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Analog Devices Inc./Maxim Integrated MAX5097BAUP+
- Part No.:
- MAX5097BAUP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX5097BAUP+.pdf
- Description:
- IC REG BUCK ADJ/1.24V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,320
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Product details
Overview
MAX5097BAUP+ from Maxim Integrated is a dual-mode 40V, 600mA buck converter with integrated low-quiescent-current LDO regulator functionality. It operates as a high-efficiency PWM switcher (330kHz fixed frequency) under heavy load and transitions to LDO mode (<41μA IQ at 100μA load) during light-load or key-off conditions. Designed for automotive power systems, it delivers stable 5V output with ±1.2% initial accuracy and supports external synchronization, programmable soft-start, and integrated power-on-reset.
For engineers reviewing the MAX5097BAUP+ datasheet, MAX5097BAUP+ pinout, MAX5097BAUP+ application, or MAX5097BAUP+ equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal performance (–40°C to +125°C), and real-world selection guidance for dual-mode DC-DC conversion in battery-supervised systems.
Technical Context
The MAX5097BAUP+ implements current-mode PWM control in buck mode with an internal 0.9Ω p-channel high-side switch and supports external frequency synchronization from 300kHz to 500kHz. Its dual-mode architecture uses separate error amplifiers and compensation paths for buck and LDO operation, sharing only the pass element and reference.
LDO mode activation is controlled via the LDO/BUCK pin (logic-high threshold = 2.0V), with transition timing of 100μs to LDO and 32 clock periods to buck. The device integrates a 4V internal BP regulator (±7% accuracy), undervoltage lockout (3.65V rising, 0.2V hysteresis), and thermal shutdown at +165°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (Buck) | +5V to +40V - supports wide automotive battery range including cold-crank transients up to +45V absolute max. |
| Switching Frequency | Fixed 330kHz - enables compact magnetics (smaller inductor/capacitor) and places fundamental switching noise above AM band. |
| Max Output Current (Buck) | 600mA continuous - sufficient for microcontroller core rails, CAN transceivers, and sensor interfaces in automotive ECUs. |
| Quiescent Current (LDO) | 41μA typical at 100μA load - enables <100μA system standby current when paired with MCU-controlled LDO/BUCK pin assertion. |
| Output Voltage Accuracy | ±1.2% over –40°C to +125°C - ensures reliable logic-level compliance for 5V I/O domains without external trimming. |
| Thermal Shutdown Threshold | +165°C junction temperature - protects against sustained overload in sealed enclosures; 20°C hysteresis prevents thermal oscillation. |
| Reset Timeout Programmability | Capacitor-adjustable via CT pin - allows precise power-on sequencing alignment with downstream processors (e.g., Infineon AURIX™). |
Pinout & Package
MAX5097BAUP+ is housed in a thermally enhanced 20-pin TSSOP-EP package with exposed pad (EP) for improved heat dissipation (θJA = 46.0°C/W). The package supports 1.7W continuous power dissipation at TA = +70°C and is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 15,16,17) | Power input supply | Accepts +5V to +40V; requires parallel ceramic + aluminum bypass capacitors to handle ripple current; withstands +45V transient. |
| LX (Pins 13,14) | Switch node | Drain of internal p-channel MOSFET; connects to inductor; voltage swings from –1V to VIN + 0.3V; peak current rating 2A. |
| OUT (Pin 11) | Regulated output | Delivers fixed 5V (MAX5097B variant); requires ≥22μF low-ESR capacitor to PGND for stability in both buck and LDO modes. |
| ADJ (Pin 10) | Feedback reference point | Connected to SGND for fixed 5V output; senses 1.237V internal reference; bias current <100nA enables high-resistor-divider designs. |
| LDO/BUCK (Pin 9) | Mode select control | Logic-high (>2.0V) forces LDO mode; logic-low (<0.8V) enables buck mode; transitions occur within 100μs or 32 clock cycles respectively. |
| EN (Pin 12) | Enable input | Active-high enable with 1.4V threshold; internal 0.5μA pulldown ensures safe default-off state; withstands +40V for direct IN connection. |
