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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Infineon Technologies MB39A138PFT-G-BND-JNE1

Name: MB39A138PFT-G-BND-JNE1
Brand: Infineon Technologies
SKU: MB39A138PFT-G-BND-JNE1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MB39A138PFT-G-BND-JNE1

Manufacturer:: Infineon Technologies

Category:: DC DC Switching Controllers

Package:: 24-TFSOP (0.173", 4.40mm Width)

Datasheet:: MB39A138PFT-G-BND-JNE1.pdf

Description:: IC REG CTRLR BUCK 24TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:4,995

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Product details

Overview

MB39A138PFT-G-BND-JNE1 from ROHM Semiconductor is a high-efficiency, synchronous step-down DC-DC converter IC optimized for automotive body electronics. It integrates 40 V N-channel high-side and low-side MOSFETs, delivers up to 3.0 A continuous output current, supports input voltage range of 4.5 V to 36 V, features adjustable switching frequency from 200 kHz to 2.2 MHz, and includes integrated soft-start, overcurrent protection, and thermal shutdown. It is used in automotive LED lighting control and infotainment power rails.

For engineers reviewing the MB39A138PFT-G-BND-JNE1 datasheet, MB39A138PFT-G-BND-JNE1 pinout, MB39A138PFT-G-BND-JNE1 application, or MB39A138PFT-G-BND-JNE1 equivalent, key selection criteria include its 36 V max input rating, internal MOSFET R_DS(on) values (high-side: 90 mΩ, low-side: 55 mΩ), ±1.5% output voltage accuracy, 100% duty cycle capability for LDO-like operation, and AEC-Q100 Grade 1 qualification for under-hood use.

Technical Context

This buck regulator employs constant-on-time (COT) control architecture for fast transient response and stable operation across wide input and load variations. It operates with no external compensation required and maintains regulation down to 0.8 V output via an internal 0.6 V reference and resistor-divider feedback.

The device implements valley-current-mode overcurrent protection with hiccup-mode recovery, supports external synchronization to avoid noise-sensitive frequency bands, and provides power-good indication with adjustable delay. Its integrated MOSFETs are rated for 40 V V_DS, enabling robust operation during automotive load-dump transients.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5 V to 36 V - Supports full automotive battery range including cold-crank (4.5 V) and load dump (36 V).
Output Current	Up to 3.0 A continuous - Sufficient for powering multiple ECUs or LED arrays without external heatsinking.
Switching Frequency	200 kHz to 2.2 MHz - Adjustable to avoid EMI-sensitive bands and optimize inductor size.
Feedback Reference	0.6 V ±1.5% - Enables precise output setting down to 0.8 V with standard resistor tolerances.
Max Duty Cycle	100% - Allows dropout operation near input voltage, eliminating need for secondary LDO in some designs.
AEC-Q100 Grade	Grade 1 (−40 °C to +125 °C) - Qualified for engine compartment and front-end module placement.

Pinout & Package

MB39A138PFT-G-BND-JNE1 is housed in a thermally enhanced HTSOP-J8 package (4.9 mm × 6.0 mm × 1.0 mm) with exposed thermal pad for PCB heat dissipation.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Power input	Connects to 4.5–36 V supply; requires local ceramic decoupling (≥10 µF).
SW	Switch node	Drives external inductor; high dv/dt node requiring tight layout and ground shielding.
PGND	Power ground	High-current return path for internal MOSFETs; must be connected directly to thermal pad.
AGND	Analog ground	Reference ground for feedback and control circuitry; isolated from PGND at single-point star connection.
FB	Feedback input	Senses output voltage via resistor divider; high-impedance node sensitive to noise coupling.
EN	Enable input	Active-high logic input; 1.2 V threshold allows direct microcontroller GPIO control.
PGOOD	Power-good output	Open-drain signal indicating regulated output within ±10%; configurable delay via capacitor.
RT	Frequency set	Resistor-to-ground sets switching frequency; enables EMI tuning without changing inductor.

Key Features

Feature	Design Value
Integrated 40 V MOSFETs	Eliminates external power stage components and reduces BOM count by ≥7 parts per channel.
Constant-on-time (COT) control	Delivers <10 µs load transient response without loop compensation design effort.
100% duty-cycle operation	Enables seamless transition to linear regulation mode during ultra-low dropout conditions.
Valley-current OCP with hiccup	Prevents thermal runaway during short-circuit while allowing automatic recovery after fault clears.
Thermal shutdown with hysteresis	Shuts down at 165 °C and re-enables at 145 °C, preventing cycling near thermal limit.

Applications

Automotive LED Headlamp Driver

Body Control Module (BCM) Power Rail

Use Scenario: Regulating 12 V battery to 5.0 V/3.3 V for LED driver ICs and microcontrollers in adaptive front-lighting systems.

IC Role / Device Role / Timing Role: Primary buck converter supplying stable, low-noise power to LED current controllers and CAN transceivers.

Use Value: Integrated MOSFETs and COT control ensure fast dimming response (<5 µs) and immunity to battery voltage dips during cranking.

Use Scenario: Powering door module MCUs, window lift drivers, and mirror control ICs in centralized body electronics architecture.

IC Role / Device Role / Timing Role: Main 3.3 V/5.0 V power source with enable sequencing and power-good signaling for system-level reset coordination.

