LTC4065/LTC4065A
Standalone 750mA Li-Ion
Battery Charger in 2 2 DFN
FEATURES DESCRIPTIO
Complete Linear Charger in 2mm 2mm DFN The LTC 4065 is a complete constant-current/constant-
Package voltage linear charger for single-cell lithium-ion batteries.
C/10 Charge Current Detection Output Its 2mm 2mm DFN package and low external component
Timer Termination
count make the LTC4065 especially well-suited for por-
Charge Current Programmable up to 750mA with
table applications. Furthermore, LTC4065 is specifically
5% Accuracy
designed to work within USB power specifications.
No External MOSFET, Sense Resistor or Blocking
The CHRG pin indicates when charge current has dropped
Diode Required
to ten percent of its programmed value (C/10). An internal
Preset 4.2V Float Voltage with 0.6% Accuracy
timer terminates charging according to battery manufac-
Constant-Current/Constant-Voltage Operation with
turer specifications.
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating No external sense resistor or blocking diode is required
ACPR Pin Indicates Presence of Input Supply due to the internal MOSFET architecture. Thermal feed-
(LTC4065A Only)
back regulates charge current to limit the die temperature
Charge Current Monitor Output for Gas Gauging
during high power operation or high ambient temperature
Automatic Recharge
conditions.
Charges Single Cell Li-Ion Batteries Directly from
When the input supply (wall adapter or USB supply) is
USB Port
removed, the LTC4065 automatically enters a low current
20A Supply Current in Shutdown Mode
state, dropping battery drain current to less than 1A. With
Soft-Start Limits Inrush Current
power applied, LTC4065 can be put into shutdown mode,
Tiny 6-Lead (2mm 2mm) DFN Package
reducing the supply current to less than 20A.
U
APPLICATIO S
The full-featured LTC4065 also includes automatic re-
charge, low-battery charge conditioning (trickle charg-
Wireless PDAs
ing), soft-start (to limit inrush current) and an open-drain
Cellular Phones
status pin to indicate the presence of an adequate input
Portable Electronics
voltage (LTC4065A only).
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
The LTC4065 is available in a tiny 6-lead, low profile
(0.75mm) 2mm 2mm DFN package.
TYPICAL APPLICATIO
Standalone Li-Ion Battery Charger
500mA
V
IN
V BAT
CC
4.3V TO 5.5V
R1
LTC4065
510
C1 CHRG PROG 4.2V
+
1F Li-Ion
EN GND
BATTERY
R3
R2*
2k
1
4065 TA01
*SERIES 1 RESISTOR ONLY NEEDED FOR INDUCTIVE INPUT SUPPLIES
4065fb
1
U
ULTC4065/LTC4065A
UUW
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
TOP VIEW
V
CC
t < 1ms and Duty Cycle < 1% ................. 0.3V to 7V
GND 1 6 PROG
Steady State ........................................... 0.3V to 6V
CHRG 2 7 5 EN/ACPR*
BAT, CHRG ................................................. 0.3V to 6V
BAT 3 4 V
CC
EN (LTC4065), ACPR (LTC4065A).. 0.3V to V + 0.3V
CC
PROG.............................................. 0.3V to V + 0.3V
CC
DC PACKAGE
BAT Short-Circuit Duration ...........................Continuous 6-LEAD (2mm 2mm) PLASTIC DFN
T = 125C, = 60C/W (NOTE 3)
JMAX JA
BAT Pin Current ................................................. 800mA
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
PROG Pin Current ............................................... 800A
*EN PIN 5 ON LTC4065EDC, ACPR PIN 5 ON LTC4065AEDC
Junction Temperature (Note 6)............................ 125C
ORDER PART NUMBER DC PART MARKING
Operating Temperature Range (Note 2) .. 40C to 85C
LTC4065EDC LBPG
Storage Temperature Range ................ 65C to 125C
LTC4065AEDC LBVJ
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: