LTC4410ES6#TRMPBF Linear Technology, LTC4410ES6#TRMPBF Datasheet - Page 6

• Manufacturer Part Number: LTC4410ES6#TRMPBF
• Description: IC POWER MANAGER USB TSOT23-6
• Manufacturer: Linear Technology

Specifications of LTC4410ES6#TRMPBF

• Function: Power Management
• Voltage - Supply: 4.35 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6 Thin, TSOT-23-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIO S I FOR ATIO
LTC4410
USB Power Management and Wall Adapter Power
With the addition of a few components, the LTC4410
allows for simultaneous device operation and battery
charging while connected to USB port or wall adapter. The
LTC4410 will proportionally reduce the battery charge
current to keep the total current within the current rated for
the wall adapter. Figure 1 shows an example of how to
combine the USB power and wall adapter inputs. A
P-channel MOSFET, MP1, is used to prevent back con-
ducting into the USB port when a wall adapter is present.
The pull-down resistor, R1, is to assure that MP1 is on
6
5V WALL ADAPTER
4.35V TO 5.25V
FROM USB
U
750mA
U
R1
1k
MP1
Figure 1. USB Power Management and Wall Adapter Power
D1
W
100mA 500mA
0.1µF
OFF ON
1Ω
4.7µF
U
MODE
V
SHDN
V
TIMER
MN1
R3
4.87k
1%
IN
IN
GND
R2
3.4k
1%
LTC4053
LTC4410
PROG
CHP
when there is no wall adapter. The Schottky diode, D1, is
used to prevent USB power loss through R1. If the wall
adapter used has more than 500mA capability, a resistor,
R3, connected in parallel with R2 using N-channel MOSFET
MN1 will increase the charge current when the wall adapter
is present. In this example the battery charge current is
340mA without the wall adapter (see the LTC4053 data
sheet for details on how to program the battery charge
current). When the wall adapter is present, the charge
current is 750mA.
USBP
GND
V
BAT
NTC
OUT
1M
4.7µF
MP2
4410 F01
I
1-CELL
Li-Ion
LOAD
POWER SUPPLY
SYSTEM
sn4410 4410fs