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MEZS7-1S-4SPDCharger Reference Design

REFERENCE DESIGN


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Description

The MEZS7-1S-4SPDCharger is a solution module for PD applications with the MP2760 and CCG3PA, supporting PD3.0 and BC1.2 protocols. The MP2760 is a buck-boost charger designed for battery packs with 1 cell to 4 cells in series. The device supplies a wide 3V to 21V voltage range at the IN pin in source mode. This is compliant to the USB PD specifications. The CCG3PA is a Cypress PD controller that handles the PD protocol.

The board contains a DRP Type-C port. When an adapter is inserted, the port acts as a UFP to charge the battery with a maximum 5A charge current. When a load is inserted, the port acts as a DFP to power the USB from the battery.

The board supports narrow-voltage DC (NVDC) power path management, which makes this board well-suited for different portable applications, such as tablets, MIDs, and smartphones. Its low-impedance power path optimizes efficiency, reduces battery charging time, and extends battery life.

Performance Summary (1)

Specifications are at TA = 25°C, unless otherwise noted.

Parameter Conditions Value
Input voltage (VIN) range 4V to 22V
Battery charge regulation voltage (VBATT_REG) 8.4V (I2C-configurable)
Fast charge current VIN = 9V to 20V 5A (I2C-configurable)
Output voltage in source mode (VIN_SRC) 3V to 21V
Charge typical efficiency VIN = 20V, VBATT = 8V, ICC = 5A 93.49%
Charge peak efficiency VIN = 12V, VBATT = 8V, ICC = 3A 96%
Source mode typical efficiency VBATT = 7.4V, VIN_SRC = 20V, IIN_SRC = 1.5A 93.5%
Source mode peak efficiency VBATT = 8.4V, VIN_SRC = 12V, IIN_SRC = 1.5A 96.37%
Switching frequency (fSW) 600kHz (I2C-configurable)

1) Refer to the MP2760 datasheet for more details.


Evaluation Board

LxWxH (8.9cmx8.9cmx0.16cm)

Board Number MPS IC Number
MEZS7-1S-4SPDCharger MP2760GVT

Quick Start Guide

The MEZS7-1S-4SPDCharger is a reference design using the M2760 for PD applications, and includes a DRP Type-C port. Its layout accommodates most commonly used capacitors. The charge current is preset to 5A, and the charge-full voltage is preset to 8.4V for a Li-ion battery with 2 cells in series. In USB On-The-Go (OTG) mode, the output is preset to 5V/3A. All of the charging/discharging parameters are set by the CCG3PA. The user can download their own codes to the CCG3PA through the board’s configuration header.

  1. Connect the load to:
    1. Positive (+): VSYS
    2. Negative (-): GND
  2. Connect the battery terminal to:
    1. Positive (+): VBATT
    2. Negative (-): GND
  3. If using a battery simulator, preset the battery voltage between 0V and 8.4V, then turn it off. Connect the battery simulator’s ports to:
    1. Positive (+): VBATT
    2. Negative (-): GND
  4. Ensure that the battery voltage is present (if using a battery simulator, keep the simulator on).
  5. For charge mode testing, connect the Type-C port to an adapter with a USB Type-C to Type-C or Type-A to Type-C cable. Charge mode should start automatically.
  6. For source mode testing, connect the device to a Type-C port with a USB Type-C to Type-C, Type-C to Micro-B, or Type-C to lighting cable. Source mode should start automatically.

Figure 1 shows the measurement equipment set-up.

Figure 1: Measurement Equipment Set-Up


Evaluation Board Schematic

Figure 2: Evaluation Board Schematic


Solution Module Test Results

Performance curves and waveforms are tested on the evaluation board. CIN = 5 x 10µF + 1 x 1µF, CSYS = 5 x 22µF + 1 x 1µF, CBATT = 2 x 22µF, L = 1.5µH (10mΩ), TA = 25°C, unless otherwise noted.