| RESET (Pin 3) | Open-drain reset output | Asserts low when VOUT drops below 90% nominal; timeout programmable via CT capacitor; compatible with standard microprocessor reset inputs. |
| COMP (Pin 8) | Buck loop compensation | External RC network sets bandwidth and phase margin; not used in LDO mode; critical for stability with selected inductor/capacitor values. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode topology (Buck + LDO) | Eliminates need for separate standby LDO IC; reduces BOM count and PCB area while maintaining <41μA quiescent current during vehicle key-off. |
| Integrated power-on-reset (RESET) | Provides configurable reset timeout without external supervisor IC; simplifies system-level power sequencing for multi-rail MCUs. |
| Programmable soft-start (SS pin) | Prevents inrush current-induced voltage droop on shared battery rails; soft-start time set by single capacitor (e.g., 0.047μF = ~11.5ms). |
| External frequency synchronization (SYNC) | Enables EMI reduction via spread-spectrum or channel-hopping in noise-sensitive environments (e.g., infotainment power supplies). |
| Thermal and short-circuit protection | Self-protecting operation under fault conditions; thermal shutdown + hysteresis avoids latch-up; current limit active in both buck and LDO modes. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and door-lock actuator drivers from 12V battery with key-off current budget <100μA. IC Role / Device Role / Timing Role: Dual-mode regulator providing 5V main rail; switches to LDO mode during ignition-off to meet ISO 16750-2 quiescent current requirements. Use Value: Eliminates discrete LDO for standby, reducing component count by one and enabling guaranteed <41μA system sleep current. |
Use Scenario: Generating isolated 5V logic supply for digital I/O modules in harsh industrial environments with wide input voltage variation. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated 5V output; leverages 40V input range to tolerate 24VDC brownouts and surges per IEC 61000-4-5. Use Value: Maintains regulation down to 5V input (buck) and 4V (LDO), ensuring uninterrupted operation during line sags without external boost circuitry. |
| Automotive ADAS Camera Power | Medical Diagnostic Equipment |
Use Scenario: Supplying image sensor and ISP in rear-view camera module where EMI must avoid AM/FM bands and thermal headroom is limited. IC Role / Device Role / Timing Role: 330kHz buck converter with SYNC input; synchronized to system clock to shift switching harmonics away from sensitive RF bands. Use Value: Enables compliance with CISPR 25 Class 5 radiated emissions without added shielding or ferrites, reducing bill-of-materials cost. |
Use Scenario: Providing clean, sequenced 5V rail for FPGA-based signal processing in portable ultrasound devices requiring low-noise, long-battery-life operation. IC Role / Device Role / Timing Role: Dual-mode regulator with programmable RESET timeout and output tracking via SS pin for coordinated power-up of analog/digital subsystems. Use Value: Ensures deterministic boot sequence across multiple voltage domains while minimizing standby drain during battery-powered operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-mode DC-DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5165QPWPRQ1 | Single-mode buck-only (no LDO mode); 65V input; 150mA output; no integrated RESET or soft-start. | Suitable for higher-input-voltage applications but cannot replace MAX5097BAUP+ in key-off ultra-low-IQ scenarios. | Select only if system does not require sub-100μA standby current and operates above 40V input. |
| TPS62130A-Q1 | Single-mode buck-only; 3.0–17V input; 3A output; integrated power-good but no RESET timeout programming. | Higher current capability but narrower input range; lacks LDO fallback and programmable reset timing. | Choose when high-output-current (≥1A) is required and automotive key-off IQ is managed externally. |
Compared with LM5165QPWPRQ1 and TPS62130A-Q1, the MAX5097BAUP+ uniquely combines buck efficiency with true LDO-mode ultra-low quiescent current, integrated programmable RESET, and automotive-grade thermal robustness-making it the only option that satisfies simultaneous requirements for wide-input operation, key-off current compliance, and system-level power sequencing in safety-critical ECUs.
