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Analog Devices Inc./Maxim Integrated MAX20031BATMB/V+
- Part No.:
- MAX20031BATMB/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX20031BATMB/V+.pdf
- Description:
- IC REG BUCK-BOOST
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Product details
Overview
MAX20031BATMB/V+ from Maxim Integrated is an automotive-grade dual synchronous step-down controller with integrated preboost circuit and high-voltage 200mA LDO, designed for front-end power management in cold-crank and stop-start automotive systems. It delivers regulated 5V (Buck 1) and 3.3V (Buck 2) outputs, operates from 3.5V–42V input (down to 2V with preboost enabled), supports 2.2MHz switching, and achieves 17µA quiescent current with Buck 1 active - enabling crank-ready instrument cluster and head unit power supplies.
For engineers reviewing the MAX20031BATMB/V+ datasheet, MAX20031BATMB/V+ pinout, MAX20031BATMB/V+ application, or MAX20031BATMB/V+ equivalent, key selection criteria include its dual-phase 2.2MHz buck architecture, 180° phase shift, resistor-programmable frequency (220kHz–2.2MHz), spread-spectrum EMI reduction, and thermal performance in the 7mm × 7mm 48-pin TQFN package with exposed pad.
Technical Context
The MAX20031BATMB/V+ integrates three independent switching controllers: two out-of-phase (180°) current-mode synchronous buck controllers (Buck 1/2) and one synchronous boost controller (preboost), plus a standalone HV LDO. Its control architecture supports forced fixed-frequency PWM, skip mode for ultra-low IQ, and external synchronization via FSYNC pin - enabling optimized efficiency across load transients and battery voltage dips.
It features cycle-by-cycle current limiting on all channels, thermal shutdown at +170°C, overvoltage/undervoltage lockout, and PGOOD monitoring for both buck outputs. The preboost activates below ~6V input to maintain regulation of Buck 1/2 down to 2V VIN, while the LDO provides a stable 5V or factory-configured 3.3V output with <500mV dropout at 200mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V–42V normal operation; extends to 2V with preboost enabled - ensures continuous regulation during automotive cold-crank events. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable via FOSC pin - enables compact magnetics and AM-band interference avoidance. |
| Quiescent Current | 17µA with 3.3V Buck active; 65µA with all controllers enabled - meets OEM low-power standby requirements. |
| Buck Output Voltages | Fixed 5V (±1.5%) and 3.3V (±2.1%) or adjustable 1V–10V - supports MCU, SoC, and peripheral rail generation. |
| LDO Output | 5V or factory-set 3.3V, 200mA max, 250–500mV dropout - powers bias rails and low-noise analog circuits. |
| Operating Temperature | −40°C to +125°C ambient - qualified for under-hood automotive applications per AEC-Q100. |
| Package | 7mm × 7mm, 48-pin TQFN with exposed thermal pad - provides θJA = 23.3°C/W on 4-layer board for reliable thermal management. |
Pinout & Package
MAX20031BATMB/V+ is housed in a thermally enhanced 7mm × 7mm, 48-pin TQFN package (package code T4877+9C, outline 21-0144) with exposed pad (EP = GND). The pinout supports dual-buck, preboost, and LDO integration with dedicated gate drivers, current-sense inputs, feedback nodes, and power-good signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DL1, DL2, DL3 | Low-side MOSFET gate drivers | Drive n-channel MOSFETs with rail-to-rail swing (VPGND to VBIAS); support fast turn-off and precise dead-time control. |
| DH1, DH2, DH3 | High-side MOSFET gate drivers | Bootstrap-driven outputs (VLX to VBST); enable efficient high-side switching for buck and boost stages. |
| FB1, FB2, FB3, FB4 | Feedback inputs | Regulate 5V/3.3V buck outputs (1V reference), boost output (1.005V), and LDO (1.25V); support external resistor-divider programming. |
| CS1, CS2, CS3P/CS3N | Current-sense inputs | Enable cycle-by-cycle current limiting: differential for boost (CS3P–CS3N), single-ended for bucks (CS1/CS2 to OUT1/OUT2). |
| PGOOD1, PGOOD2 | Open-drain power-good indicators | Assert low during soft-start, fault, or >8% undervoltage; require external BIAS pull-up for logic-level signaling. |
