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參數(shù)資料
| 型號： | RT9209 |
| 英文描述： | Step-down DC/DC Converter |
| 中文描述： | 降壓直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 315K |
| 代理商： | RT9209 |
RT9203/A
Preliminary
www.richtek.com
6
DS9203/A-04 May 2003
Functional Pin Description
BOOT (Pin 1)
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 2)
Connect the UGATE pin to the gate of upper MOSFET.
This pin provides the gate drive for the upper MOSFET.
GND (Pin 3)
Signal and power ground for the IC. All voltage levels
are measured with respect to this pin.
LGATE (Pin 4)
Connect the LGATE pin to the gate of lower MOSFET.
This pin provides the gate drive for the lower MOSFET.
VCC (Pin 5)
This is the main bias supply for the RT9203/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 6)
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 7)
This pin is connected to the output resistor-divider of an
external power transistor or a N-MOSFETbased 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 8)
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.
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