ROHM BD8303MUV EVK Synchronous Buck Boost Controller
Specifications
- Input Voltage: 4.0V – 7.4V
- Output Voltage: 12V
- Output Current Range: 0A – 1.5A
- Operating Frequency: Up to 400 kHz
- Maximum Efficiency: 92%
Product Usage Instructions
Operating Procedure
- Turn off the power supply and connect its GND terminal to the EVK’s GND terminal.
- Connect the power supply’s positive terminal to the VIN terminal of the EVK.
- Ensure the electronic load is off, then connect it to the VOUT and GND terminals of the EVK.
- Connect a voltmeter to the VOUT_S and GND terminals of the EVK.
- Check that the shunt jumper of STB_SW is at position H.
- Turn on the power supply and verify that the voltmeter reads 12V.
- Turn on the electronic load.
Notes: Do not hot plug the board as it does not support hot plugging protection.
Operation State Settings
| STB_SW state | BD8303MUV Condition |
|---|---|
| ON (short to VIN) | Enable |
| OFF (short to GND) | Shutdown |
Switching Regulator Series
Synchronous Buck-Boost Controller BD8303MUV EVK
BD8303MUV-EVK-001 (7.4V → 12V, 1.5A)
Introduction
This user’s guide will provide the steps necessary to operate the BD8303MUV-EVK-001 and evaluate ROHM’s BD8303MUV synchronous buck-boost DC/DC controller. Component selection, operating procedures and application data are included.
Description
This EVK uses a synchronous rectifying buck-boost DC / DC controller IC BD8303MUV to output 12V from an input voltage of 4V to 14V. BD8303MUV accepts a power supply input range of 2.7V to 14V. The output voltage can be set from 1.8V to 12V with an external resistor. The operating frequency can be set from 200 kHz to 1 MHz with an external resistor. The IC implements an efficient buck-boost converter using one inductor and external channel FETs. It has a built-in soft start function for rush current countermeasures at startup, UVLO.
(Under Voltage Lock Out), TSD (Thermal Shutdown Detection) and SCP (Short Circuit Protection).
Application
General Portable Equipment such as:
- DVC (Digital Video Camera)
- Single-Lens Reflex Cameras
- Portable DVD player
- Laptop PCs
Operating Limits
| Parameter | Min | Typ | Max | Units | Conditions |
| Input Voltage | 4.0 | 7.4 | 14 | V | *note 1 |
| Output Voltage | 12 | V | RINV1=330kΩ、RINV2=30kΩ | ||
| Output Current Range | 1.5 | A | |||
| Operating Frequency | 400 | kHz | RT=75kΩ | ||
| Maximum Efficiency | 92 | % | IOUT = 1.5A | ||
Note.
(note 1) Although the IC operating range is up to 14V, this EVK is equipped with a 10V operating Zener diode D1 in front of the VCC pin to protect the IC. Therefore, please operate with an input voltage of 9V or less.
EVK
EVK Schematic
Operating Procedure
Below is the procedure to operate the EVK.
- Turn off the power supply and connect the power supply’s GND terminal to the GND terminal of the EVK.
- Connect the power supply’s positive terminal to the VIN terminal of the EVK.
- Check if the electronic load is turned off and connect the electronic load to the VOUT terminal and the GND terminal of the EVK.
- Connect the voltmeter to the VOUT_S terminal and the GND terminal of the EVK.
- Check if the shunt jumper of STB_SW is at position H.
- Turn on the power supply and check if the measured value of the voltmeter is 12V.
- Turn on the electronic load.
Notes:
The board does not support hot plugging protection. Do not perform hot plugging on this board.
Operation State Settings
Table 2 is the BD8303MUV condition using STB_SW.
Table 2. STB_SW Settings
| STB_SW state | BD8303MUV Condition |
| ON (short to VIN) | Enable |
| OFF (short to GND) | Shutdown |
BOM
Below is a table with the bill of materials.
Table 3. Bill of Materials
|
Count |
Parts No. |
Type |
Value |
Description |
Part Number |
Manufacturer |
Configuration |
| Inch(mm) | |||||||
| 1 | U1 | IC | – | Buck-boost DC/DC Controller | BD8303MUV | ROHM | 1111(3030) |
| 2 | CIN1, CIN2 | Ceramic Capacitor | 10μF | 25V, B, ±10% | GRM21BB31E106MA73 | MURATA | 0805(2012) |
| 3 | CO1, CO2, CO3 | Ceramic Capacitor | 47μF | 16V, B, ±20% | GRM32EB31C476ME15 | MURATA | 1210(3225) |
| 1 | CVCC | Ceramic Capacitor | 0.1μF | 50V, X7R, ±10% | GRM155R71H104KE14 | MURATA | 0402(1005) |
| 1 | CREG | Ceramic Capacitor | 1μF | 16V, B, ±10% | GRM155B31C105KA12 | MURATA | 0402(1005) |
| 1 | CFB | Ceramic Capacitor | 0.022μF | 50V, B, ±10% | GRM155B11E223KA61 | MURATA | 0402(1005) |
| 1 | CC | Ceramic Capacitor | 68pF | 50V, C0G, ±5% | 885012005060 | Wurth elektronik | 0402(1005) |
| 0 | CSTB, CO4 | Ceramic Capacitor | No mount | N/A | N/A | N/A | – |
| 2 | CB1, CB2 | Ceramic Capacitor | 0.1μF | 50V, X7R, ±10% | GRM155R71H104KE14 | MURATA | 0402(1005) |
| 1 | RT | Resistor | 75kΩ | 50V, 0.1W, ±0.5% | MCR03EZPD7502 | ROHM | 0603(1608) |
| 1 | RFB | Resistor | 7.5kΩ | 50V, 0.1W, ±0.5% | MCR03EZPD7501 | ROHM | 0603(1608) |
| 1 | RINV1 | Resistor | 330kΩ | 50V, 0.1W, ±0.5% | MCR03EZPD3303 | ROHM | 0603(1608) |
| 1 | RINV2 | Resistor | 30kΩ | 50V, 0.1W, ±0.5% | MCR03EZPD3002 | ROHM | 0603(1608) |