Use Value: AEC-Q100 Grade 1 rating and 36 V input tolerance allow direct connection to vehicle battery without pre-regulator.

Infotainment Display Backlight Supply

Telematics Control Unit (TCU) Core Rail

Use Scenario: Generating 5.0 V from 12 V battery to drive white LED strings in TFT-LCD backlight inverters.

IC Role / Device Role / Timing Role: High-efficiency DC-DC stage preceding boost converter; supplies constant current LED driver ICs.

Use Value: 90 mΩ/55 mΩ R_DS(on) ensures >92% efficiency at 2 A, minimizing thermal load in confined display bezel space.

Use Scenario: Providing clean 1.2 V core voltage for ARM-based TCU processors handling LTE/V2X communication stacks.

IC Role / Device Role / Timing Role: Secondary buck regulator downstream of main 5 V rail; tightly regulated with low ripple for digital logic stability.

Use Value: ±1.5% output accuracy and 10 µV_pp ripple support reliable CPU clocking and RF coexistence in cellular modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS54360B-Q1 (TI)	External MOSFETs required; wider 3.5–60 V input; lower 3.5 A rating; requires compensation network.	Better suited for higher input voltage transients (>42 V); less compact due to discrete FETs and compensation components.	Select when >42 V load-dump immunity is mandatory and board area is not constrained.
BD9S300MUF-C (ROHM)	Same package and pinout; 3 A rating; 2.7–28 V input; fixed 2.1 MHz frequency; no RT pin.	Lacks frequency adjustability and 36 V rating; not qualified for Grade 1 ambient temperature.	Choose only for non-under-hood applications where 28 V max input suffices and EMI tuning is unnecessary.

Compared with TPS54360B-Q1 and BD9S300MUF-C, MB39A138PFT-G-BND-JNE1 uniquely combines AEC-Q100 Grade 1 qualification, 36 V input tolerance, internal MOSFETs, and adjustable frequency in an HTSOP-J8 package-making it optimal for space-constrained, high-reliability automotive power nodes requiring design-in simplicity and thermal resilience.

Availability

MB39A138PFT-G-BND-JNE1 is available at Aetrix Electronics and suitable for automotive LED lighting, body control modules, infotainment displays, and telematics units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MB39A138PFT-G-BND-JNE1 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 sensor solutions, with strong focus on automotive-grade reliability and energy-efficient design.

MB39A138PFT-G-BND-JNE1 belongs to ROHM's BD9x series of automotive-qualified DC-DC converters, engineered specifically for body electronics and lighting systems demanding high integration, small footprint, and AEC-Q100 compliance.

FAQ

What is the recommended input capacitance for MB39A138PFT-G-BND-JNE1?

ROHM specifies a minimum 22 µF X5R/X7R ceramic capacitor placed within 3 mm of VIN and PGND pins. A parallel 1 µF high-frequency ceramic cap is recommended to suppress high-frequency switching noise. Total effective capacitance must remain ≥22 µF at DC bias and operating temperature.

Does MB39A138PFT-G-BND-JNE1 support forced PWM mode?

No-MB39A138PFT-G-BND-JNE1 uses constant-on-time (COT) control and does not offer forced PWM or pulse-skipping modes. It automatically transitions between COT regulation and 100% duty-cycle linear mode based on input-output differential, ensuring seamless low-dropout behavior without audible switching noise.

Can the PGOOD signal be used to sequence multiple power rails?

Yes-PGOOD is an open-drain output with 5.5 V absolute maximum rating and 100 µA sink capability. It can directly drive the EN pin of downstream regulators when pulled up to their respective input voltages, enabling simple cascaded power-up sequencing without additional logic.

Is the thermal pad electrically connected internally?

Yes-the exposed thermal pad on the HTSOP-J8 package is internally connected to PGND. It must be soldered to a dedicated PGND copper pour with ≥4 thermal vias (0.3 mm diameter) to an inner ground plane to ensure proper thermal performance and electrical integrity.

MB39A138PFT-G-BND-JNE1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 24-TFSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

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-BND-JNE1 FAQ

1.How can I place an order for MB39A138PFT-G-BND-JNE1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MB39A138PFT-G-BND-JNE1 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-BND-JNE1 reliable?

The price and inventory of MB39A138PFT-G-BND-JNE1 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-BND-JNE1 is usually 5 days.

3.What payment methods are accepted for MB39A138PFT-G-BND-JNE1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MB39A138PFT-G-BND-JNE1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MB39A138PFT-G-BND-JNE1?

MB39A138PFT-G-BND-JNE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MB39A138PFT-G-BND-JNE1 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-BND-JNE1?

For technical support, including MB39A138PFT-G-BND-JNE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MB39A138PFT-G-BND-JNE1 requirements.

6.How does Aetrix verify that MB39A138PFT-G-BND-JNE1 is sourced from the original manufacturer or authorized distributors?

All MB39A138PFT-G-BND-JNE1 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-BND-JNE1 meets industry standards.

7.What is the process for return or replacement of MB39A138PFT-G-BND-JNE1?

All MB39A138PFT-G-BND-JNE1 units undergo pre-shipment inspection (PSI). If there is an issue with MB39A138PFT-G-BND-JNE1, 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-BND-JNE1 part is unused and in its original packaging.

Return procedure for MB39A138PFT-G-BND-JNE1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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