MPQ3445GUE-0000-AEC1-Z Synchronous Boost Controller QFN-21

MPQ3445GUE-0000-AEC1-Z Synchronous Boost Controller QFN-21

The MPQ3445 is a highly efficient, current- mode, synchronous boost controller with a wide input voltage (VIN) range.

Key Specifications

Features

• Designed for Automotive Applications o Supports 2.9V Cold Crank o Supports 42V Load Dump o -40°C to +150°C Operating Junction Temperature (TJ) o Available in AEC-Q100 Grade 1
• Increases Battery Life o 40μA Bypass Mode Quiescent Current (IQ) FEATURES (continued) o Automatic Wake-Up and Bypass Mode Transition o 10V Gate Driving Capability
• Functional Safety System Design Capable o MPSafe™ Compatible – Functional Safety Supporting Document Available

Typical Application Circuit

Applications

• Automotive Start-Stop Systems
• Automotive Emergency Call Systems
• Advanced Driver-Assistance Systems (ADAS)

Design Notes

• Size the inductor for the ripple current at the actual switching frequency, typically 30% of the DC load — not for the DC rating alone.
• The hot loop from input capacitor through the switch to ground sets conducted EMI. Keep that copper area as small as the layout allows.
• Output ripple is set by the capacitor ESR and its DC-bias derating; a 10 µF ceramic often behaves like 4 µF at the rated output voltage.
• Route the feedback divider from the output capacitor terminals, away from the switch node.

Common Questions