STEVAL-ISA076V1 STMicroelectronics, STEVAL-ISA076V1 Datasheet - Page 12

• Manufacturer Part Number: STEVAL-ISA076V1
• Description: BOARD DEMO BATT CHRGR L6924D
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ISA076V1

• Design Resources: STEVAL-ISA076V1 Bill of Materials STEVAL-ISA076V1 Gerber Files STEVAL-ISA076V1 Schematics
• Featured Product: STM32 Cortex-M3 Companion Products
• Main Purpose: Power Management, Battery Charger
• Embedded: No
• Utilized Ic / Part: L6924D
• Primary Attributes: 1 Cell- Li-Ion / Li-Pol, 4.1V or 4.2V @ 1A, 12V Input
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11036

Operation description
6.1
12/38
When the V
different functions:
●
●
Battery disconnection control is provided thanks to the differentiated sensing and forcing
output pins. A small current is sunk and forced through V
battery, the IC goes into a standby mode.
Figure 5
mA (R
Figure 5.
Linear mode
When operating in linear mode, the device works in a way similar to a linear regulator with a
constant current limit protection.
It charges the battery in three phases:
●
●
●
V
of the L6924D. If the battery voltage is lower than a set pre-charge voltage (V
pre-charge phase takes place. The battery is pre-charged with a low current I
(Chapter 7.2 on page
When the battery voltage goes higher than V
charge current I
Finally, when the battery voltage is close to the regulated output voltage V
4.2 V), the voltage regulation phase takes place and the charging current is reduced. The
ADP
0.50 0
0.45 0
0.40 0
0.35 0
0.30 0
0.25 0
0.20 0
0.15 0
0.10 0
0.05 0
0.00 0
If the voltage across V
notified by the status pin, but the charging process is not disabled. The charge process
ends when the maximum charging time expires.
If the voltage at V
Pre-charging current (“Pre-Charge” phase).
Constant current (“Fast-Charge” phase).
Constant voltage (“Voltage Regulation” phase).
is the output voltage of the upstream AC-DC adapter that is, in turn, the input voltage
PRG
0
shows the real charging profile of a Li-Ion battery, with a fast charge current of 450
= 26 kΩ),
PRE
Li-Ion charging profile
CHG
pin is not used to program the Pre-Charge voltage threshold, it has two
, set through an external resistor
2 00
17).
PRE
pin false under 0.5 V the timer is reset on the falling edge.
PRE
Doc ID 11908 Rev 9
pin is lower than 0.8 V, when I < I
400
C harging profile
Charging tim e (sec )
60 0
PRETH
, the battery is charged with the fast
(Chapter 7.4 on page
OUT
8 00
. If V
ENDTH
OSNS
10 00
, the end of charge is
doesn’t detect the
OPRGTH
18).
PRETH
PRE
Ichg
Vb att
1 200
(4.1 V or
), the
L6924D
4.50 0
4.00 0
3.50 0
3.00 0
2.50 0
2.00 0
1.50 0
1.00 0
0.50 0
0.00 0