What the current board shows (e.g., pulling excessive current, missing power rails). Share public link
Full technical summaries and control diagrams referencing the 9E102 can be found on document-sharing platforms: Datasheet Overview: A 5-page overview is available via
: Some distributors list the MP1432 step-down converter as a direct equivalent or related part for 9E102 specifications in SOP-8 packaging.
According to factory specifications listed across distributor documentation like UTSource and Alldatasheet , the chip is housed in a standard format. It provides stable voltage regulation with minimal standby power drew: Specification Rating Package Type SOP-8 (8-pin Surface Mount) Input Voltage Range ( VINcap V sub cap I cap N end-sub ) 4.5V to 28V Operating Voltage ( VCCcap V sub cap C cap C end-sub ) 2.7V to 5.5V (Internal Logic) Switching Frequency 300 kHz to 1.2 MHz Operating Temperature -40°C to +85°C Typical Power Consumption Typical Bandwidth Pinout Configuration (SOP-8 Package) 9e102 datasheet
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Delivers up to 1.0 A of output current. Fixed Switching Frequency: 570 kHz (Typical).
Integrated MOSFETs for improved efficiency over asynchronous designs. What the current board shows (e
) : Typically fixed at 550 kHz, adaptive across 300 kHz to 1.2 MHz : 90 mΩ (Typical) Low-Side MOSFET On-Resistance : 70 mΩ (Typical) Quiescent Current ( IQcap I sub cap Q ) : 10 µA Operating Supply Current : 290 µA
Keep the trace for the SW pin small to reduce EMI radiation. 7. Conclusion ROHM BD9E102FJ
). The output voltage formula relies on an internal reference voltage ( It provides stable voltage regulation with minimal standby
: This architecture provides high-speed transient response and allows for easy phase compensation settings.
Thus, = 1 nF capacitor, with 'E' indicating a stable dielectric, and '9' representing the voltage rating. However, always verify with the specific brand's datasheet—some manufacturers use '9' for tolerance (e.g., ±5%), others for voltage.
A standout feature highlighted in the ROHM BD9E102FJ Technical Documentation is its proprietary SLLM™ control scheme. While standard buck regulators suffer from severe efficiency drops when load currents fall, SLLM™ automatically transitions the IC into an energy-saving mode during light loads. It maintains a high efficiency of approximately 80% even at a minuscule output current of 2. Current Mode Control Architecture
The ultimately describes a 1000 pF, 50V, X7R, 0603 or 0805 SMD ceramic capacitor —a workhorse component in countless consumer, automotive, and industrial electronics. While the exact "9E102" marking is manufacturer-specific, its electrical identity is clear: a non-polarized, high-frequency decoupling and filtering capacitor with stable performance from -55°C to +125°C.