ROHM BD9E202FP4-Z Single Synchronous Buck DC DC Converter
Specifications
- Input Voltage: 4.5V – 28V
- Output Voltage: 0.7V – 0.8 x VIN
- Output Current Range: 0A – 2.0A
- Switching Frequency: Up to 500kHz
- Maximum Efficiency: Up to 95.5%
Introduction
This user’s guide will provide the necessary steps to operate the Evaluation Board of ROHM’s BD9E202FP4-Z Single Synchronous Buck DC/DC converter. This includes the external parts and operating procedures. For the reference application data please refer to the datasheet.
Description
This Evaluation Board was developed for ROHM’s single Synchronous buck DC/DC converter BD9E202FP4-Z. BD9E202FP4- Z is a synchronous buck DC/DC converter with built-in low On Resistance power MOSFETs. The Light Load Mode control provides excellent efficiency characteristics in light-load conditions, which makes the product ideal for equipment and devices that demand minimal standby power consumption. BD9E202FP4-Z has Frequency spread spectrum. BD9E202FP4-Z includes internal phase compensation. It achieves the high power density and offers a small footprint on the PCB by employing small package.
Application
- Home Appliance Products
- Secondary Power Supply and Adapter Equipment
- Telecommunication Devices
Recommended Operating Conditions
Table 1. Recommended Operating Conditions
| Parameter | Min | Typ | Max | Units | Conditions |
| Input Voltage | 4.5 | – | 28 | V | |
| Output Voltage | 0.7 | – | VIN x 0.8 | V | (Note 2) |
| Output Current Range | 0 | – | 2.0 | A | |
| Switching Frequency | – | 500 | – | kHz | |
| Maximum Efficiency | – | 95.5 | – | % | VIN = 12.0 V, Vo = 5.0 V, Io =
0.45 A, Ta = 25 °C |
- Note 1) Tj must be 150 °C or less under the actual operating environment. Lifetime is derated at junction temperature greater than 125 °C.
- (Note 2) Please use within the range of VOUT ≥ VIN × 0.1 V.
Evaluation Board
Evaluation Board Schematic
Operating Procedure
- Connect the GND terminal of the power supply to the GND terminal of Evaluation Board.
- Connect power supply to the VIN pin of the Evaluation Board.
- Connect the load to the Evaluation Board’s VOUT and GND terminals. When using an electronic load, connect with the load turned off.
- Connect a voltmeter to the Evaluation Board’s VOUT and GND terminals.
- Turn on the Power supply of VIN.
- Make sure that the voltmeter is set to measure voltage.
- Turn on the electronic load.
(Caution) This Evaluation Board does not support hot plug. Do not perform hot plug test.
(Note 1) EN voltage is divided by R4 and R5 from VIN, the IC’s power can only be controlled by VIN.
Pin Configuration
Parts List
Table 2. Parts list (VOUT = 3.3 V)
| No | Package | Parameters | Part Name (Series) | Type | Manufacturer |
| L1 | 8080 | 10 μH | 1217AS-H-100M | Inductor | Murata |
| C1 (Note1) | 1005 | 0.1 μF (50 V, X5R, ±10 %) | GRM155R61H104KE14 | Ceramic Capacitor | Murata |
| C2 (Note2) | 3225 | 10 μF (100 V, X7S, ±10 %) | GRM32EC72A106KE05 | Ceramic Capacitor | Murata |
| C4 (Note3) | 1005 | 0.1 μF (50 V, X5R, ±10 %) | GRM155R61H104KE14 | Ceramic Capacitor | Murata |
| R6 | – | Short | – | – | – |
| C5 (Note4) | 3225 | 22 μF (25 V, X7R, ±10 %) | GRM32ER71E226KE15 | Ceramic Capacitor | Murata |
