CRMICRO Primary Agent DC to DC Buck constant current drive IC PT4123CEESH
- Model：
- PT4123CEESH
- Brand：
- CRMICRO
- Batch No：
- PT4123C,PowTech,6‑60V 4A LED驱动,大功率LED恒流驱动IC
- Desc：
- PT4123C is a PowTech (CRMICRO) internal‑MOS buck LED constant‑current driver. It features 6‑60V input voltage and up to 4A maximum output current, supports PWM & analog dimming, and comes in the ESOP‑8 package. GSMicro is an authorized distributor with in
- Stock：
- 400000 只
6‑60V 4A Internal‑MOS Buck LED Constant‑Current Driver PT4123C｜PowTech CRMICRO｜GSMicro Authorized Distributor
Keywords: PT4123C | 6‑60V 4A LED Constant‑Current Driver | High‑Power PWM Analog Dimming LED Driver IC | PowTech
Product Overview: PT4123C is a PowTech CRMICRO buck LED constant‑current driver with internal power‑MOS operating in continuous conduction mode. It accepts 6‑60V input, max 4A output, supports analog / PWM dimming and DIM pin standby control. Available in ESOP‑8 package with exposed thermal pad. Suitable for high‑power LED lighting, industrial LED, outdoor LED modules, automotive lighting and security fill‑in lights. GSMicro is an authorized distributor with in‑stock inventory. Samples, datasheets and hardware application reference designs are available.
PT4123C is a 6‑60V buck constant‑current LED driver released by PowTech CRMICRO, integrating internal power MOSFET, designed for single or multiple series‑connected high‑power LEDs. It is well suited for industrial and automotive wide‑voltage power‑supply systems of 12V/24V/48V. Adopting high‑side current‑sensing architecture, the output current can be configured by external sense resistor, delivering maximum 4A output to drive LED loads up to tens of watts. Multi‑function DIM pin enables LED on‑off control, analog dimming and wide‑range PWM dimming. When DIM voltage drops below 0.3V, the IC shuts down and enters low‑power standby mode. Housed in ESOP‑8 package with exposed thermal pad for excellent heat dissipation. Widely used in indoor & outdoor high‑power LED lighting, industrial LED equipment, outdoor LED display modules, automotive LED lamps, security fill‑in lights, medical‑equipment LED lighting and other applications.
PT4123C sets average LED output current via sense resistor RS between VIN and CSN. The DIM pin supports 0.5V‑2.5V analog dimming and 100Hz‑20 kHz PWM dimming. When DIM voltage is lower than 0.3V, the IC disables output and enters low‑power standby mode. Built‑in comprehensive protections handle abnormal conditions such as LED open‑circuit and over‑temperature to improve system reliability.
PT4123C ordering part‑number: PT4123C, ESOP‑8 package, tape‑and‑reel packaging. Operating temperature ranges from ‑40℃ to 85℃, fit for industrial and automotive temperature environments.
⚡ Key Features
Continuous‑conduction‑mode buck architecture for stable driving, minimal external components, simplifies PCB layout and reduces BOM cost.
6V‑60V wide input‑voltage range, compatible with industrial and automotive power supplies, withstands voltage surges.
Integrated power MOSFET, max 4A output, supports tens‑watt‑class high‑power LED driving without external power devices.
Multi‑function DIM pin for hardware enable / disable, analog dimming and wide‑range high‑ratio PWM dimming.
High‑side current‑sensing architecture; output current flexibly configurable by external sense resistor.
Low‑level DIM trigger for micro‑amp standby mode to reduce system quiescent power consumption.
Built‑in multiple protections including LED open‑circuit and thermal shutdown to enhance system fault tolerance.
ESOP‑8 package with exposed thermal pad, excellent heat dissipation for continuous high‑power 4A operating conditions.
Compatible Replacement & Performance Comparison
PT4123C is an internal‑MOS high‑current buck constant‑current LED driver. Compared with PT4121 external‑MOS solution, PT4123C integrates power transistor on‑chip, eliminating external MOSFET to reduce BOM count and PCB layout workload. Compared with medium‑current internal‑MOS drivers such as PT4205S, PT4123C delivers higher 4A output current and 60V voltage rating targeting tens‑watt high‑power LED applications.
Many commercial high‑power LED drivers require external MOSFET with numerous peripheral components. PT4123C integrates power switch on‑chip while retaining high‑side sensing, dual‑mode dimming and standby functions. Its thermally‑optimized ESOP‑8 package is designed for high‑current heat dissipation, suitable for lighting and industrial projects pursuing compact high‑power‑density solutions.
