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RT9205 Datasheet(PDF) 6 Page - Richtek Technology Corporation

No. de Pieza. RT9205
Descripción  Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller
Descarga  16 Pages
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Fabricante  RICHTEK [Richtek Technology Corporation]
Página de inicio  http://www.richtek.com
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RT9205 Datasheet(HTML) 6 Page - Richtek Technology Corporation

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RT9205/A
Preliminary
www.richtek.com
DS9205/A-03 May 2003
6
Functional Pin Description
LGATE (Pin 1)
Connect the LGATE pin to the gate of lower MOSFET.
This pin provides the gate drive for the lower MOSFET.
PGND/GND (Pin 2, 3)
Signal and power ground for the IC. All voltage levels
are measured with respect to this pin.
VCC (Pin 4)
This is the main bias supply for the RT9205/A. This pin
also provides the gate bias charge for the gate of lower
MOSFET. The voltage at this pin is monitored for
ensuring a proper power-on reset (POR). This pin is
also the out of an internal 6.0V regulator that powered
from the BOOT pin when the BOOT pin is directly
powered from ATX 12V.
DRV (Pin 5)
This pin is the output of a linear controller. It should be
connected to the base of an external bypass NPN
transistor or the gate of a N-MOSFET to form a linear
low dropout regulator.
FBL (Pin 6)
This pin is connected to the output resistor-divider of
an external power transistor or a N-MOSFET based
low dropout regulator for regulating and monitoring the
output voltage. This pin is also connected to the
protection monitor and the invertering input of error
amplifier of internal linear regulator inside the IC.
FB (Pin 9)
This pin is connected to the PWM converter’s output –
divider for regulating and monitoring the output voltage
of buck converter. This pin also connects to the
protection monitor and the inverting input of internal
PWM error amplifier inside the IC.
BOOT (Pin 13)
This pin provides ground referenced bias voltage to the
upper MOSFET driver. A bootstrap circuit is used to
create a voltage that is suitable for driving a logic-level
N-channel MOSFET when operating at a single 5V
power supply. This pin also could be powered from
ATX 12V, in this situation, an internal 6.0V regulator
will supply to VCC pin for generating bias required
inside the IC.
UGATE (Pin 14)
Connect the UGATE pin to the gate of upper MOSFET.
This pin provides the gate drive for the upper MOSFET.


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