LTC4081
24
4081fa
For more information www.linear.com/LTC4081
LINEAR TECHNOLOGY CORPORATION 2007
LT 0715 REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC4081
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
Battery Chargers
LTC3550
Dual Input USB/AC Adapter Li-Ion Battery Charger
with Adjustable Output 600mA Buck Converter
Synchronous Buck Converter, Efficiency: 93%, Adjustable Output: 600mA,Charge Current:
950mA Programmable, USB Compatible, Automatic Input Power Detection and Selection
LTC3550-1
Dual Input USB/AC Adapter Li-Ion Battery
Charger with 600mA Buck Converter
Synchronous Buck Converter, Efficiency: 93%, Output: 1.875V at 600mA,
Charge Current: 950mA Programmable, USB Compatible, Automatic Input Power
Detection and Selection
LTC4054-4.2 Standalone Linear Li-Ion Battery Charger with
Integrated Pass Transistor in ThinSOT
TM
Thermal Regulation Prevents Overheating, C/10 Termination
LTC4061 Standalone Li-Ion Charger with Thermistor
Interface
4.2V, ±0.35% Float Voltage, Up to 1A Charge Current, 3mm × 3mm
DFN Package
LTC4061-4.4 Standalone Li-Ion Charger with Thermistor
Interface
4.4V (Max), ±0.4% Float Voltage, Up to 1A Charge Current, 3mm × 3mm
DFN Package
LTC4062
Standalone Linear Li-Ion Battery Charger with
Micropower Comparator
Up to 1A Charge Current, Charges from USB Port, Thermal Regulation
3mm × 3mm DFN Package
LTC4063 Li-Ion Charger with Linear Regulator Up to 1A Charge Current, 100mA, 125mV LDO, 3mm × 3mm DFN Package
LTC4080 Standalone 500mA Charger with 300mA
Synchronous Buck
For 1-Cell Li-Ion/Polymer Batteries; Trickle Charge; Timer Termination +C/10;
Thermal Regulation, Buck Output: 0.8V to V
BAT
, Buck Input: 2.7V to 5.5V, 3mm ×
3mm DFN-10 Package
Power Management
LTC3405/
LTC3405A
300mA (I
OUT
), 1.5MHz, Synchronous Step-
Down DC/DC Converter
95% Efficiency, V
IN
: 2.7V to 6V, V
OUT
= 0.8V, I
Q
= 20µA, I
SD
< 1µA,
ThinSOT Package
LTC3406/
LTC3406A
600mA (I
OUT
), 1.5MHz, Synchronous Step-
Down DC/DC Converter
95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT
= 0.6V, I
Q
= 20µA, I
SD
< 1µA,
ThinSOT Package
LTC3411 1.25A (I
OUT
), 4MHz, Synchronous Step-Down
DC/DC Converter
95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT
= 0.8V, I
Q
= 60µA, I
SD
< 1µA,
MS Package
LTC3440 600mA (I
OUT
), 2MHz, Synchronous Buck-
Boost DC/DC Converter
95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT
= 2.5V, I
Q
= 25µA, I
SD
< 1µA,
MS Package
LTC4411/LTC4412 Low Loss PowerPath
TM
Controller in ThinSOT Automatic Switching Between DC Sources, Load Sharing, Replaces ORing Diodes
LTC4413 Dual Ideal Diode in DFN 2-Channel Ideal Diode ORing, Low Forward On-Resistance, Low Regulated Forward
Voltage, 2.5V ≤ V
IN
≤ 5.5V
Li-Ion Battery Charger with 1.5V Buck Regulator
Buck Efficiency vs Load Current
(V
OUT
= 1.5V)
LOAD CURRENT (mA)
0.01
40
EFFICIENCY (%)
POWER LOSS (mW)
60
80
0.1 10 1001 1000
20
0
100
1
10
100
0.1
0.01
1000
4081 TA02b
V
BAT
= 3.8V
V
OUT
= 1.5V
L = 10μH
C = 4.7μF
EFFICIENCY
(Burst)
POWER LOSS
(Burst)
EFFICIENCY
(PWM)
POWER
LOSS
(PWM)
C
BAT
4.7μF
R
PROG
806Ω
D1
R2
806k
C
OUT
4.7μF
4081 TA02a
C
PL
10pF
R1
715k
R
NOM
100k
R
NTC
100k
V
OUT
(1.5V/300mA)
L1
1OμH
C
IN
4.7μF
500mA
R3
510Ω
LTC4081
NTC
EN_CHRG
MODE
FB
PROG
V
CC
CHRG
BAT
GND
V
CC
(3.75V
TO 5.5V)
+
T
SW
EN_BUCK
4.2V
Li-Ion/
POLYMER
BATTERY