GSMicro provides replacement‑scheme evaluation, sample testing and hardware technical support to help customers complete solution validation.
Typical Application Scenarios
Indoor & outdoor high‑power LED lighting: downlights, spotlights, streetlights, courtyard lights, landscape lights.
Industrial LED: industrial lighting, equipment indicator lamps, warning lamps, backlight modules.
Outdoor LED: LED display modules, advertising light boxes, outdoor light strings.
LED modules and high‑voltage LED strip drivers.
Automotive LED lamps, security fill‑in lights, special‑purpose medical‑equipment LED lighting.
Ordering Information
| Package | Temperature Range | Orderable Part Number | Packaging | Marking |
| ESOP‑8 | ‑40℃ ~ 85℃ | PT4123C | Tape and Reel Tape‑and‑reel packaging | PT4123C xxxxxX |
Key Electrical Parameters
| Parameter Category | Parameter Name | Value | Unit |
|---|---|---|---|
| Input & Output | Recommended Input Voltage | 6~60 | V |
| Input & Output | Maximum Output Current | 4 | A |
| Performance | Drive Architecture | Continuous‑conduction‑mode buck, internal power MOS | ‑ |
| Dimming | Analog Dimming Voltage Range | 0.5~2.5 | V |
| Dimming | PWM Dimming Frequency Range | 0.1~20 | kHz |
| Protection | Protection Features | LED open‑circuit, thermal shutdown protection | ‑ |
| Operating | Operating Temperature Range | ‑40~85 | ℃ |
| Standby | DIM‑triggered Standby | Output disabled when DIM＜0.3V | ‑ |
Typical Application Schematic
Pin Definition & Package Dimension Drawing
Refer to PT4123C official datasheet for full package dimensions. The ESOP‑8 device has exposed thermal pad. For 4A high‑power applications, the thermal pad must connect to large GND copper pour on PCB to lower thermal resistance and guarantee long‑term stable chip operation.
Operating Principle
PT4123C, together with power inductor L and sense resistor RS, forms a self‑oscillating buck constant‑current LED controller working in continuous‑conduction mode. At VIN power‑up, initial currents of inductor L and sense resistor RS are zero and LED output current equals zero. The internal comparator outputs high level and on‑chip power MOSFET turns on. Current flows from VIN through inductor L, sense resistor RS, LED load and internal power MOSFET to GND. Inductor current slew rate is determined by input voltage VIN, inductor value and LED forward voltage drop, generating sense differential voltage across RS. When sense voltage reaches threshold, internal MOSFET turns off and inductor free‑wheels via Schottky diode D. When inductor current falls to lower threshold, MOSFET turns on again. This oscillation loop stabilizes average LED output current.
High‑side current‑sensing combined with 1% precision sense resistor achieves high‑accuracy LED output‑current control.
PWM signals applied to DIM implement digital dimming. When DIM＜0.3V, internal MOSFET is disabled and LED output is fully shut down. Full‑scale output is enabled above 2.5V. DC input of 0.5V‑2.5V provides analog dimming. The DIM pin may be left floating for normal operation. Pulling DIM below 0.3V puts the IC into low‑power standby mode.
PT4123C integrates TSD thermal‑shutdown protection: junction‑temperature over‑limit triggers output shutdown; operation resumes automatically after temperature drops back. An external NTC thermistor may connect to DIM and place close to LED board to implement external LED thermal compensation for current reduction. ESOP‑8 thermal pad must connect to large GND copper pour on PCB to reduce thermal resistance. Built‑in LED open‑circuit protection places IC into safe state under load‑open fault to improve system fault tolerance.
Application Notes
Setting Average LED Current via External Sense Resistor RS
Average LED current is set by sense resistor RS placed between VIN‑CSN. Valid condition: DIM pin floating or DIM voltage＞2.5V and＜5V. RS defines maximum LED output current; actual LED output current can be scaled down via DIM pin. For 4A high‑current conditions, sufficient power‑rating margin must be reserved for sense‑resistor power dissipation.
Analog Dimming & High‑Ratio PWM Dimming
The DIM pin supports 0.5V‑2.5V analog dimming and 100Hz‑20 kHz PWM digital dimming. PWM dimming preserves LED chromaticity, ideal for brightness adjustment of lighting products. IC enters shutdown‑standby mode when DIM voltage falls below 0.3V.
External Component Selection Guidelines
Place low‑ESR input bypass capacitor close to VIN pin. Select Schottky free‑wheeling diode with ≥30% voltage‑and‑current derating. Inductor saturation‑current rating must exceed real peak inductor current; apply extra margin for 4A high‑current designs. Connect ESOP‑8 thermal pad to large GND copper pour to improve heat dissipation.
