LTC3550 Datasheet, PDF (11/24 Pages) Linear Technology – Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter

LTC3550
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.
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.
BLOCK DIAGRA
DCIN
16
BAT
USBIN
15
1
CC/CV
REGULATOR
CC/CV
REGULATOR
HPWR 13
R_HPWR
10mA MAX
PWR 4
+
4.15V
–
DCIN UVLO
+
DC
SOFT-
START
USB
SOFT-
START
USBIN UVLO
3.95V
OSC
FREQ
SHIFT
SLOPE
COMP
I_TH
EA
0.6V
BURST
CLAMP
10mA MAX
CHRG 5
BAT –
LOGIC
RECHRG
TRICKLE
TERM
4.1V
RECHARGE
TRICKLE
CHARGE
BAT
DC_ENABLE
USB_ENABLE
CHARGER CONTROL
2.9V
BAT
5Ω
I_COMP
SQ
RQ
RS LATCH
THERMAL
REGULATION
T_DIE
105°C
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
I_RCMP
EN 12
R_EN
TERMINATION
100mV
I_BAT
/1000
I_BAT
/1000
I_BAT
/1000
6 VFB
7 VCC
10 SW
3
ITERM
R_ITERM
14
IDC
R_IDC
2
IUSB
R_IUSB
11
RUN
8, 9, 17 ^{3550 BD}
GND
3550fa
11