With the popularization and promotion of type-c, mobile power supplies on the market are gradually phasing out micro USB interfaces and updating them to type-c interfaces. Micro USB interfaces have been with us for more than ten years since they were launched in 2007. Since the introduction of type-c in 2015, micro USB has gradually faded out of our sight, and mobile phone interfaces have gradually been replaced with type-c interfaces. Accessories on the market have also begun to support type-c interfaces.

Smart devices can be said to have brought tremendous changes to our lives. While entertainment devices are abundant, people also experience charging anxiety. They always worry about running out of battery when going out, so mobile power has effectively filled this gap. When traveling and traveling, it has greatly increased their battery life.

The old mobile power supply usually has two interfaces, one micro USB as input and one USB-A motherboard as output. Now, type-c has been introduced, which can fully use one type-c interface as input and output, saving space and supporting fast charging. In addition, it also includes magnetic wireless charging, which is small and has comprehensive functions.

The market for power banks has always been in a good trend, as intelligent devices emerge endlessly and have basically unified type-c interfaces. A single PD power bank can provide power to most devices. Next, let's take a look at how a single type-c interface can achieve charging and discharging? In the PD protocol, devices can be identified through CC communication. When a mobile phone is connected and CC recognizes it as sink insertion, it is discharged to charge the phone; When an adapter is connected and CC recognizes it as a source insertion, it receives power from the adapter.

We have learned that a PD protocol chip named LDR6035 is designed specifically for single type-c interface charging and discharging. As a DRP chip, it automatically switches between DFP and UFP in different usage scenarios by identifying the inserted devices through CC communication. This saves the cost of multiple interfaces for mobile power supplies and simplifies product design.

A USB-C DRP interface USB PD communication chip developed for Bridge devices in the USB type-c standard. Data Role switching function can be realized and provided to intelligent devices (computers, tablets, mobile phones) for PDO and REQUEST negotiation and automatic DR_ SWAP switches to UFP mode.

LDR6035 features:

SSOP-16 packaging, peripheral simplification

Supports USB PD 2.0 and is compatible with USB PD 3.0

Provided to equipment for negotiation with 5V PDO and REQUEST

Automatic DR_ SWAP to UFP mode

Main application scenarios:

1. USB type-c mobile power supply

2. USB type-C smart device

The schematic diagram of the reference scheme is as follows:

　　Reviewed and edited by: Tang Zihong