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FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The MC34674 is a fully-integrated Li-Ion and Li-Polymer
battery charger optimized for travel charger or cradle charger
applications. It offers 28 V input-voltage rating for protection
against failed AC/DC converters, 0.2% output voltage
accuracy at room temperature, and the ability to operate with
a current-limited AC/DC output for minimum heat generation.
The MC34674 follows the standard charging profile with
external NTC interface to prevent charging when the ambient
temperature is out of a set window, an internal timer for
safety, and smart battery connection verification.
Two indication outputs make it easy to report the input
power status and the charge status to users via LEDs.
trickle, constant-current (CC) and constant-voltage (CV)
charge modes, as shown in Figure 17 . The trickle-mode
current I TRKL is pre-set to 10% of the CC-mode current I CHG
when the battery voltage is lower than the trickle-mode
4.2V
I CHG
Trickle
CC
CV
Charge
Voltage
threshold V TRKL . In the CC-mode, the output voltage
increases until it reaches 4.2 V. Then the charger enters the
CV-mode with the output voltage regulated at 4.2 V. The end-
Charge
of-charge (EOC) current threshold I EOC , which is utilized to
indicate the termination of a charge cycle, is preset to 10% of
the CC-mode current.
Other features include automatic recharging, internal
thermal regulation to prevent overheating the device, an
V TRKL
I TRKL
Current
I EOC
Figure 17. Charge Profile
FUNCTIONAL PIN DESCRIPTION
INPUT SUPPLY VOLTAGE (VIN)
The supply input. This pin should be bypassed to ground
GROUND (GND)
Ground.
with a 1.0 μ F capacitor.
NTC INTERFACE INPUT (TEMP)
GREEN INDICATOR (GRN)
Open-drain logic output to indicate the charging status.
This pin drives the green-color LED in a dual-color LED pack
with an internal 6.0 mA current source.
RED INDICATOR (RED)
Open-drain logic output to indicate the charging status.
This pin drives the red-color LED in a dual-color LED pack
with an internal 6.0 mA current source.
ENABLE (EN)
Active-low enable logic input. This pin is internally pulled to
ground by a weak current source. When the pin is left floating,
the charger is enabled. Pulling this pin to high voltage
externally disables the charger.
Negative temperature coefficient (NTC) thermistor
interface pin. This pin is connected to an NTC thermistor in
the battery pack to monitor the battery temperature. A pull-up
resistor is required between the TEMP pin and VREF pin.
NTC INTERFACE BIAS VOLTAGE (VREF)
To supply bias voltage for the NTC interface circuit.
CHARGER OUTPUT (BAT)
Charger output pin. Connect this pin to the battery. This
pin should be bypassed to ground with a 1.0 μ F or higher
capacitor.
EXPOSED PAD (EPAD)
Exposed pad. The pad must be soldered on the large
ground plane on the PCB to enhance the thermal
conductivity. The pad must be connected to GND electrically.
34674
Analog Integrated Circuit Device Data
12
Freescale Semiconductor
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