LX7176A Series

4A Step-Down-Regulator

Catalog

4A Step-Down-Regulator

Part	Package / Case	Frequency - Switching	Voltage - Output (Min/Fixed)	Voltage - Input (Max) [Max]	Function	Output Type	Voltage - Output (Max) [Max]	Output Configuration	Number of Outputs	Voltage - Input (Min) [Min]	Current - Output	Mounting Type	Supplier Device Package	Topology	Operating Temperature [Min]	Operating Temperature [Max]	Synchronous Rectifier
Microchip Technology LX7176ACLQ-TR	12-PowerVFQFN	1.65 MHz	0.6 V	5.5 V	Step-Down	Adjustable	5.5 V	Positive	1	3 V	4 A	Surface Mount	12-QFN (2x2)	Buck	0 °C	85 C
Microchip Technology LX7176CLQ-13162-TR	12-PowerVFQFN	1.65 MHz	0.6 V	5.5 V	Step-Down	Adjustable	5.5 V	Positive	1	3 V	3 A	Surface Mount	12-QFN (2x2)	Buck	0 °C	85 C

Catalog

4A Step-Down-Regulator

Key Features

• * 0-4A Step-down Regulator

• * Operational Input Supply Voltage Range: 3V-5.5V (short durations to 6.5V.)

• * Hysteretic control offers best transient response

• * CCM switching at a constant 1.65MHz

• * Automatically switches to DCM switching under light loads to improve efficiency

• * 100% Duty Ratio Operation

• * Input under voltage and over voltage protection

• * Enable and Power Good Function

• * Internal soft-start

• * Cycle-by-Cycle Over Current Protection

• * Hiccup Mode protects against short circuit faults

• * RoHS Compliant

Description

The LX7176A is a 4A step-down regulator with integrated MOSFETs packaged in a space saving QFN12 2mm x 2mm for today’s mobile devices. It uses an ultra fast, constant frequency hysteretic control method to minimize external filter components while maintaining excellent regulation. The LX7176A reference voltage is 0.6V. The LX7176A operates from 3V to 5.5V rails and outputs 0.6V to 100% of the input voltage. Cycle-by-cycle current limiting protects against overcurrent conditions. Hiccup mode provides protection for heavy over-load or short-circuit faults. Thermal protection shuts down the regulator under overtemperature conditions. Over voltage conditions will immediately shut off the output to protect against permanent damage. The LX7176A automatically restarts when all fault conditions are cleared. Internal soft start circuitry limits start up inrush currents.