MAX1501 Maxim Integrated Products, MAX1501 Datasheet - Page 13

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

Figure 6. Stand-Alone 3-Cell NiMH or NiCd Battery Charger
Figure 6 shows the MAX1501 as a stand-alone
NiMH/NiCd battery charger. Connecting SELV to GND
sets the charge termination voltage to 4.5V.
Figure 7 shows the MAX1501 as a µP-based
NiMH/NiCd battery charger. Connecting SELV to VL
sets the charge regulation voltage at 4.95V. Connect a
100kΩ pullup resistor from ACOK to the logic supply
voltage of the µP. The logic supply voltage must be
less than 5.5V.
Figure 8. µP-Based Single Li+/3-Cell NiMH/NiCd Battery
Charger
ADAPTER
Highly Integrated, Linear Battery Charger with
ADAPTER
AC
AC
Thermal Regulation for Portable Applications
V
µP
I/O
1µF
1µF
4.75V TO 6.5V
4.75V TO 6.5V
100k Ω
2.8kΩ
2.8kΩ
______________________________________________________________________________________
IN
INP
GLED
RLED
ACOK
CHGEN
MODE
SETI
IN
INP
GLED
RLED
TMAX
SETI
CHGEN
MAX1501
MAX1501
GND GND
GND GND
TMAX
FULLI
TEMP
MODE
BATT
SELV
TEMP
ACOK
FULLI
BATT
SELV
VL
VL
4.5V 3-CELL NiMH/NiCd
4.1V 1-CELL Li+ OR
10µF
10µF
4.5V 3-CELL NiMH
OR NiCd
Figure 8 shows the MAX1501 as a µP-based single Li+ or
3-cell NiMH/NiCd charger. The states of MODE and
CHGEN set the operating mode of the MAX1501 (Table 1).
Connect a 100kΩ pullup resistor from ACOK to the logic
supply voltage of the µP. The logic supply voltage must be
less than 5.5V.
Figure 9 shows the MAX1501 as an accurate current-
limited low-dropout linear regulator with input overvolt-
age protection (no-battery mode). The output voltage
regulates to 4V, regardless of the state of SELV.
Connect MODE to VL to enable the linear regulator.
Connect MODE to GND to put the device into shut-
down. R
Figure 7. µP-Based NiMH or NiCd Battery Charge
Figure 9. Input Overvoltage-Protected and Current-Limited
Low-Dropout Linear Regulator
ADAPTER
AC
CURRENT-LIMIT
UP TO 1.4A
ADJUST
V
SETI
µP
I/O
1µF
4.5V TO 6.5V
1µF
sets the maximum output current.
5.25V TO 6.5V
R
PULLUP
2.8kΩ
IN
INP
FULLI
TEMP
TMAX
SETI
MAX1501
IN
INP
GLED
RLED
ACOK
CHGEN
SETI
GND
MAX1501
GND GND
GND
CHGEN
MODE
MODE
ACOK
TMAX
GLED
TEMP
FULLI
RLED
BATT
SELV
BATT
SELV
VL
VL
4V
OFF
10µF
3-CELL NiMH
10µF
ON
OR NiCd
4.95V
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