LAN1161ED LED Driver IC | 12V Automotive LED Constant Current Solution | No EMI, No Dead Lamp on Cooling Fan Failure
Core Advantages of LAN1161ED: Dedicated constant current driver for 12V auto lamps | Zero EMI interference | Lamp keeps dim instead of shutdown upon fan breakdown | 15V overvoltage fold-back protection | 120℃ thermal shutdown protection | Integrated 3A/100V Power MOSFET | Only 2 external resistors needed | ESOP8 Package
Keywords:LAN1161ED, LAN1161ED automotive LED driver, automotive constant current LED driver IC, low EMI LED driver, no dead lamp after fan fault, 12V car headlight driver IC, GSMicro Semiconductor
Product Parameter Summary: Developed by GSMicro, LAN1161ED is a low dropout constant current driver IC exclusively designed for 12V automotive LED lamps. It features minimal BOM components and zero EMI noise, and avoids full lamp outage even when cooling fan malfunctions. Built-in 120℃ OTP protection, 3A/100V internal power MOSFET and 15V input overvoltage fold-back protection; max 1.2A output current with merely 0.6V dropout voltage at rated load. Widely deployed in automotive lamps, e-bike lights and general DC LED lighting, it is a premium reliable driver option for vehicle lighting systems.
LAN1161ED Product Overview
LAN1161ED is a low dropout constant current IC customized for 12V LED lamps. A complete constant current circuit can be configured with only two external resistors, delivering simplified circuitry, EMI-free operation and outstanding reliability with no full lamp blackout caused by radiator fan failure.
Equipped with built-in 120℃ over-temperature protection circuit, LAN1161ED limits LED chip temperature below 130℃ under various heat dissipation conditions to guarantee long-term stable operation.
Integrated with 3A/100V power MOSFET, the device supports up to 1.2A practical output current. Its low-dropout architecture only generates 0.6V voltage drop under 1.2A working current for lower power dissipation and higher conversion efficiency.
Optional internal overvoltage protection automatically reduces output current once input voltage hits 15V to prevent IC and LED burnout from automotive power surge fluctuation; available in thermally enhanced ESOP8 package.
LAN1161ED Key Features
Ultra few peripheral components simplify PCB design and boost mass production efficiency
Flexible LED thermal regulation to match diverse heat sink layout and ambient conditions
Embedded high-current power MOSFET eliminates cost and PCB space for discrete external MOSFET
Maximum 1.2A output current meets high-power automotive lighting driving requirements
Built-in 15V input overvoltage fold-back protection safeguards components against high voltage damage
ESOP8 package with superior thermal performance to adapt high-temperature under-hood automotive environment
LAN1161ED Application Fields
Automobile headlight, taillight, marker lamp, motorcycle lamp, electric bicycle lamp and all kinds of vehicle-mounted LED lighting
LED flashlight, desk lamp, mining lamp, rechargeable floodlight and general DC-powered LED illumination products
PWM dimmable power supply, industrial LED control module and high-reliability constant-current driving system for automotive electronics
LAN1161ED Typical Application Schematic
LAN1161ED Ordering Information
LAN1161ED Part Number & Package Specification Table
| Part Number | Package | Marking Code | Packaging Type |
| LAN1161ED | ESOP8 | LAN1161ED
HAYYWW | Tape & Reel, 4000pcs/reel |
LAN1161ED Pin Definition
| Pin No./Tab | Symbol | Function Description |
| 1 | VIN | Power supply input for LAN1161ED |
| 2 | GND | IC power ground |
| 3 | CS | Current sense pin for output current setting |
| 4 | S | Internal MOSFET source terminal |
| 5 | DR | Constant current output, connect to cathode of LED string |
| 6 | HLT/NC | No connect pin, thermal grade selection |
| 7 | SGND/NC | No connect / signal ground pin |
