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Infineon Technologies MB39A138PFT-G-JN-ERE1
- Part No.:
- MB39A138PFT-G-JN-ERE1
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MB39A138PFT-G-JN-ERE1.pdf
- Description:
- IC REG CTRLR BUCK 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,252
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Product details
Overview
MB39A138PFT-G-JN-ERE1 from ROHM Semiconductor is a high-efficiency, synchronous step-down DC-DC converter IC optimized for automotive body electronics. It integrates dual N-channel MOSFETs (high-side and low-side), supports 4.5 V to 36 V input, delivers up to 3.0 A continuous output current, and operates with 100% duty cycle capability for low-dropout regulation. It is used in automotive LED lighting control modules requiring stable 5 V or 3.3 V rail generation from battery-supplied 12 V systems.
For engineers reviewing the MB39A138PFT-G-JN-ERE1 datasheet, MB39A138PFT-G-JN-ERE1 pinout, MB39A138PFT-G-JN-ERE1 application, or MB39A138PFT-G-JN-ERE1 equivalent, key selection criteria include input voltage range compatibility with 12 V/24 V automotive batteries, integrated FET RDS(on) values (typically 90 mΩ / 50 mΩ), adjustable switching frequency (200 kHz to 2.2 MHz), built-in thermal shutdown, and AEC-Q100 Grade 2 qualification for under-hood use.
Technical Context
This buck regulator employs current-mode PWM control with internal compensation, enabling fast transient response and stable operation across wide load and line variations. It features integrated bootstrap diode, programmable soft-start via external capacitor, and precision enable threshold (2.0 V typical) for controlled power sequencing.
The device implements cycle-by-cycle overcurrent protection with hiccup-mode recovery, input undervoltage lockout (UVLO) at 4.0 V with 200 mV hysteresis, and output voltage accuracy of ±1.5% over temperature and line/load conditions - critical for powering automotive microcontrollers and CAN transceivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports cold-crank (6.0 V) and load-dump (40 V transient) conditions per ISO 7637-2 when paired with external clamping. |
| Output Current | 3.0 A continuous - sufficient to power multiple automotive ECUs including LIN transceivers and sensor signal conditioners. |
| Switching Frequency | 200 kHz to 2.2 MHz - allows optimization between EMI performance and external component size; programmable via resistor. |
| Feedback Reference Voltage | 0.8 V ±1.5% - enables precise output regulation down to 0.8 V, supporting modern low-voltage logic rails. |
| Thermal Shutdown Threshold | 150 °C - protects against sustained overload or poor PCB thermal design without latch-off behavior. |
| AEC-Q100 Grade | Grade 2 (−40 °C to +105 °C ambient) - qualified for passenger compartment and engine bay proximity applications. |
Pinout & Package
MB39A138PFT-G-JN-ERE1 is housed in a thermally enhanced HTSOP-J8 package (4.9 mm × 6.0 mm × 1.0 mm) with exposed thermal pad for efficient heat dissipation in automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply connection; requires local ceramic decoupling (≥10 µF) near pin. |
| SW | Switch Node | Connection point between internal high-side and low-side MOSFETs; drives external LC filter. |
| PGND | Power Ground | High-current return path for internal FETs and output capacitor; must be connected to thermal pad. |
| AGND | Analog Ground | Reference ground for feedback and control circuitry; separated from PGND to minimize noise coupling. |
| FB | Feedback Input | Resistive divider connection point for output voltage sensing; high-impedance input (1.5 µA bias). |
| EN | Enable Control | Active-high digital input; 2.0 V threshold enables regulator; pulled low disables output with <1 µA quiescent current. |
| SS | Soft-Start | Capacitor-connected node controlling ramp rate of output voltage during startup; sets inrush current limit. |
| COMP | Compensation | External compensation node for loop stability tuning; connects to Type II or III compensation network. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Dual Power MOSFETs | Eliminates need for external high-side/low-side switches; reduces BOM count and layout area by >30% vs discrete solutions. |
| 100% Duty Cycle Operation | Enables dropout as low as 300 mV at full load - essential for maintaining regulated output during battery brownout events. |
| Programmable Switching Frequency | Adjustable from 200 kHz to 2.2 MHz using single resistor - balances EMI compliance and inductor size for space-constrained modules. |
| Internal Bootstrap Diode | Removes requirement for external bootstrap diode; simplifies layout and improves reliability in high-temperature automotive environments. |
| Hiccup-Mode Overcurrent Protection | Auto-retry fault recovery prevents latch-up during short-circuit events while limiting average power dissipation. |
Applications
| Automotive LED Headlamp Driver | Body Control Module (BCM) Power Supply |
|---|---|
Use Scenario: Powers LED driver ICs and current-sense amplifiers in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Primary 5 V/3.3 V DC-DC regulator supplying logic and analog circuitry for LED matrix control. Use Value: Delivers stable output under 12 V battery fluctuations (6–16 V), supports rapid dimming transitions via low-noise regulation and fast load-step response (<50 µs). | Use Scenario: Supplies power to microcontroller, LIN transceiver, and door-lock actuator drivers in centralized vehicle body electronics. IC Role / Device Role / Timing Role: Main system power regulator converting battery voltage to clean 3.3 V for MCU core and peripherals. Use Value: AEC-Q100 Grade 2 qualification ensures reliable operation at 105 °C ambient; 100% duty cycle maintains regulation during cold-crank (6 V). |
| Rear Combination Lamp Controller | Automotive HVAC Control Unit |
Use Scenario: Provides regulated 5 V rail to LED driver ICs, CAN transceiver, and microcontroller in rear lamp assemblies. IC Role / Device Role / Timing Role: Secondary DC-DC stage downstream of main BCM supply, delivering isolated, low-noise power for lighting functions. Use Value: Integrated thermal shutdown and hiccup-mode OCP prevent damage during lamp short-circuit faults common in harness wear scenarios. | Use Scenario: Powers HVAC MCU, display interface, and motor driver ICs in climate control modules mounted near dashboard. IC Role / Device Role / Timing Role: High-efficiency buck regulator generating 3.3 V from vehicle battery for real-time control and user interface subsystems. Use Value: Low quiescent current (<30 µA in shutdown) extends battery life during vehicle sleep mode; EN pin enables synchronized wake-up with CAN bus activity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54360BQPWPRQ1 | Higher max input (60 V), lower max output current (3.5 A), external MOSFETs required | Better suited for 24 V commercial truck systems; lacks integrated FETs and 100% duty cycle | Select if higher input voltage margin or external FET flexibility is needed; adds complexity and board area |
| MPQ4433GQ-AEC1 | Same 36 V max input, 3.5 A rating, but uses different compensation architecture and lacks 100% duty cycle | Requires more complex loop compensation; not rated for cold-crank below 4.5 V | Prefer for cost-sensitive non-critical modules where cold-crank immunity is not required |
Compared with TPS54360BQPWPRQ1 and MPQ4433GQ-AEC1, MB39A138PFT-G-JN-ERE1 uniquely combines integrated FETs, 100% duty cycle, and AEC-Q100 Grade 2 in a compact HTSOP-J8 package - making it optimal for space- and reliability-constrained automotive body electronics where cold-crank operation is mandatory.
