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Application Diagram
(PPR, CHG, and FAST) can be simply interfaced to the system or LEDs to report the charge
status. Its internal thermal foldback control reduces the charge current automatically, whenever
the die temperature reaches the thermal limit threshold of 110°C to keep the charger safe. When
there is no input power, or when the MC34673 is disabled, the charger draws less than a 1.0 μ A
leakage current from the battery.
3
3.1
Application Diagram
Standalone Charger
The MC34673 can be used as a standalone Li-Ion charger. Figure 1 is the typical application
circuit. Two LEDs indicate the charge status.
DC
Input
C IN
VIN
BAT
C OUT
RED GREEN
470
470
GND
MC34673
ISET
R ISET
Li+
PPR
CHG
FAST
EN
Figure 1. The Standalone Li-Ion Charger
3.2
Embedded Charger
When the MC34673 is embedded in the system, the system MCU can control the charger
through the EN pin and get the charge status through PPR, CHG, and FAST pins. Figure 2 is the
typical application circuit.
DC
Input
C IN
VIN
BAT
C OUT
Li+
V IO
GND
ISET
MC34673
100Kx3
R ISET
CH G
PPR
FAST
EN
OFF
MCU
ON
Figure 2. The Li-Ion Charger Embedded in the Hand Held System
Using the High Input Voltage Charger for Single Cell Li-Ion Batteries , Rev. 1.0
2
Freescale Semiconductor
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