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Special Contents for Automotive Applications
Electrification of automobile by RICOH power management IC
The reason RICOH power management IC has been chosen for more than 20 years
Special Contents for IoT Devices
Supporting your IoT system construction
Ultra-low supply current / Low noise / Low electromotive force / Battery monitoring
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RICOH's 3 approaches to industrial equipment field
Long term supply / Flexible quantity purchase / High quality and reliability
Design Support
Technical Information on Power Management ICs
Small in Size, Efficient in Heat Dissipation and Suitable for Automotive.
Ricoh's Thermal Design Support
You can analyze thermal characteristics at customer's concept design stage
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About RICOH Electronic Devices
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- Application Note : DCDC Converters (Switching Regulators)
- Internal or External Output Transistors
Application Note : DCDC Converters (Switching Regulators)
Internal or External Output Transistors
Ricoh’s DCDC converters are equipped with internal or external output transistors.
The device equipped with an internal output transistor and the Lx pin is classified as DCDC converter.
The device equipped with an external output transistor and the EXT pin is classified as DCDC controller.
The device equipped with both internal and external output transistors is listed along with the DCDC converters.
A power MOSFET should be used with the external output transistor type.
To achieve high efficiency under heavy load, a MOSFET with a low ON resistance should be used.
To achieve high efficiency under light load, a MOSFET with a small gate capacity should be used.
As for MOSFETs, the maximum drain current should be higher than the maximum inductor current.
RP505Kxx1A/B
(Internal Output Transistor Type)
R1224Nxx2E/F/G/H/L/M
(External Output Transistor Type)
Internal Output Transistor Type
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- PWM Control and VFM Control
- Internal or External Output Transistors
- Output Voltage Setting
- Diode Rectifier and Synchronous Rectifier
- Undervoltage Lockout (UVLO) Function
- Soft-Start Function
- Externally Programmable Maximum Duty Cycle
- Externally Adjustable Phase Compensation
- Overvoltage Protection (OVP)
- Overcurrent Protection
- Sequence Control
- Shutdown Function
- LED High-speed Dimming Control
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