Document
LTC4065L/LTC4065LX/ LTC4065L-4.1/LTC4065LX-4.1
Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN
FEATURES
nn Charge Current Programmable up to 250mA with 5% Accuracy
nn Complete Linear Charger in 2mm × 2mm DFN Package nn C/10 Charge Current Detection Output nn Timer Termination nn No External MOSFET, Sense Resistor or Blocking
Diode Required nn Preset Float Voltage with 0.6% Accuracy:
4.2V for LTC4065L/LTC4065LX 4.1V for LTC4065L-4.1/LTC4065LX-4.1 nn Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating nn Charge Current Monitor Output for Gas Gauging nn Automatic Recharge nn Charges Single Cell Li-Ion Batteries Directly from USB Port nn 20µA Supply Current in Shutdown Mode nn Available Without Trickle Charge (LTC4065LX/ LTC4065LX-4.1) nn Tiny 6-Lead (2mm × 2mm) DFN Package
APPLICATIONS
nn Charger for Li-Ion Coin Cell Batteries nn Portable MP3 Players, Wireless Headsets nn Bluetooth Applications nn Multifunction Wristwatches
All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364.
DESCRIPTION
The LTC®4065L is a complete constant-current/constantvoltage linear charger for single-cell lithium-ion batteries. Its small size and ability to accurately regulate low charge currents make the LTC4065L especially well-suited for portable applications using low capacity rechargeable lithium-ion cells. Furthermore, LTC4065L is specifically designed to work within USB power specifications.
The CHRG pin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal timer terminates charging according to battery manufacturer specifications.
The LTC4065L-4.1/LTC4065LX-4.1 features a constantvoltage float voltage of 4.1V. This 4.1V version of the standard LTC4065L/LTC4065LX is intended for back-up or high ambient temperature applications. Under these conditions, a reduced float voltage will trade-off initial cell capacity for the benefit of increased capacity retention over the life of the battery. A reduced float voltage also minimizes swelling in prismatic and polymer cells.
When the input supply (wall adapter or USB supply) is removed, the LTC4065L automatically enters a low current state, dropping battery drain current to less than 1µA. With power applied, LTC4065L can be put into shutdown mode, reducing the supply current to less than 20µA.
The full-featured LTC4065L also includes automatic recharge, low-battery charge conditioning (trickle charging) and soft-start (to limit inrush current).
TYPICAL APPLICATION
Standalone Li-Ion Battery Charger
VIN 4.3V TO 5.5V
C1 1µF
R1 510Ω
VCC BAT LTC4065L
CHRG PROG EN GND
100mA
+ 4.2V
Li-Ion
R3
BATTERY
2k
4065L TA01
CHARGE CURRENT (mA)
Complete Charge Cycle (180mAh Battery) LTC4065L and LTC4065LX
110
100
4.3
90 CONSTANT 80 CURRENT
70
CONSTANT VOLTAGE
4.1
60
CHRG
3.9
50
TRANSITION
40
3.7
30
20 10
0 0
CHARGE
TERMINATION
3.5
VCC = 5V
RPROG = 2k
3.3
0.5 1 1.5 2 2.5 3 3.5 4 4.5
TIME (HOURS)
4065 TA02
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BATTERY VOLTAGE (V)
Rev. D
1
LTC4065L/LTC4065LX/ LTC4065L-4.1/LTC4065LX-4.1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VCC t < 1ms and Duty Cycle < 1%...................– 0.3V to 7V Steady State.............................................. –0.3V to 6V
BAT, CHRG.................................................... –0.3V to 6V EN, PROG..........................................–0.3V to VCC + 0.3V BAT Short-Circuit Duration.............................Continuous BAT Pin Current....................................................275mA PROG Pin Current..............................................1.342mA Junction Temperature (Note 6).............................. 125°C Operating Temperature Range (Note 2)....– 40°C to 85°C Storage Temperature Range.................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
GND 1
CHRG 2
7
BAT 3
6 PROG 5 EN 4 VCC
DC PACKAGE 6-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 60°C/W (NOTE 3) EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4065LEDC#PBF
LTC4065LEDC#TRPBF
LCBD
6-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC4065LXEDC#PBF LTC4065LXEDC#TRPBF LCKS
6-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC4065LEDC-4.1#PBF LTC4065LEDC-4.1#TRPBF LGGN
6-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC4065LXEDC-4.1#PBF LTC4065LXEDC-4.1#TRPBF LHBJ
6-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
LTC4065 Options PART NUMBER LTC4065 LT.