MC34675AEPR2 Freescale Semiconductor, MC34675AEPR2 Datasheet - Page 18

• Manufacturer Part Number: MC34675AEPR2
• Description: IC BATTERY CHARGER 28V 8-UDFN
• Manufacturer: Freescale Semiconductor

Specifications of MC34675AEPR2

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 2.6 V ~ 6.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-UDFN
• Product: Charge Management
• Output Voltage: 4.2 V
• Output Current: 1000 mA
• Operating Supply Voltage: 2.6 V to 6.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

INPUT CAPACITOR
transient, which may cause instability when the input voltage
is near V
capacitor is recommended for most applications.
OUTPUT CAPACITOR
minimum 2.2μF nominal value is recommended at the
charger output. Depending on the load transient current, a
larger capacitance may be required.
capacitor of 0.1μF through 1.0μF. An X5R ceramic capacitor
of 0.22μF is recommended for the application.
CC MODE CURRENT SETTING
resistor, R
guarantee 6% current accuracy.
DROPOUT VOLTAGE
programmed charge current due to the voltage dropout over
CHARGER IN THE HANDHELD SYSTEM
control, the 34675 uses PPR to report the DC input status to
the MCU. After the MCU pulls the EN pin to a low logic level
to start charging, the 34675 reports the charge status through
18
34675
TYPICAL APPLICATIONS
APPLICATION INFORMATION
The input capacitor is used to reduce the input voltage
For stable operation, an X5R ceramic capacitor with a
The linear regulator is designed to be stable with a ceramic
The CC mode current can be programmed by the external
If the DC input voltage is too low, it may not maintain the
When the charger is used in handheld systems with MCU
BAT
ISET
+V
. A 1% accuracy resistor is recommended to
OS
Input
. A 1.0μF, X5R, 16V rated ceramic
DC
1.0µF
8.06K
Figure 30. Li+ Battery Charger in Handheld System
VIN
GND
ISET
MC34675
TYPICAL APPLICATIONS
APPLICATION INFORMATION
TYPICAL APPLICATIONS
CHG
PPR
DET
BAT
EN
0.22µF
ON
2.2µF
the power MOSFET. The worst case of the R
475mΩ. The input voltage should be at least higher than
V
mode current.
USE DET AS POWER PRESENCE INTERRUPT
presence indication signal, to turn on an originally-off phone,
when an ac/dc adapter is plugged in. The DET output can be
used for such a purpose, instead of the PPR pin.
THERMAL CONSIDERATIONS
UDFN package. A careful thermal design must be
considered. The exposed pad needs to be well soldered to a
large copper ground plane on the component layer. If the
component layer is space limited and does not allow for a
large copper plane, the thermal pad must be connected to
other ground layers through a via array. This allows the
34675 to charge the battery with the maximum current, while
minimizing the die temperature.
the CHG pin to the MCU. The MCU can also monitor the
charge current by measuring the voltage at the ISET pin. The
linear regulator powers subsystems, such as a USB
transceiver, that require a voltage higher than 4.5V.
Figure 30
OFF
BAT
Some cell phone designs require an active-high power
The 34675 is available in a tiny 2x3 thermally-enhanced
+ I
CHG
is the typical application circuit.
x 475mΩ, to guarantee the programmed CC
Li+
100K
Analog Integrated Circuit Device Data
V
IO
100K
Freescale Semiconductor
MCU
USB
Xcvr
DS(ON)
is