Garmin MC34676B- Manual

Garmin MC34676B

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Table of Contents:

  • Page 2 – Using the Dual 28V Input Voltage Charger with Linear Regulator,; Freescale Semiconductor; Application Diagram; Dual-Input Standalone Charger; The MC34676B can be used as a dual-input standalone Li-Ion charger.; Figure 1; is the typical application circuit. Two; Embedded Charger; Figure 2; is the typical application circuit.; Figure 2. The Li-Ion Charger Embedded in the Hand Held System
  • Page 3 – Evaluation Board Specification; Figure 3; Figure 3. The Schematic Circuit of the Evaluation Board
  • Page 4 – Component Selection; Input capacitors C1 and C3; Table 1; USB CC-mode charge current setting resistors R8 and R9; Table 2; Table 1. The AC CC-mode Charge Current Settings; Table 2. The USB CC-mode Charge Current Settings; Charge Current
  • Page 5 – End-of-charge current setting resistors R10 and R11; Table 3; Table 3. The EOC Current Settings
  • Page 6 – Layout Design; Layout; Figure 4; is an overview of the board, followed by the layout of each layer.; Figure 4. The Overview of the Evaluation Board
  • Page 7 – Figure 6. The Component Side Layer of the Evaluation Board
  • Page 8 – Layout considerations; capacitance between the current setting pin and ground.
  • Page 9 – Evaluation Board Configuration; Pin Headers; The default settings of the evaluation board are shown in; Table 4; , which selects the AC charger of MC34676B.; Table 4. The Default Settings of the Pin Headers; Pin Header Jumpers
  • Page 10 – Connector Pads; Open
  • Page 11 – Test Setup with the Evaluation Board; The test setup is shown in; Figure 8; and; Figure 9; . Connect a DC power source with a larger than 2.0A current limit to; Figure 8. The AC Charger Set Up for the Evaluation Board
  • Page 12 – Bill of Material
  • Page 13 – References; Products; Freescale’s Web Site
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© Freescale Semiconductor, Inc., 2009. All rights reserved.

Freescale Semiconductor

User’s Guide

Document Number: KT34676BUG

Rev. 1.0, 2/2009

1

Purpose

This User Guide helps the Lithium-Ion (Li-Ion) battery
charger designer understand the MC34676B and its
evaluation board. It illustrates the design procedure when
using the MC34676B to design a Li-Ion battery charger, and
the way to get the best performance from the MC34676B.

2

Scope

The 34676 is a dual 28V input voltage and fully-integrated

single cell Li-Ion battery charger, targeting smart handheld

applications. One of the inputs is optimized for charging with

a USB port, and the second is optimized for an AC/DC

adapter power source. The charger has two 28V power

devices, to eliminate the need of any external power source

selection and input over-voltage protection circuitry. Each of

the power devices independently controls the charge

current from the input, and performs as an independent

charger. Only one of the two chargers operate at a time.

The AC charger current and the USB charger current are

programmable, up to 1.2A and 400mA, with an external

resistor respectively. The voltage across the two external

resistors is also used to monitor the actual charge current

through each charger respectively. The EOC current of both

chargers is the same, and programmable by an external

resistor. The 4.85V regulator can be used to power a

sub-system directly.

The 34676 has a 5% constant current accuracy for the AC

Charger over -40 to 85

o

C, and a 1.0% constant voltage

accuracy over -40 to 85

o

C. A charge current thermal

foldback feature, limits the charge current when the IC

internal temperature rises to a preset threshold.

Using the High Input Voltage Charger for
Single Cell Li-Ion Batteries
(KIT34676EPEVBE)

Contents

1 Purpose

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

2 Scope

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

3 Application Diagram

. . . . . . . . . . . . . . . . . . .

2

4 Evaluation Board Specification

. . . . . . . . . .

3

5 Component Selection

. . . . . . . . . . . . . . . . . .

4

6 Layout Design

. . . . . . . . . . . . . . . . . . . . . . . .

6

7 Evaluation Board Configuration

. . . . . . . . . .

9

8 Test Setup with the Evaluation Board

. . . .

11

9 Bill of Material. . . . . . . . . . . . . . . . . . . . . . . . 13

10 References

. . . . . . . . . . . . . . . . . . . . . . . . .

13

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Summary

Page 2 - Using the Dual 28V Input Voltage Charger with Linear Regulator,; Freescale Semiconductor; Application Diagram; Dual-Input Standalone Charger; The MC34676B can be used as a dual-input standalone Li-Ion charger.; Figure 1; is the typical application circuit. Two; Embedded Charger; Figure 2; is the typical application circuit.; Figure 2. The Li-Ion Charger Embedded in the Hand Held System

Using the Dual 28V Input Voltage Charger with Linear Regulator, Rev. 1.0 2 Freescale Semiconductor Application Diagram 3 Application Diagram 3.1 Dual-Input Standalone Charger The MC34676B can be used as a dual-input standalone Li-Ion charger. Figure 1 is the typical application circuit. Two LEDs ind...

Page 3 - Evaluation Board Specification; Figure 3; Figure 3. The Schematic Circuit of the Evaluation Board

Using the Dual 28V Input Voltage Charger with Linear Regulator, Rev. 1.0 Freescale Semiconductor 3 Evaluation Board Specification 4 Evaluation Board Specification The evaluation board is designed to work as a standalone charger, or as an embedded charger in a handheld system. Figure 3 shows its sche...

Page 4 - Component Selection; Input capacitors C1 and C3; Table 1; USB CC-mode charge current setting resistors R8 and R9; Table 2; Table 1. The AC CC-mode Charge Current Settings; Table 2. The USB CC-mode Charge Current Settings; Charge Current

Using the Dual 28V Input Voltage Charger with Linear Regulator, Rev. 1.0 4 Freescale Semiconductor Component Selection 5 Component Selection 5.1 Input capacitors C1 and C3 The input capacitor is used to minimize the input voltage transient that may cause instability. A ceramic capacitor of 1.0 μ F o...

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