AIC1633
ꢀ PIN DESCRIPTIONS
AIC1633-30/ AIC1633-33 / AIC1633-50
PIN 1: ILIM/SD- 1. Connected to VIN pin through
a resistor to set the switch
AIC1633A
PIN 1:
ILIM/SD- 1. Connected to VIN pin through
a resistor to set the switch
peak current. It serves to
protect IC and inductor, as
well as to improve efficiency
and output ripples. However,
the current limit resistor limits
supply capability of the
peak current. It serves to
protect IC and inductor, as
well as to improve efficiency
and output ripples. However,
the current limit resistor limits
supply capability of the
AIC1633A.
(See
typical
AIC1633.
(See
typical
performance characteristics).
The ILIM/SD pin should be
shorted to VIN pin if limiting
on switch peak current is not
intended.
performance characteristics).
The ILIM/SD pin should be
shorted to VIN pin if limiting
on switch peak current is not
intended.
2. The AIC1633A goes in
2. The
AIC1633
goes
in
shutdown
mode
and
shutdown
mode
and
consumes less than 10µA
when ILIM/SD pin is pulled to
ground.
consumes less than 10µA
when ILIM/SD pin is pulled to
ground.
PIN 2: VIN - Input supply.
PIN 3: SW - Drain of the power switch, to be
connected to inductor/ diode.
PIN 4: GND - Ground.
PIN 5: FB
PIN 2: VIN
PIN 3: SW
-
-
Input supply.
Drain of the power switch, to be
connected to inductor/ diode.
PIN 4:SGND - Ground connected to source of
power switch.
PIN 5:CGND - Ground for control circuits of the
IC. It should be separated from
SGND to avoid the interference.
- Output voltage can either be
internally set to
5
volt by
grounding FB pin, or be externally
set to an arbitrary voltage by
applying to FB pin the divider
voltage of two divider resistors.
PIN 6:LBO
-
Open drain output of the battery
low detector, with 45Ω “ON
resistance” at VIN=2V. It is pulled
low when the voltage on LBI pin
is below 1.22V.
VOUT voltage is given by the
following equation:
PIN 7:LBI
-
The noninverting input of the
battery low detector, of which the
inverting input is internally
connects to 1.22V voltage
reference.
R1 VOUT
R2 0.617
=
−1
where R1 = Resistor connected
between FB pin and VOUT pin.
R2 = Resistor connected between
FB pin and ground.
PIN 8:VOUT - The output voltage feedbacks to
the IC through this pin.
VOUT=Output voltage to be set.
PIN 6: LBO - Open drain output of the battery
low detector, with 45Ω “ON
resistance” at VIN=2V. It is pulled
low when the voltage on LBI pin is
below 1.22V.
6
AIC [ ANALOG INTERGRATIONS CORPORATION ]
