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3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie

3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie

Product catalog summary

General Description: The BD9P1x5MUF-C Series is a current mode synchronous buck DC/DC converter designed for automotive applications, integrating POWER MOSFETs and featuring Nano Pulse ControlTM technology.

Features: Key features include AEC-Q100 qualification, a minimum ON pulse of 50 ns, soft start function, current mode control, reset function, light load mode, forced PWM mode, phase compensation, selectable spread spectrum switching, external synchronization, over current protection, under voltage lockout, thermal shutdown, output over voltage protection, and short circuit protection.

Applications: These converters are suitable for automotive and consumer powered supplies.

Key Specifications: The input voltage range is 3.5 V to 40 V, with an initial startup voltage of 4.0 V or more. The output voltage range varies by model: BD9P105MUF-C (0.8 V to 8.5 V), BD9P135MUF-C (3.3 V typical), and BD9P155MUF-C (5.0 V typical). The output current is up to 1.0 A, with a switching frequency of 2.2 MHz. The output voltage accuracy is ±1.75% over a temperature range of -40 °C to +125 °C.

Package: The package dimensions are 4.0 mm x 4.0 mm x 1.0 mm.

Typical Application Circuits: The document provides application circuits for different models, highlighting the differences in pin configurations and functionalities such as the discharge function and feedback pin usage.

Pin Configuration and Description: Detailed pin configurations are provided for each model, explaining the function of each pin, including power supply inputs, ground pins, switching node pins, and various control and protection pins.

Block Diagram and Description: The block diagrams illustrate the internal structure and operation of the converters, including key blocks like PreReg, VREG, TSD, VREF, POR, UVLO, MODE, OSC, OVP, SCP, and others. Each block's function is described, such as power supply regulation, thermal shutdown, reference voltage generation, and protection mechanisms.

Absolute Maximum Ratings: The document specifies the absolute maximum ratings for various parameters, including input voltage, enable voltage, BST voltage, and storage temperature range. It cautions against operating the IC beyond these limits to prevent damage.

Thermal Resistance: The document specifies thermal resistance parameters for the VQFN20FV4040 package, including junction-to-ambient (θJA) and junction-to-top characterization parameter (ΨJT). These values are based on different PCB configurations, with θJA being 120.0 °C/W for a single layer and 38.7 °C/W for a four-layer board.

Recommended Operating Conditions: The input voltage range is 3.5 to 40 V, with an operating temperature range from -40 to +125 °C. Output voltages vary by model: BD9P105MUF-C (0.8 to 8.5 V), BD9P135MUF-C (3.3 V), and BD9P155MUF-C (5.0 V). The output current is up to 1 A.

Electrical Characteristics: The document details various electrical parameters, including shutdown current, quiescent current, and power-on reset thresholds. It also covers VREG voltage, switching frequency, and feedback reference voltage for different models.

Typical Performance Curves: Graphs illustrate relationships between parameters such as shutdown current vs. input voltage, feedback reference voltage vs. temperature, and output voltage vs. temperature for different models.

Function Explanation: The document introduces Nano Pulse ControlTM, a technology by ROHM Co., Ltd., which allows stable voltage control even with narrow SW ON times, enabling direct conversion from high input to low output voltages.

Light Load Mode Control and Forced PWM Mode Control: The BD9P1x5MUF-C series uses current mode PWM control architecture for high transient response. Under heavy load, it operates in PWM mode at a fixed frequency. For lighter loads, it switches to Light Load Mode (LLM) to enhance efficiency. Forced PWM mode can be activated by applying a high voltage or external clock to the MODE pin, maintaining fixed frequency operation regardless of load.

Enable Control: The device can be shut down via the EN pin. When the EN pin voltage is high, the internal circuit activates. If the VOUT_DIS pin is connected to the output voltage and the EN pin is low, the output voltage discharges through a resistor.

Reset Function: The reset function monitors the FB pin voltage. When the output voltage reaches a certain threshold, the RESET pin's MOSFET turns off, allowing the RESET pin to go high. If the FB voltage drops below another threshold, the MOSFET turns on, pulling the RESET pin low.

External Synchronization Function: The switching frequency can be synchronized to an external clock signal applied to the MODE pin.

Frequency Division Function: This function manages the High Side FET's operation by skipping OFF pulses when input and output voltages are close.

Spread Spectrum Function: Activating the Spread Spectrum function reduces EMI noise by varying the switching frequency with a triangular wave.

VCC_EX Function: The VCC_EX function supplies power from VOUT to the internal VREG to improve efficiency.

Over Current Protection (OCP): The OCP monitors the average inductor current, with detection levels selectable via the OCP_SEL pin.

Short Circuit Protection (SCP): The SCP compares the FB pin voltage with an internal reference.

