MCP1632-BAESLASHMS datasheet(19/34 Pages) MICROCHIP

19 / 34 page

A typical charger application for one- or two-cell Li-Ion batteries is presented in

Figure 5-3. The PIC microcontroller handles all the necessary functions of the

charger and the MCP1632 device controls the power train. Using the SEPIC

converter allows developing a universal charger where the input voltage can be

higher or lower than the battery voltage. The microcontroller can control the

reference voltage across certain limits using its internal high-frequency PWM

generator and the external circuit consisting of D2 and R1.

This circuit can be replaced with a digital-to-analog converter (DAC) for a better

range and accuracy of the reference voltage control. The charging current is

monitored using a low-side shunt (RS) and an inverting amplifier. The floating

voltage of the charger is controlled by MCP1632 and can be adjusted by varying

the value of the RVREF resistor or the ratio of the feedback divider (R5, R6).

Additional protection features can be implemented in the microcontroller’s

firmware.

FIGURE 5-3:

Battery Charger Circuit.

MCP1632

RVREF

CSS

VIN

VREF

COMP

VEXT

GND

VIN

LDO

RSENSE

RSLOPE

L1A

CIN

COUT

L1B

Battery

PIC

Micro

VSENSE

CSENSE

VSENSE

Status

AN1

AN2

PWM

I/O

VCC

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