MAX16977

Part: MAX16977RATE+ — Maxim Integrated

Type: Step-Down (Buck) Converter with Integrated High-Side Switch

Description: 3.5–36 V input, 2 A current-mode buck converter with integrated 70 mΩ (typ) high-side switch, 30 μA standby supply current, and 1–2.2 MHz adjustable switching frequency.

Operating Conditions:

• Supply voltage (SUP, SUPSW): 3.5–36 V (42 V load-dump, t < 1 s)
• Operating temperature: -40 to +125 °C
• Switching frequency: 1–2.2 MHz (resistor-adjustable, synchronizable to external clock)
• Output voltage: 5 V fixed or 1–10 V adjustable

Absolute Maximum Ratings:

• SUP, SUPSW, LX, EN to GND: -0.3 to +42 V
• BST to GND: -0.3 to +47 V
• OUT to GND: -0.3 to +12 V
• LX continuous RMS current: 3 A
• Junction temperature: +150 °C
• Storage temperature: -65 to +150 °C

Key Specs:

• Output voltage (FB = BIAS): 4.925 / 5 / 5.075 V (min/typ/max)
• FB regulation voltage: 1.0 V typ (0.985–1.015 V over -40 to +125 °C)
• Standby supply current (no load, VOUT = 5 V): 30 μA typ, 60 μA max
• Shutdown supply current (VEN = 0 V): 5 μA typ, 12 μA max
• High-side switch RON (ILX = 1 A): 70 mΩ typ, 150 mΩ max
• LX current limit: 2.4 / 3 / 4 A (min/typ/max)
• Oscillator frequency (RFOSC = 12 kΩ): 2.05 / 2.20 / 2.35 MHz
• Minimum on-time: 80 ns typ; maximum duty cycle 98% at 2.2 MHz, 99% at 1 MHz
• Soft-start time: 8.5 ms typ
• Thermal shutdown: +175 °C typ, 15 °C hysteresis

Features:

• Integrated 2 A high-side switch, no external FET required
• Current-mode architecture with fast load-transient response
• Pin-selectable 5 V fixed or 1–10 V adjustable output
• High duty cycle operation during undervoltage transients (cold crank)
• Skip mode for light-load efficiency
• FSYNC external clock synchronization input
• Optional spread spectrum (6%)
• Power-good output
• Overcurrent, overvoltage, and thermal shutdown protection with automatic recovery

Applications:

• Automotive
• Industrial
• High-voltage input DC-DC converters
• Point-of-load applications

Package:

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

• 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

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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