Power On Reset (POR)/Under Voltage Lockout Protection (UVLO): These functions prevent malfunction by monitoring VIN and VREG pin voltages.

Specifications: The document outlines the specifications for the BD9P1x5MUF-C Series, including input voltage range (3.5 V to 40 V), output voltage (5.0 V), output ripple voltage (20 mVp-p), output current (typical 0.5 A, maximum 1.0 A), switching frequency (2.2 MHz), and operating temperature range (-40 °C to +125 °C).

Protective Functions: The IC includes a thermal shutdown circuit that activates at 175 °C to prevent heat damage, turning off the power MOSFETs. It restarts at 150 °C with a soft start. Over Voltage Protection (OVP) monitors feedback voltage to prevent output voltage increase.

Component Selection: The document discusses the selection of inductors, output capacitors, input capacitors, and output voltage setting resistors, emphasizing the importance of ESR, capacitance, and ripple current ratings.

Design Considerations: The document emphasizes the importance of selecting components based on application requirements and highlights the need for proper PCB layout to ensure stable operation.

Overview: This document provides technical specifications, procedures, and application examples for the BD9P1x5MUF-C Series DC/DC converters by ROHM Co., Ltd.

Specifications: The document outlines the specifications for three different IC products: BD9P105MUF-C, BD9P135MUF-C, and BD9P155MUF-C.

Procedures: The document provides equations to maintain stable switching frequency and output voltage.

Application Examples: Three application examples are provided, each with a reference circuit and parts list.

Performance Characteristics: The document includes graphs and figures illustrating efficiency, input current, frequency characteristics, and response times under various conditions.

Recommendations: The document suggests using a π-type filter for improved EMI filtering and provides specific component recommendations.

Conclusion: The BD9P1x5MUF-C Series offers versatile solutions for DC/DC conversion with detailed guidance on component selection and circuit design.

Specifications and Components: The document discusses the use of TVS for primary protection in automotive power supply lines.

PCB Layout Design: The importance of PCB layout design for DC/DC converter power supply ICs is highlighted.

Power Dissipation: Guidelines for thermal design are provided.

Operational Notes: Several operational precautions are outlined.

Protection Circuits: The IC includes a thermal shutdown circuit and an overcurrent protection circuit.

Ordering Information: Details on part numbers and output voltage options are provided.

Packaging Specification: The document outlines the packaging specification for the BD9P1x5MUF-C series.

Part Numbers and Output Voltages: The document lists the following part numbers and their output voltages: BD9P105MUF-CE2 (Adjustable), BD9P135MUF-CE2 (3.3 V), and BD9P155MUF-CE2 (5.0 V).

Physical Dimensions and Packing Information: The package name is VQFN20FV4040.

Revision History: The document was first released on 28.Apr.2020 as Revision 001.

Precautions on Using ROHM Products: The document emphasizes consulting with ROHM for use in high-reliability applications.

Mounting and Circuit Board Design: Recommendations include using reflow soldering for surface-mount products.

Application Examples and External Circuits: Users are responsible for verifying application notes and reference designs.

General Precautions: Users should read and understand the document fully before using ROHM products.

Catalog excerpts

3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie-1

Nano Pulse ControlTM 3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Series General Description BD9P1x5MUF-C Series are current mode synchronous buck DC/DC converter integrating POWER MOSFETs.  Input Voltage Range: 3.5 V to 40 V (Initial startup is 4.0 V or more)  Output Voltage Range BD9P105MUF-C: 0.8 V to 8.5 V BD9P135MUF-C: 3.3 V (Typ) BD9P155MUF-C: 5.0 V (Typ)  Output Current: OCP_SEL = L 0.5 A (Max) OCP_SEL = H 1.0 A (Max)  Switching Frequency: 2.2 MHz (Typ)  Output Voltage Accuracy: ±1.75 % (-40 °C to +125 °C)  Shutdown Current: 2.1 μA (Typ)  Operating Temperature Range: -40 °C to +125 °C Nano Pulse ControlTM AEC-Q100 Qualified(Note 1) Minimum ON Pulse 50 ns (Max) Synchronous Buck DC/DC Converter Integrating POWER MOSFETs Soft Start Function Current Mode Control Reset Function Quiescent Current 10 μA (Typ) with 12 V Input to 5.0 V Output Light Load Mode (LLM) Forced Pulse Wide Modulation (PWM) Mode Phase Compensation Included Selectable Spread Spectrum Switching External Synchronization Function Selectable Over Current Protection (OCP) Input Under Voltage Lockout (UVLO) Protection Thermal Shut Down (TSD) Protection Output Over Voltage Protection (OVP) Short Circuit Protection (SCP) Enlarged View Automotive Powered Supplies Consumer Powered Supplies VQFN20FV4040 Wettable Flank Package Typical Application Circuit CBST Figure 1. Application Circuit with Discharge Function (BD9P135MUF-C, BD9P155MUF-C) Nano Pulse ControlTM is a trademark or a registered trademark of ROHM Co., Ltd. 〇Product structure : Silicon integrated circuit . www.rohm.com © 2019 ROHM Co., Ltd. All rights reserved. TSZ22111 • 14 • 001 〇This product has no designed protection against ra

