A 7 to 60 V Input Buck Converter: A Wide-Range DC-DC Step-Down Module
This compact buck converter module accepts input voltages from 7 V to 60 V DC and steps them down to either 5.0 or 3.3 V. The output voltage is selectable via a jumper.
The heart of the design is the ROHM BD9G500UEFJ-LA, an 8-pin SMD buck converter IC with an integrated high-side power MOSFET featuring low on-resistance. The device operates in current-mode control and can supply continuous output currents up to 5 A, with a nominal rating of 2 A for typical use.
The BD9G500UEFJ-LA operates at a fixed switching frequency of 200 kHz, set by the RT resistor. Current-mode control provides inherently fast transient response and simplifies the phase-compensation network. The output voltage is programmed by the feedback resistor divider (R3/R4 for 5 V, R3/R5 for 3.3 V) connected to the FB pin, and the appropriate setting is selected by placing the shunt jumper on J1 (5 V) or J2 (3.3 V).
The module includes a Schottky catch diode (D1, RB088BM100TL), a 33 µH power inductor (L1), and a bulk output capacitor (C5, 220 µF/50 V). Input decoupling is provided by C3 and C4 (10 µF/100 V ceramic, 1210 package), with additional high-frequency filtering on the boot and bias rails. Screw terminal connectors (CN1, CN2) are used for both the input supply and the output load connection.
Specs and Features
- Input supply range: 7 to 60 V DC (76 V absolute maximum)
- Output voltage: 5.0 V or 3.3 V, selectable via jumper (J1/J2)
- Output current: 2 A nominal, 5 A maximum
- Switching frequency: 200 kHz
- Control architecture: current-mode
- Soft-start function to limit inrush current and output overshoot
- Over-current protection (OCP): auto-restart after 4 consecutive events
- Under-voltage lockout (UVLO): 6.4 V threshold, 200 mV hysteresis
- Over-voltage protection (OVP) with integrated discharge MOSFET
- Thermal shutdown (TSD): 175°C, 25°C hysteresis
- Enable control via EN pin (2.5 Von, 0.4 Voff)
- PCB dimensions: 53.34 × 32.86 mm
- Mounting holes: 4 × 2.5 mm
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This compact buck converter module accepts input voltages from 7 V to 60 V DC and steps them down to either 5.0 or 3.3 V. The output voltage is selectable via a jumper.
The heart of the design is the ROHM BD9G500UEFJ-LA, an 8-pin SMD buck converter IC with an integrated high-side power MOSFET featuring low on-resistance. The device operates in current-mode control and can supply continuous output currents up to 5 A, with a nominal rating of 2 A for typical use.
The BD9G500UEFJ-LA operates at a fixed switching frequency of 200 kHz, set by the RT resistor. Current-mode control provides inherently fast transient response and simplifies the phase-compensation network. The output voltage is programmed by the feedback resistor divider (R3/R4 for 5 V, R3/R5 for 3.3 V) connected to the FB pin, and the appropriate setting is selected by placing the shunt jumper on J1 (5 V) or J2 (3.3 V).
The module includes a Schottky catch diode (D1, RB088BM100TL), a 33 µH power inductor (L1), and a bulk output capacitor (C5, 220 µF/50 V). Input decoupling is provided by C3 and C4 (10 µF/100 V ceramic, 1210 package), with additional high-frequency filtering on the boot and bias rails. Screw terminal connectors (CN1, CN2) are used for both the input supply and the output load connection.
Specs and Features
- Input supply range: 7 to 60 V DC (76 V absolute maximum)
- Output voltage: 5.0 V or 3.3 V, selectable via jumper (J1/J2)
- Output current: 2 A nominal, 5 A maximum
- Switching frequency: 200 kHz
- Control architecture: current-mode
- Soft-start function to limit inrush current and output overshoot
- Over-current protection (OCP): auto-restart after 4 consecutive events
- Under-voltage lockout (UVLO): 6.4 V threshold, 200 mV hysteresis
- Over-voltage protection (OVP) with integrated discharge MOSFET
- Thermal shutdown (TSD): 175°C, 25°C hysteresis
- Enable control via EN pin (2.5 Von, 0.4 Voff)
- PCB dimensions: 53.34 × 32.86 mm
- Mounting holes: 4 × 2.5 mm
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