LTC3550-1_15 Datasheet, PDF (11/24 Pages) Linear Technology – Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter

LTC3550-1
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
1mA MAX
USBPWR 13
10mA MAX
PWR 4
10mA MAX
CHRG 5
+
4.15V
–
DCIN UVLO
+
BAT _–
DC
SOFT-
START
USB
SOFT-
START
USBIN UVLO
3.95V
BAT
ENABLE 12
RECHRG
LOGIC
TERM
R_ENABLE
4.1V
RECHARGE
BAT
DC_ENABLE USB_ENABLE
CHARGER CONTROL
SQ
RQ
RS LATCH
THERMAL
REGULATION
T_DIE
105°C
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
TERMINATION
100mV
I_BAT
/1000
I_BAT
/1000
I_BAT
/1000
OSC
SLOPE
COMP
I_TH
EA
BURST
CLAMP
I_COMP
ANTI-
SHOOT-
THRU
I_RCMP
FREQ
SHIFT
6 VOUT
R1
0.6V
R2
7 VCC
5Ω
10 SW
3
ITERM
R_ITERM
14
IDC
R_IDC
2
IUSB
R_IUSB
11
RUN
8, 9, 17
GND
35501f
11