LAN1168ED Automotive LED Driver Solution | 200V Withstand Linear Driver, Zero EMI Interference, No Dead Lamp When Cooling Fan Malfunction, 24V Truck Dedicated Constant Current IC, 36W Linear Headlight Driver for 24V Commercial Vehicles, Industry-first 200V High Voltage Linear Driver Pass ISO7637-5a Without Extra TVS Protection
Keywords: LAN1168ED, LAN1168ED automotive LED driver, automotive constant current LED IC, 200V headlight driver, zero EMI LED driver, no dead lamp on fan failure, 24V truck lighting solution, 40W linear LED driver, GSMicro
Product Key Parameter Summary: The LAN1168ED is a high-withstand linear constant current LED driver IC engineered exclusively for 24V trucks and high-voltage automotive lighting. It features 200V maximum input withstand voltage, only one external CS resistor needed for peripheral circuit, zero EMI emission and non-blackout protection under cooling fan breakdown. Integrated 5A/200V internal power MOSFET, max output current up to 1.2A, 0.9V dropout voltage @1A load, built-in 120°C thermal shutdown protection (threshold adjustable via external resistor). High-voltage foldback current protection activates at 15V when SEL pin is grounded. Packaged in ESOP8, ideally suited for 24V truck lamps, passenger vehicle headlights and e-bike lights, compliant with ISO7637-5a surge test without supplementary TVS components.
LAN1168ED Product Overview
The LAN1168ED is an adjustable thermal threshold high-withstand high-current linear LED driver IC, supporting LED drive operation across 5V~200V input voltage range. A complete constant-current drive circuit is realized with merely one external CS sampling resistor.
Default internal thermal protection threshold of LAN1168ED is 130°C, which can be modified by external fixed resistor; adopting external NTC thermistor enables precise real-time junction temperature monitoring of LED chips.
Integrated 5A/200V power MOSFET inside LAN1168ED, maximum practical output current reaches 1.2A; low-dropout circuit design delivers only 0.9V voltage drop under 1A output current.
Optional built-in overvoltage foldback protection circuit reduces output current automatically once input voltage exceeds 15V to avoid IC burnout from abnormal high input voltage.
Available in ESOP8 package with optimized thermal dissipation, perfectly matching rigorous 24V high-voltage operating conditions for commercial vehicles.
LAN1168ED Key Features
Minimal BOM cost, single external resistor sets regulated output current
Customizable LED junction temperature control, stable performance under high-temperature automotive underhood environment
Embedded high-current power MOSFET eliminates extra discrete power components
Up to 1.2A rated output current to satisfy 40W automotive headlight driving demand
15V-triggered overvoltage foldback protection prevents IC damage from vehicle power surge
ESOP8 surface-mount package with automotive-grade high reliability design
LAN1168ED Typical Applications
Specially optimized for 24V truck headlights, passenger car LED lamps, electric two-wheeler & motorcycle lighting; also applicable to LED flashlights, desk lamps, mining lamps, rechargeable floodlights and various DC-powered LED lighting fixtures, compatible with PWM dimming control power supply.
LAN1168ED Typical Application Schematic
LAN1168ED Ordering Information
| Part Number | Package | Marking | Packaging |
| LAN1168ED | ESOP8 | LAN1168ED YYYYWW | Tape & Reel, 4000pcs/reel |
LAN1168ED Pin Definition
| Pin No. | Pin Name | Function Description |
| 1 | VIN | IC power supply input terminal |
| 2/7 | GND | IC ground, pins internally shorted together |
| 3 | CS | Current sense feedback pin for constant current setting |
| 4 | S | Internal power MOSFET source terminal |
| 5 | DR | Constant-current LED driving output pin |
| 6 | ROTP | Thermal shutdown threshold adjustment pin |
| 8 | SEL | Overvoltage foldback enable pin; connect to SGND to activate 15V current reduction protection |
| Exposed Pad | DR | LED driver output pad, electrically tied to pin 5 for enhanced heat dissipation |
LAN1168ED Absolute Maximum Ratings
| Symbol | Parameter | Min. | Max. | Unit |
