Datasheet LTC4001-1 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 2A Synchronous Buck Li-Ion Charger |
| Pages / Page | 20 / 1 — FEATURES. DESCRIPTION. Low Power Dissipation. 2A Maximum Charge Current. … |
| File Format / Size | PDF / 236 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Low Power Dissipation. 2A Maximum Charge Current. No External MOSFETs, Sense Resistor or
Model Line for this Datasheet
Text Version of Document
LTC4001-1 2A Synchronous Buck Li-Ion Charger
FEATURES DESCRIPTION
n
Low Power Dissipation
The LTC®4001-1 is a 2A Li-Ion battery charger intended for n
2A Maximum Charge Current
5V wall adapters. It utilizes a 1.5MHz synchronous buck n
No External MOSFETs, Sense Resistor or
converter topology to reduce power dissipation during
Blocking Diode Required
charging. Low power dissipation, an internal MOSFET and n
Remote Sensing at Battery Terminals
sense resistor allow a physically small charger that can be n Programmable Charge Termination Timer embedded in a wide range of handheld applications. The n Preset 4.1V Float Voltage with ±0.5% Accuracy LTC4001-1 includes complete charge termination circuitry, n 4.1V Float Voltage Improves Battery Life and High automatic recharge and a ±1% 4.1V fl oat voltage. Input Temperature Safety Margin short-circuit protection is included so no blocking diode n Programmable Charge Current Detection/ is required. Termination This 4.1V version of the standard LTC4001 is intended n Automatic Recharge for applications which will be operated or stored above n Thermistor Input for Temperature Qualifi ed approximately 60°C. Under these conditions, the reduced Charging fl oat voltage will trade-off initial cell capacity for the benefi t n Compatible with Current Limited Wall Adapters of increased capacity retention over the life of the battery. A n Low Profi le 16-Lead (4mm × 4mm) QFN Package reduced fl oat voltage also minimizes swelling in prismatic
APPLICATIONS
and polymer cells, and avoids open CID (pressure fuse) in cylindrical cells. n Handheld Battery-Powered Devices Battery charge current, charge timeout and end-of-charge n Handheld Computers indication parameters are set with external components. n Charging Docks and Cradles Additional features include shorted cell detection, tempera- n Digital Cameras ture qualifi ed charging and overvoltage protection. The n Smart Phones LTC4001-1 is available in a low profi le (0.75mm) 16-lead L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other (4mm × 4mm) QFN package. trademarks are the property of their respective owners.
TYPICAL APPLICATION Power Loss vs VBAT 2A Single Cell Li-Ion Battery Charger Charging (PWM Mode)
1.5μH 1.25 SW SENSE 1.00 VINSENSE BATSENS VIN PVIN BAT 4.5V TO 5.5V + 10μF 4.1V 10μF Li-Ion 0.75 PGND TION (W) A TION CIRCUIT POWER LTC4001-1 0.50 CHRG DISSIP NTC AL APPLICA 0.25 FAULT TOT VIN = 5V EN 2A CHARGER PROG IDET TIMER SS GNDSENS 0 3 3.25 3.5 3.75 4 4.25 0.22μF VBAT (V) 40011 TA01b 274Ω 0.1μF 40011 TA01a 40011fa 1
FEATURES DESCRIPTION
n
Low Power Dissipation
The LTC®4001-1 is a 2A Li-Ion battery charger intended for n
2A Maximum Charge Current
5V wall adapters. It utilizes a 1.5MHz synchronous buck n
No External MOSFETs, Sense Resistor or
converter topology to reduce power dissipation during
Blocking Diode Required
charging. Low power dissipation, an internal MOSFET and n
Remote Sensing at Battery Terminals
sense resistor allow a physically small charger that can be n Programmable Charge Termination Timer embedded in a wide range of handheld applications. The n Preset 4.1V Float Voltage with ±0.5% Accuracy LTC4001-1 includes complete charge termination circuitry, n 4.1V Float Voltage Improves Battery Life and High automatic recharge and a ±1% 4.1V fl oat voltage. Input Temperature Safety Margin short-circuit protection is included so no blocking diode n Programmable Charge Current Detection/ is required. Termination This 4.1V version of the standard LTC4001 is intended n Automatic Recharge for applications which will be operated or stored above n Thermistor Input for Temperature Qualifi ed approximately 60°C. Under these conditions, the reduced Charging fl oat voltage will trade-off initial cell capacity for the benefi t n Compatible with Current Limited Wall Adapters of increased capacity retention over the life of the battery. A n Low Profi le 16-Lead (4mm × 4mm) QFN Package reduced fl oat voltage also minimizes swelling in prismatic
APPLICATIONS
and polymer cells, and avoids open CID (pressure fuse) in cylindrical cells. n Handheld Battery-Powered Devices Battery charge current, charge timeout and end-of-charge n Handheld Computers indication parameters are set with external components. n Charging Docks and Cradles Additional features include shorted cell detection, tempera- n Digital Cameras ture qualifi ed charging and overvoltage protection. The n Smart Phones LTC4001-1 is available in a low profi le (0.75mm) 16-lead L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other (4mm × 4mm) QFN package. trademarks are the property of their respective owners.
TYPICAL APPLICATION Power Loss vs VBAT 2A Single Cell Li-Ion Battery Charger Charging (PWM Mode)
1.5μH 1.25 SW SENSE 1.00 VINSENSE BATSENS VIN PVIN BAT 4.5V TO 5.5V + 10μF 4.1V 10μF Li-Ion 0.75 PGND TION (W) A TION CIRCUIT POWER LTC4001-1 0.50 CHRG DISSIP NTC AL APPLICA 0.25 FAULT TOT VIN = 5V EN 2A CHARGER PROG IDET TIMER SS GNDSENS 0 3 3.25 3.5 3.75 4 4.25 0.22μF VBAT (V) 40011 TA01b 274Ω 0.1μF 40011 TA01a 40011fa 1
