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SC1652 Arkusz danych(PDF) 4 Page - Semtech Corporation

Numer części SC1652
Szczegółowy opis  MICROPOWER INVERTING DC-DC CONVERTER
PDF  4 Pages
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Producent  SEMTECH [Semtech Corporation]
Strona internetowa  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC1652 Arkusz danych(HTML) 4 Page - Semtech Corporation

  SC1652 Datasheet HTML 1Page - Semtech Corporation SC1652 Datasheet HTML 2Page - Semtech Corporation SC1652 Datasheet HTML 3Page - Semtech Corporation SC1652 Datasheet HTML 4Page - Semtech Corporation  
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© 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
MICROPOWER INVERTING
DC-DC CONVERTER
SC1652
January 29, 1998
PIN CONFIGURATION
PIN DESCRIPTIONS
PIN 1: V
+
2.4V to 7V input supply voltage.
PIN 2: V
REF
1.22V reference output. Bypass with a
0.047µF capacitor to GND. Sourcing
capability is guaranteed to be greater
than 250µA.
PIN 3: SHDN Logic input to shutdown the chip.
>1.5V = normal operation,
GND = shutdown.
In shutdown mode DLOW and DHI
pins are high.
PIN 4: FB
Feedback signal input to comparator.
Connecting a resistance R1 to V
OUT
and a resistance R2 to V
REF yields the
output voltage:
PIN 5: GND
Power ground.
PIN 6: DLOW Driver sinking output. Connected to
DHI when using an external P-channel
MOSFET. When using an external
PNP bipolar transistor, connect a
resistor R
B from this pin to DHI. RB
value depends upon V
+, inductor value
and the PNP bipolar transistor. By
adjusting the R
B value, efficiency can
be optimized.
PIN 7: DHI
Driver sourcing output. Connect to the
gate of the external P-channel
MOSFET or base of the PNP bipolar
transistor.
PIN 8: CL
Current-limit input. This pin clamps the
switch peak current under abnormal
conditions.
REF
OUT
V
R2
R1
-
V
×
=
OUTLINE DRAWING SO-8



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