| VIN_MAX | Maximum Input Supply Voltage | -0.3 | 200 | V |
| CS/DIM_MAX | Maximum CS Pin Voltage | -0.3 | 6 | V |
| DR_MAX | DR Pin Withstand Voltage | -0.3 | 200 | V |
| TA | Operating Ambient Temperature | -20 | 150 | ℃ |
| TSTG | Storage Temperature Range | -40 | 150 | ℃ |
| P_MAX | Maximum Power Dissipation | — | 6 | W |
| Rthjd | Junction-to-Case Thermal Resistance | — | 5 | ℃/W |
| ESD | Human Body Model ESD Rating | — | 2000 | V |
LAN1168ED Recommended Operating Power Ratings
| Input Voltage | LED Output Voltage | Output Current |
| 9-15V | 9V | 1.2A |
| 24-30V | 24V | 0.8A |
| 24V±20% | 18V | 0.7A |
| 48V±10% | 36V | 0.4A |
LAN1168ED Electrical Characteristics (VIN=12V, TA=25℃)
| Symbol | Parameter Description | Test Condition | Typical Value | Unit |
| Electrical Supply Specifications |
| OP VDD | Operating Input Voltage Range | — | 7~200 | V |
| I VDD | Quiescent Supply Current | VIN=12V | 180 | μA |
| Current Sense Section |
| VREF_CS | Internal CS Reference Voltage | Io=500mA | 300 | mV |
| ΔIo | Output Current Regulation Accuracy | Io=500mA | ±4% | — |
| Power Drive Characteristics |
| VDS_MOS | Internal MOSFET Drain-Source Voltage Rating | — | 200 | V |
| RDS_ON | MOSFET On-Resistance | Io=1A | 600 | mΩ |
| IOUT | Maximum Regulated Output Current | — | 1.2 | A |
| Thermal Protection Parameters |
| T_OTP | Default Thermal Shutdown Temperature | — | 120 | ℃ |
LAN1168ED Power-up & Operation Principle
Supply power is fed into VIN pin; IC initiates normal operation once input voltage exceeds 5V. Output constant current formula: Io = 0.3V ÷ Rcs.
Overvoltage Foldback Current Application (Surge Protection Setup)
Overvoltage foldback function remains disabled when SEL pin is floating; grounding SEL pin to SGND enables 15V overvoltage protection. Output current automatically decreases proportionally with rising input voltage above 15V to prevent overheat damage to IC and LED loads.
Reverse Polarity Protection Implementation
Reversed input polarity will cause permanent IC damage; series an A7 rectifier diode or high-current Schottky diode at VIN input terminal for anti-reverse connection protection.
24V Typical Application Circuit with Overvoltage Foldback Protection
Adjustable Thermal Protection & LED Temperature Control
IC automatically starts current derating at internal default 130°C junction temperature threshold. Users can shift OTP trigger point via external fixed resistor; replacing setting resistor with NTC thermistor realizes closed-loop real-time LED chip temperature regulation.
LAN1168ED PCB Layout Design Guidelines
LAN1168ED is packaged in ESOP8; exposed thermal pad must be fully bonded onto aluminum substrate with thermal grease to avoid overheating failure.
Combine adjustable thermal function with PCB thermal layout design to confine LED operating temperature within safe specification range.
Widen copper trace width for high-current paths especially MOS source terminal and power input/output routes to guarantee long-term stable IC performance.
GSMicro Linear Automotive Headlight Driver IC Specification Comparison Chart
| Part Number | Package | Max Withstand Voltage | Default OTP Temp | Matched LED String Voltage | Max Practical Output Current |
|---|
| LAN1032AT | SOT89-5L | 48V | 140℃ | 9V | 0.6A@Vin=13V Vout=9V |
| LAN1032E | ESOP8 | 48V | 140℃ | 9V | 0.8A@Vin=13V Vout=9V |
| LAN1161ED | ESOP8 | 100V | 120℃ | 12V | 1.2A@Vin=13.5V Vout=12V |
| LAN1163E | ESOP8 | 100V | 135℃ | 12V | 1.2A@Vin=13.5V Vout=12V |
| LAN1165ED | ESOP8 | 100V | 120℃ | 12V | 2A@Vin=13.5V Vout=12V |
| LAN1165E | ESOP8 | 100V | 135℃ | 12V | 2A@Vin=13.5V Vout=12V |
| LAN1166ED | ESOP8 | 100V | 120℃ | 12V | 4A@Vin=13.5V Vout=12V |
| LAN1166E | ESOP8 | 100V | 135℃ | 12V | 4A@Vin=13.5V Vout=12V |
| LAN1168ED | ESOP8 | 200V | 120℃ | 24V | 1.2A@Vin=27V Vout=24V |
| LAN1053A | ESOP8 | 100V | 135℃ | 9V | 1.2A@Vin=13.5V Vout=9V |
| LAN1058A | ESOP8 | 200V | 135℃ | 24V | 1.2A@Vin=27V Vout=24V |
Supplementary Notes
① Models without complete datasheet can adopt this document as official specification. Standard versions are pre-configured with fixed overvoltage foldback protection which cannot be modified externally.
