Microchip Technology MCP1631RD-MCC2 Data Sheet
MCP1631/HV/MCP1631V/VHV
DS22063B-page 16
© 2008 Microchip Technology Inc.
3.7
Analog Ground (A
GND
)
Quiet or analog ground, connect to analog ground
plane to minimize noise on sensitive MCP1631
circuitry.
plane to minimize noise on sensitive MCP1631
circuitry.
3.8
No Connection (NC)
No connection.
3.9
Input Voltage (V
IN
)
High voltage input for MCP1631HV/MCP1631VHV
devices, operates from 3.5V to 16V input supply.
devices, operates from 3.5V to 16V input supply.
3.10
Analog supply Input (A
VDD_IN
)
Analog bias input, minimum 3.0V to 5.5V operation for
MCP1631/MCP1631V devices.
MCP1631/MCP1631V devices.
3.11
Analog Supply Output (A
VDD_OUT
)
Regulated V
DD
output used to power internal
M C P 1 6 3 1 H V / M C P 1 6 3 1 V H V a n d e x t e r n a l
microcontroller, supplies up to 250 ma of bias current at
3.3V or 5.0V regulated low drop out rail.
microcontroller, supplies up to 250 ma of bias current at
3.3V or 5.0V regulated low drop out rail.
3.12
Voltage Sense Input (VS
IN
)
Voltage sense amplifier (A3) input, connect to high
impedance battery voltage resistor divider to sense
battery voltage with minimal loading.
impedance battery voltage resistor divider to sense
battery voltage with minimal loading.
3.13
Current Sense Input (IS
IN
)
Connect to SEPIC secondary side sense resistor to
develop a regulated current source used to charge
multi-chemistry batteries.
develop a regulated current source used to charge
multi-chemistry batteries.
3.14
Voltage Sense Output (VS
OUT
)
Voltage sense amplifier output, connect to
microcontroller analog to digital converter to measure
battery voltage.
microcontroller analog to digital converter to measure
battery voltage.
3.15
Current Sense Output (IS
OUT
)
Current sense amplifier output, connect to error
amplifier (A1) inverting input (FB) to regulate SEPIC
output current.
amplifier (A1) inverting input (FB) to regulate SEPIC
output current.
3.16
Error Amplifier Output (COMP)
Error amplifier (A1) output, connect control loop
compensation from FB input to COMP output pin.
compensation from FB input to COMP output pin.
3.17
Feedback (FB)
Error amplifier input (A1), connect to current sense
output amplifier (A2) to regulate current.
output amplifier (A2) to regulate current.
3.18
Current Sense or Voltage Ramp
(CS/V
(CS/V
RAMP
)
For MCP1631/MCP1631HV applications, connect to
low side current sense of SEPIC switch for current
mode control and peak current limit. For MCP1631/
MCP1631HV application, connect artificial ramp
voltage to V
low side current sense of SEPIC switch for current
mode control and peak current limit. For MCP1631/
MCP1631HV application, connect artificial ramp
voltage to V
RAMP
input for voltage mode PWM control.
3.19
Power VDD (P
VDD
)
Power V
DD
input, V
EXT
gate drive supply input, connect
to +5.0V or +3.3V supply for driving external MOSFET.
3.20
External Driver (V
EXT
)
High current driver output used to drive external
MOSFET at high frequency, capable of 1A peak
currents with +5.0V P
MOSFET at high frequency, capable of 1A peak
currents with +5.0V P
VDD
.
3.21
Exposed PAD 4x4 QFN (EP)
There is an internal electrical connection between the
Exposed Thermal Pad (EP) and the A
Exposed Thermal Pad (EP) and the A
GND
pin; they
must be connected to the same potential on the Printed
Circuit Board (PCB).
Circuit Board (PCB).