PT4115B89E-B

PT4115B89E-B 30V, 1.2A Step-Down High Brightness LED Driver with 5000:1 Dimming

PT4115B89E-B Product Overview

The PT4115B89E-B is a continuous conduction mode inductive step-down converter from PowTech (CR-PowTech(Shanghai)), designed for driving single or multiple series-connected LEDs efficiently from a voltage source higher than the total LED chain voltage. This high-brightness LED driver operates from an input supply between 6V and 30V and provides an externally adjustable output current of up to 1.2A. Depending upon the supply voltage and external components, the PT4115 can provide more than 30 watts of output power.

The device includes the power switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. A dedicated DIM input accepts either a DC voltage or a wide range of pulsed dimming, supporting both analog and PWM dimming methods. The PT4115B89E-B is available in a SOT-89-5 package.

PT4115B89E-B Key Specifications

Input voltage range: 6V to 30V
Output current: Up to 1.2A
Switching frequency: 1MHz
Output current accuracy: ±5%
Efficiency: Up to 97%
Dimming methods: PWM and Analog
Dimming ratio: 5000:1
Topology: Step-down (buck)
Number of channels: 1
Internal switch: Built-in
Operating temperature: -40°C to +85°C
Package: SOT-89-5
Protection features: Over-temperature protection (OTP), LED open-circuit protection, built-in soft-start
Standby current: 95µA typical

PT4115B89E-B Key Advantages

The PT4115B89E-B offers high efficiency of up to 97%, making it an excellent choice for power-sensitive LED lighting applications. The wide 6V to 30V input voltage range provides flexibility for various power sources. The single DIM pin supports both analog and PWM dimming with a 5000:1 dimming ratio, enabling precise brightness control.

The high-side current sensing scheme uses an external resistor to set the nominal average output current with ±5% accuracy. The hysteretic control architecture requires no compensation, simplifying design and reducing external component count. The device includes inherent open-circuit LED protection and over-temperature protection, enhancing system reliability.

PT4115B89E-B Typical Applications

High-brightness LED lighting systems
Automotive LED lighting (tail lights, brake lights, turn signals)
Portable lighting devices (flashlights)
Residential LED lamps (ceiling lights, spotlights, downlights)
Commercial lighting (advertising backlighting, decorative fixtures)
Industrial equipment indicator lights
General-purpose LED driver applications

PT4115B89E-B Why Choose the PT4115B89E-B?

The PT4115B89E-B combines a 6V to 30V input range, 1.2A output current capability, 1MHz switching frequency, 5000:1 dimming ratio, and up to 97% efficiency in a compact SOT-89-5 package. Manufactured by PowTech (CR-PowTech(Shanghai)), a leading provider of LED driver solutions, it delivers reliable, efficient LED driving for a wide range of lighting applications. The simple single-pin dimming control, high-side current sensing, and comprehensive protection features make it an ideal choice for engineers designing high-brightness LED lighting systems where efficiency, reliability, and design simplicity are critical. The device is RoHS compliant and available in tape and reel packaging.