Manual Garmin MC34676B

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  • Garmin MC34676B - page 1

    © Freescale Semiconductor, In c., 2009. All rights reserved. Freescale Semiconductor User’s Guide Document Number: KT34676BUG Rev. 1.0, 2/2009 1P u r p o s e This User Guide helps the Lithium-Ion (Li-Io n) battery charger designer unde rstand the MC34676B an d its evaluation board. It i llustra tes the design procedure when using the MC34676B to ...

  • Garmin MC34676B - page 2

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 2 Freescale Semiconductor Application Di agram 3 Application Diagram 3.1 Dual-Input St andalone Charger The MC34676B can be used as a dual-in put standalone Li-Ion charger . Fi gure 1 is the typical application circuit. T wo LEDs indi cate the charg e status. Figure 1. The ...

  • Garmin MC34676B - page 3

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 Freescale Semiconductor 3 Evaluation Bo ard Specificat ion 4 Evaluation Board S pecification The evaluation board is designed to work as a standalone cha rger , or as an embedded charger in a handheld system. Figure 3 shows its schematic circuit. The normal op eration range ...

  • Garmin MC34676B - page 4

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 4 Freescale Semiconductor Component Sele ction 5 Component Selection 5.1 Input cap acitors 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 or above is required for most applications. ...

  • Garmin MC34676B - page 5

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 Freescale Semiconductor 5 Component Selection 5.5 End-of-charge current set ting resistors R10 and R1 1 The end-of-charge (EOC) current for both t he AC charger and the USB charger can be se t by the resisto rs R10 and R1 1. On the evaluation board, two resisto rs with one ...

  • Garmin MC34676B - page 6

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 6 Freescale Semiconductor Layout Design 6 Layout Design 6.1 Layout The KIT34676EPEVBE PCB board has two copper layers. The component sid e of the KIT34676EPEVBE is provided to locate all components. Figure 4 is an overview of the board, followed by the layout of each layer ...

  • Garmin MC34676B - page 7

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 Freescale Semiconductor 7 Layout Design Figure 6. The Compone nt Side Layer of the Evaluation Board Figure 7. The Solder Side Layer of the Evaluation Boar d ...

  • Garmin MC34676B - page 8

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 8 Freescale Semiconductor Layout Design 6.2 Layout considerations • Place decoupling capacitors C1, C3 and C4 as close as possible to the AC pin, USB pin and BA T pin respective ly . • Place the charge current setting resistor as close as po ssible to the current settin ...

  • Garmin MC34676B - page 9

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 Freescale Semiconductor 9 Evaluation Bo ard Configuration 7 Evaluation Board Configuration 7.1 Pin Headers The J1 and J3 pin headers li nk the external power source to the AC pin or USB pin of the MC34676B respectively . It allows the user to measure the current from the po ...

  • Garmin MC34676B - page 10

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 10 Freescale Semiconductor Evaluation Boar d Configuration 7.2 Connector Pads There are 14 connecting pads (TP1 to TP14 with correspo nding names) on the evaluation b oard to let the user simply connect the board to their system. The GND pads link power ground of the MC3467 ...

  • Garmin MC34676B - page 11

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 Freescale Semiconductor 11 Test Setup with th e Evalua tion Board 8 T est Setup with the Evaluation Board The test setup is shown in Figure 8 and Figure 9 . Con nect a DC power source with a larger than 2.0A current limit to the AC pad or a USB power port to the USB pad on ...

  • Garmin MC34676B - page 12

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 12 Freescale Semiconductor Bill of Material 9 Bill of Material Item Qty Part Reference Va l u e DESCRIPTION Footprint Mfr PN 1 2 C1,C3 1.0UF CAP CER 1.0UF 16V 10% X5R 0603 CC0603 MURA T A TDK GRM188R61C105KA93 C1608X5R1C105K 2 1 C2 NC No Connection CC0603 N/A N/A 3 2 C4,C5 ...

  • Garmin MC34676B - page 13

    Using the Dual 28V Input V oltage Charger with Linear Regulator , Rev . 1.0 Freescale Semiconductor 13 References 10 References Following are URLs where you can ob tain information on other Freescale product s and application solutions: Product s Links Data Sheet MC34676 www .freescale.co m/files/anal og/doc/data_sheet/MC3 4676.pdf Freescale’s W ...

  • Garmin MC34676B - page 14

    How to Reach Us: Home Page: www .freescale.com E-mail: support@freescale.com USA/Europe or Locations No t Listed: Freescale Semiconductor T echnical Information Center , CH370 1300 N. Alma School Road Chandler , Arizona 85224 +1-800-521-6274 or +1-480-768-2130 support@freescale.com Europe, Middle East, and Africa: Freescale Halbleiter Deutschland G ...

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