鈻?/div>
Charge Current Programmable up to 1A
Charges Single Cell Li-Ion Batteries Directly from
USB Port
Preset Charge Voltage with 鹵0.35% Accuracy
Thermistor Input for Temperature Quali鏗乪d
Charging
Input Supply Present Logic Output
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating*
Programmable Charge Current Detection/
Termination
Programmable Charge Termination Timer
Smart Pulsing Error Feature
SmartStart
TM
Prolongs Battery Life
20碌A Charger Quiescent Current in Shutdown
Available in a Low Pro鏗乴e (0.75mm) 10-Lead
(3mm
脳
3mm) DFN Package
The LTC
廬
4061 is a full-featured, 鏗俥xible, standalone linear
charger for single-cell Lithium-Ion batteries. It is capable
of operating within USB power speci鏗乧ations.
Both programmable time and programmable current
based termination schemes are available. Furthermore,
the
鈳?/div>
C
鈳?/div>
H
鈳?/div>
R
鈳?/div>
G open-drain status pin can be programmed to
indicate the battery charge state according to the needs
of the application. Additional safety features designed to
maximize battery lifetime and reliability include NTC bat-
tery temperature sensing and the SmartStart
TM
charging
algorithm.
No external sense resistor or external blocking diode is
required for charging due to the internal MOSFET archi-
tecture. Internal thermal feedback regulates the charge
current to maintain a constant die temperature during
high power operation or high ambient temperature condi-
tions. The charge current is programmed with an external
resistor. With power applied, the LTC4061 can be put into
shutdown mode to reduce the supply current to 20碌A and
the battery drain current to less than 2碌A.
Other features include smart recharge, USB
鈳?/div>
C
鈳?/div>
/
鈳?/div>
5 cur-
rent programming input, undervoltage lockout and AC
Present logic.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
SmartStart is a trademark of Linear Technology Corporation.
*Protected by U.S. Patents including 6522118.
APPLICATIO S
鈻?/div>
鈻?/div>
鈻?/div>
Handheld Computers
Portable MP3 Players
Digital Cameras
TYPICAL APPLICATIO
V
IN
4.3V TO 8V
1碌F
V
CC
Complete Charge Cycle (1100mAh Battery)
900
800
CHARGE CURRENT (mA)
700
600
500
400
300
200
100
0
4061 TA01a
800mA Single Cell Li-Ion Battery Charger
(C/10 Termination)
800mA
BAT
LTC4061
EN
CHRG
C/5
TIMER
PROG
I
DET
619鈩?/div>
GND
ACPR
NTC
+
4.2V
SINGLE CELL
Li-Ion BATTERY
BATTERY
VOLTAGE
V
CC
= 5V
T
A
= 25擄C
0
0.5
1.5
1.0
2.0
TIME (HOURS)
2.5
U
4.3
4.2
4.1
BATTERY VOLTAGE (V)
4.0
3.9
BATTERY
CURRENT
3.8
3.7
3.6
3.5
3.4
3.0
4061 TA01b
U
U
4061fa
1
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