LM5642XMTX

LM5642 / LM5642X高电压，双通道同步降压转换器与振荡器同步 LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization

DESCRIPON

The LM5642 series consists of two current mode synchronous buck regulator controllers operating 180° out of phase with each other at a normal switching frequency of 200kHz for the LM5642 and at

375kHz for the LM5642X.

FEATURES

• Two Synchronous Buck Regulators

• 180° Out of Phase Operation

• 200 kHz Fixed Nominal Frequency: LM5642

• 375 kHz Fixed Nominal Frequency: LM5642X

• Synchronizable Switching Frequency from 150 kHz to 250 kHz for the LM5642 and 200 kHz to

500 kHz for the LM5642X

• 4.5V to 36V Input Range

• 50 µA Shutdown Current

• Adjustable Output from 1.3V to 90% of Vin

• 0.04% Typical Line and Load Regulation Accuracy

• Current Mode Control with or without a Sense Resistor

• Independent Enable/Soft-start Pins Allow Simple Sequential Startup Configuration.

• Adjustable Cycle-by-cycle Current Limit

• Input Under-voltage Lockout

• Output Over-voltage Latch Protection

• Output Under-voltage Protection with Delay

• Thermal Shutdown

• Self Discharge of Output Capacitors when the Regulator is OFF

• TSSOP and HTSSOP Exposed PAD Packages