MAX20050ATC

Part: MAX20050ATCV (MAX20050–MAX20053 family) — Maxim Integrated

Type: Automotive High-Brightness LED Driver (Synchronous Step-Down Converter)

Description: 4.5–65 V input, up to 2 A synchronous step-down HB LED driver with integrated 0.14 Ω (typ) MOSFETs, 400 kHz or 2.1 MHz switching options, and ±2.5% full-scale current accuracy.

Operating Conditions:

• Supply voltage: 4.5–65 V
• Operating temperature: -40 to +125 °C
• Switching frequency: 400 kHz (MAX20050/51) or 2.1 MHz (MAX20052/53)
• REFI analog dimming range: 0.2–1.2 V; PWM dimming frequency: 100–2000 Hz

Absolute Maximum Ratings:

• Max supply voltage: IN to AGND -0.3 V to +70 V
• Max continuous current: 2.1 A on LX; 1.6 A on IN (TDFN); 2.1 A on IN (TSSOP)
• Max junction temperature: +150 °C
• Storage temperature: -65 to +150 °C

Key Specs:

• Input supply current in shutdown (PWM = 0): 5 μA typ, 8 μA max at VIN = 12 V
• Switching supply current (PWM = 100%, VIN = 12 V): 5 mA typ, 10 mA max (MAX20050/51); 20 mA typ (MAX20052/53)
• VCC LDO output: 5 V (4.875–5.125 V) at 1 mA, 5.5 V < VIN < 65 V; 10 mA capable (6 V < VIN < 25 V)
• Regulation voltage accuracy: 200 mV typ (196–204 mV) at REFI = 1.2 V, 3 V < CSCM < 60 V
• Current-sense gain: 5 V/V typ (4.95–5.05)
• High-side / low-side RDS(on): 170 mΩ typ (340 mΩ max) / 140 mΩ typ (300 mΩ max)
• Switching frequency: 400 kHz typ (360–440 kHz) or 2.1 MHz typ (1890–2310 kHz)
• Cycle-by-cycle current limit: 300 mV typ (285–315 mV) when VCS- > 1.5 V
• Minimum on-time / off-time: 80 ns typ each
• Thermal shutdown: 165 °C typ, 10 °C hysteresis

Features:

• Fully synchronous 2 A step-down converter with integrated MOSFETs
• Internal loop compensation (MAX20050/52) or external compensation (MAX20051/53)
• Switching frequency synchronized to PWM dimming signal
• Spread-spectrum mode (±3%) for EMI reduction
• High-side current regulation requires only a single connection to the LED string
• PWM and analog (REFI) dimming; REFI adjusts LED current down to zero
• Open-drain active-low fault (FLT) indicator
• 5 V, 10 mA LDO output for biasing other circuits
• Output overload, short-circuit, and overtemperature protection

Applications:

• Daytime Running Lamps (DRLs)
• Fog Lamps
• Clearance Lamps
• Corner Lamps
• Rear Lamps
• Head Lamps
• Commercial, industrial, and architectural lighting

Package:

• 12-pin TDFN, 3 mm x 3 mm, exposed pad
• 14-pin TSSOP, 5 mm x 4.4 mm, exposed pad

• Fully Synchronous 2A Step-Down Converter with Integrated 0.14Ω (typ) MOSFETs
• Wide 4.5V to 65V Input Supply Range
• Two Switching Frequency Options: 400kHz and 2.1MHz
• Internal Loop Compensation (MAX20050/MAX20052) and External Loop Compensation (MAX20051/MAX20053) Options
• Switching Frequency Synchronized to PWM Dimming Signal
• Active-Low Fault (FLT) Indicator
• Output Short-Circuit Protection
• High-Side Current Regulation Eliminates One Connection to LED String
• Spread-Spectrum Mode Alleviates EMI Problems
• Low 200mV Full-Scale High-Side Current-Sense Voltage
• REFI Pin Adjusts LED Current Down to Zero
• PWM Dimming Disconnects Both High- and LowSide MOSFET Drivers
• 5V, 10mA LDO Output Provides Bias to Other Circuits
• Ultra-Low Shutdown Current (5μA typ)
• Output Overload, Short-Circuit, and Overtemperature Protections
• 12-Pin (3mm x 3mm) TDFN and 14-Pin (5mm x 4.4mm) TSSOP Package Options

Ordering Information appears at end of data sheet.

• Daytime Running Lamps (DRLs)
• Fog Lamps
• Clearance Lamps (CLLs)
• Corner Lamps (CLs)
• Rear Lamps
• Head Lamps
• Commercial, Industrial, and Architectural Lighting

(V IN = 12V, V REFI = 1.2V, V PWM = V CC , T A = T J = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)

│

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial .

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . Note that a '+', '#', or '-' in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.