Nano Pulse ControlTM 3.5 V to 40 V Input, 2 A Single 2.2 MHz Buck DC/DC Converter For Automotive BD9P2x5MUF-C Series General Description BD9P2x5MUF-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 BD9P205MUF-C: 0.8 V to 8.5 V BD9P235MUF-C: 3.3 V (Typ) BD9P255MUF-C: 5.0 V (Typ)  Output Current: OCP_SEL = H 1.5 A (Max) OCP_SEL = L 2.0 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 (BD9P235MUF-C, BD9P255MUF-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

BD9P2x5MUF-C Series Typical Application Circuit - continued CBST RRST VMODE Figure 2. Application Circuit without Discharge Function (BD9P235MUF-C, BD9P255MUF-C) VMODE VSSCG Figure 3. Application Circuit (BD9P205MUF-C) Note: The difference between BD9P205MUF-C, BD9P235MUF-C and BD9P255MUF-C The VOUT_DIS pin and discharge function are not available with BD9P205MUF-C. The FB pin is assigned on the BD9P205MUF-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 BD9P235MUF-C and BD9P255MUF-C,...

(TOP VIEW) Figure 6. Pin Configuration (BD9P205MUF-C) www.rohm.com © 2019 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001

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...

BD9P2x5MUF-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 (BD9P205MUF-C) www.rohm.com © 2019 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001

BD9P2x5MUF-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 (BD9P235MUF-C, BD9P255MUF-C) www.rohm.com © 2019 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001

BD9P2x5MUF-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...

BD9P2x5MUF-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 %...

BD9P2x5MUF-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...

BD9P2x5MUF-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...