LTC3554 LINER [Linear Technology], LTC3554 Datasheet - Page 12

• Manufacturer Part Number: LTC3554
• Description: Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators
• Manufacturer: LINER [Linear Technology]

LTC3554
PIN FUNCTIONS
LTC3554 will partition the available power between the
external load on V
Priority is given to the external load and any extra power
is used to charge the battery. An ideal diode from BAT to
V
the allotted input current from V
source is removed. V
impedance multilayer ceramic capacitor.
SUSP (Pin 19): Suspend Mode Logic Input. If this pin
is driven high the input current limit path is disabled.
In this state the circuit draws negligible power from the
V
12
OUT
BUS
ensures that V
pin. Any load at the V
OUT
OUT
OUT
is powered even if the load exceeds
and the internal battery charger.
should be bypassed with a low
OUT
BUS
pin is provided by the
or if the V
BUS
power
battery through the internal ideal diode. When this input
is grounded, the input current limit will be set to desired
value as determined by the state of the HPWR pin. This
pin has a conditional internal pull-down resistor when
power is applied to the V
V
connected to the USB port of a computer or a DC output
wall adapter. V
ance multilayer ceramic capacitor.
Exposed Pad (Pin 21): Ground. The exposed package pad
is ground and must be soldered to the PC board for proper
functionality and for maximum heat transfer.
BUS
(Pin 20): USB Input Voltage. V
BUS
should be bypassed with a low imped-
BUS
pin.
BUS
will usually be
3554f