MCP73831EV Microchip Technology, MCP73831EV Datasheet - Page 13

• Manufacturer Part Number: MCP73831EV
• Description: BOARD DEMO FOR MCP73831
• Manufacturer: Microchip Technology
• Type: Battery Managementr

Specifications of MCP73831EV

• Main Purpose: Power Management, Battery Charger
• Utilized Ic / Part: MCP73831
• Product: Power Management Modules
• Kit Contents: 2x MCP73831 Evaluation Boards, Users Guide, Data Sheet
• Features: Automatic Charge Termination, Charge Current Monitor, Preconditioning Of Deeply Depleted Cells
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• For Use With/related Products: MCP73831
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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 oper-
ational.
© 2008 Microchip Technology Inc.
DEVICE OVERVIEW
Undervoltage Lockout (UVLO)
STAT = HIGH (MCP73831)
STAT = Hi-Z (MCP73832)
CONSTANT VOLTAGE
Charge Current = I
controllers.
Charge Voltage = V
CHARGE COMPLETE
Charge Current = I
PRECONDITIONING
SHUTDOWN MODE
No Charge Current
PROG > 200 kΩ
FAST CHARGE
V
STAT = LOW
STAT = LOW
STAT = LOW
STAT = Hi-Z
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
> V
< V
PTH
RTH
the
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. Whenever the input
supply is below the UVLO threshold or within +50 mV
of the voltage at the V
placed in a Shutdown mode.
During any UVLO condition, the battery reverse
discharge current will be less than 2 µA.
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
or floating, the MCP73831/2 are disabled and the
battery reverse discharge current is less than 2 µA. 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
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
regulation voltage, V
Charge Qualification
Preconditioning
Fast Charge Constant-Current
Mode
current
“Electrical
programming
REG
SS
BAT
MCP73831/2
. Constant-Current mode is
BAT
.
pin is less than the precondi-
SS
pin, the MCP73831/2 are
BAT
. If the PROG pin is open
Characteristics”
pin rises above the
resistor
BAT
DS21984E-page 13
pin reaches the
must
for
be