LT3048 Series
8
3048fa
For more information www.linear.com/LT3048
PIN FUNCTIONS
LT3048
SW (Pin 1): Boost Regulator Switch Node. This is the
collector of the internal power transistor and the anode
of the internal Schottky diode.
V
IN
(Pin 2): Input Supply. Provides operating current to
the boost regulator. Bypass to ground.
GND (Pin 3): Ground. This pin must be soldered to PCB
ground. The exposed pad must also be soldered to PCB
ground.
BYP (Pin 4): Bypass. Add an optional capacitor from
LDOOUT to BYP to reduce noise at LDOOUT; otherwise
leave BYP unconnected. A capacitor also soft-starts the
linear regulator.
FB (Pin 5): The LT3048 regulates the FB pin to 1.25V.
Connect the feedback resistor divider tap to this pin.
LDOOUT (Pin 6): LDO Linear Regulator Output. This pin
is programmed by the feedback resistor divider. Bypass
to ground with a minimum of 1μF.
EN (Pin 7): Enable. Logic input to enable the boost and
linear regulator.
BSTOUT (Pin 8): Boost Regulator Output. This pin is con-
nected to the internal Schottky diode and is regulated to
1.1V above LDOOUT. Bypass to ground.
GND (Exposed Pad Pin 9): The internal boost power switch
is connected to the exposed pad. Tie to ground.
LT3048-XX
SW (Pin 1): Boost Regulator Switch
Node. This is the
collector of the internal power transistor and the anode
of the internal Schottky diode.
V
IN
(Pin 2): Input Supply. Provides operating current to
the boost regulator. Bypass to ground.
GND (Pin 3): Ground. This pin must be soldered to PCB
ground. The exposed pad must also be soldered to PCB
ground.
BYP (Pin 4): Bypass. Add an optional capacitor from
LDOOUT to BYP to reduce noise at LDOOUT; otherwise
leave BYP unconnected. A capacitor also soft-starts the
linear regulator.
LDOOUT (Pin 5): LDO Linear Regulator Output. This pin
is regulated to a fixed voltage. Bypass to ground with a
minimum of 1μF.
LDOIN (Pin 6): LDO Linear Regulator Input. Normally
connected to BSTOUT. Bypass to ground.
EN (Pin 7): Enable. Logic input to enable the boost and
linear regulator.
BSTOUT (Pin 8): Boost Regulator Output. This pin is con-
nected to the internal Schottky diode and is regulated to
1.1V above LDOOUT. Bypass to ground.
GND (Exposed Pad Pin 9): The internal boost power switch
is connected to the exposed pad. Tie to ground.