RICOH RN5T659 User Guide
Summary
This constant frequency charge pump is engineered for advanced white LED lighting solutions, providing precise and efficient power management. It offers comprehensive control over output enable/disable, current limits (up to 115mA), and LDO functions using a single-wire serial pulse interface. The accompanying manual serves as a thorough technical guide for system designers, detailing electrical characteristics, multiple operational modes, critical protection features (UVLO, thermal shutdown), and optimal circuit implementation guidelines for reliable LED driver integration.
Page 1 Text Content
Charge pump for White LED
RN5T659 Development Specifications
Rev. 1.2
RICOH COMPANY, LTD. Electronic Devices Company
This specification is subject to change without notice.
Page Summary Contents For RICOH RN5T659 User Guide
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 17 |
| File Size | 1.27 MB |
| Published | May 31, 2026 |
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Frequently Asked Questions
What is the maximum current capability of this charge pump?
The device has a current capability of up to 115mA.
How is overheating addressed by the unit?
Overheat state is detected using two temperature detection circuits that compare output voltages, causing the device to turn off for protection.
What control features are available for the outputs?
Output enable/disable, LED current, and LDO ON/OFF can be individually controlled through a single wire serial pulse I/F.
What is the recommended working voltage range?
The operating voltage range is 2.7 V to 4.5 V, while recirculation is recommended between 3.0 V and 4.5 V.