PCB Layout Recommendations
Mount sense resistor RS adjacent to VIN and CSN pins to minimize sensing error. Make high‑current power‑loop traces short and wide. Shorten switching‑node SW traces to reduce EMI radiation. Connect ESOP‑8 thermal pad to large GND copper pour. Place input bypass capacitor right next to VIN pin.
Frequently Asked Questions FAQ
Q1: How do I set the maximum LED output current for PT4123C?
A: The average LED output current is set by sense resistor RS between VIN‑CSN; output current depends on RS resistance value. Use 1% precision power‑type sense resistor and pay attention to resistor power‑rating selection for high‑power operating conditions.
Q2: What dimming modes are supported by DIM pin and what is the valid frequency range?
A: The DIM pin supports PWM digital dimming and 0.5V‑2.5V analog‑voltage dimming. IC enters low‑power standby when DIM＜0.3V. Recommended PWM dimming frequency range: 100Hz‑20 kHz. PWM dimming keeps LED chromaticity unchanged.
Q3: What advantages does PT4123C internal‑MOS architecture have versus external‑MOS LED‑driver ICs?
A: PT4123C integrates power MOSFET on‑chip, eliminating external MOSFET device, reducing BOM component count and PCB layout workload. It is suitable for high‑power LED projects pursuing simplified solution. Due to package limitation, proper thermal copper pouring for ESOP‑8 thermal pad is mandatory in hardware design.
Q4: PT4123C is only available in ESOP‑8 package, what shall I pay attention to for layout and thermal design?
A: PT4123C comes only in ESOP‑8 package and generates considerable heat under 4A continuous‑current operation. On PCB, the exposed thermal pad must connect to large GND copper area with multiple thermal vias to inner ground plane for low thermal resistance and reliable long‑term chip operation.
Q5: Will PT4123C get damaged if LED load becomes open‑circuited?
A: The IC integrates LED open‑circuit protection. It enters low‑power safe state without device damage under fault condition. Normal operation resumes automatically after fault is cleared and load is restored.
Q6: Is PT4123C suitable for automotive 12V / 24V systems?
A: Maximum input voltage reaches 6‑60V to withstand automotive supply surges and is compatible with 12V and 24V automotive power systems. Proper voltage derating for peripheral components and thorough PCB thermal evaluation are required in hardware design.
About GSMicro Semiconductor
GSMicro Semiconductor (Shenzhen) Co., Ltd. (hereinafter referred to as GSMicro) was founded in 2023. Its predecessor LUMENCHIP was established in 2010. Headquartered in Shenzhen‑China’s tech hub, GSMicro is a leading analog‑chip integrated‑service brand focusing on mixed‑signal chip implementation and advancing green intelligent‑technology development.
GSMicro combines worldwide resources and channels and breaks traditional independent‑distribution & agency business models. It implements a dual‑mode solution integrating hybrid agency & distribution, market analysis & forecasting, technical‑solution service and one‑stop complete‑supply services. Agency product lines co‑exist with self‑owned brands; distribution business co‑exists with complete‑set supply services, building a distinctive business system. Our mission is to serve customers whole‑heartedly, meet global‑customer requirements, deliver innovative customized products and services, help customers achieve sustainable profit and success and shape their future markets. We communicate deeply with customers, provide unique design insights and deliver competitive complete solutions and products. With in‑house R&D capability, we provide power‑management and intelligent‑control solutions for leading enterprises across electronic sub‑sectors and rank high in agency‑distribution and solution‑service industries.
GSMicro maintains comprehensive product portfolios covering MCU, power‑management ICs, AI chips, signal‑chain chips and power devices. Product lines cover signal processing, voice wake‑up, speech recognition, voiceprint recognition, speech synthesis, knowledge graph, natural‑language processing and intelligent dialogue. With strong marketing capabilities and rich market‑operation experience, our key authorized partners include DONGWOON (Korea), CRMICRO (PowTech), CRHJ, APM, COOLSEMI, ANHI, Reasunos, OCX, MassChip, XLSEMI, NSIWAY, EGmicro, Ruimeng Technology, ChipWays, AISPEECH, Aerosemi and more.
GSMicro adheres to corporate values: "Strive‑Oriented, Customer‑Centered, Value‑Oriented Contribution". We focus on technical implementation of agency semiconductor products and drive sustainable development of green‑intelligent technologies, leading global semiconductor niche markets in distribution and application‑solution services. Official Website: https://www.gs‑micro.com/en‑us
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