MAX1501 Maxim Integrated Products, MAX1501 Datasheet - Page 14

• Manufacturer Part Number: MAX1501
• Description: Highly Integrated Linear Battery Charger with Thermal Regulation for Portable Applications
• Manufacturer: Maxim Integrated Products

Figure 10 shows a circuit that adds temperature protec-
tion to the battery. Install the thermistor as close to the
battery as possible to ensure accurate temperature mea-
surement. The output of this circuit is logic high when the
battery temperature is less than 0°C and greater than
+50°C. Driving CHGEN high disables the charger.
Connect IN and INP together as close to the device as
possible and bypass with a 1µF ceramic capacitor.
Bypass BATT to GND with a 10µF ceramic capacitor.
Provide a large copper GND plane to allow the exposed
paddle to sink heat away from the device. Connect the
battery to BATT as close to the device as possible to
provide the most accurate battery voltage sensing.
Make all high-current traces short and wide to minimize
voltage drops.
Highly Integrated, Linear Battery Charger with
Thermal Regulation for Portable Applications
Figure 10. Battery Temperature Protection
14
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RT = 10kΩ
AT +25°C
5V
5.1kΩ
Layout and Bypassing
2.24kΩ
10kΩ
4.1kΩ
3.66kΩ
5V
3kΩ
3kΩ
100kΩ
100kΩ
TRANSISTOR COUNT: 5717
PROCESS: BiCMOS
**CONNECT EXPOSED PADDLE TO GND
1kΩ
1kΩ
200kΩ
GND
SETI
INP
IN
1
2
3
4
16
3kΩ
5
+25°C
+50°C
**EXPOSED PADDLE
T
0°C
BATT
5mm x 5mm
THIN QFN
MAX1501
15
6
CHGEN
27.28kΩ
10.00kΩ
4.16kΩ
Pin Configuration
Chip Information
R
14
MAX1501
7
T
GND
IN
13
8
12
11
10
9
BATT
ACOK
CHGEN
MODE