SC1630 Ver la hoja de datos (PDF) - Semtech Corporation
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SC1630 Datasheet PDF : 8 Pages
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January 30, 1998
DEVICE OUTLINE - SO-8
LOW VOLTAGE MULTI-MODE
DC-DC CONVERTER
SC1630
PIN DESCRIPTIONS
PIN 1: SD
The SC1630 goes into shutdown
mode and consumes less than 10µA
when the SD pin is pulled to ground,
and it goes into normal operating
mode when the SD pin is pulled to a
positive voltage above 100mV.
PIN 2: VIN
PIN 3: EXT
Input supply.
Push-Pull driver output to drive exter-
nal power switch.
PIN 4: GND Ground.
PIN 5: FB
Where:
The output voltage can either be inter-
nally set to 5 volts by grounding the FB
pin, or it can be externally set to an
arbitrary voltage by applying to the FB
pin the divider voltage of two external
divider resistors. VOUT voltage is given
by the following equation:
V OUT
= 0 .611
1 +
R1
R2
R1= Resistor connected beween FB
Pin and VOUT pin.
R2= Resistor connected between FB
Pin and ground.
VOUT = Output voltage to be set.
PIN 6: LBO
Open drain output of the battery low
detector, with 45 Ohm “On Resis
tance” at VIN=2V. It is pulled low when
the voltage on LBI pin is below 1.22
volts.
PIN 7: LBI
The inverting input of the battery low
detector, of which the non-inverting in-
put is internally connected to the 1.22V
voltage reference.
PIN 8: VOUT
The output voltage feeds back to the
IC through this pin for internally set 5V
operation. If the output voltage is
externally set, the VOUT pin can be tied
to any low impedance node with volt-
age between the external power
switch threshold and 7 volts.
PIN CONFIGURATION
© 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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