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Microchip MCP1632 | Demoboard MCP1632-BAE/MS

MCP1632 SINGLE-CELL LI-ION BATTERY CHARGER DEMO BOARD USER’S GUIDE

Overview

TopologySEPIC Buck-Boost Topology
Input voltage4.5-12 V
Output 14.2 V / 1 A
IC revisionA

Description

switch-mode power converter. When combined with an external microcontroller, theMCP1632 can be used to implement different intelligent converters like thosenecessary for battery chargers.The power train of this application uses the Single-Ended Primary Inductor Converter(SEPIC) topology. This topology offers buck-boost functionality and also hasnon-pulsating input current.The converter provides constant voltage with limited current at the output, necessaryfor certain battery charging applications (ex. Li-Ion-based batteries).The output voltage is measured with a voltage divider resistor pair (R1, R5). Thisvoltage must be precisely 4.2V, required by the battery chemistry.The average current in the L1B inductor, which is also the output current of theconverter, is sensed using a 0.1Ω shunt resistor (RS). As the voltage across the shuntresistor is negative, a -10x amplifier (U3) is used for battery charging current sensing.The conversion gain of this circuit is 1V/A.The PWM output available from the PIC12F1822 microcontroller is used to control thereference voltage of the MCP1632 using the circuit created with D2 and R3 components.Maximum output current is set by the PIC12F1822 microcontroller.

Features

Input voltage: +4.5V to +12V

  • Load disconnect protection software configurable
  • Typical output current: 1000 mA
  • Maximum output current: 1500 mA (with firmware adjustments)
  • Typical output power: 4.2W (maximum 7W at +25°C degree ambient temperature)
  • Fully protected against Short-Circuit and No Load condition
  • Figure 1-1 shows a simplified block diagram of the application

Products

Order Code Data­sheet Downloads Product seriesL1
(µH)
L2
(µH)
IR 1
(A)
IR 2
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC2 typ
(Ω)
RDC1 max
(Ω)
RDC2 max
(Ω)
fres 1
(MHz)
Type Samples
744878004
STE ALT EAG CAD LTS PSP IGS CADWE-DD SMT Shielded Coupled Inductor 4.7 4.7 1.3 1.3 3 0.065 0.065 0.075 0.075 46 Straight
Order Code Data­sheet
744878004
Samples
Order Code Data­sheet Downloads Product seriesL1
(µH)
L2
(µH)
IR 1
(A)
IR 2
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC2 typ
(Ω)
RDC1 max
(Ω)
RDC2 max
(Ω)
fres 1
(MHz)
Type Samples