Thông số kỹ thuật
MAX20051AUD/V+ is an AEC-Q100 automotive-grade synchronous buck high-brightness LED driver from Analog Devices (Maxim Integrated), suffix AUD/V+ stands for 14-TSSOP-EP exposed thermal pad tray packaging, dedicated to automotive exterior lighting with wide 4.5V–65V input and 2A continuous LED driving capacity.
👉 It differs from MAX20052/MAX20053 (2.1MHz high-frequency version) and MAX20050 with internal compensation. MAX20051 runs at fixed 400kHz and adopts external loop compensation, offering full flexibility for EMI optimization and complex multi-LED string matching, ideal for high-current automotive lamp systems facing harsh load-dump voltage surges.
Core Electrical & Functional Features
- Wide Automotive High-Voltage Input Stage
- Operating input voltage: 4.5V ~ 65V, fully tolerates vehicle cold cranking, load dump and transient voltage spikes of 12V/24V automotive battery systems
- Integrated synchronous high/low side power MOSFET (typical Rds(on)=0.14Ω), peak continuous output current up to 2A for series LED strings (1~16 LEDs in series)
- Built-in 5V/10mA auxiliary LDO output to supply MCU, signal detection and peripheral bias circuits on lighting boards
- Flexible Dual Dimming & High-Side Current Regulation
- Two independent dimming modes:
- PWM digital dimming: synchronous with switching clock, supports full 0~100% brightness adjustment
- Analog dimming via REFI pin, linearly tunes LED current down to near zero
- High-side current sensing topology: only single wire connection to LED anode, LED strings can be locally grounded to simplify wiring layout
- Current regulation accuracy: ±2.5% full scale; ±8% at 10% full load across -40°C~+125°C temperature range
- EMI Reduction & Frequency Design
- Fixed 400kHz switching frequency, avoids AM radio band interference
- Built-in spread spectrum modulation (SSM) to suppress peak switching EMI radiation, reduce filter component volume
- External COMP compensation pin for customized loop bandwidth, adapts to different inductance/LED load combinations
- Complete Multi-Layer Fault Protection
- FLT global fault flag pin to notify host ECU of abnormal status
- Integrated protection mechanisms: LED open-circuit detection, output short-circuit lockout, cycle-by-cycle overcurrent limit, thermal shutdown auto-recovery
- Ultra-low shutdown leakage current (5μA typical) to minimize vehicle battery static drain when lamp is off
Package & Automotive Reliability Specs
- Package: 14-pin narrow TSSOP (4.4mm width) with exposed thermal pad for enhanced heat dissipation
- Temperature grade: AEC-Q100 Grade 1, full operating range -40°C ~ +125°C automotive qualification
- MSL 3 moisture sensitivity level, tray bulk packaging; tape-and-reel variant MAX20051AUD/V+T available for mass SMT production
- Fully RoHS, halogen-free and SVHC compliant, meets automotive electronic green standards
Ứng dụng điển hình
Automotive daytime running lights (DRL), position marker lamps
Car fog lights, turn signal indicator lamp drive modules
12V/24V vehicle headlight low/high beam LED constant current circuits
Commercial vehicle, construction machinery exterior warning lighting
Agricultural machinery high-brightness work lamp power drivers
Industrial high-voltage DC 24V~48V high-power LED flood lighting
Bus/truck rear combination tail lamp multi-string LED control boards
Off-road vehicle auxiliary searchlight constant current power modules
LXB Semicon supplies original Analog Devices MAX20051AUD/V+ 400kHz 2A automotive synchronous buck LED driver IC
