ADM00313 Microchip Technology, ADM00313 Datasheet - Page 14

• Manufacturer Part Number: ADM00313
• Description: Power Management IC Development Tools 73830L Li-Ion Battry Charger Eval Brd
• Manufacturer: Microchip Technology

Specifications of ADM00313

• Rohs: yes

MCP73830/L
5.4
During Constant Current mode, the programmed
charge current is supplied to the battery or load.
The charge current is established using a single resis-
tor from PROG to V
charge current are calculated using the following
equation:
EQUATION 5-1:
EQUATION 5-2:
Constant Current mode is maintained until the voltage
at the V
When Constant Current mode is invoked, the internal
timer is reset.
5.4.1
If the internal 4-hour timer expires before the recharge
voltage threshold is reached, a timer fault is indicated
and the charge cycle terminates. The MCP73830/L
devices remain in this condition until the battery is
reinserted, or the input power or CE is cycled.
5.5
When voltage at the V
voltage, V
The regulation voltage is factory set to 4.2V, with a
tolerance of ±0.75%.
5.6
The charge cycle is terminated when, during Constant
Voltage mode, the average charge current diminishes
below a threshold established with the value of 7.5%,
10% of fast charge current, or the internal timer has
expired. A 1 ms filter time on the termination compara-
tor ensures that transient load conditions do not result
in premature charge cycle termination. The timer
DS25049B-page 14
Where:
Where:
R
R
PROG
PROG
I
I
REG
REG
BAT
Constant Current Mode – Fast
Charge
Constant Voltage Mode
Charge Termination
REG
TIMER EXPIRED DURING
CONSTANT CURRENT – FAST
CHARGE MODE
pin reaches the regulation voltage, V
, the constant voltage regulation begins.
=
=
=
=
I REG
I REG
SS
kilo-ohms (k)
milliampere (mA)
kilo-ohms (k)
milliampere (mA)
MCP73830L
MCP73830
. The program resistor and the
BAT
=
=
pin reaches the regulation
--------------------
R PROG
--------------------
R PROG
1000
200
REG
.
period is factory set and no timer option is available.
Refer to
timer period options.
5.7
MCP73830/L devices with automatic recharge options
continuously monitor the voltage at the V
the Charge Complete mode. If the voltage drops below
the recharge threshold, another charge cycle begins,
and current is once again supplied to the battery or
load. The recharge threshold is factory set. Refer to
Section 1.0 “Electrical Characteristics”
threshold options.
For the MCP73830/L with no recharge option, the
devices will go into Standby mode when a termination
condition is met. The charge will not restart until one of
the following conditions is met:
• Battery is removed from the system and inserted
• V
• CE is cycled.
5.8
The MCP73830/L should limit the charge currents
based on the die temperature. The thermal regulation
optimizes the charge cycle time while maintaining
device reliability.
regulation for the MCP73830/L devices. Refer to
Section 1.0 “Electrical Characteristics”
package resistances, and
Considerations”
.
FIGURE 5-1:
Note:
again.
DD
is removed and plugged in again
300
250
200
150
100
50
Section 1.0 “Electrical Characteristics”
Automatic Recharge
Thermal Regulation
0
0
The MCP73830/L also offer options with
no automatic recharge.
30
for calculating power dissipation.
Figure 5-1
Junction Temperature (C)
Thermal Regulation.
 2011 Microchip Technology Inc.
60
Section 6.1.1.2 “Thermal
Mimimum
depicts the thermal
90
120
BAT
for recharge
Maximum
for thermal
pin during
150
for