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RT9210 数据表(PDF) 3 Page - Richtek Technology Corporation

部件名 RT9210
功能描述  Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination
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制造商  RICHTEK [Richtek Technology Corporation]
网页  http://www.richtek.com
标志 RICHTEK - Richtek Technology Corporation

RT9210 数据表(HTML) 3 Page - Richtek Technology Corporation

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RT9210
Preliminary
DS9210-05 March 2007
3
www.richtek.com
Functional Pin Description
UGATE1 (Pin 1)
VDDQ upper gate driver output. Connect to gate of the high-
side power N-MOSFET. This pin is monitored by the
adaptive shoot-through protection circuitry to determine
when the upper MOSFET has turned off.
BOOT1 (Pin 2)
Bootstrap supply pin for the upper gate driver. Connect
the bootstrap capacitor between BOOT1 pin and the
PHASE1 pin. The bootstrap capacitor provides the charge
to turn on the upper MOSFET.
PHASE1 (Pin 3)
Connect this pin to the source of the upper MOSFET and
the drain of the lower MOSFET. PHASE1 is used to
monitor the voltage drop across the upper MOSFET of
the VDDQ regulator for over-current protection.
VREF (Pin 4)
Buffered internal reference voltage of VDDQ / 2. This output
should be used to provide the reference voltage for the
Northbridge chipset and DDR memory.
FB1 (Pin 5)
VDDQ feedback voltage. This pin is the inverting input of
the error amplifier. FB1 senses the VDDQ through an
external resistor divider network.
COMP1 (Pin 6)
VDDQ external compensation. This pin internally connects
to the output of the error amplifier and input of the PWM
comparator. Use a RC + C network at this pin to
compensate the feedback loop to provide optimum
transient response.
SENSE1 (Pin 7)
This pin is connected directly to the regulated output of
VDDQ supply. This pin is also used as an input to create
the voltage at VREF.
VREF_IN (Pin 8)
This pin is used as an option to overdrive the internal
resistor divider network that sets the voltage for both VREF
and the reference voltage for the VTT supply. A 100pF
capacitor between VREF_IN and ground is recommended
for proper operation.
GNDA (Pin 9)
Signal ground for the IC. All voltage levels are measured
with respect to this pin. Ties the pin directly to ground
plane with the lowest impedance.
BOOT2 (Pin 11)
Bootstrap supply pin for the upper gate driver. Connect
the bootstrap capacitor between BOOT2 pin and the
PHASE2 pin. The bootstrap capacitor provides the charge
to turn on the upper MOSFET.
UGATE2 (Pin 12)
VTT upper gate driver output. Connect to gate of the high-
side power N-MOSFET. This pin is monitored by the
adaptive shoot-through protection circuitry to determine
when the upper MOSFET has turned off.
PGND2 (Pin 13)
Return pin for high currents flowing in low-side power
N-MOSFET. Ties the pin directly to the low-side MOSFET
source and ground plane with the lowest impedance.
LGATE2 (Pin 14)
VTT lower gate driver output. Connect to gate of the low-
side power N-MOSFET. This pin is monitored by the
adaptive shoot-through protection circuitry to determine
when the lower MOSFET has turned off.
VCC (Pin 15)
Connect this pin to a well-decoupled 5V bias supply. It is
also the positive supply for the lower gate driver, LGATE2.


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