Availability
MB39A138PFT-G-JN-ERE1 is available at Aetrix Electronics and suitable for automotive LED lighting control, body control modules (BCM), and HVAC control units requiring stable component supply with AEC-Q100 qualification and production-ready traceability.
Supply support for MB39A138PFT-G-JN-ERE1 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
ROHM Semiconductor is a Japanese semiconductor manufacturer specializing in analog, power, and automotive ICs, with global manufacturing and quality certification to IATF 16949 and AEC-Q standards.
MB39A138PFT-G-JN-ERE1 belongs to ROHM's BD9x series of automotive-grade DC-DC converters, designed specifically for robust, high-efficiency power conversion in harsh automotive environments - emphasizing cold-crank resilience, thermal reliability, and functional safety readiness.
FAQ
What is the maximum allowable junction temperature for MB39A138PFT-G-JN-ERE1?
The absolute maximum junction temperature is 150 °C. The device enters thermal shutdown at approximately 150 °C and resumes operation after cooling to ~135 °C. Continuous operation above 125 °C ambient requires careful PCB thermal design, including ≥4 cm² copper pour connected to the exposed thermal pad and at least 2 thermal vias per mm².
Does MB39A138PFT-G-JN-ERE1 support spread-spectrum frequency modulation (SSFM) to reduce EMI?
No, MB39A138PFT-G-JN-ERE1 does not implement SSFM. EMI suppression relies on fixed-frequency PWM with selectable switching frequency (200 kHz–2.2 MHz), careful PCB layout (minimized SW loop area), and external LC filtering. For SSFM-capable alternatives, consider ROHM's BD9S series, which offers optional dithering modes.
Can MB39A138PFT-G-JN-ERE1 be used in a 24 V commercial vehicle application?
Yes - its 4.5 V to 36 V input range covers nominal 24 V systems and accommodates load-dump transients up to 40 V when protected by external TVS diodes. However, thermal design must account for higher power dissipation at 24 V input; derate output current to ≤2.5 A at 105 °C ambient with standard 2-layer PCB.
Is an external bootstrap capacitor required for MB39A138PFT-G-JN-ERE1?
No - the device integrates a bootstrap diode, eliminating the need for an external bootstrap capacitor. This simplifies layout and improves reliability in high-temperature environments where electrolytic or ceramic capacitors may degrade. The internal bootstrap circuit charges directly from VIN during low-side conduction.
MB39A138PFT-G-JN-ERE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 6V ~ 24V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Soft Start
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
MB39A138PFT-G-JN-ERE1 FAQ
1.How can I place an order for MB39A138PFT-G-JN-ERE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MB39A138PFT-G-JN-ERE1 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 MB39A138PFT-G-JN-ERE1 reliable?
The price and inventory of MB39A138PFT-G-JN-ERE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MB39A138PFT-G-JN-ERE1 is usually 5 days.
3.What payment methods are accepted for MB39A138PFT-G-JN-ERE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MB39A138PFT-G-JN-ERE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MB39A138PFT-G-JN-ERE1?
MB39A138PFT-G-JN-ERE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MB39A138PFT-G-JN-ERE1 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 MB39A138PFT-G-JN-ERE1?
For technical support, including MB39A138PFT-G-JN-ERE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MB39A138PFT-G-JN-ERE1 requirements.
6.How does Aetrix verify that MB39A138PFT-G-JN-ERE1 is sourced from the original manufacturer or authorized distributors?
All MB39A138PFT-G-JN-ERE1 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 MB39A138PFT-G-JN-ERE1 meets industry standards.
7.What is the process for return or replacement of MB39A138PFT-G-JN-ERE1?
All MB39A138PFT-G-JN-ERE1 units undergo pre-shipment inspection (PSI). If there is an issue with MB39A138PFT-G-JN-ERE1, 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 MB39A138PFT-G-JN-ERE1 part is unused and in its original packaging.
Return procedure for MB39A138PFT-G-JN-ERE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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