LTC4054LES5-4.2#TRMPBF Linear Technology, LTC4054LES5-4.2#TRMPBF Datasheet - Page 14

• Manufacturer Part Number: LTC4054LES5-4.2#TRMPBF
• Description: IC CHARG BATTERY L-ION TSOT23-5
• Manufacturer: Linear Technology

Specifications of LTC4054LES5-4.2#TRMPBF

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.25 V ~ 6.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5 Thin, TSOT-23-5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LTC4054LES5-4.2#PBF; LTC4054LES5-4.2#PBF; LTC4054LES5-4.2#TRMPBF; LTC4054LES5-4.2#TRMPBFTR

LTC4054-4.2/LTC4054X-4.2
APPLICATIO S I FOR ATIO
USB and Wall Adapter Power
The LTC4054 allows charging from both a wall adapter
and a USB port. Figure 7 shows an example of how to
combine wall adapter and USB power inputs. A P-channel
MOSFET, MP1, is used to prevent back conducting into the
USB port when a wall adapter is present and a Schottky
diode, D1, is used to prevent USB power loss through the
1k pull-down resistor.
Typically a wall adapter can supply more current than the
500mA-limited USB port. Therefore, an N-channel MOSFET,
MN1, and an extra 10k program resistor are used to
increase the charge current to 600mA when the wall
adapter is present.
14
U
U
W
U
USB POWER
500mA I
600mA I
ADAPTER
5V WALL
Figure 7. Combining Wall Adapter and USB Power
CHG
CHG
MP1
1k
D1
4
MN1
LTC4054-4.2
V
CC
10k
PROG
BAT
2k
3
5
I
+
CHG
405442 F07
Li-Ion
BATTERY
SYSTEM
LOAD
405442xf