Availability
MAX5097BAUP+ is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, ADAS camera modules, and medical diagnostic equipment requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX5097BAUP+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for automotive, industrial, and communications markets.
The MAX5097BAUP+ belongs to Maxim's automotive-grade dual-mode DC-DC converter product line, engineered specifically to eliminate the need for separate buck and LDO regulators in battery-supervised systems while meeting stringent ISO 16750-2 quiescent current and AEC-Q100 reliability requirements.
FAQ
What is the difference between MAX5097BAUP+ and MAX5097AAUP+?
The MAX5097BAUP+ delivers a fixed 5V output, while the MAX5097AAUP+ provides a fixed 3.3V output. Both share identical dual-mode architecture, 330kHz switching frequency, 20-pin TSSOP-EP package, and –40°C to +125°C automotive temperature rating. The 'B' suffix denotes the 5V version; 'A' denotes 3.3V. Pin compatibility and layout are identical, enabling single-board design reuse with only output capacitor and feedback resistor changes.
Can MAX5097BAUP+ operate with input voltage below 5V?
Yes - in LDO mode, the MAX5097BAUP+ operates from +4V to +40V input. When the LDO/BUCK pin is driven high, the device regulates 5V output down to VIN = 4V (with dropout voltage ≤0.37V at 100mA). Below 4V, the internal UVLO (3.65V BP threshold) disables operation. This enables reliable startup during battery brownout events common in automotive stop-start systems.
How is the RESET timeout period configured on MAX5097BAUP+?
The RESET timeout period on MAX5097BAUP+ is set by connecting a capacitor (CCT) from the CT pin to SGND. Using the formula tRP = (1.237V / 1μA) × CCT, a 0.01μF capacitor yields ~12.4ms timeout. The MAX5097BAUP+ RESET asserts low when VOUT falls below 90% of nominal and releases after the timeout once VOUT rises above 92%. This behavior is identical in both buck and LDO modes.
Does MAX5097BAUP+ require external compensation in LDO mode?
No - the MAX5097BAUP+ does not require external compensation in LDO mode. The LDO path uses an internal error amplifier with fixed compensation optimized for stability with standard output capacitors (≥22μF low-ESR). External compensation via the COMP pin is required only in buck mode, where the network must be tailored to the selected inductor and output capacitor values per the datasheet guidelines.
What thermal derating applies to MAX5097BAUP+ at elevated ambient temperatures?
The MAX5097BAUP+ has a thermal derating factor of 21.7mW/°C above +70°C ambient (per JEDEC 51 on multilayer board). At TA = +100°C, maximum continuous power dissipation is reduced to 1739mW − (30°C × 21.7mW/°C) = 1088mW. This corresponds to ~218mA output current at 5V output (assuming 100% efficiency), necessitating careful thermal design in sealed enclosures or high-temperature under-hood locations.
MAX5097BAUP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.24V (5V)
- Voltage - Output (Max):
- 11V
- Current - Output:
- 600mA
- Frequency - Switching:
- 330kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
MAX5097BAUP+ FAQ
1.How can I place an order for MAX5097BAUP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5097BAUP+ 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 MAX5097BAUP+ reliable?
The price and inventory of MAX5097BAUP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5097BAUP+ is usually 5 days.
3.What payment methods are accepted for MAX5097BAUP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5097BAUP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5097BAUP+?
MAX5097BAUP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5097BAUP+ 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 MAX5097BAUP+?
For technical support, including MAX5097BAUP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5097BAUP+ requirements.
6.How does Aetrix verify that MAX5097BAUP+ is sourced from the original manufacturer or authorized distributors?
All MAX5097BAUP+ 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 MAX5097BAUP+ meets industry standards.
7.What is the process for return or replacement of MAX5097BAUP+?
All MAX5097BAUP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5097BAUP+, 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 MAX5097BAUP+ part is unused and in its original packaging.
Return procedure for MAX5097BAUP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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