LTC4063 Datasheet, PDF (1/20 Pages) Linear Technology – Standalone Linear Li-Ion Charger with Micropower Low Dropout Linear Regulator

LTC4063
Standalone Linear Li-Ion
Charger with Micropower
Low Dropout Linear Regulator
FEATURES
■ _{Charge Current Programmable up to 1A}
■ _{Integrated 100mA Adjustable Low Dropout Linear}
Regulator
■ _{Charges Single Cell Li-Ion Batteries Directly from}
USB Port
■ _{Preset Charge Voltage with ±0.35% Accuracy}
■ _{No External MOSFET, Sense Resistor or Blocking}
Diode Needed
■ _{Thermal Regulation Maximizes Charge Rate}
Without Risk of Overheating*
■ _{Adjustable LDO Output Voltage Range:}
1.2V to 4.2V
■ _{Programmable Charge Termination Timer}
■ _{Programmable Charge Current Detection/Termination}
■ _SmartStart^TM _{Prolongs Battery Life}
■ _{Charge Status Output}
■ _{35µA Charger Quiescent Current in Shutdown}
■ _{15µA LDO Quiescent Current}
■ _{Available in a Low Profile (0.75mm) 10-Lead}
(3mm × 3mm) DFN Package
U
APPLICATIO S
■ _{Handheld Computers}
■ _{Portable MP3 Players}
■ _{Digital Cameras}
DESCRIPTIO
The LTC^®4063 is a standalone linear charger for single cell
lithium-ion batteries with an adjustable low dropout linear
regulator (LDO). The adjustable LDO regulates an output
voltage between 1.2V to 4.2V at up to 100mA load current.
When the input supply (wall adapter or USB supply) is
removed, the LDO regulates the output voltage without
interruption. The battery charger and LDO regulator can be
enabled individually.
No external sense resistor or external blocking diode is
required for charging due to the internal MOSFET architec-
ture. Internal thermal feedback regulates the charge cur-
rent to maintain a constant die temperature during high
power operation or high ambient temperature conditions.
The float voltage is fixed at 4.2V and the charge current is
programmed with an external resistor. Charge termination
methods include minimum charge current or maximum
time. With power applied, the LTC4063 can be put into
shutdown mode to reduce the supply current to 35µA and
the battery drain current to less than 2µA.
Other features include smart recharge, undervoltage lock-
out, LDO current limiting and a charge status pin to
indicate when the charge cycle has completed.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
SmartStart is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents including 6522118.
TYPICAL APPLICATIO
Single Cell Li-Ion Battery Charger with Regulated 3V Output
(C/10 Termination)
V_IN
4.3V TO 8V
1µF
715Ω
V_CC
BAT
LTC4063
OUT
TIMER
PROG
FB
IDET
GND
700mA
V_OUT
3V
440k
+ ^4.2V
SINGLE CELL
2.2µF
Li-Ion BATTERY
160k
4063 TA01a
Complete Charge Cycle (900mAh Battery)
800
CONSTANT CURRENT
700
600
4.75
CONSTANT
4.50
VOLTAGE
4.25
500
4.00
400
3.75
300
3.50
200
3.25
100 V_CC = 5V
3.00
T_A = 25°C
0
2.75
0 0.25 0.50 0.75 1 1.25 1.50 1.75 2 2.25
TIME (HOURS)
4063 TA01b
4063fb
1