Datasheet LTC4002 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | Standalone Li-Ion Switch Mode Battery Charger |
| Páginas / Página | 16 / 1 — FEATURES. DESCRIPTIO. Wide Input Supply Range:. 4.7V to 22V – 4.2 … |
| Formato / tamaño de archivo | PDF / 174 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTIO. Wide Input Supply Range:. 4.7V to 22V – 4.2 Version. 8.9V to 22V – 8.4 Version
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LTC4002 Standalone Li-Ion Switch Mode Battery Charger
U FEATURES DESCRIPTIO
■
Wide Input Supply Range:
The LTC®4002 is a complete battery charger controller for
4.7V to 22V – 4.2 Version
one (4.2V) or two (8.4V) cell lithium-ion batteries. With a
8.9V to 22V – 8.4 Version
500kHz switching frequency, the LTC4002 provides a ■
High Efficiency Current Mode PWM Controller with
small, simple and efficient solution to fast charge Li-Ion
500kHz Switching Frequency
batteries from a wide range of supply voltages. An external ■ ±
1% Charge Voltage Accuracy
sense resistor sets the charge current with ±5% accuracy. ■
End-of-Charge Current Detection Output
An internal resistor divider and precision reference set the ■
3 Hour Charge Termination Timer
final float voltage to 4.2V per cell with ±1% accuracy. ■ Constant Switching Frequency for Minimum Noise When the input supply is removed, the LTC4002 automati- ■ ±5% Charge Current Accuracy cally enters a low current sleep mode, dropping the battery ■ Low 10µA Reverse Battery Drain Current drain current to 10µA. An internal comparator detects the ■ Automatic Battery Recharge near end-of-charge condition while an internal timer sets ■ Automatic Shutdown When Input Supply is Removed the total charge time and terminates the charge cycle. After ■ Automatic Trickle Charging of Low Voltage Batteries the charge cycle ends, if the battery voltage drops below ■ Battery Temperature Sensing and Charge 4.05V per cell, a new charge cycle will automatically begin. Qualification ■ Stable with Ceramic Output Capacitor The LTC4002 is available in the 8-lead SO and 10-lead DFN ■ 8-Lead SO and 10-Lead DFN Packages packages. , LTC and LT are registered trademarks of Linear Technology Corporation.
U
All other trademarks are the property of their respective owners.
APPLICATIO S
■ Portable Computers ■ Charging Docks ■ Handheld Instruments
U TYPICAL APPLICATIO 1.5A Single Cell Li-Ion Battery Charger Efficiency vs Input Voltage
VIN 100 5V TO 22V (CURVES INCLUDE INPUT DIODE) 90 VBAT = 4V 0.1µF 10µF VCC BAT GATE 80 VBAT = 3.8V 2k LTC4002ES8-4.2 EFFICIENCY (%) CHARGE 6.8µH STATUS 70 CHRG SENSE 68mΩ 60 COMP BAT 5 10 15 20 25 NTC GND + INPUT VOLTAGE (V) 0.47µF Li-Ion 22µF BATTERY 4002 TA02 2.2k 10k 4002 TA01 T NTC NTC: DALE NTHS-1206N02 4002f 1
U FEATURES DESCRIPTIO
■
Wide Input Supply Range:
The LTC®4002 is a complete battery charger controller for
4.7V to 22V – 4.2 Version
one (4.2V) or two (8.4V) cell lithium-ion batteries. With a
8.9V to 22V – 8.4 Version
500kHz switching frequency, the LTC4002 provides a ■
High Efficiency Current Mode PWM Controller with
small, simple and efficient solution to fast charge Li-Ion
500kHz Switching Frequency
batteries from a wide range of supply voltages. An external ■ ±
1% Charge Voltage Accuracy
sense resistor sets the charge current with ±5% accuracy. ■
End-of-Charge Current Detection Output
An internal resistor divider and precision reference set the ■
3 Hour Charge Termination Timer
final float voltage to 4.2V per cell with ±1% accuracy. ■ Constant Switching Frequency for Minimum Noise When the input supply is removed, the LTC4002 automati- ■ ±5% Charge Current Accuracy cally enters a low current sleep mode, dropping the battery ■ Low 10µA Reverse Battery Drain Current drain current to 10µA. An internal comparator detects the ■ Automatic Battery Recharge near end-of-charge condition while an internal timer sets ■ Automatic Shutdown When Input Supply is Removed the total charge time and terminates the charge cycle. After ■ Automatic Trickle Charging of Low Voltage Batteries the charge cycle ends, if the battery voltage drops below ■ Battery Temperature Sensing and Charge 4.05V per cell, a new charge cycle will automatically begin. Qualification ■ Stable with Ceramic Output Capacitor The LTC4002 is available in the 8-lead SO and 10-lead DFN ■ 8-Lead SO and 10-Lead DFN Packages packages. , LTC and LT are registered trademarks of Linear Technology Corporation.
U
All other trademarks are the property of their respective owners.
APPLICATIO S
■ Portable Computers ■ Charging Docks ■ Handheld Instruments
U TYPICAL APPLICATIO 1.5A Single Cell Li-Ion Battery Charger Efficiency vs Input Voltage
VIN 100 5V TO 22V (CURVES INCLUDE INPUT DIODE) 90 VBAT = 4V 0.1µF 10µF VCC BAT GATE 80 VBAT = 3.8V 2k LTC4002ES8-4.2 EFFICIENCY (%) CHARGE 6.8µH STATUS 70 CHRG SENSE 68mΩ 60 COMP BAT 5 10 15 20 25 NTC GND + INPUT VOLTAGE (V) 0.47µF Li-Ion 22µF BATTERY 4002 TA02 2.2k 10k 4002 TA01 T NTC NTC: DALE NTHS-1206N02 4002f 1