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Analog Devices Inc./Maxim Integrated MAX5097AAUP+
- Part No.:
- MAX5097AAUP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX5097AAUP+.pdf
- Description:
- IC REG BUCK ADJ/1.24V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:222
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Product details
Overview
MAX5097AAUP+ from Maxim Integrated is a dual-mode 40V, 600mA buck converter with integrated low-quiescent-current LDO mode, operating from 5V–40V (buck) or 4V–40V (LDO), delivering up to 600mA in buck mode and 100mA in LDO mode, with 330kHz fixed switching frequency and 41μA typical quiescent current at 100μA load - used in automotive body control modules for battery-supplied always-on subsystems.
For engineers reviewing the MAX5097AAUP+ datasheet, MAX5097AAUP+ pinout, MAX5097AAUP+ application, or MAX5097AAUP+ equivalent, key selection considerations include its Dual Mode™ operation, automotive-grade -40°C to +125°C temperature range, thermally enhanced 20-pin TSSOP-EP package, and integrated power-on-reset with programmable timeout.
Technical Context
The MAX5097AAUP+ implements a current-mode PWM buck architecture with an internal 0.9Ω p-channel high-side switch and supports external synchronization from 300kHz to 500kHz. Its Dual Mode™ operation uses separate error amplifiers and compensation schemes for buck and LDO modes, sharing only the pass element and reference.
Mode transition is controlled via the LDO/BUCK pin: a rising edge initiates LDO mode after 100μs delay, while a falling edge triggers buck mode after 32 clock periods. The device integrates a 4V internal BP regulator, programmable soft-start (via SS capacitor), and open-drain RESET output with adjustable timeout (via CT capacitor).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (Buck) | +5V to +40V - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Input Voltage Range (LDO) | +4V to +40V - enables regulation down to near-battery-dead voltage while maintaining ultra-low IQ. |
| Max Output Current | 600mA (buck), 100mA (LDO) - defines usable load capacity per mode; LDO current limited by thermal dissipation in TSSOP package. |
| Switching Frequency | 330kHz (fixed) - enables compact magnetics; higher than MAX5096's 135kHz for reduced inductor size/cost. |
| Quiescent Current (LDO) | 41μA (typ) at 100μA load - critical for key-off battery drain budgets in automotive infotainment and telematics. |
| Shutdown Current | 6μA (typ) - ensures minimal standby leakage when EN is pulled low. |
| Thermal Shutdown | +165°C with 20°C hysteresis - provides robust protection during sustained overload or poor PCB heatsinking. |
Pinout & Package
MAX5097AAUP+ is housed in a thermally enhanced 20-pin TSSOP-EP package with exposed pad (EP) connected to SGND for improved heat dissipation (θJA = 46.0°C/W, θJC = 2.0°C/W). The package supports 1.7W continuous power dissipation at TA = +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 15, 16 | IN | Regulator input; accepts 4V–40V; requires parallel ceramic + aluminum bypass capacitors for ripple handling. |
| 4 | PGND | Power ground return for high-side switch and freewheeling diode; must be low-inductance connection to input/output caps. |
| 5 | SGND | Signal ground; tied to PGND near input cap return to minimize noise coupling into feedback and control circuits. |
| 6 | RESET | Open-drain active-low reset output; asserts when VOUT drops below 90% of nominal; timeout set by CT capacitor. |
| 7 | BP | 4V internal regulator output; powers internal circuitry; bypassed with ≥1μF ceramic cap close to pin. |
| 8 | SYNC | Synchronization input; accepts external clock 300kHz–500kHz; grounded when unused. |
| 9 | SS | Soft-start timer input; controls monotonic output ramp-up time via external capacitor to SGND. |
| 10 | CT | Reset timeout period setting; capacitor value determines RESET assertion duration after power-up or brownout. |
| 11 | COMP | Buck-mode loop compensation node; connects external RC network for stable current-mode control. |
| 12 | LDO/BUCK | Mode select input; high (>2V) forces LDO mode; low (<0.8V) selects buck mode; transitions occur on-edge with defined delays. |
| 13 | ADJ | Feedback reference point; tied to SGND for fixed 5V output (MAX5097B variant); used with resistor divider for adjustable 1.24V–11V outputs. |
| 14 | OUT | Regulated output; requires ≥22μF low-ESR capacitor to PGND for stability in both modes. |
