MCP73832T-2ACI/OT Microchip Technology Inc., MCP73832T-2ACI/OT Datasheet - Page 10

• Manufacturer Part Number: MCP73832T-2ACI/OT
• Description: TINY INTEGRATED LI-ION/LI-POLY CHARGE MGNT CONTROLLER, 4.2V VREG
• Manufacturer: Microchip Technology Inc.

Specifications of MCP73832T-2ACI/OT

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

MCP73831/2
4.0
The MCP73831/2 are highly advanced linear charge
management
operational flow algorithm from charge initiation to
completion and automatic recharge.
FIGURE 4-1:
4.1
An internal UVLO circuit monitors the input voltage
and keeps the charger in Shutdown mode until the
input supply rises above the UVLO threshold. The
UVLO circuitry has a built in hysteresis of 100 mV.
In the event a battery is present when the input power
is applied, the input supply must rise 150 mV above
the battery voltage before the MCP73831/2 becomes
operational.
DS21984B-page 10
DEVICE OVERVIEW
Under Voltage Lockout (UVLO)
STAT = HIGH (MCP73831)
STAT = Hi-Z (MCP73832)
CONSTANT VOLTAGE
Charge Current = I
Charge Voltage = V
CHARGE COMPLETE
controllers.
Charge Current = I
PRECONDITIONING
SHUTDOWN MODE
No Charge Current
PROG > 200 k
FAST CHARGE
V
STAT = Hi-Z
STAT = LOW
STAT = LOW
STAT = LOW
V
DD
DD
MODE
MODE
MODE
MODE
Flowchart.
< V
< V
or
UVLO
BAT
V
V
V
I
Figure 4-1
BAT
BAT
BAT
BAT
PREG
REG
< I
REG
< V
> V
= V
TERM
PTH
PTH
REG
V
V
BAT
BAT
depicts the
> V
< V
PTH
RTH
The UVLO circuit places the device in Shutdown mode
if the input supply falls to within +50 mV of the battery
voltage. Again, the input supply must rise to a level
150 mV above the battery voltage before the
MCP73831/2 become operational.
The UVLO circuit is always active. At any time the
input supply is below the UVLO threshold or within
+50 mV of the voltage at the V
MCP73831/2 are placed in a Shutdown mode.
During any UVLO condition, the battery reverse
discharge current shall be less than 2 A.
4.2
For a charge cycle to begin, all UVLO conditions must
be met and a battery or output load must be present. A
charge
connected from PROG to V
open or floating, the MCP73831/2 are disabled and
the battery reverse discharge current is less than 2 A.
In this manner, the PROG pin acts as a charge enable
and can be used as a manual shutdown.
4.3
If the voltage at the V
tioning threshold, the MCP73831/2 enter a precondi-
tioning or Trickle Charge mode. The preconditioning
threshold is factory set. Refer to Section 1.0 “Electri-
cal Characteristics” for preconditioning threshold
options and the Product Identification System for
standard options.
In this mode, the MCP73831/2 supply a percentage of
the charge current (established with the value of the
resistor connected to the PROG pin) to the battery.
The percentage or ratio of the current is factory set.
Refer to Section 1.0 “Electrical Characteristics” for
preconditioning current options and the Product
Identification System for standard options.
When the voltage at the V
preconditioning threshold, the MCP73831/2 enter the
Constant-Current or Fast Charge mode.
4.4
During the Constant-Current mode, the programmed
charge current is supplied to the battery or load. The
charge current is established using a single resistor
from PROG to V
maintained until the voltage at the V
the regulation voltage, V
Charge Qualification
Preconditioning
Fast Charge Constant-Current
Mode
current
programming
SS
BAT
. Constant-Current mode is
© 2006 Microchip Technology Inc.
REG
pin is less than the precondi-
.
BAT
SS
. If the PROG pin is
pin rises above the
resistor
BAT
BAT
pin reaches
must
pin, the
be