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| MAX1501 Datasheet, PDF (13/15 Pages) Maxim Integrated Products – Highly Integrated, Linear Battery Charger with Thermal Regulation for Portable Applications | |||
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Highly Integrated, Linear Battery Charger with
Thermal Regulation for Portable Applications
4.75V TO 6.5V
AC
ADAPTER 1µF
2.8kâ¦
IN
BATT
INP
MAX1501
GLED
RLED
TMAX
SETI
TEMP
ACOK
FULLI
SELV
VL
MODE
CHGEN GND GND
4.5V 3-CELL NiMH
OR NiCd
10µF
AC
5.25V TO 6.5V
ADAPTER 1µF
VI/O
RPULLUP
µP
2.8kâ¦
IN
BATT
INP
MAX1501
GLED
RLED
ACOK
CHGEN
SETI
TMAX
TEMP
FULLI
VL
SELV
MODE
GND GND
4.95V
3-CELL NiMH
OR NiCd
10µF
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
100k⦠pullup resistor from ACOK to the logic supply
voltage of the µP. The logic supply voltage must be
less than 5.5V.
AC
4.75V TO 6.5V
ADAPTER 1µF
VI/O
100kâ¦
µP
2.8kâ¦
4.1V 1-CELL Li+ OR
4.5V 3-CELL NiMH/NiCd
IN
BATT
INP
10µF
MAX1501
GLED
RLED
ACOK
CHGEN
MODE
SETI
VL
FULLI
TMAX
SELV
TEMP
GND GND
Figure 7. µP-Based NiMH or NiCd Battery Charge
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 100k⦠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. RSETI sets the maximum output current.
4.5V TO 6.5V
1µF
CURRENT-LIMIT
ADJUST
UP TO 1.4A
IN
BATT
INP
GLED
MAX1501 RLED
FULLI
TEMP
TMAX
SETI
VL
CHGEN
MODE
ACOK
SELV
GND GND
4V
10µF
ON
OFF
Figure 8. µP-Based Single Li+/3-Cell NiMH/NiCd Battery
Charger
Figure 9. Input Overvoltage-Protected and Current-Limited
Low-Dropout Linear Regulator
______________________________________________________________________________________ 13
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