MC34675AEPR2 Freescale Semiconductor, MC34675AEPR2 Datasheet - Page 12

• 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

battery charger, with a 4.85V/10mA linear regulator in a tiny
package. It uses current, voltage, and temperature control
loops to regulate the charge current. It has up to a 28V input
voltage rating, which makes the handheld device safe even
when connected to a wrong AC adapter. In addition, it
provides a 4.85V/10mA linear regulator.
resistor to build a fully functional charger for space-limited
applications such as cell phones, Bluetooth accessories and
MP3 players. Its ultra high accuracy voltage (±0.7%) and
temperature limited charging current, offer additional battery
safety during charging.
resistor (R
INPUT SUPPLY (VIN)
with a 1.0μF capacitor.
POWER PRESENT INDICATOR (PPR)
supply input voltage. The PPR pin output is singularly
determined by the input voltage.The output is pulled
low if VIN is higher than VPOR. This pin is capable of
sinking at least 9.0mA of current to drive an LED
indicator.
CHARGE INDICATOR (CHG)
output is low when the 34675 is charging, until the EOC
conditions are reached. This pin is capable of sinking at least
9.0mA of current to drive a LED indicator.
ENABLE (EN)
ground by a weak current source. When left floating, the
charger is enabled. Pulling this pin to a high voltage
externally disables the charger.
GROUND (GND)
12
34675
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 34675 is a fully-integrated Li-Ion and Li-Polymer
The 34675 requires only two external capacitors and one
The CC current can be programmed with an external
The supply input. This pin should be bypassed to ground
Open-drain logic output to indicate the status of the
Open-drain logic output to indicate the charge status. The
Active low enable logic Input. This pin is internally pulled to
Ground.
ISET
). The voltage across this resistor is
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
INTRODUCTION
proportional to the charge current, so the system can monitor
the charge current during the whole charge cycle. The EOC
threshold is preset to 10% of the CC mode current. For a
deeply discharged battery with a voltage lower than 2.7V, the
34675 charges the battery with a trickle-mode current, which
is 20% of the CC mode current.
The output is turned on when the input voltage is above the
POR threshold, but lower than the OVP threshold. The Linear
regulator is independent. It is not related to any signals of the
charger, including the enable input pin.
power status and the charge status to MCUs, or users via
LEDs.
LINEAR REGULATOR OUTPUT (DET)
4.85V. The output current capability is 10mA. Bypass this pin
to ground with a ceramic capacitor between 0.1μF and 1.0μF.
CC MODE CURRENT SETTING AND CHARGE
CURRENT MONITOR (ISET)
a resistor, R
charging in the CC mode, the voltage at this pin is 1.0V. The
voltage reduces proportionally as the charge current reduces
in the CV mode. During the whole charge cycle, the voltage
at this pin can be used to monitor the charge current, using
the following equation:
where I
programmed CC mode current, and V
ISET pin during the whole charge cycle.
CHARGER OUTPUT (BAT)
charged. Bypass to ground with a 2.2μF or higher capacitor.
EXPOSED PAD (EPAD)
plane on the PCB to enhance the thermal conductivity. The
pad must be connected to GND electrically.
The linear regulator provides 4.85V with 10mA capability.
Two indication outputs make it easy to report the input
The linear regulator output. The output voltage is typically
The CC mode current, I
Charger output pin. Connect this pin to the battery being
Exposed pad. This must be soldered to the large ground
I
BAT
BAT
=
is the actual charge current, I
ISET
V
-------------- I
1.0V
ISET
, between this pin and ground. When
⋅
Analog Integrated Circuit Device Data
CHG
CHG
, is programmed by connecting
Freescale Semiconductor
ISET
CHG
is the voltage of the
is the