ADP2291ARMZ-R7 Analog Devices Inc, ADP2291ARMZ-R7 Datasheet - Page 14

• Manufacturer Part Number: ADP2291ARMZ-R7
• Description: IC CHARGER LI-ION 4.2V 8MSOP
• Manufacturer: Analog Devices Inc

Specifications of ADP2291ARMZ-R7

• Battery Type: Lithium-Ion (Li-Ion)
• Function: Charge Management
• Voltage - Supply: 4.5 V ~ 12 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Input Voltage: 12V
• Battery Charge Voltage: 4.2V
• Charge Current Max: 1.5A
• Battery Ic Case Style: MSOP
• No. Of Pins: 8
• No. Of Series Cells: 1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: ADP2291-EVAL - BOARD EVAL FOR ADP2291LI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: ADP2291ARMZ-R7; ADP2291ARMZ-R7TR

ADP2291
TYPICAL APPLICATION CIRCUIT
A typical application circuit is shown in Figure 22. The circuit is
capable of a 750 mA charge current for an input voltage of 4.5 V
to 6 V. Higher input voltages can be used, but the increased power
dissipation of the pass device must be taken into account.
4.6V–12V
CHARGE TERMINATION
In some applications, the charger is required to terminate charg-
ing when the EOC threshold is reached. Automatic charger
restart is not desired. Adding components R1, C1, and Q2
terminates charging when the CHG pin opens and prevents
further charging until the adapter is removed and reasserted.
SELECTABLE CHARGE CURRENT
In applications where the charge current needs to be selectable,
use the circuit shown in Figure 24. This circuit allows a proces-
sor to determine if the charge current needs to be reduced due
to an input source limitation or a different battery capacity
option or simply to reduce the stress on the pass transistor.
R2 and Q2 allow the charge current to be selected between
high, which results in a charge current of 750 mA; and low,
which results in a charge current of 250 mA.
4.6V–12V
INPUT
INPUT
BAT1000
BAT1000
2.2µF
D1
2.2µF
CIN
D1
CIN
500kΩ
Figure 22. Typical Application Circuit
R1
Figure 23. Self-Termination Circuit
CTIMER
200mΩ
100nF
IN
CHG
CTIMER
RS
200mΩ
100nF
IN
CHG
RS
TIMER
100nF
CS
ADP2291
TIMER
C1
CS
ADP2291
FZT549
DRV
ADJ
Q1
FZT549
Q2
2N7002
DRV
ADJ
Q1
GND
BAT
GND
BAT
COUT
10µF
COUT
10µF
+
LI-ION
CELL
Rev. A | Page 14 of 20
+
4.6V–12V
THERMAL PROTECTION
In applications where the overall size must be small or the input
voltage range is wide, adding thermal regulation is suggested.
This allows the charger to monitor the temperature of the pass
device and decrease the charge current as the temperature
increases. By adding an NTC thermistor to the ADJ pin, it is
possible to accomplish this; however, care is still required to
ensure that the power dissipation of the pass device is not
exceeded.
4.6V–12V
Some suggested NTC thermistor suppliers are listed in Table 6.
Table 6. NTC Thermistor Manufacturers
Vendor
BetaTHERM
Murata
Panasonic
Vishay
INPUT
INPUT
BAT1000
BAT1000
2.2µF
2.2µF
D1
D1
CIN
CIN
LOW/HIGH
Figure 24. Selectable Charge Current Circuit
Part Number
SMD2500KJ435J
NCP18WM474J
ERTJ0EV474J
2322 615 1.474
Figure 25. Thermal Regulation Circuit
CTIMER
CTIMER
200mΩ
200mΩ
100nF
100nF
RS
IN
CHG
RS
IN
CHG
TIMER
TIMER
CS
CS
ADP2291
ADP2291
FZT549
FZT549
DRV
ADJ
DRV
ADJ
Q1
Q1
Website
www.betatherm.com
www.murata .com
www.panasonic.com
www.vishay.com
R2
100kΩ
Q2
2N7002
R1
470k
NTC LOCATED
NEAR Q1
R2
100k
GND
GND
BAT
BAT
COUT
10µF
COUT
10µF
+
+
LI-ION
CELL
LI-ION
CELL