Datasheet LTC4001 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 2A Synchronous Buck Li-Ion Charger |
| Páginas / Página | 20 / 1 — FEATURES. DESCRIPTIO. Low Power Dissipation. 2A Maximum Charge Current. … |
| Formato / tamaño de archivo | PDF / 241 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTIO. Low Power Dissipation. 2A Maximum Charge Current. No External MOSFETs, Sense Resistor or Blocking
Línea de modelo para esta hoja de datos
Versión de texto del documento
LTC4001 2A Synchronous Buck Li-Ion Charger
U FEATURES DESCRIPTIO
■
Low Power Dissipation
The LTC®4001 is a 2A Li-Ion battery charger intended for ■
2A Maximum Charge Current
5V wall adapters. It utilizes a 1.5MHz synchronous buck ■
No External MOSFETs, Sense Resistor or Blocking
converter topology to reduce power dissipation during
Diode Required
charging. Low power dissipation, an internal MOSFET and ■
Remote Sensing at Battery Terminals
sense resistor allow a physically small charger that can be ■ Programmable Charge Termination Timer embedded in a wide range of handheld applications. The ■ Preset 4.2V Float Voltage with ±0.5% Accuracy LTC4001 includes complete charge termination circuitry, ■ Programmable Charge Current Detection/Termination automatic recharge and a ±1% 4.2V float voltage. Input ■ Automatic Recharge short-circuit protection is included so no blocking diode is ■ Thermistor Input for Temperature Qualified Charging required. ■ Compatible with Current Limited Wall Adapters Battery charge current, charge timeout and end-of-charge ■ Low Profile 16-Lead (4mm × 4mm) QFN Package
U
indication parameters are set with external components.
APPLICATIO S
Additional features include shorted cell detection, tempera- ture qualified charging and overvoltage protection. The ■ Handheld Battery-Powered Devices LTC4001 is available in a low profile (0.75mm) 16-lead ■ Handheld Computers (4mm × 4mm) QFN package. ■ Charging Docks and Cradles , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ Digital Cameras All other trademarks are the property of their respective owners. ■ Smart Phones
U TYPICAL APPLICATIO 2A Single Cell Li-Ion Battery Charger
1.5µH
Power Loss vs VBAT Charging (PWM Mode)
SW SENSE 1.25 VINSENSE BATSENS VIN PVIN BAT 4.5V TO 5.5V + 10µF 4.2V 10µF 1.00 Li-Ion PGND LTC4001 0.75 CHRG NTC 0.50 FAULT DISSIPATION (W) EN 0.25 PROG IDET TIMER SS GNDSENS TOTAL APPLICATION CIRCUIT POWER VIN = 5V 0.22µF 2A CHARGER 0 274Ω 0.1µF 3 3.25 3.5 3.75 4 4.25 V 4001 TA01a BAT (V) 4001 TA01b 4001f 1
U FEATURES DESCRIPTIO
■
Low Power Dissipation
The LTC®4001 is a 2A Li-Ion battery charger intended for ■
2A Maximum Charge Current
5V wall adapters. It utilizes a 1.5MHz synchronous buck ■
No External MOSFETs, Sense Resistor or Blocking
converter topology to reduce power dissipation during
Diode Required
charging. Low power dissipation, an internal MOSFET and ■
Remote Sensing at Battery Terminals
sense resistor allow a physically small charger that can be ■ Programmable Charge Termination Timer embedded in a wide range of handheld applications. The ■ Preset 4.2V Float Voltage with ±0.5% Accuracy LTC4001 includes complete charge termination circuitry, ■ Programmable Charge Current Detection/Termination automatic recharge and a ±1% 4.2V float voltage. Input ■ Automatic Recharge short-circuit protection is included so no blocking diode is ■ Thermistor Input for Temperature Qualified Charging required. ■ Compatible with Current Limited Wall Adapters Battery charge current, charge timeout and end-of-charge ■ Low Profile 16-Lead (4mm × 4mm) QFN Package
U
indication parameters are set with external components.
APPLICATIO S
Additional features include shorted cell detection, tempera- ture qualified charging and overvoltage protection. The ■ Handheld Battery-Powered Devices LTC4001 is available in a low profile (0.75mm) 16-lead ■ Handheld Computers (4mm × 4mm) QFN package. ■ Charging Docks and Cradles , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ Digital Cameras All other trademarks are the property of their respective owners. ■ Smart Phones
U TYPICAL APPLICATIO 2A Single Cell Li-Ion Battery Charger
1.5µH
Power Loss vs VBAT Charging (PWM Mode)
SW SENSE 1.25 VINSENSE BATSENS VIN PVIN BAT 4.5V TO 5.5V + 10µF 4.2V 10µF 1.00 Li-Ion PGND LTC4001 0.75 CHRG NTC 0.50 FAULT DISSIPATION (W) EN 0.25 PROG IDET TIMER SS GNDSENS TOTAL APPLICATION CIRCUIT POWER VIN = 5V 0.22µF 2A CHARGER 0 274Ω 0.1µF 3 3.25 3.5 3.75 4 4.25 V 4001 TA01a BAT (V) 4001 TA01b 4001f 1