| 17 | EN | Enable input; logic-high (>1.4V) enables regulator; internally pulldown (0.5μA) - unconnected = shutdown. |
| 18, 19, 20 | LX | Drain of internal p-channel high-side switch; connects to inductor; handles peak currents up to 1.9A. |
| 8, 14, 18 | N.C. | No connection; not internally bonded - must remain unconnected on PCB. |
| EP | Exposed Pad | Thermal pad; soldered to large SGND copper area for heat conduction; not electrically functional as ground path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Operation | Seamlessly switches between high-efficiency buck (≤85% at 400mA) and ultra-low-IQ LDO (41μA typ) based on load and LDO/BUCK pin state - eliminates need for discrete mode-switching circuitry. |
| Integrated Power-On Reset | Open-drain RESET with capacitor-programmable timeout (CCT) and precise 92% VOUT rising threshold - replaces external supervisor IC in automotive microcontroller power sequencing. |
| Programmable Soft-Start | Monotonic output ramp controlled by single SS capacitor (e.g., 0.047μF = ~11.5ms) - prevents inrush current-induced voltage droop on weak supplies. |
| Automotive Temperature Range | -40°C to +125°C operation with guaranteed performance - qualified for under-hood and cabin applications per AEC-Q100 stress test requirements. |
| Thermal Protection | Active thermal shutdown at +165°C with 20°C hysteresis and automatic soft-start recovery - prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Body Control Module (BCM) | Infotainment Power Supply |
|---|---|
|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in vehicle door modules and lighting controllers during key-off and ignition cycles. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing stable 5V rail; switches to LDO mode during sleep to meet <100μA system quiescent budget. Use Value: Eliminates need for separate LDO and buck ICs, reducing BOM count and PCB area while meeting ISO 16750-2 battery transient requirements. |
Use Scenario: Generating clean 3.3V supply for audio DSPs and display controllers in head units, where EMI sensitivity demands low-noise operation. IC Role / Device Role / Timing Role: Buck converter operating at 330kHz with external SYNC capability to avoid AM band interference; LDO mode used during display backlight off. Use Value: Enables frequency hopping around narrowband radio channels and reduces inductor size by >40% vs. 135kHz alternatives. |
| Telematics Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) Camera Module |
|
Use Scenario: Powering LTE modems and GNSS receivers requiring fast wake-up from deep-sleep states with minimal battery drain. IC Role / Device Role / Timing Role: Regulator delivering 5V at 600mA in buck mode during data transmission; transitions to LDO mode (<41μA IQ) during idle polling intervals. Use Value: Achieves sub-50μA average system current over duty-cycle, extending cellular backup battery life beyond 72 hours. |
Use Scenario: Supplying image sensor and ISP in rear-view or surround-view cameras mounted in hot environments (e.g., trunk lid). IC Role / Device Role / Timing Role: High-voltage input (up to 40V) buck regulator with thermal shutdown at +165°C and 46°C/W junction-to-ambient resistance. Use Value: Maintains regulated output without derating up to +105°C ambient, eliminating need for external thermal monitoring or fan control. |
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 |
|---|---|---|---|
| MAX5097BAUP+ | Fixed 3.3V output (vs. 5V for MAX5097AAUP+); identical pinout, package, and electrical specs otherwise. | Used where 3.3V logic rails dominate (e.g., MCU core supplies), avoiding external feedback resistors required for adjustable versions. | Select MAX5097BAUP+ when system requires factory-trimmed 3.3V output with same thermal and transient performance. |
| MAX5096AAUP+ | 135kHz switching frequency (vs. 330kHz); same pinout, package, and Dual Mode™ functionality; lower EMI fundamental but larger magnetics. | Preferred in AM radio-sensitive zones (e.g., dashboard audio systems) where third harmonic must stay below 450kHz. | Choose MAX5096AAUP+ when board layout constraints allow larger inductors and EMI compliance mandates sub-150kHz fundamentals. |
Compared with MAX5097BAUP+, MAX5097AAUP+ delivers 5V directly without feedback dividers; compared with MAX5096AAUP+, it achieves 2.4× higher switching frequency for smaller passive components - making MAX5097AAUP+ optimal for space-constrained, high-density automotive modules needing 5V rails.