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3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie-2

BD9P1x5MUF-C Series Typical Application Circuit - continued CBST RRST VMODE Figure 2. Application Circuit without Discharge Function (BD9P135MUF-C, BD9P155MUF-C) VMODE VSSCG Figure 3. Application Circuit (BD9P105MUF-C) Note: The difference between BD9P105MUF-C, BD9P135MUF-C and BD9P155MUF-C The VOUT_DIS pin and discharge function are not available with BD9P105MUF-C. The FB pin is assigned on the BD9P105MUF-C and the resistors dividing the output voltage are connected. The output voltage is defined by the resistors (RFB1, RFB2). The VOUT discharge function are available with BD9P135MUF-C and BD9P155MUF-C,...

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3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie-3

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3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie-4

www.rohm.com © 2019 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001 Function Power supply input pins that are used for the output stage of the switching regulator. Connect input ceramic capacitors referring Page 33 between the PGND pins and these pins. This pin is not connected to the chip. Use this as open. If this pin is used other than open and adjacent pins are expected to be shorted, please confirm if there is any problem with the actual application. Ground pins for the output stage of the switching regulator. Switching node pins. These pins are connected to the source of the internal...

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3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie-5

BD9P1x5MUF-C Series Block Diagram VREG tsdout OCP_SEL VREF HOCP Comp Soft Start Control Logic sleep VREF Current Sense Reset PGND VREF VOUT_SNS EN porout uvloout tsdout Figure 7. Block Diagram (BD9P105MUF-C) www.rohm.com © 2019 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001

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3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie-6

BD9P1x5MUF-C Series Block Diagram - continued VREG tsdout OCP_SEL VREF HOCP Comp Soft Start Control Logic sleep VREF Current Sense VREF Reset PGND VREF EN porout uvloout tsdout Figure 8. Block Diagram (BD9P135MUF-C, BD9P155MUF-C) www.rohm.com © 2019 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001

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3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie-7

BD9P1x5MUF-C Series Description of Blocks - PreReg This block is the internal power supply for TSD and VREF circuits. VREG This block is the internal power supply circuit. It outputs 3.3 V (Typ) and is the power supply to the control circuit and Driver. TSD This is the thermal shutdown circuit. It will shut down the device when the junction temperature (Tj) reaches to 175 °C (Typ) or more. When the Tj falls below the TSD threshold with hysteresis of 25 °C (Typ), the circuits are automatically restored to normal operation. VREF The VREF block generates the internal reference voltage. POR The POR...

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3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie-8

BD9P1x5MUF-C Series Description of Blocks - continued - PWM Comp This block compares the output voltage of the GmAmp2 (Vc) and the saw tooth waveform (Vr) to control the switching duty. Ramp This block generates the saw tooth waveform (Vr) from the clock signal generated by OSC. Control Logic This block controls switching operation and protection functions. Driver This circuit drives the gates of the output FETs. Sleep Comp If output/feedback voltage becomes 101.3 % (Typ) or more, this block puts the device into SLEEP state. This state is released when output/feedback voltage becomes 101.0 %...

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3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie-9

BD9P1x5MUF-C Series Absolute Maximum Ratings Parameter VVIN, VPVIN Input Voltage VOUT_DIS Voltage ΔVBST VFB, VRESET, VMODE, VSSCG VOCP_SEL VVOUT_DIS VOUT_SNS Voltage BST Voltage Voltage from SW to BST FB, RESET, MODE, SSCG, OCP_SEL Voltage VREG Voltage Storage Temperature Range Maximum Junction Temperature Human Body Model (HBM)(Note 1) VCC_EX Voltage Caution 1: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection...

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3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P1x5MUF-C Serie-10

BD9P1x5MUF-C Series Recommended Operating Conditions Parameter VVIN, VPVIN Input Voltage SW Minimum OFF Time (VREG = 3.3 V) SW Minimum OFF Time (VREG = 5.0 V) Operating Temperature Output Current Input Capacitor (VIN Continuous Condition) (Note 3) VREG Capacitor(Note 3) (Note 1) Although the output voltage is configurable at 0.8 V and higher, it may be limited by the SW min ON pulse width. For the same reason, although the output voltage is configurable at 8.5 V and more, it may be limited by the SW minimum OFF pulse width. For the configurable range, please refer to the Output Voltage Setting...

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