Step-down DC/DC Converter Lineup
* For technical terms on the list, please refer to "Application Note".
Thermal :Thermal shutdown circuit Discharge :Auto-Discharge function Shutdown :Shutdown function Sequence :Power on sequence controllable
Thermal :Thermal shutdown circuit Discharge :Auto-Discharge function Shutdown :Shutdown function Sequence :Power on sequence controllable
| Product Name |
Control | Input Voltage Range |
Output Voltage Range |
Accuracy*1 | Frequency | Output Tr. |
IOUT*2 | UVLO | Soft Start |
Protection Circuit |
Features | Packages | Data Sheet |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| R1224N | PWM, PWM/VFM Auto change |
2.3V to 18.5V | 1.2V to 6.0V | ±2% | 180kHz |
Ext. | - |  |
|
Reset type | SOT-23-5 |  |
|
| 300kHz | |||||||||||||
| Ext. adjustable | 500kHz | ||||||||||||
| R1225N | PWM, PWM/VFM Auto change |
2.3V to 18.5V | 1.2V to 6.0V | ±2% | 180kHz |
Ext. | - | |
|
Latch type | SOT-23-6W | |
|
| 300kHz | |||||||||||||
| 500kHz | |||||||||||||
| R1232D | PWM | 2.6V to 5.5V | 0.9V to 3.3V | ±2% | 1MHz |
Int. | 1A | |
|
Latch type | Sync. Rectifier. | SON-8 | 1.30MB |
| Ext. adjustable | ±16mV | 2.25MHz | |||||||||||
| R1240x | PWM | 4.5V to 30.0V | Ext. adjustable between 0.8V to 15.0V | ±1.5% (±12mV) |
1.25MHz | Int. | 1.2A | |
|
Latch type Fold back type*3 |
Thermal | DFN(PLP)2527-10 SOT-23-6W |
|
| R1242S | PWM | 5.0V to 30.0V | Ext. adjustable between 0.8V to 15.0V | ±1.5% (±12mV) |
330kHz |
Int. | 3A | |
|
Latch type Fold back type*3 |
Sync. Rectifier with Ext. Low-side Tr Thermal |
HSOP-8E | |
| 500kHz | |||||||||||||
| 1MHz | |||||||||||||
| Ext. adjustable | |||||||||||||
| R1243x | PWM | 4.5V to 30.0V | Ext. adjustable between 0.8V to 15.0V |
±1.4% (±7mV) |
330kHz |
Int. | 2A | |
（Ext. adjustable） |
Latch type Fold back type*3 |
Thermal | HSOP-8E DFN(PLP)2527-10 |
|
| 1MHz | |||||||||||||
| Product Name |
Control | Input Voltage Range |
Output Voltage Range |
Accuracy*1 | Frequency | Output Tr. |
IOUT*2 | UVLO | Soft Start |
Protection Circuit |
Features | Packages | Data Sheet |
 R1245x |
PWM | 4.5V to 30.0V | Ext. adjustable from 0.8V | ±1% (±8mV) |
330kHz |
Int. | 1.2A | |
|
Latch type Fold back type*3 |
Thermal | DFN(PLP)2020-8 SOT-23-6W HSOP-8E |
1.06MB |
| 500kHz |
|||||||||||||
| 1MHz |
|||||||||||||
| 2.4MHz | |||||||||||||
| RP500x | PWM, PWM/VFM Auto change |
2.55V to 5.5V | 1.1V to 3.3V | ±1.5% | 1.2MHz | Int. | 600mA | |
|
Latch type | Sync. Rectifier. Discharge |
WLCSP-6-P2 DFN1616-6 DFN(PLP)1820-6 SOT-23-6W |
|
| RP501K | PWM, PWM/VFM Auto change |
2.5V to 5.5V | 1.0V to 3.3V | ±1.5% | 2.25MHz | Int. | 1A | |
|
Latch type | Sync. Rectifier. Discharge |
DFN(PLP)2527-10 | 1.17MB |
| RP502x | PWM, PWM/VFM Auto change |
2.5V to 5.5V | 0.8V to 3.3V | ±1.5% | 3.3MHz | Int. | 600mA | |
|
Latch type | Sync. Rectifier. Discharge |
WLCSP-6-P2 DFN1616-6 |
1.19MB |
| RP503x | PWM/VFM Auto change |
2.5V to 5.5V | 0.8V to 2.5V | ±1.5% | 2MHz | Int. | 600mA | |
|
Latch type | Sync. Rectifier. High-efficiency at low output current. Discharge |
WLCSP-6-P2 DFN1616-6 SOT-23-5 |
|
| RP504x | PWM, PWM/VFM Auto change |
2.3V to 5.5V | 0.8V to 3.3V | ±1.5% (±18mV) |
2.25MHz | Int. | 600mA | |
|
Latch type | Sync. Rectifier. PWM⇔PWM/VFM control by Pin. Discharge |
DFN(PLP)1216-6F DFN1616-6B SOT-23-5 |
|
| RP505K | PWM, PWM/VFM Auto change |
2.3V to 5.5V | 0.8V to 3.3V | ±1.5% (±18mV) |
2.25MHz | Int. | 1A | |
|
Latch type | Sync. Rectifier. High-efficiency at low output current. PWM⇔PWM/VFM control by Pin. Thermal Discharge |
DFN(PLP)2020-8 | 1.06MB |
| Ext. adjustable | |||||||||||||
| Product Name |
Control | Input Voltage Range |
Output Voltage Range |
Accuracy*1 | Frequency | Output Tr. |
IOUT*2 | UVLO | Soft Start |
Protection Circuit |
Features | Packages | Data Sheet |
- *1When the output voltage is adjusted by external resistors, the value means the feedback voltage accuracy.
- *2This is an approximate value, because output current depends on conditions and external parts.
- *3The Fold-Back Protection circuit will execute current limitation while lowering operational frequency and continue operation for output short circuits, etc. When abnormal conditions are resolved, operating frequency becomes normal again and normal conditions are resumed.
Dual Output
| Product Name |
Control | Input Voltage Range |
Output Voltage Range |
Accuracy*1 | Frequency | Output Tr. |
IOUT*2 | UVLO | Soft Start |
Protection Circuit |
Features | Packages | Data Sheet |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
RP550K |
Forced PWM, PWM/VFM Auto switching |
2.3V to 5.5V (VOUT ≥ 0.8V) |
Ext. adjustable between 0.6V to 3.3V |
±9mV | 2.25MHz | Int. | 1Ax2 | |
|
Latch type | Sync. Rectifier. High-efficiency at low output current. PWM⇔PWM/VFM control by MODE Pin.*3 Thermal |
DFN(PLP)2730-12 | 1.14MB |
- *1When the output voltage is adjusted by external resistors, the value means the feedback voltage accuracy.
- *2This is an approximate value, because output current depends on conditions and external parts.
- *3The VIN pin must be connected to the same levels when it is mounted on board.
* For technical terms on the list, please refer to "Application Note".
Thermal :Thermal shutdown circuit Discharge :Auto-Discharge function Shutdown :Shutdown function Sequence :Power on sequence controllable
Thermal :Thermal shutdown circuit Discharge :Auto-Discharge function Shutdown :Shutdown function Sequence :Power on sequence controllable
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