Availability
MAX5097AAUP+ is available at Aetrix Electronics and suitable for automotive body electronics, infotainment power management, and telematics control units requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX5097AAUP+ 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 MAX5097AAUP+ belongs to Maxim's Dual Mode™ DC-DC converter family, engineered specifically for automotive subsystems requiring seamless transition between high-efficiency switching and ultra-low-power linear regulation.
FAQ
What is the difference between MAX5097AAUP+ and MAX5097BAUP+?
The MAX5097AAUP+ provides a fixed 5V output, while MAX5097BAUP+ delivers a fixed 3.3V output. Both share identical pinout, 20-pin TSSOP-EP package, 330kHz switching frequency, Dual Mode™ operation, and -40°C to +125°C temperature rating. No circuit redesign is needed when swapping between them - only the output voltage differs.
Can MAX5097AAUP+ operate from a 4.2V input in LDO mode?
Yes. The MAX5097AAUP+ supports LDO mode operation from +4V to +40V input. At VIN = 4.2V and VOUT = 5V, it operates in dropout with ΔVDO ≈ 0.37V (typ) at 100mA load - meaning it can regulate 5V output down to VIN ≈ 5.37V. Below that, output follows input minus dropout voltage.
How does the LDO/BUCK pin control mode transition timing?
The MAX5097AAUP+ transitions from buck to LDO mode within 100μs after LDO/BUCK rises above 2.0V, and from LDO to buck mode after 32 internal clock periods (~96μs at 330kHz) once LDO/BUCK falls below 0.8V. These delays ensure clean, glitch-free mode switching without output overshoot or undershoot.
Is external compensation required for LDO mode operation?
No. The MAX5097AAUP+ requires external compensation only in buck mode (via COMP pin). LDO mode uses an internal error amplifier with no external components needed - simplifying design and reducing bill-of-materials for low-power sleep-state operation.
What is the maximum continuous power dissipation for MAX5097AAUP+ in its TSSOP package?
The MAX5097AAUP+ in 20-pin TSSOP-EP dissipates up to 1.7W continuously at TA = +70°C, with thermal derating of 21.7mW/°C above that temperature. This assumes proper PCB layout with the exposed pad soldered to ≥1 in² of SGND copper area per JEDEC 51 standards.
MAX5097AAUP+ 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 (3.3V)
- 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
MAX5097AAUP+ FAQ
1.How can I place an order for MAX5097AAUP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5097AAUP+ 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 MAX5097AAUP+ reliable?
The price and inventory of MAX5097AAUP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5097AAUP+ is usually 5 days.
3.What payment methods are accepted for MAX5097AAUP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5097AAUP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5097AAUP+?
MAX5097AAUP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5097AAUP+ 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 MAX5097AAUP+?
For technical support, including MAX5097AAUP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5097AAUP+ requirements.
6.How does Aetrix verify that MAX5097AAUP+ is sourced from the original manufacturer or authorized distributors?
All MAX5097AAUP+ 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 MAX5097AAUP+ meets industry standards.
7.What is the process for return or replacement of MAX5097AAUP+?
All MAX5097AAUP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5097AAUP+, 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 MAX5097AAUP+ part is unused and in its original packaging.
Return procedure for MAX5097AAUP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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