LX7180A Series

4A Step-Down Regulator

Catalog

4A Step-Down Regulator

Part	Current - Output	Function	Voltage - Output (Min/Fixed)	Package / Case	Voltage - Input (Max) [Max]	Output Type	Mounting Type	Number of Outputs	Voltage - Output (Max) [Max]	Output Configuration	Frequency - Switching	Topology	Supplier Device Package	Operating Temperature [Max]	Voltage - Input (Min) [Min]
Microchip Technology LX7180A-01CLQ-TR	4 A	Step-Down	0.6 V	12-PowerVFQFN	5.5 V	Programmable	Surface Mount	1	5.5 V	Positive	1.65 MHz	Buck	12-QFN (2x2)	85 C	3 V
Microchip Technology LX7180A-11CLQ-TR	4 A	Step-Down	0.6 V	12-PowerVFQFN	5.5 V	Programmable	Surface Mount	1	5.5 V	Positive	1.65 MHz	Buck	12-QFN (2x2)	85 C	3 V
Microchip Technology LX7180A-31CLQ-TR	4 A	Step-Down	0.6 V	12-PowerVFQFN	5.5 V	Programmable	Surface Mount	1	5.5 V	Positive	1.65 MHz	Buck	12-QFN (2x2)	85 C	3 V
Microchip Technology LX7180A-21CLQ-TR	4 A	Step-Down	0.6 V	12-PowerVFQFN	5.5 V	Programmable	Surface Mount	1	5.5 V	Positive	1.65 MHz	Buck	12-QFN (2x2)	85 C	3 V

Catalog

4A Step-Down Regulator

Key Features

• * 0-4 A Step-down Regulator

• * Operational Input Supply Voltage Range: 3.0 V - 5.5 V (short durations to 6.5 V)

• * Hysteretic Control Offers Best Transient Response

• * PWM Switching at a Constant 1.65 MHz

• * Power Save Mode (PSM) can be Selected to Improve Light Load Efficiency

• * 100% Duty Ratio Operation

• * Input Under Voltage and Over Voltage Protection

• * Enable and Power Good Function

• * I2C Serial Interface at 3.4 Mbps

• * Internal Soft-start

• * Cycle-by-Cycle Over Current Protection

• * Hiccup Mode Protects Against Short Circuit Faults

• * Seven Bit Adjustable Reference Voltage via I2C Bus

• * RoHS Compliant

Description

The LX7180A is a 4A step-down regulator with integrated MOSFETs packaged in a space saving QFN12 2 mm x 2 mm 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 LX7180A reference voltage is programmable from 0.6 V to 1.195 V through a high speed (up to 3.4 MHz), bi-directional I2C bus. The LX7180 operates from 3 V to 5.5 V rails and outputs 0.6 V 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 LX7180A automatically restarts when all fault conditions are cleared.