CRMICRO Primary Agent DC to DC Buck constant current drive IC PT4115BE89E
- Model：
- PT4115BE89E
- Brand：
- CRMICRO
- Batch No：
- PT4115BE89E,PT4115BEESH
- Desc：
- CRMICRO Brand PT4115BE89E
- Stock：
- 0 PCS
36V/1.2A buck high dimming ratio LED constant current driver PT4115B(Order model：PT4115BE89E/PT4115BEESH)
Product Overview of PT4115BE89E/PT4115BEESH
PT4115BE89E/PT4115BEESH is a step-down constant current source with continuous inductor current conduction mode, used to drive one or more series connected LEDs.
PT4115BE89E/PT4115BEESH has an input voltage range from 6V to 36V (with a maximum withstand voltage of 40V) and an adjustable output current of up to 1.2A. According to different input voltages and external devices, PT4115BE89E/PT4115BEESH can drive LEDs up to tens of watts.
PT4115BE89E/PT4115BEESH has a built-in power switch and uses high-end current sampling to set the average LED current. It can accept analog dimming and a wide range of PWM dimming through the DIM pin. When the voltage of the DIM is low, the power switch is turned off, and PT4115BE89E/PT4115BEESH enters a standby state with extremely low working current.
Main features of PT4115BE89E/PT4115BEESH
⚫Very few external components
⚫Wide input voltage range: from 6V to 36V
⚫Up to 97% efficiency
⚫The maximum output current of the PT4115BE89E/PT4115BEESH chip is 1.2A
⚫Reuse DIM pins for LED switching, analog dimming, and PWM dimming
⚫Up to 1MHz switching frequency
⚫PT4115BE89E/PT4115BEESH step-down constant current drive chip with 3% output current accuracy
⚫PT4115BE89E/PT4115BEESH driver chip with built-in LED open circuit natural protection
⚫PT4115BE89E/PT4115BEESH constant current drive IC with built-in RCS open circuit protection
⚫PT4115BE89E/PT4115BEESH constant current drive chip adopts high-end current sampling detection
⚫PT4115BE89E/PT4115BEESH chip hysteresis control: no compensation required
⚫PT4115BE89E/PT4115BEESH Output Adjustable Constant Current Control Method
⚫PT4115BE89E/PT4115BEESH has temperature protection function
Typical applications of PT4115BE89E/PT4115BEESH
⚫Low voltage LED spotlights replace halogen lights
⚫Car LED lights
⚫LED backup light
⚫LED signal light
Pin arrangement of PT4115BE89E/PT4115BEESH
Pin function of PT4115BE89E/PT4115BEESH
| Pin number | Pin name | Function Description | |
| SOT89-5 | ESOP8 | ||
| 1 | 3 | SW | Switch output SW is the drain terminal of the internal N-MOS |
| 2 | 6，7 | GND | Ground the signal and power supply directly to the ground plane |
| 3 | 8 | DIM | Logic level dimming input DIM is low, turn off the current and adjust the machine DIM is high, turn on the current regulator |
| 4 | 1 | CSN | Current sampling terminal, sampling resistor connected between CSN and VIN terminals |
| 5 | 2 | VIN | The power input terminal must be connected to a nearby bypass capacitor |
| - | 4，5 | NC | NC |
| - | Exposed PAD | Heat dissipation end, attached to the PCB board to reduce thermal resistance, this pad is connected to the GND on the PCB, and floating is prohibited | |
Typical application circuit diagram of PT4115BE89E/PT4115BEESH
PT4115BE89E/PT4115BEESH 36V/1.2A Buck High-Dimming-Ratio LED Constant Current Driver
Product Overview
The PT4115BE89E/PT4115BEESH is a step-down constant-current LED driver operating in continuous inductor current mode, designed to drive single or multiple series-connected LEDs.
Input Voltage Range: 6V–36V (40V max withstand)
Output Current: Adjustable up to 1.2A
Power Capacity: Supports high-power LED arrays (up to tens of watts) based on input voltage and external components.
Key Features
✔ Minimal External Components – Simplified design
✔ Wide Input Range: 6V–36V (40V tolerant)
✔ High Efficiency: Up to 97%
✔ Precision Current Control: ±3% output accuracy
✔ Flexible Dimming:
Analog/PWM Dimming via DIM pin (supports PWM frequencies up to 1MHz)
Ultra-Low Standby Current when DIM is low
✔ Integrated Protections:
LED Open-Circuit Protection
Current-Sense (RCS) Open-Circuit Protection
Thermal Shutdown
✔ Advanced Control:
High-side current sensing
Hysteretic control (no compensation needed)
Adjustable constant-current output
Typical Applications
✔ Low-voltage LED spotlights (halogen replacements)
✔ Automotive LED lighting
✔ LED emergency/backup lights
✔ LED signal indicators
Why Choose PT4115BE89E/PT4115BEESH?
✅ Compact & Robust – Single-chip solution with built-in protections
✅ Industry-Leading Dimming – Supports analog/PWM for flicker-free performance
✅ Optimized for Automotive/Industrial Use – Wide voltage range and thermal resilience
(For full specifications, refer to the PT4115BE89E/PT4115BEESH datasheet or contact our technical team.)
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