VST × (1 + RH/RL), with VST ≈ 1.15V. RL should be 100kΩ–300kΩ for accuracy.
Is the exposed paddle (EP) on the MAX5091BASA+ electrically connected?
Yes-the exposed paddle on the MAX5091BASA+ SO-EP package is internally connected to GND. It must be soldered to a PCB ground plane to achieve specified thermal resistance (θJA = 52°C/W) and power dissipation (1538mW at +70°C). It is not intended as the sole electrical GND connection; standard pin 5 (GND) must also be connected.
MAX5091BASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- 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-SOIC-EP
MAX5091BASA+ FAQ
1.How can I place an order for MAX5091BASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5091BASA+ 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 MAX5091BASA+ reliable?
The price and inventory of MAX5091BASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5091BASA+ is usually 5 days.
3.What payment methods are accepted for MAX5091BASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5091BASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5091BASA+?
MAX5091BASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5091BASA+ 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 MAX5091BASA+?
For technical support, including MAX5091BASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5091BASA+ requirements.
6.How does Aetrix verify that MAX5091BASA+ is sourced from the original manufacturer or authorized distributors?
All MAX5091BASA+ 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 MAX5091BASA+ meets industry standards.
7.What is the process for return or replacement of MAX5091BASA+?
All MAX5091BASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5091BASA+, 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 MAX5091BASA+ part is unused and in its original packaging.
Return procedure for MAX5091BASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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