DESCRIPTION
The MPQ4253A integrates a monolithic, stepdown, switch-mode converter with two USB current-limit switches and charging port identification circuitry for each port. The MPQ4253A achieves 6A of output current, with excellent load and line regulation over a wide input supply range.
The USB outputs are fixed as one Type-A port and one Type-C port. Each USB switch is current-limited. The USB1 port supports USB Type-C 5V @ 3A DFP mode. The USB2 port supports DCP schemes for battery charging specification (BC1.2), Apple divider 3 mode, and 1.2V/1.2V mode, eliminating the need for outside user interaction.
The MPQ4253A buck and USB2 output is always on if EN is high. The USB1 port capability automatically changes to 1.5A when USB2 detects a device is plugged in.
The step-down converter uses peak current mode control to regulate the output voltage. Under light-load conditions, it enters PFM mode to get high light-load efficiency.
Full protection features include hiccup current limiting, output over-voltage protection (OVP), and thermal shutdown. The device supports load-shedding mode for the USB1 port. When entering load-shedding, the Type-C advertised current capability changes to 1.5A.
The MPQ4253A requires a minimal number of readily available, standard external components, and is available in a QFN-26 (5mmx5mm) package.

FEATURES
 All-In-One Type-C + Type-A Solution
 Type-C Auto-Enters 1.5A Load Capability when the Type-A Port Detects a Device Is Plugged In
 Default Frequency Spread Spectrum Based on 480kHz (FREQ = Float)
 Auto-PFM/PWM Operation
 Wide 6V to 36V Operating VIN Range
 Selectable Output Voltage: 5.1V, 5.17V, or 5.3V
 90mV Line Drop Compensation
 Accurate USB1/USB2 Output Current Limit
 18mΩ/15mΩ Low Internal RDS(ON) Buck Power MOSFETs
 18mΩ/18mΩ Low Internal RDS(ON) USB1/USB2 Power MOSFETs
 250kHz to 1MHz Adjustable Frequency
 Hiccup Current Limit for Both Buck and USB
 Supports DCP Schemes for BC1.2, Apple Divider 3 Mode, and 1.2V/1.2V Mode
 Supports USB Type-C 5V @ 3A DFP Mode
 Available in a QFN-26 (5mmx5mm) Package
 Available in AEC-Q100 Grade 1

APPLICATIONS
 USB Dedicated Charging Ports (DCPs)
 USB Type-C + Type-A Hybrid Charging Ports