| C6 (Note4) | 3225 | 22 μF (25 V, X7R, ±10 %) | GRM32ER71E226KE15 | Ceramic Capacitor | Murata |
| C7 (Note4) | – | – | – | – | – |
| C8 | 0603 | 56 pF (50 V, C0G, ±5 %) | GRM0335C1H560JA01D | Ceramic Capacitor | Murata |
| R7 | – | Short | – | – | – |
| R1 | – | Short | – | – | – |
| R2 | 1005 | 100 kΩ (1 %, 1/16 W) | MCR01MZPF1003 | Chip Resistor | ROHM |
| R3 | 1005 | 22 kΩ (1 %, 1/16 W) | MCR01MZPF2202 | Chip Resistor | ROHM |
| R4 (Note5) | 1005 | 510 kΩ (1 %, 1/16 W) | MCR01MZPF5103 | Chip Resistor | ROHM |
| R5 (Note5) | 1005 | 82 kΩ (1 %, 1/16 W) | MCR01MZPF8202 | Chip Resistor | ROHM |
| R0 (Note6) | – | Short | – | – | – |
Table 3. Parts list (VOUT = 5 V)
| No | Package | Parameters | Part Name (Series) | Type | Manufacturer |
| L1 | 8080 | 15 μH | 1217AS-H-150M | Inductor | Murata |
| C1 (Note1) | 1005 | 0.1 μF (50 V, X5R, ±10 %) | GRM155R61H104KE14 | Ceramic Capacitor | Murata |
| C2 (Note2) | 3225 | 10 μF (100 V, X7S, ±10 %) | GRM32EC72A106KE05 | Ceramic Capacitor | Murata |
| C4 (Note3) | 1005 | 0.1 μF (50 V, X5R, ±10 %) | GRM155R61H104KE14 | Ceramic Capacitor | Murata |
| R6 | – | Short | – | – | – |
| C5 (Note4) | 3225 | 22 μF (25 V, X7R, ±10 %) | GRM32ER71E226KE15 | Ceramic Capacitor | Murata |
| C6 (Note4) | 3225 | 22 μF (25 V, X7R, ±10 %) | GRM32ER71E226KE15 | Ceramic Capacitor | Murata |
| C7 (Note4) | – | – | – | – | – |
| C8 | 0603 | 75 pF (50 V, C0G, ±5 %) | GRM0335C1H750JA01D | Ceramic Capacitor | Murata |
| R7 | – | Short | – | – | – |
| R1 | 1005 | 0.82 kΩ (1 %, 1/16 W) | MCR01MZPF8200 | Chip Resistor | ROHM |
| R2 | 1005 | 110 kΩ (1 %, 1/16 W) | MCR01MZPF1103 | Chip Resistor | ROHM |
| R3 | 1005 | 15 kΩ (1 %, 1/16 W) | MCR01MZPF1502 | Chip Resistor | ROHM |
| R4 (Note5) | 1005 | 510 kΩ (1 %, 1/16 W) | MCR01MZPF5103 | Chip Resistor | ROHM |
| R5 (Note5) | 1005 | 82 kΩ (1 %, 1/16 W) | MCR01MZPF8202 | Chip Resistor | ROHM |
| R0 (Note6) | – | Short | – | – | – |
Table 4. Parts list (VOUT = 12 V)
| No | Package | Parameters | Part Name (Series) | Type | Manufacturer |
| L1 | 8080 | 22 μH | 1217AS-H-220M | Inductor | Murata |
| C1 (Note1) | 1005 | 0.1 μF (50 V, X5R, ±10 %) | GRM155R61H104KE14 | Ceramic Capacitor | Murata |
| C2 (Note2) | 3225 | 10 μF (100 V, X7S, ±10 %) | GRM32EC72A106KE05 | Ceramic Capacitor | Murata |
| C4 (Note3) | 1005 | 0.1 μF (50 V, X5R, ±10 %) | GRM155R61H104KE14 | Ceramic Capacitor | Murata |
| R6 | – | Short | – | – | – |
| C5 (Note4) | 3225 | 22 μF (25 V, X7R, ±10 %) | GRM32ER71E226KE15 | Ceramic Capacitor | Murata |
| C6 (Note4) | 3225 | 22 μF (25 V, X7R, ±10 %) | GRM32ER71E226KE15 | Ceramic Capacitor | Murata |
| C7 (Note4) | – | – | – | – | – |
| C8 | 0603 | 100 pF (50 V, C0G, ±5 %) | GRM0335C1H101JA01D | Ceramic Capacitor | Murata |
| R7 | – | Short | – | – | – |
| R1 | – | Short | – | – | – |
| R2 | 1005 | 130 kΩ (1 %, 1/16 W) | MCR01MZPF1303 | Chip Resistor | ROHM |
| R3 | 1005 | 6.8 kΩ (1 %, 1/16 W) | MCR01MZPF6801 | Chip Resistor | ROHM |
| R4 (Note5) | 1005 | 470 kΩ (1 %, 1/16 W) | MCR01MZPF4703 | Chip Resistor | ROHM |
| R5 (Note5) | 1005 | 33 kΩ (1 %, 1/16 W) | MCR01MZPF3302 | Chip Resistor | ROHM |
| R0 (Note6) | – | Short | – | – | – |
- (Note 1) In order to reduce the influence of high frequency noise, connect a 0.1 μF ceramic capacitor C1 as close as possible to the VIN pin and the GND pin.
