RT8294GSP Ver la hoja de datos (PDF) - Richtek Technology
Número de pieza
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Fabricante
RT8294GSP Datasheet PDF : 15 Pages
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RT8294
Functional Pin Description
Pin No.
SOP-8
SOP-8
(Exposed Pad)
Pin Name
1
1
BOOT
2
2
VIN
3
3
SW
4
4,
9 (Exposed Pad)
GND
5
5
FB
6
6
COMP
7
7
EN
8
8
SS
Pin Function
Bootstrap for High Side Gate Driver. Connect a 10nF or greater
ceramic capacitor from BOOT to SW pins.
Input Supply Voltage, 4.5V to 23V. Must bypass with a suitably large
ceramic capacitor.
Phase Node. Connect this pin to external L-C filter.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Feedback Input Pin. This pin is connected to the converter output. It
is used to set the output of the converter to regulate to the desired
value via an internal resistive voltage divider. For an adjustable
output, an external resistive voltage divider is connected to this pin.
Compensation Node. COMP is used to compensate the regulation
control loop. Connect a series RC network from COMP to GND. In
some cases, an additional capacitor from COMP to GND is required.
Enable Input pin. A logic high enables the converter; a logic low
forces the RT8294 into shutdown mode reducing the supply current
to less than 3µA. Attach this pin to VIN with a 100kΩ pull up resistor
for automatic startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a
capacitor from SS to GND to set the soft-start period. A 0.1µF
capacitor sets the soft-start period to 15.5ms .
Function Block Diagram
VIN
Internal
Regulator
Oscillator
Shutdown
Comparator VA VCC
1.2V +
Foldback
Control
-
0.5V +
Lockout
5k
Comparator
EN
-
-
UV
Comparator
2.7V +
3V
VCC
6µA
SS
+
0.923V +
-
Error Amp
Current Sense
Slope Comp Amplifier
+
VA
-
SQ
+
-
RQ
Current
Comparator
130mΩ
130mΩ
BOOT
SW
GND
FB
COMP
DS8294-02 March 2011
www.richtek.com
3
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