Enable pin. High enables the IC, Low sets it to standby. 4. Typical Application Circuit
These components are typically rated MSL 1 , meaning they have an unlimited floor life at ≤30°C/85% RH, but always check the specific reel packaging.
: Prevents component destruction during an overload condition. 9e102 datasheet
According to the BD9E102FJ datasheet provided by ROHM , the key electrical characteristics are as follows: Specification 7.0 V to 26 V Output Current ( IOUTcap I sub cap O cap U cap T end-sub ) 1.0 A (Max) Output Voltage ( VOUTcap V sub cap O cap U cap T end-sub ) Adjustable (typically configured for 5V, 1A) Switching Frequency 484 kHz - 656 kHz Standby Current Very low (due to SLLM) Control System Current Mode Package Type 3. Pin Configuration and Functions
| Parameter | Min | Typ | Max | Unit | Notes | | :--- | :--- | :--- | :--- | :--- | :--- | | | 7.0 | – | 26 | V | Operating range | | Output Voltage (VOUT) | 1.0 | – | 18.2 | V | Adjustable (via external resistors) | | Output Current (IOUT) | – | – | 1.0 | A | Continuous rating | | Switching Frequency | – | 570 | 656 | kHz | Fixed, typical value | | High-Side FET On-Resistance | – | 250 | – | mΩ | Integrated power MOSFET | | Low-Side FET On-Resistance | – | 200 | – | mΩ | Integrated synchronous MOSFET | | Reference Voltage (VFB) | – | 0.8 | 0.816 | V | Internal feedback reference | | Efficiency at Light Load | – | 80 | – | % | At IOUT = 10mA (typical) | | Operating Temp. (TA) | -40 | – | +85 | °C | Industrial temperature range | | Quiescent Current (No Switch) | – | 500 | – | µA | Typical value | | Package Type | – | – | – | – | SOP-J8 (or SOIC-8) | | Dimensions (W × D × H) | – | 4.9×6.0×1.65 | – | mm | Package dimensions | Enable pin
– Common reference ground for the control circuitry and power stage.
Often found in 1210 (3225 Metric) or 2220 (5650 Metric) surface-mount footprints. Pin Configuration and Functions | Parameter | Min
:
[Input 19V/24V] ---> [ 2. VIN Pin ] | [ 9E102 Buck IC ] <--- [ 7. EN Pin ] (System Logic Control) | [Output 5V/3.3V] <-- [ 3. SW Pin ] ---> [ Inductor ] ---> [ Filter Cap ] ---> Load | [ 5. FB Pin Resistors ] Troubleshooting Steps