Sn51dp Datasheet Jun 2026

The datasheet primary application is buck. While theoretically possible, no official reference design exists for boost. Use a dedicated boost controller instead.

Current setting benchmark terminal; calibrates base LED string current. REF Internal reference voltage configuration output. 8 FB

The SN51DP has the following electrical characteristics: sn51dp datasheet

According to internal block diagrams from older datasheets, the SN51DP uses a bipolar junction transistor (BJT) as the power switch, not a MOSFET. This explains its higher saturation voltage (0.8V typical) compared to modern MOSFET-based converters.

| Parameter | Symbol | Min | Typical | Max | Unit | Description | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Operating Supply Voltage | VDD | 1.6 | 3.3 | 5.5 | V | Logic supply for the IC's internal circuitry. | | Power Input Voltage | VIN | 4.5 | 12 | 28 | V | Input supply for the boost converter stage. | | Output Voltage | VOUT | 0.8 | - | 72 | V | Adjustable boosted output for LED strings (Max dependent on design). | | Max Load Current | ILoad | - | - | 20 | mA | Current per control channel (control side). | | Quiescent Current | IQ | - | 1.5 | - | μA | Current consumed by IC with no load (Standby). | | Operating Temp | Toper | -40 | - | 85 | °C | Functional temperature range of the device. | | Storage Temp | Tstg | -65 | - | 150 | °C | Non-operating storage temperature range. | The datasheet primary application is buck

| Parameter | Conditions | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | Input Voltage Range | | 8 | | 45 | V | | Quiescent Current | VFB = 0V, No switching | | 5 | 8 | mA | | Shutdown Current | VIN only | | 100 | 200 | µA | | Reference Voltage | VFB pin | 1.20 | 1.23 | 1.26 | V | | Oscillator Frequency | | 45 | 60 | 75 | kHz | | Switch Saturation Voltage | ISW = 2A | | 0.8 | 1.2 | V | | Switch Leakage Current | VSW = 45V | | | 100 | µA | | Current Limit Threshold | Duty cycle < 50% | 3.5 | 4.0 | 4.5 | A | | Thermal Shutdown Temp | | | 150 | | °C |

The is a specialized, high-performance integrated circuit (IC) primarily used as a backlight driver in LED TV and LCD display power supply boards. Known for its robustness in driving LED backlights, this chip is frequently utilized in Vu LED TVs and other display systems, ensuring stable illumination and backlight management. It is often housed in a small 10-pin package, typically MSOP-10 or SOP-10, making it suitable for compact circuit designs. This explains its higher saturation voltage (0

Understanding the pin mapping is critical for troubleshooting fault lines or checking voltage references during TV diagnostics. Below is the 10-pin functional breakdown compiled from the standard SN51DP Application Diagram on Electronica Max :

– Operating parameter threshold setting. Configures reference baselines via precision external grounding resistors.