| 8 | SEL/NC | No connect pin, overvoltage protection option setting |
| Exposed Pad | DR | LED driver output, internally connected with Pin5 |
LAN1161ED Recommended Operating Power Rating
| Input Voltage | Output Voltage | Output Current |
| 12V | 9V | Not Recommended |
| 13.5V | 12V | 1.2A |
| 27V | 24V | Not Recommended |
LAN1161ED Electrical Specifications
| Symbol | Parameter Description | Test Condition | Typical Value | Unit |
| OP_VDD | Operating Input Voltage Range | — | 5-100 | V |
| I_VDD | Quiescent Supply Current | VIN=12V | 180 | μA |
| VREF_CS | Current Sense Reference Voltage | Io=500mA | 300 | mV |
| RDS_ON | Internal MOSFET On-Resistance | Io=1A | 200 | mΩ |
| IOUT | Max Continuous Output Current | — | 1.2 | A |
GSMicro Linear Automotive Headlight Driver IC Parameter Comparison
| Part Number | Package | Voltage Rating | OTP Cutoff Temp | Rated LED 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 |
| LAN1053A | ESOP8 | 100V | 135℃ | 9V | 1.2A@Vin=13V Vout=9V |
| LAN1058A | ESOP8 | 200V | 135℃ | 24V | 1.2A@Vin=27V Vout=24V |
| 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 | 2.5A@Vin=13.5V Vout=12V |
| LAN1165E | ESOP8 | 100V | 135℃ | 12V | 2.5A@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 |
LAN1161ED Competitive Advantages & Drop-in Replacement Comparison
1. EMI-free operation, no external inductor & capacitor required, fully compliant with automotive EMC standards
2. Gradual current foldback under over-temperature instead of full lamp shutdown for improved driving safety when cooling fan fails
3. Dual protection design: built-in 15V overvoltage protection plus 120℃ thermal shutdown protection
4. Only two external resistors cut down total BOM cost and improve finished product yield rate
5. Low 0.6V dropout voltage @1.2A working load reduces heat generation and stabilizes LED luminous flux
LAN1161ED Frequently Asked Questions(FAQ)
Q1: Can LAN1161ED directly pin-to-pin replace PT4115 or OC7102C?
- A: Direct pin-to-pin replacement is unavailable due to different pin assignment; PCB modification is needed. After redesign, inductor can be removed for simpler BOM, zero EMI interference and enhanced long-term reliability.
Q2: Will LED lamp turn off completely once cooling fan stops working?
- A: No. Internal 120℃ OTP circuit gradually decreases output current under overheat condition to keep LED dimly lit rather than blackout for driving safety.
Q3: How to set output current? What is the calculation formula?
- A: Output current is configured by single current sense resistor connected between CS pin and GND. Formula: Iout = 0.3V / Rcs. For target 1.2A output, Rcs=0.3V/1.2A=0.25Ω.
Q4: What is OTP threshold? Difference between ED suffix and E suffix?
- A: LAN1161ED features 120℃ thermal shutdown temperature; E-version (LAN1161E) is set at 135℃ OTP point. ED variant is optimized for sealed 12V automotive headlight assembly with superior long-term stability.
Q5: How to apply free samples? Lead time & packaging info for bulk order?
- A: Contact our sales via Phone +86 18018703531 or WhatsApp/WeChat gsmicro_semi(Remark: LAN1161ED) for free samples. Bulk goods are packed in tape & reel with 4000pcs per reel, standard lead time: 2~4 weeks.
Q6: What is IC input voltage range? Is it applicable for 24V vehicle system?
- A: Operating voltage spans 5V~100V while optimized for 12V LED strings. For 24V automotive system, select LAN1168ED instead to avoid excessive dropout and overheating risk.
Company Introduction
GSMicro Semiconductor (Shenzhen) Co., Ltd. specializes in mixed-signal IC and power management solution development, one of China’s leading manufacturers of automotive LED driver IC. Main product portfolio includes linear constant-current regulators, auto lamp driver IC and wide-input constant current solutions widely adopted in vehicle lighting, industrial control and general LED illumination industries.
