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STMicroelectronics UM3441 36 V – 1 A Synchronous Buck Converter
Specifications
- Product Name: STEVAL-3601CV1
- Converter: DCP3601 36 V – 1 A synchronous buck converter
- Package: SOT23-6L
- Input Voltage Range: 12V to 36V
- Output Voltage: 5V
- Output Current: Up to 1A
FAQS
- Q: What is the recommended input voltage range for the STEVAL-3601CV1?
- A: The input voltage range is from 12V to 36V.
- Q: How can I adjust the output voltage of the converter?
- A: You can adjust the output voltage by changing the power resistor or active load connected between VOUT and GND connectors.
Introduction
- The STEVAL-3601CV1 evaluation board demonstrates a smart converter design able to deliver up to 1 A output current from a 3.3 V to 36 V input, with a 5.0 V output voltage.
- The board features the DCP3601 miniaturized synchronous step-down converter, which implements enhanced peak current control and advanced design circuitry to minimize quiescent current, including also soft-start circuit, overcurrent protection circuit, overtemperature protection and output overvoltage protection.
- The board highlights key application benefits made possible by the DCP3601, including high efficiency and small PCB size, and is ideal for power conversion solutions in major appliances, smart metering, industrial 12/24 V bus conversion, and general-purpose wide Vin power supplies.
- The device used on this board is supplied in the SOT23-6L package.
- Notice: For dedicated assistance, submit a request through our online support portal at www.st.com/support.
Electrical performance specification
Table 1 provides a summary of the electrical performance of the STEVAL-3601CV1.
Table 1. Electrical performance specification (Ta = 25°C)
| Symbol | Parameter | Min. | Typ. | Max. | Unit |
| VIN | Input supply voltage | – | 12 or 24 | 36 | V |
| VOUT | Output voltage | – | 5 | – | V |
| IOUT | Output current | – | – | 1 | A |
Input Output connector descriptions
This section provides the descriptions of the input/output connectors present on the STEVAL-3601CV1.
- J1: Input power supply (Vin_EMC). Input voltage is filtered to decrease the EMI. Supply voltage should be set with a current limitation compatible with the power board request.
- J2: Main input power supply (Vin). Input voltage is not filtered to decrease the EMI. Supply voltage should be set with a current limitation compatible with the power board request.
- J3: Ground (Gnd)
- J4: Ground (Gnd)
- J5: Output voltage Connector (VOUT)
- P1: Input voltage sense Connector
- VIN_S: Input voltage sense
- VIN_S: Input voltage sense
- GND_S: Ground sense
- GND_S: Ground sense
- P3: Output voltage sense Connector
- VOUT_S: Output voltage sense
- VOUT_S: Output voltage sense
- GND_S: Ground sense
- GND_S: Ground sense
- P3: ENABLE pin.
- Place the jumper across EN and VIN to enable the buck converter
- Place the jumper across EN and GND to disable the buck converter
Input EMI filter
- The STEVAL-3601CV1 is compliant with CISPR16-4-2.
- An input filter helps to reduce EMI. The filter consists of a ferrite bead (L2), an inductor (L3), and three ceramic capacitors (C3, C4 and C5). An electrolytic capacitor is used for bulk energy storage and input damping.
How to use the board
The STEVAL-3601CV1 is set to deliver a 5 V output voltage. This board is best suited for applications where high efficiency at low current is preferred to output ripple.
- Step 1. Connect the voltage supply between VIN and GND connectors or VIN_EMC and GND connectors.
- Step 2. Connect the load (power resistor or active load) between the VOUT and GND connectors.
- Note: For Step 1 and Step 2 short wires are recommended.
- Step 3. Set the supply voltage VIN to 12 or 24 V.
- Step 4. By default, VOUT is set to 5 V. Increase or decrease the output power resistor or active load to reach the suitable output current (max. 1 A).
- Note: Using DCP3601CMR, at light load the board works in PSK mode to guarantee high efficiency performance.
Board Layout
This section shows the STEVAL-3601CV1 layout. All the dimensions are in millimeters (mm).
