HM4066-4.2 /8.4/ 8.34
Switch Mode Li-Ion/Polymer
Battery Charger
DESCRIPTION
FEATURES
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Wide Input Supply Voltage Range:
The HM4066 is a constant current, constant voltage
Li-Ion battery charger controller that uses a current mode
PWM step-down (buck) switching architecture. With a
500kHz switching frequency, the HM4066 provides a
small, simple and efficient solution to fast charge one
(4.2V) or two (8.4V) cell lithium-ion batteries.
4.8V to 20V – 4.2 Version
8.9V to 20V – 8.4 Version
8.9V to 20V – 8.34 Version
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500kHz Switching Frequency
End-of-Charge Current Detection Output
12 Hour Charge Termination Timer
±1% Charge Voltage Accuracy
±10% Charge Current Accuracy
Low 10µA Reverse Battery Drain Current
Automatic Battery Recharge
The HM4066 charges the battery in three phases:
conditioning, constant current, and constant voltage. An
external sense resistor sets the charge current with ±10%
accuracy. An internal resistor divider and precision
reference set the final float voltage to 4.2V per cell with ±
1% accuracy. An internal comparator detects the near
end-of-charge condition while an internal timer sets the
total charge time and terminates the charge cycle. The
HM4066 automatically re-starts the charge if the battery
voltage falls below an internal threshold, 4.05V per cell.
The HM4066 also automatically enters sleep mode when
DC supplies are removed.
Automatic Trickle Charging of Low Voltage
Batteries
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Automatic Sleep Mode for Low Power
Consumption
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Battery Temperature Sensing
Stable with Ceramic Output Capacitor
Support up to 3A Charge Current
8-Lead SOP Package
The HM4066 is available in the 8-lead SOP package.
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
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Small Notebook Computer
Portable DVD
Typical Operating Performance
Handheld Instruments
Efficiency vs Input voltage
Efficiency vs Input voltage
100
95
90
85
80
75
70
65
60
100
(Curves include input diode)
(Curves include input diode)
95
90
85
80
75
70
HM4066-8.4
HM4066-4.2
VBAT=3.8V
VBAT=4.0V
VBAT=7.0V
VBAT=8.0V
65
60
5
10
15
20
8
10
12
14
16
18
20
Input Voltage (V)
Input Voltage (V)
1