Exceeding these values will destroy the IC. These are non-recoverable limits.
| Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Input Voltage | VIN | 45 (60 for -H variant) | V | | Switch Output Voltage | VSW | VIN + 0.5 | V | | Feedback Voltage | VFB | -0.3 to +7 | V | | Peak Switch Current | ISW(peak) | 4.5 | A | | Power Dissipation (Tc=25°C) | PD | 25 | W | | Operating Temperature | Topr | -20 to +125 | °C | | Storage Temperature | Tstg | -40 to +150 | °C |
Most SN51DP datasheets include:
Missing in some versions:
The SN51DP is available in a small package, often a TSSOP (Thin Shrink Small-Outline Package) or similar, making it suitable for compact designs and portable equipment. sn51dp datasheet
A: The "-H" suffix indicates a higher input voltage rating – typically 60V instead of 45V. All other parameters remain the same.
Before diving into the datasheet details, let's decode the nomenclature: Exceeding these values will destroy the IC
The SN51DP is generally a switching regulator IC capable of handling medium to high power. It is most commonly found in step-down (buck) converter topologies, CRT televisions (for horizontal deflection power), and industrial power modules.
Understanding the pinout is the primary reason engineers search for the SN51DP datasheet. The pin assignment (seen from the front, pins facing down) is as follows: Most SN51DP datasheets include:
| Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | VIN | Input voltage (unregulated DC supply). Bypass with a low-ESR capacitor close to this pin. | | 2 | SW (Output) | Switching node – connects to the inductor and catch diode. Handles high current. | | 3 | GND | Ground reference. Must be connected to the system ground plane. | | 4 | FB (Feedback) | Voltage feedback input. Connected to a resistor divider from the output to set the desired voltage. | | 5 | COMP (Compensation) | Frequency compensation pin. A capacitor and resistor network to ground stabilizes the control loop. |
Note: Some variants may swap pins 4 and 5 or include an enable function. Always verify with a multimeter and known schematic.