KB4540 Datasheet PDF - Kingbor Technology
| Part Number | KB4540 | |
| Description | Li-Ion Battery Charger | |
| Manufacturers | Kingbor Technology | |
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Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB4540
Li-Ion Battery Charger
FEATURES
■ Programmable Charge Current Up to 800mA
■ No MOSFET, Sense Resistor or Blocking
Diode Required
■ Complete Linear Charger in SOT Package for
Single Cell Lithium-Ion Batteries
■ Constant-Current/Constant-Voltage Operation with
Thermal Regulation to Maximize Charge Rate
Without Risk of Overheating
■ Charges Single Cell Li-Ion Batteries Directly
from USB Port
■ Preset 4.2V Charge Voltage with ±1% Accuracy
■ Charge Current Monitor Output for Gas
Gauging
■ Automatic Recharge
■ Charge Status Output Pin
■ C/10 Charge Termination
■ 25µA Supply Current in Shutdown
■ 2.9V Trickle Charge Threshold (KB4540)
■ Available Without Trickle Charge (KB4540X)
■ Soft-Start Limits Inrush Current
■ Available in SOT23-5 Package
■ Cellular Telephones, PDAs, MP3 Players
■ Charging Docks and Cradles
■ Bluetooth Applications
DESCRIPTION
The KB 4540 is a complete constant-current/constant-
voltage linear charger for single cell lithium-ion batteries.
Its ThinSOT package and low external component count
make the KB4540 ideally suited for portable applications.
Furthermore, the KB4540 is specifically designed to work
within USB power specifications.
No external sense resistor is needed, and no blocking
diode is required due to the internal MOSFET architecture.
Thermal feedback regulates the charge current to limit the
die temperature during high power operation or high
ambient temperature. The charge voltage is fixed at 4.2V,
and the charge current can be programmed externally with
a single resistor. The KB4540 automatically terminates
the charge cycle when the charge current drops to 1/10th
the programmed value after the final float voltage is
reached.
When the input supply (wall adapter or USB supply) is
removed, the KB4540 automatically enters a low current
state, dropping the battery drain current to less than 2µA.
The KB4540 can be put into shutdown mode, reducing
the supply current to 25µA.
Other features include charge current monitor, undervoltage
lockout, automatic recharge and a status pin to indicate
charge termination and the presence of an input voltage.
TYPICAL APPLICATION
330Ω
500mA Single Cell Li-Ion Charger
VIN
4.5V TO 6.5V
1µF 4
VCC BAT 3
KB4540-4.2
1
CHRG
5
PROG
GND
2
2k
500mA
4.2V
Li-Ion
BATTERY
ICHG =
VPROG
R PROG
X 1000
(V PROG =1V)
www.DataSheet.in
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Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
TYPICAL PERFORMANCE CHARACTERISTICS
KB4540
CHRG Pin Current vs Temperature
(Weak Pull-Down State)
28
VCC = 5V
VBAT = 4.3V
25 VCHRG = 5V
23
19
16
13
10
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
Trickle Charge Current
vs Temperature
50
RPROG = 2k
40
30
VCC = 5V
VBAT = 2.5V
20
10
RPROG = 10k
0
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
Trickle Charge Current vs
Supply Voltage
50
RPROG = 2k
40
30
VBAT = 2.5V
TA = 25°C
20
10 RPROG = 10k
0
4.0 4.5 5.0 5.5 6.0
VCC (V)
6.5 7.0
Trickle Charge Threshold vs
Temperature
3.000
VCC = 5V
2.975 RPROG = 10k
2.950
2.925
2.900
2.875
2.850
2.825
2.800
–50 –25 0
25 50
TEMPERATURE (°C)
75
100
Charge Current vs Ambient
Temperature
600
RPROG = 2k
500
400
VCC = 5V
300 VBAT = 4V
θJA = 80°C/W
200
ONSET OF
THERMAL
REGULATION
RPROG = 10k
100
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
Charge Current vs Battery Voltage
600
TA = 0°C
500
400 TA = 40°C
TA = 25°C
300
200
100
VCC = 5V
θJA = 125°C/W
RPROG = 2k
0
2.7 3.0 3.3 3.6 3.9 4.2 4.5
VBAT (V)
Recharge Voltage Threshold
vs Temperature
4.11
VCC = 5V
4.09 RPROG = 10k
4.07
4.05
4.03
4.01
3.99
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
Charge Current vs Supply Voltage
600
RPROG = 2k
500
400
VBAT = 4V
300 TA = 25°C
θJA = 80°C/W
ONSET OF
THERMAL
REGULATION
200
RPROG = 10k
100
0
4.0 4.5 5.0 5.5 6.0
VCC (V)
6.5 7.0
Power FET “ON” Resistance
vs Temperature
700
VCC = 4.2V
650
IBAT = 100mA
RPROG = 2k
600
550
500
450
400
350
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for KB4540 electronic component. |
| Information | Total 15 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ KB4540.PDF Datasheet ] | |
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