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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 indicate the charge status.
Figure 1. The dual-input Li-Ion Charger
3.2 Embedded Charger
When the MC34676B is embedded in the system, the system MCU can control the charger through the USBEN pin and
get the charge status through
PPR and CHG pins. Figure 2 is the typical application circuit.
Figure 2. The Li-Ion Charger Embedded in the Hand Held System
MC34676B
AC
CHG
ISET
PPR
USB
USBOUT
BAT
BATDET
USBEN
GND
IMIN IUSB
OFF
ON
C2
C1
R
IMIN
R
IUSB
R
ISET
C3
C4
AC
USB
GND
IMIN
IUSB ISET
CHG
PPR
USBOUT
BAT
VDDIO
MCU
MC34676B
AC
USB
C1 C2
R
IMIN
R
IUSB
R
ISET
C
3
C
4
USBEN
BATDET