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LTC4001 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4001
Description  2A Synchronous Buck Li-Ion Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4001 Datasheet(HTML) 1 Page - Linear Technology

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


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