LTC3550 Linear Technology, LTC3550 Datasheet - Page 11

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

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PI FU CTIO S
DCIN (Pin 16): Wall Adapter Input Supply Pin. Provides
power to the battery charger. The maximum supply
current is 950mA. This should be bypassed with a 1µF
capacitor.
HPWR
BLOCK DIAGRA
CHRG
PWR
EN
U
13
12
4
5
10mA MAX
10mA MAX
R
HPWR
U
R
LOGIC
RECHRG
TRICKLE
EN
TERM
DCIN
16
4.15V
BAT
U
TERMINATION
RECHARGE
+
–
+
–
TRICKLE
CHARGE
W
DCIN UVLO
+
–
–
+
+
–
100mV
4.1V
2.9V
REGULATOR
BAT
CC/CV
DC_ENABLE
3
R
START
SOFT-
ITERM
ITERM
I
/1000
DC
BAT
CHARGER CONTROL
BAT
15
14
START
USB_ENABLE
SOFT-
USB
R
IDC
I
/1000
IDC
BAT
REGULATOR
CC/CV
2
R
I
/1000
IUSB
IUSB
BAT
USBIN UVLO
Exposed Pad (Pin 17): GND. The exposed backside of the
package is ground and must be soldered to the PCB ground
for electrical connection and maximum heat transfer.
+
–
+
–
REGULATION
THERMAL
3.95V
BAT
USBIN
+
–
RS LATCH
1
S
R
Q
Q
T
105°C
DIE
SWITCHING
BLANKING
CIRCUIT
LOGIC
AND
11
RUN
–
I
SHOOT-
COMP
ANTI-
THRU
SLOPE
COMP
I
RCMP
BURST
CLAMP
+
+
–
I
TH
OSC
LTC3550
EA
–
+
SHIFT
FREQ
5Ω
8, 9, 17
GND
0.6V
11
3550 BD
3550fa
10
6
7
V
V
SW
FB
CC