| 1 | RC | Resistor | 5.1kΩ | 50V, 0.1W, ±0.5% | MCR03EZPD5101 | ROHM | 0603(1608) |
| 4 | RG1, RG2, RG3, RG4 | Resistor | 22Ω | 50V, 0.1W, ±0.5% | MCR03EZPD22R0 | ROHM | 0603(1608) |
| 0 | RSTB, RFRA | Resistor | – | SHORT | N/A | N/A | – |
|
4 |
Q1, Q2, Q3, Q4 |
FET |
30V, 7A |
Nch, VGS=4.5V, RDS(on)=25mΩ 5.8nC, SOP-8 |
RXH070N03 |
ROHM |
2024(5060) |
| 2 | DB1, DB2 | Diode | 30V, 0.1A | VF(max)=0.35V, @IF=0.01A | RB521CM-30 | ROHM | 0403(1006) |
| 0 | DA1, DA2 | Diode | No mount | N/A | N/A | N/A | – |
| 1 | D1 (*note 4) | Diode | 10V | 500mW | TFZV10B | ROHM | 0.55 x 0.079
(1.4 x 2.0) |
| 1 | L | Inductor | 4.7μH | 8.5A, -40%-+20% | 74477004 | WURTH | 0.47 x 0.47
(12 x 12) |
| 0 | FILT | Inductor | – | SHORT | N/A | N/A | – |
| 0 | STB_SW | – | – | SWITCH | – | – | – |
| 0 | JSTB | – | – | SHORT | N/A | N/A | – |
Note.
- (*note 2) If the overshoot voltage exceeds the maximum rating of 15V for SW1 and SW2, adjust the gate resistance value. Be careful not to overlap the high side and low side gate voltages. As an alternative, add a resistor and capacitor snubber circuit between the SW1 terminal and GND, and between the SW2 terminal and GND.
- (*note3) Recommended parts are selected from those products and information available at the time this data sheet (Rev.001) was released. If supply conditions change and parts are not available, use similar parts.
- (*note 4) D1 TFZV10B has been added from EVK Rev.003.
Board Layout
EVK PCB information
| Number of Layers | Material | Board Size | Copper Thickness |
| 4 | FR-4 High TG | 80mm x 70mm x 1.6mmt | 1oz (35μm) |
following the layout of BD8303MUV-EVK-001
Reference Application Data
Revision History
| Date | Revision Number | Description |
| 22. Feb. 2021 | 001 | Initial release |
| 18. Oct. 2023 | 002 | p.2 Changed to a photo with RG1, RG2, RG3, and RG4 added in Figure.1.
p.4 CC 68pF of TaTable is changed from GRM1552C1H680JA01 to 885012005060. p.4 RFB ofTable .3 is changed from MCR03ECPD7501 to MCR03EZPD7501. p.4 Add comment. Recommended parts are selected from those products and information available at the time this user’s guide (Rev.001) was released. If supply conditions change and parts are not available, use similar parts.” p.5 Copper Thickness changed from 2oz to 1oz. |
| 13. May. 2024 | 003 | Added D1 TFZV10B to the circuit diagram and parts list. |
Notice
- The information contained in this document is intended to introduce ROHM Group (hereafter referred to as ROHM) products. When using ROHM products, please verify the latest specifications or datasheets before use.
- ROHM products are designed and manufactured for use in general electronic equipment and applications (such as Audio Visual equipment, Office Automation equipment, telecommunication equipment, home appliances, amusement devices, etc.) or specified in the datasheets. Therefore, please contact the ROHM sales representative before using ROHM products in equipment or devices requiring extremely high reliability and whose failure or malfunction may cause danger or injury to human life or body or other serious damage (such as medical equipment, transportation, traffic, aircraft, spacecraft, nuclear power controllers, fuel control, automotive equipment including car accessories, etc. hereafter referred to as Specific Applications). Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties arising from the use of ROHM Products for Specific Applications.
- Electronic components, including semiconductors, can fail or malfunction at a certain rate. Please be sure to implement, at your responsibility, adequate safety measures, including but not limited to fail-safe design against physical injury, and damage to any property, which a failure or malfunction of products may cause.
- The information contained in this document, including application circuit examples and their constants, is intended to explain the standard operation and usage of ROHM products, and is not intended to guarantee, either explicitly or implicitly, the operation of the product in the actual equipment it will be used. As a result, you are solely responsible for it, and you must exercise your independent verification and judgment in the use of such information contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties arising from the use of such information.
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FAQ
Q: Can I operate the EVK with an input voltage higher than 9V?
A: Although the IC operating range is up to 14V, the EVK is equipped with a Zener diode to protect the IC, so it is recommended to operate with an input voltage of 9V or less.
Documents / Resources
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ROHM BD8303MUV EVK Synchronous Buck Boost Controller [pdf] User Guide BD8303MUV EVK, BD8303MUV-EVK-001, BD8303MUV EVK Synchronous Buck Boost Controller, BD8303MUV EVK, Synchronous Buck Boost Controller, Buck Boost Controller, Boost Controller, Controller |