- (Note 2) For the input capacitor C2, take temperature characteristics, DC bias characteristics, etc. into consideration and set the actual capacitance to no less than 3.0 μF.
- (Note 3) For the bootstrap capacitor C4, take temperature characteristics, DC bias characteristics, etc. into consideration and set the actual capacitance to no less than 0.022 μF.
- (Note 4) Because the actual capacitance value is changing due to temperature characteristics, DC bias characteristics, etc. of the output capacitor C5, C6 and C7, the loop response characteristics may change. Please confirm the actual application.
- (Note 5) R4 and R5 are used for setting the UVLO threshold voltage higher than the default internal UVLO Threshold Voltage.
Based on the External UVLO setting in Page 17 of the Datasheet, the recommended UVLO setting values are as below:
Table 5. UVLO Setting by R4 and R5R4 R5 VOUT UVLO Detection UVLO Release 510 kΩ 82 kΩ 3.3 V 7.44 V (Typ.) 8.38 V (Typ.) 510 kΩ 82 kΩ 5 V 7.44 V (Typ.) 8.38 V (Typ.) 470 kΩ 33 kΩ 12 V 17.1 V (Typ.) 18.1 V (Typ.) - (Note 6) R0 is an option used for feedback’s frequency response measurement. By inserting a resistor at R0, it is possible to measure the frequency response (phase margin) using an FRA. However, the resistor should not be used in actual application so please short this resistor pattern during actual application.
- (Note 7) If the recommended parts on tables 2, 3 and 4 are not available anymore due to end of production, different parts will be used on the test board because the end of production parts are deprecated.
Board Layout
Evaluation Board PCB information
| Number of Layers | Material | Board Size | Copper Thickness |
| 4 | FR-4 | 114.3mm x 76.2mm x 1.6mm | 2oz(70μm) / 1oz (35μm) / 1oz (35μm) / 2oz(70μm) |
The layout of BD9E202FP4-Z is shown below:
Revision History
|
Date |
Revision Number |
Description |
| 24. Aug. 2023 | 001 | New release |
| 10. Apr. 2024 | 002 | Add board Input and output conditions to subtitle |
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 own 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 own 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 the input voltage exceed 28V?
A: No, the input voltage should not exceed 28V as per the recommended operating conditions.
Q: What is the maximum output current supported?
A: The BD9E202FP4-Z Evaluation Board supports a maximum output current of 2.0A.
Documents / Resources
 |
ROHM BD9E202FP4-Z Single Synchronous Buck DC DC Converter [pdf] User Guide BD9E202FP4-Z, BD9E202FP4-EVK-001, BD9E202FP4-Z Single Synchronous Buck DC DC Converter, BD9E202FP4-Z, Single Synchronous Buck DC DC Converter, Synchronous Buck DC DC Converter, Buck DC DC Converter, Converter |