MC34675AEPR2 Freescale Semiconductor, MC34675AEPR2 Datasheet - Page 13

• 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

INTEGRATED SUPPLY
Internal Supply and Reference
voltage which powers all the internal blocks. In addition, this
block generates the reference voltage for the charge-control
block.
SENSING & CONTROL
VIN (Input Voltage) Monitor
for two thresholds, power-on-reset (POR) and over-voltage
protection (OVP). If the input is lower than the POR or higher
than the OVP threshold, this block outputs a logic signal to
disable the charger and the linear regulator.
Current Setting & Monitor
mode, and monitors the actual charge current during the
whole charge cycle.
Analog Integrated Circuit Device Data
Freescale Semiconductor
This block steps down the high input voltage to a lower
The input voltage monitor block monitors the input voltage
This block sets the charge current in the constant-current
MC34675 - Functional Block Diagram
Integrated Supply
Current Monitor
Current Setting
V
IN
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Monitor
Sensing & Control
Die Temperature Feedback
Figure 26. 34675 Functional Internal Block Diagram
Integrated Supply
Status Indication
Logic Control
Logic
VIN - BAT Comparator
Sensing & Control
Charge Control
End of Charge
Charge Control
The charge control block controls the gate voltage of the
power MOSFET to regulate the charge current, the battery
voltage, or the die temperature. It can also completely turn off
the power MOSFET, to stop the current flow between the
input and the battery. Additionally, monitoring of the charge
current and the charger output voltage determines the trickle-
charge mode and the recharge cycle.
EOC (End of Charge)
battery voltage for the EOC conditions. Once the EOC
conditions are reached, this block outputs a logic signal to
indicate the end of the charge.
VIN-BAT Comparator
between the input voltage and the battery voltage. The input
voltage has to be higher than the battery voltage for the
charger to be enabled. If the input voltage falls below the
battery voltage, this block outputs a signal to disable the
charger to prevent the leakage current from the battery to the
input.
The EOC block monitors the charge current and the
The VIN-BAT comparator monitors the voltage difference
Logic
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Power MOSFET
Linear Regulator
Outputs
Outputs
FUNCTIONAL DESCRIPTION
34675
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