Spezifikationen
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
Typische Anwendungen
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
