LTC3550-1 Linear Technology, LTC3550-1 Datasheet - Page 22

• Manufacturer Part Number: LTC3550-1
• Description: Dual Input USB/AC Adapter Li-Ion Battery Charger
• Manufacturer: Linear Technology

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APPLICATIO S I FOR ATIO
LTC3550-1
TYPICAL APPLICATIO S
22
U
ADAPTER
POWER
WALL
USB
U
* MURATA LQH32CN2R2M33
** TAIYO YUDEN JMK316BJ106ML
ADAPTER
†
POWER
TAIYO YUDEN LMK212BJ475MG
2.1k
1%
WALL
USB
Full Featured Dual Input Charger Plus Step-Down Converter
1µF
1µF
U
W
Figure 7b. Buck Regulator Effi ciency vs Output Current
1.24k
1%
1µF
100
1µF
90
80
70
60
50
0.1
Figure 7a. Design Example Circuit
1k
1%
2.1k
1%
U
1.24k
1%
DCIN
USBIN
IUSB
IDC
ITERM
V
LTC3550-1
CC
RUN
DCIN
USBIN
IUSB
IDC
1
LTC3550-1
GND
= 3.6V
GND
I
CHRG
LOAD
ITERM
PWR
V
BAT
V
V
OUT
SW
BAT
OUT
V
CC
SW
10
CC
(mA)
V
V
CC
1k
CC
2.2µH*
1.24k
1%
= 4.2V
= 2.7V
100
2.2µH
1k
800mA (WALL)
475mA (USB)
4.7µF
35501 F07b
1000
†
+
3550-1 F07a
4.2V
SINGLE-
CELL Li-Ion
BATTERY
10µF
CER
800mA (WALL)
475mA (USB)
10µF**
CER
V
1.875V
600mA
4.7µF
OUT
V
1.875V
600mA
OUT
+
4.2V
SINGLE-CELL
Li-Ion BATTERY
3550-1 TA03
35501f