ia3513 integration, ia3513 Datasheet - Page 5

• Manufacturer Part Number: ia3513
• Description: Headset Voice And Power Solution
• Manufacturer: integration

Electrical Characteristics
TA=0º to 85º
Temperature , vCHARGER and Maximum charge current
The circuit includes a foldback mode to protect against thermal failure, this way no worst case power dissipation scenarios need
to be considered since the circuit reduces the charge current to maintain the die temperature below approximately 100 ºC.
As the charger is dominant in terms of power dissipation in the circuit, the temperature for which the charge current begins to be
reduced can be, approximately calculated as follows:
Using a small board (aprox: 10cm
placement, the typical values for thermal resistance are θ
θ
Although the circuit is otherwise within specification at -20Cº the charge voltage accuracy is reduced to 1.5% below 0 ºC.
This must be taken into consideration together with battery thermal security guidelines if by any reason the charger is to be
operated bellow 0 ºC.
The above reference to the battery specification is valid for any other temperature value outside the battery maximum ratings for
charge or discharge as the battery temperature is not monitored by the IC.
Note 2
TA < 100º - (vCHARGER – 3 ) x IC x θ
JA
General
vCHARGER Supply Voltage
Maximum Charge Current C
Charge Current definition
Charge Voltage (VbatSet)
Voltage Droupout from vCHARGER (Iout=90mA)
VbatShort (below this value battery is shorted)
VbatOpen (above this value battery is open)
VbatLowest (below this value is deeply discharged)
Vrestart (value for charge restart after charge complete)
Ipre (precharge current for deeply discharged cells)
Ifinal (current value for constant voltage termination)
PM timer (precharge safety timer)
CC timer (constant current safety timer)
CV timer (constant voltage safety timer)
Safety Mode Timer
FoldBack Mode timer (FB timer)
IC temperature to enter CC fold-back mode (FBTemp)
IC temperature foldback hysteresis (FBHys)
vCHARGER pin decoupling capacitor
is dependent on the θ
R1 resistor connected between the iBAT pin and ground (page 4)
2
JBA
value for each application.
2
) with 4 layers and the package back paddle soldered to the ground plain, with maximum via
JA
JB
=14 Cº/W and θ
+100mV
4.158
Vbat
Min
100
IC= 119.3/R1
JA
1/10 C
1/10 C
= 35 Cº/W
18000
1800
7200
1800
Typ
4.2
0.4
4.3
4.0
90
10
θ
θ
θ
θ
3
5
5
JA
JA
JB
JBA
= Junction to ambient thermal resistance
= θ
= Junction to board thermal resistance
= Board to ambient thermal resistance
JB
.
+ θ
(functional@17)
JBA
4.242
Max
150
100
12
Units
mA
mV
uF
ºC
ºC
V
A
V
V
V
V
s
s
s
s
s
IA3513
5