MAX8671XETL+ Maxim Integrated Products, MAX8671XETL+ Datasheet - Page 40

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MAX8671XETL+

Manufacturer Part Number
MAX8671XETL+
Description
IC PMIC W/CHARGER 40-TQFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8671XETL+

Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
Voltage - Supply
4.1 V ~ 6.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
40-WFQFN Exposed Pad
Mounting Style
SMD/SMT
Input Voltage
2.6 V to 6.6 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Output Current
0.5 A
Output Voltage
0.6 V to 5 V
Supply Current
0.285 mA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Since the thermistor monitoring circuit employs an
external bias resistor from THM to VL (R
14), any resistance thermistor can be used as long as
the value of R
resistance. For example, with a 10kΩ at +25°C thermis-
tor, use 10kΩ at R
mistor, use 100kΩ at R
thermistor resistance to temperature is defined by the
following equation:
Table 8. Trip Temperatures for Different Thermistors
Figure 14. Thermistor Input
40
R
R
R
Resistance at +25°C [kΩ]
Resistance at +50°C [kΩ]
Resistance at 0°C [kΩ]
Nominal Hot Trip
Temperature [°C]
Nominal Cold Trip
Temperature [°C]
TB
TP
TS
THERMISTOR BETA (ß [K])
(kΩ)
(kΩ)
______________________________________________________________________________________
(kΩ)
R
T
TB
ALTERNATE THERMISTOR
R
=
TP
R
CONFIGURATION
is equivalent to the thermistor’s +25°C
25
TB
R
×
TS
, and with a 100kΩ at +25°C ther-
T
e
β
TB
T
. The general relation of
+
R
TB
1
273
T
298
1
Open
Short
25.14
3000
4.59
VL
CEN
THM
10
10
55
-3
AGND
TB
in Figure
ESD
DIODE
Open
27.15
Short
3250
4.30
10
10
53
-1
0.74 x VL
0.284 x VL
BOTH COMPARATORS
HAVE 65mV HYSTERESIS
where:
R
perature T in Celsius
R
+25°C
β = The material constant of the thermistor that typically
ranges from 3000K to 5000K
T = The temperature of the thermistor in °C that corre-
sponds to R
T
25
= The resistance in ohms of the thermistor at tem-
= The resistance in ohms of the thermistor at
Open
29.32
Short
3500
4.03
10
10
51
0
COLD
HOT
T
Open
31.66
Short
3750
3.78
10
10
49
2
MAX8671X
TEMPERATURE
SUSPEND
Open
36.91
Short
4250
3.32
10
10
46
5
36.91
Short
4250
3.32
120
10
10
45
0

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