MAX16977RATE+

Part: MAX16977 — Maxim Integrated

Type: Current-Mode Step-Down Converter

Description: The MAX16977 is a 2A, current-mode, step-down converter with an integrated high-side switch, designed for 3.5V to 36V input operation with 30 μA quiescent current and adjustable switching frequency from 1MHz to 2.2MHz.

Operating Conditions:

• Supply voltage: 3.5V to 36V
• Operating temperature: -40°C to +125°C
• Output voltage: 5V fixed or 1V to 10V adjustable
• Switching frequency: 1MHz to 2.2MHz

Absolute Maximum Ratings:

• Max supply voltage (SUP, SUPSW, LX, EN to GND): +42V
• Max continuous current (LX Continuous RMS Current): 3A
• Max junction temperature: +150°C
• Max storage temperature: -65°C to +150°C

Key Specs:

• Supply Current (Standby mode, no load, V OUT = 5V): 30 μA (typ)
• Shutdown Supply Current (V EN = 0V): 5 μA (typ)
• BIAS Regulator Voltage (V SUP = V SUPSW = 6V to 36V): 4.7V (min), 5V (typ), 5.3V (max)
• Output Voltage (V FB = V BIAS, normal operation): 4.925V (min), 5V (typ), 5.075V (max)
• Adjustable Output Voltage Range: 1V to 10V
• LX Current Limit: 2.4A (min), 3A (typ), 4A (max)
• Power-Switch On-Resistance (R ON measured between SUPSW and LX, I LX = 1A, V BIAS = 5V): 70 mΩ (typ), 150 mΩ (max)
• FB Regulation Voltage (FB connected to an external resistive divider; -40°C < T A < +125°C): 0.985V (min), 1.0V (typ), 1.015V (max)
• Oscillator Frequency (R FOSC = 12kΩ): 2.05MHz (min), 2.20MHz (typ), 2.35MHz (max)
• Soft-Start Time: 8.5 ms (typ)
• Thermal Shutdown Threshold: 175°C (typ)

Features:

• Supports up to 2A loads without external FET
• Integrated 2A internal high-side (70mΩ typ) switch
• Fast load-transient response and current-mode architecture
• Direct car battery to sub-5V rail conversion at beyond 2MHz
• 5V fixed or 1V to 10V adjustable output voltage
• High duty cycle during undervoltage transients
• Robust input voltage up to 36V, 42V input transients tolerance
• Overvoltage, undervoltage, overtemperature, and short-circuit protections
• 30μA standby mode operating current, 5μA typical shutdown current
• Adjustable switching frequency (1MHz to 2.2MHz)
• Frequency-synchronization input
• Spread Spectrum (Optional)
• Power-good monitor

Applications:

• Automotive
• Industrial
• High-Voltage Input DC-DC Converters
• Point-of-Load Applications

Package:

• 16-pin TSSOP
• TQFN (5mm x 5mm) with exposed pads

• Supports Up to 2A Loads without External FET Saves Space and Cost
• Integrated 2A Internal High-Side (70m I typ) Switch
• Fast Load-Transient Response and Current-Mode Architecture
• Direct Car Battery to Sub-5V Rail Conversion at Beyond 2MHz Reduces External Component Count
• 5V Fixed or 1V to 10V Adjustable Output Voltage
• High Duty Cycle During Undervoltage Transients
• Robust Input Voltage Up to 36V Supports Automotive Applications
• Wide 3.5V to 36V Input Voltage Range
• 42V Input Transients Tolerance
• Overvoltage, Undervoltage, Overtemperature, and Short-Circuit Protections
• Meets Tight OEM Power-Consumption Requirements with Low I Q
• 30μA Standby Mode Operating Current
• 5μA Typical Shutdown Current
• Advanced Clock Capabilities Offer Further Reduction in EMI if Necessary to Enable Noise-Free System Design
• Adjustable Switching Frequency (1MHz to 2.2MHz)
• Frequency-Synchronization Input
• Spread Spectrum (Optional)

Ordering Information appears at end of data sheet.

Automotive

Industrial

High-Voltage Input DC-DC Converters

Point-of-Load Applications

(V SUP = V SUPSW = 14V, V EN = 14V, C BIAS = 1 F F, R FOSC = 12k I , T A = T J = -40 N C to +125 N C, unless otherwise noted. Typical values are at T A = +25 N C.)

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TSSOP

Junction-to-Ambient Thermal Resistance ( B JA ) .......38.3 N C/W Junction-to-Case Thermal Resistance ( B JC ) .................3 N C/W

• TSSOP (derate 26.1mW/ o C above +70 o C).......... 2088.8mW*
• TQFN (derate 28.6mW/ o C above +70 o C)............ 2285.7mW*
• Operating Temperature Range........................ -40 N C to +125 N C
• Junction Temperature .....................................................+150 N C
• Storage Temperature Range............................ -65 N C to +150 N C
• Lead Temperature (soldering, 10s) ................................+300 N C
• Soldering Temperature (reflow) ..................................... +260 o C

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.

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