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 2022

Microchip Technology Inc. and its subsidiaries

DS90003289B-page 1

TB3289

INTRODUCTION

This document describes a Total System Solution

(TSS) for a single-cell Li-Ion/Li-Polymer battery

charger, consisting of a MCP16311/2 synchronous

buck switching regulator, a MCP73830 1A dedicated

battery charger and an external voltage drop

compensation circuit.

The proposed application circuit offers an effective

solution for the fast charging process of Li-Ion/Li-

Polymer batteries from a wide input voltage range of 5V

to 30V.

LI-ION BATTERIES

When choosing the battery for a specific application,

there are several technical aspects that should be

considered:

• Rechargeable Battery vs. Primary

• Rated Capacity vs. Useful Capacity

• Internal Resistance and Pulse Capability

• Temperature Effects and Storage

• Safety and Transportation

The drawbacks of using a poor solution are:

• Reduced Runtime and Low Efficiency

• Uncertain Reliability and Leakage

Li-Ion batteries have gained popularity and are highly

utilized due to their advantages compared to other

chemistries, as follows:

• High-Energy Density

• Low Self-Discharge Current

• Low Maintenance Required

• High-Power Density

• High-Discharge Current Rate

• High-Charging Current Rate

On the other hand, as previously mentioned, there are

also a few downsides related to:

• Aging

• Need for Protection Circuitry to Maintain Voltage

and Current within Safe Limits

• Manufacturing Costs

• Transportation Conditions

As a general trend, rechargeable batteries are often

used due to their cost effectiveness over their useful life

span. A typical charging profile for Li-Ion batteries is

depicted in Figure 1.

FIGURE 1: Typical Charging Profile

(Li-Ion Battery).

DESIGN CONSIDERATIONS

Input Voltage Range

MCP73830 is a dedicated single cell charger for Li-Ion/

Li-Polymer batteries with a 6V maximum input voltage

range. In order to extend this range up to 30V, the

MCP16311/2 synchronous Buck converter was

connected in series with the battery charger. Figure 2

reveals the block diagram, which also includes the

external compensation block; the proposed application

circuit is detailed in Figure 3.

Charge Qualification for MCP73830

When power is applied, the input supply must rise

150 mV above the battery voltage, before the

MCP73830 device becomes operational. The

automatic power-down circuit sets the device in

Shutdown mode if the input supply falls within +50 mV

of the battery voltage; the automatic circuit is always

active. Whenever the input supply is within +50 mV of

the voltage at the VBAT pin, the MCP73830 is set into

Shutdown mode. For a charge cycle to begin, the

automatic power-down exit conditions must be met

(VDD ≥3.6V and VDD ≥VBAT + 150 mV) and the

charge enable input signal level must be above the

input high threshold. In addition to this, the battery

voltage should be less than 96.5% of V

REG. VREG is

factory set to a typical value of 4.2V.

Author: Andreea Macalau

Microchip Technology Inc.

MCP16311/2 and MCP73830 Single-Cell Battery Charger

Produktspecifikationer

Varumärke:	Microchip
Kategori:	Inte kategoriserad
Modell:	MCP73830
Vikt:	8200 g
Ljudtrycksnivå:	96.4 dB
Ljudnivåosäkerhet:	3 dB
Vibrationsnivåosäkerhet (mejsling):	1.5 m/s²
Geluidsvermogensniveau:	107.4 dB