LTC3553 Linear Technology Corporation, LTC3553 Datasheet - Page 13

• Manufacturer Part Number: LTC3553
• Description: Micropower USB Power Manager
• Manufacturer: Linear Technology Corporation

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PIN FUNCTIONS
BAT (Pin 17): Single-Cell Li-Ion Battery Pin. Depending
on available power and load, a Li-Ion battery on BAT will
either deliver system power to V
diode or be charged from the battery charger.
V
and Input Voltage of the Battery Charger. The majority of
the portable products should be powered from V
LTC3553 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.
OUT
OUT
ensures that V
(Pin 18): Output Voltage of the PowerPath Controller
OUT
OUT
OUT
is powered even if the load exceeds
and the internal battery charger.
should be bypassed with a low
BUS
OUT
or if the V
through the ideal
BUS
OUT
power
. The
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
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
BUS
(Pin 20): USB Input Voltage. V
pin. Any load at the V
BUS
should be bypassed with a low imped-
BUS
OUT
pin.
pin is provided by the
BUS
LTC3553
will usually be
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