Schematic diagrams
Bill of materials
Table 2. STEVAL-3601CV1 bill of materials
| Item | Q.ty | Ref. | Part/value | Description | Manufacturer | Order code |
| 1 | 1 | R1 | 0 | Thick film resistor | RS | 732-5646 |
| 2 | 1 | R2 | 20 Ω | Thick film resistor | RS | 678-9973 |
| 3 | 1 | R3 | 73.2 kΩ | Thick film resistor | RS | 708-8981 |
| 4 | 1 | R4 | 15 kΩ | Thick film resistor | RS | 228-4708 |
| 5 | 2 | R5, R6 | NOT ASSEMBLY | Thick film resistor | ||
| 6 | 1 | C1 | 10 uF | 10uF/63V/20%
Hybrid Polymer |
WURTH
Electronics Inc |
875 575 844 001 |
| 7 | 3 | C2, C7, C9 | 0.1 uF | 0.1uF / 50V /
0603 / X7R / 10% |
TDK |
C1608X7R1H104K080AA |
| 8 | 1 | C3 | 100 nF | 100nF / 50V /
10% |
WURTH
Electronics Inc |
885 012 208 087 |
| 9 | 2 | C4, C5 | 2.2 uF | 2.2uF / 50V /
1812/ 10% |
WURTH
Electronics Inc |
885 012 210 032 |
| 10 | 1 | C6 | 2.2 uF | 2.2uF / 50V /
0805 / X7R / 10% |
TDK | C2012X7R1H225K125AC |
| 11 | 1 | C8 | 22 uF | 22uF / 25V /
0805 / X5R / 20% |
TDK | C2012X5R1E226M125A |
| 12 | 1 | C10 | NOT ASSEMBLY | |||
| 13 | 1 | L1 | 15 uH | WURTH
Electronics Inc |
744 393 305 150 | |
| 14 | 1 | L2 | WURTH
Electronics Inc |
742 792 651 | ||
| 15 | 1 | L3 | 1uH | WURTH
Electronics Inc |
744 383 130 10 | |
| 16 | 1 | U1 | DCP3601CMR | Synchronous step-down converter | ST | DCP3601CMR |
| 17 | 5 | J1, J2, J3, J4, J5 | – | PC SCREW TERMINAL, 22-14AWG | KEYSTONE | KEYSTONE 7693 |
| 18 | 2 | P1, P3 | – | Male SIL Vertical Throughboard Conn pitch 2.54mm | Wurth Electronics Inc | 61300411121 |
| 19 | 1 | P2 | – | Male SIL Vertical Throughboard Conn pitch 2.54mm | Wurth Electronics Inc | 61300311121 |
| Item | Q.ty | Ref. | Part/value | Description | Manufacturer | Order code |
| 20 | 1 | JP1 | – | Female Straight Black Closed Top 2 Way 1 Row 2.54mm Pitch | RS | 251-8503 |
Board versions
Table 3. STEVAL-3601CV1 versions
| Finished good | Schematic diagrams | Bill of materials |
| STEVAL$3601CV1A(1) | STEVAL$3601CV1A schematic diagrams | STEVAL$3601CV1A bill of materials |
- This code identifies the STEVAL-3601CV1 evaluation board first version.
FCC
Regulatory compliance information
Notice for US Federal Communication Commission (FCC)
For evaluation only; not FCC approved for resale
FCC NOTICE – This kit is designed to allow:
- Product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and
- Software developers to write software applications for use with the end product.
This kit is not a finished product and when assembled may not be resold or otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition that this product not cause harmful interference to licensed radio stations and that this product accepts harmful interference. Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter 3.1.2.
Notice for Innovation, Science and Economic Development Canada (ISED)
- For evaluation purposes only. This kit generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to Industry Canada (IC) rules.
- Notice for the European Union
- This device is in conformity with the essential requirements of the Directive 2014/30/EU (EMC) and of the
- Directive 2015/863/EU (RoHS).
Notice for the United Kingdom
- This device is in compliance with the UK Electromagnetic Compatibility Regulations 2016 (UK S.I. 2016 No. 1091) and with the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations 2012 (UK S.I. 2012 No. 3032).
Revision history
Table 4. Document revision history
| Date | Revision | Changes |
| 06-Nov-2024 | 1 | Initial release. |
| 19-Dec-2024 | 2 | Updated title in cover page and Section Introduction. |
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- Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
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Documents / Resources
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STMicroelectronics UM3441 36 V - 1 A Synchronous Buck Converter [pdf] User Manual UM3441, UM3441 36 V - 1 A Synchronous Buck Converter, 36 V - 1 A Synchronous Buck Converter, Synchronous Buck Converter, Buck Converter, Converter |