| EN1–EN4 | Independent enable inputs | Active-high digital controls for Buck 1/2, preboost (EN3), and LDO (EN4); tolerate up to 42V input with internal clamping. |
| FOSC, FSYNC, SPS | Frequency and EMI control | FOSC sets switching frequency via resistor; FSYNC enables external sync; SPS enables/disables spread-spectrum modulation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2.2MHz out-of-phase buck controllers | Reduces input capacitance requirement by 50% and lowers RMS input ripple vs. in-phase operation. |
| Synchronous preboost controller | Maintains Buck 1/2 regulation down to 2V input - critical for ISO 16750-2 cold-crank compliance. |
| Resistor-programmable switching frequency | 220kHz–2.2MHz range allows optimization for size (high-f), efficiency (mid-f), or EMI (low-f). |
| Spread-spectrum modulation (SPS pin) | ±6% frequency dither reduces peak EMI by >10dB without affecting loop stability or transient response. |
| Thermally enhanced 48-pin TQFN | θJA = 23.3°C/W enables 2.96W continuous dissipation at +70°C - supports high-power density layouts. |
| Automotive-grade protection suite | Includes OVP/UVP, thermal shutdown (+170°C), short-circuit current limit, and ±100mA latch-up immunity. |
Applications
| Instrument Cluster Power Supply | Navigation Head Unit Front-End |
|---|---|
Use Scenario: Powers display driver ICs, microcontrollers, and CAN transceivers in digital instrument clusters subjected to 2V cold-crank and load-dump events. IC Role / Device Role / Timing Role: Primary front-end regulator delivering isolated 5V and 3.3V rails with PGOOD sequencing and preboost hold-up. Use Value: Eliminates need for external boost stage; maintains display functionality during engine start with <17µA IQ in standby. |
Use Scenario: Supplies SoC core, memory, audio codec, and touch controller in infotainment head units operating across −40°C to +125°C. IC Role / Device Role / Timing Role: Dual-buck controller with 180° phase shift and spread spectrum - minimizes conducted EMI near AM/FM radio bands. Use Value: Achieves <10mVpp output ripple at 2.2MHz; avoids costly shielding and filter redesign in space-constrained dash modules. |
| Distributed DC Power System | Engine Control Unit (ECU) Auxiliary Rail |
Use Scenario: Provides local 5V/3.3V rails for distributed sensors, actuators, and communication nodes in zonal E/E architectures. IC Role / Device Role / Timing Role: Centralized multi-output PMIC replacing discrete buck converters and LDOs - simplifies BOM and layout. Use Value: Reduces component count by ≥7 devices; supports flexible rail sequencing via independent EN1–EN4 control. |
Use Scenario: Generates clean 3.3V auxiliary supply for ECU safety monitors, watchdog timers, and non-volatile memory during cranking. IC Role / Device Role / Timing Role: HV LDO (INLDO pin) with 36V max input and <500mV dropout - powers critical functions when main 12V rail collapses. Use Value: Delivers uninterrupted 3.3V at 200mA even at 2.5V input - ensures fail-safe operation during ISO 16750-2 Pulse 4 test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail automotive power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20030BATMB/V+ | Same pinout, identical buck/boost/LDO architecture; differs only in EN3 threshold (0.95V vs. 1.8V logic-high for MAX20031) | Compatible in most designs; MAX20030 preferred where preboost enable uses analog threshold, MAX20031 where digital EN3 control is required | Select MAX20031BATMB/V+ when system requires robust 1.8V logic-compatible preboost enable; verify EN3 interface compatibility before substitution. |
| TPS65381A-Q1 | Triple buck + LDO, but no integrated preboost; max input 36V; 2.1MHz max switching frequency; higher IQ (25µA typical) | Lacks cold-crank capability below 4V; requires external boost for 2V operation; suited for less demanding start-stop systems | Choose TPS65381A-Q1 only if preboost is implemented externally or cold-crank down to 2V is not required. |
Compared with MAX20030BATMB/V+, the MAX20031BATMB/V+ offers higher EN3 logic threshold for noise-immune digital control, while versus TPS65381A-Q1 it delivers unique integrated preboost for true 2V cold-crank operation - making it the only option among the three that guarantees regulation through full ISO 16750-2 low-voltage profiles without external circuitry.