② Output current is calculated by formula Io=0.3V÷Rcs; product warranty follows recommended application parameters. Derate operating current down to 80% of max rating for premium-grade automotive lamp design.
③ Suffix Definition: E = ESOP8 package with 135°C OTP threshold; ED = 120°C thermal shutdown for 12V/24V automotive lamp solution; A = high-power variant customized for 9V LED strings.
④ 12V passenger car headlights prefer ED low-temperature protection series; LAN1168ED is top selection for 24V commercial truck lighting featuring superior surge immunity and thermal performance. Derate LED working temperature by 10~15°C for long-haul vehicle applications.
⑤ High-power 9V LED application requires 2W copper-core MCPCB with insulated IC mounting area and thermally-isolated LED pads layout.
LAN1168ED Frequently Asked Questions (FAQ)
Q1: Can LAN1168ED directly replace PT4115 or OC7102C drop-in?
- A: No pin-to-pin compatible replacement due to different pin assignment. After minor PCB revision, it only requires single CS sampling resistor, no inductor needed and zero EMI radiation, ideal for high-voltage 24V truck lamp application.
Q2: Will headlight fully turn off if cooling fan stops working?
- A: No complete blackout. ED version features built-in 120°C thermal foldback protection; IC gradually cuts down output current under overheat condition to keep LED dimly lit for driving safety.
Q3: How to set constant output current? What is calculation formula?
- A: Configure output current via single CS-to-GND sampling resistor. Calculation: Iout = 0.3V / Rcs. For 1.2A target output, Rcs = 0.3V / 1.2A = 0.25Ω.
Q4: What is default thermal shutdown point & adjustment method?
- A: LAN1168ED ED variant default OTP at 120°C. Adjust protection threshold via external resistor on ROTP pin; install NTC thermistor for real-time LED junction temperature closed-loop control.
Q5: How to activate overvoltage foldback protection & its benefits?
- A: Tie SEL pin to SGND to enable 15V OVP foldback. Output current declines automatically once input exceeds 15V, protecting IC and LED array against vehicle electrical system voltage spike damage.
Q6: Rated 200V withstand, is LAN1168ED usable on 48V system?
- A: Applicable for 48V input system; control power dissipation via voltage drop management, recommend pairing with 36V LED string and limit operating current ≤0.4A as specified in recommended power table.
Q7: Thermal requirement of ESOP8 package? Design tips for 24V truck lamp project?
- A: Exposed pad must be firmly attached to aluminum PCB substrate with thermal compound. Ground SEL pin to enable OVP for 24V truck lamp, reinforce high-current copper traces for reliable long-term operation.
Q8: How to request free samples, lead time & bulk packaging info?
- A: Contact our sales team via phone +86 18018703531 or WhatsApp/Wechat gsmicro_semi (remark: LAN1168ED) for free engineering samples. Bulk production packed in tape&reel with 4000pcs per reel, standard lead time 2~4 weeks.
Company Profile
GSMicro Semiconductor (Shenzhen) Co., Ltd., formerly known as LUMENCHIP founded in 2010 and officially incorporated in 2023 with headquarters in Shenzhen China, is a leading analog IC developer focusing on mixed-signal chip R&D, customized solution design and green intelligent semiconductor technology.
Integrating authorized semiconductor distribution, market analysis, technical design-in and one-stop component sourcing service, GSMicro runs self-owned IC brand plus multi-brand agency business to deliver cost-effective total power management & control solutions for global clients.
Full product portfolio covers MCU, power management IC, AI processing chip, signal chain IC and discrete power devices, widely deployed in audio signal processing, voice wake-up, speech recognition, biometric voiceprint identification and smart interactive electronics. Authorized partner brands include DONGWOON(Korea), CR Micro, Huajing Micro, Yongyuan Micro, Powtech Semiconductor, Anhai Semi, Ruisen Semi, OCX Semiconductor, ZXyuan, Xinlong Semi, Zhixin Semi, Natlinear, Yijing Semi, Ruimeng Tech, AISHENG and Hangtian Minxin etc.
Adhering to corporate philosophy: Employee-oriented, Customer-centric, Value-driven, GSMicro continuously accelerates semiconductor technology commercialization and eco-friendly intelligent innovation, ranking top tier in specialized automotive power IC distribution and solution service worldwide.
Feel free to contact our sales for bulk pricing and free engineering samples via phone: +86 18018703531 or Wechat/WhatsApp: gsmicro_semi (remark LAN1168ED).