Availability
MAX20031BATMB/V+ is available at Aetrix Electronics and suitable for instrument cluster, navigation head unit, and distributed DC power system designs requiring stable component supply, AEC-Q100 qualification, and long-term automotive lifecycle support.
Supply support for MAX20031BATMB/V+ 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 leader specializing in high-performance analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX20031 is part of Maxim's automotive front-end power supply family, engineered specifically to replace discrete buck + boost + LDO solutions in crank-ready ECUs and infotainment systems - emphasizing ultra-low IQ, wide VIN, and integrated protection.
FAQ
What is the minimum input voltage supported by MAX20031BATMB/V+ during cold-crank conditions?
The MAX20031BATMB/V+ maintains regulation of its Buck 1 and Buck 2 outputs down to 2V input when the integrated preboost controller is enabled. This capability is validated per ISO 16750-2 cold-crank profile and confirmed in the datasheet's Electrical Characteristics table under "Supply Voltage Range (with preboost enabled)". The preboost activates automatically below ~6V VIN and sustains output regulation until VIN reaches 2V.
Does MAX20031BATMB/V+ support synchronization to an external clock source?
Yes, MAX20031BATMB/V+ supports external clock synchronization via the FSYNC pin. It accepts external clock frequencies from 250kHz to 2.6MHz depending on RFOSC setting, with a minimum pulse width of 150ns. The device synchronizes its internal switching frequency 1:1 to the external clock, enabling deterministic EMI reduction and multi-phase coordination in complex power systems.
What is the function of the TERM pin on MAX20031BATMB/V+?
The TERM pin on MAX20031BATMB/V+ serves as the ground switch for the preboost converter's feedback divider. When the preboost is disabled (EN3 low), TERM opens to disconnect the feedback network from ground, preventing leakage paths and ensuring accurate regulation when the boost is inactive. It must be connected to the bottom of the FB3 resistive divider and is not a general-purpose ground pin.
Can MAX20031BATMB/V+ generate adjustable output voltages for its buck regulators?
Yes, MAX20031BATMB/V+ supports adjustable buck outputs. By connecting FB1 or FB2 to a resistive divider between OUT1/OUT2 and PGND (instead of tying to BIAS), the output voltage can be set from 1V to 10V. The internal reference is 1.00V (typ) for both FB1 and FB2, and the datasheet provides equations and example resistor values for common target voltages including 1.2V, 1.8V, and 2.5V.
What thermal performance can be expected from MAX20031BATMB/V+ in a standard 4-layer PCB layout?
In a JEDEC-standard 4-layer board (2 oz copper, 1-inch² copper area under EP), MAX20031BATMB/V+ achieves θJA = 23.3°C/W and θJC = 1.0°C/W. At +70°C ambient, this allows 2.96W continuous power dissipation before derating begins. The exposed pad (EP) must be soldered to a solid ground plane, and thermal vias (≥9×0.3mm) are recommended to maximize heat transfer to inner layers and minimize junction temperature rise.
MAX20031BATMB/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX20031BATMB/V+ FAQ
1.How can I place an order for MAX20031BATMB/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20031BATMB/V+ 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 MAX20031BATMB/V+ reliable?
The price and inventory of MAX20031BATMB/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20031BATMB/V+ is usually 5 days.
3.What payment methods are accepted for MAX20031BATMB/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20031BATMB/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20031BATMB/V+?
MAX20031BATMB/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20031BATMB/V+ 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 MAX20031BATMB/V+?
For technical support, including MAX20031BATMB/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20031BATMB/V+ requirements.
6.How does Aetrix verify that MAX20031BATMB/V+ is sourced from the original manufacturer or authorized distributors?
All MAX20031BATMB/V+ 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 MAX20031BATMB/V+ meets industry standards.
7.What is the process for return or replacement of MAX20031BATMB/V+?
All MAX20031BATMB/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20031BATMB/V+, 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 MAX20031BATMB/V+ part is unused and in its original packaging.
Return procedure for MAX20031BATMB/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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