rt9210 Richtek Technology Corporation, rt9210 Datasheet - Page 3

• Manufacturer Part Number: rt9210
• Description: Dual Synchronous Buck Dc-dc Controller Memory Vddq Termination
• Manufacturer: Richtek Technology Corporation

Functional Pin Description
UGATE1 (Pin 1)
V
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 V
VREF (Pin 4)
Buffered internal reference voltage of V
should be used to provide the reference voltage for the
Northbridge chipset and DDR memory.
FB1 (Pin 5)
V
the error amplifier. FB1 senses the V
external resistor divider network.
COMP1 (Pin 6)
V
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
V
the voltage at V
DS9210-05 March 2007
DDQ
DDQ
DDQ
DDQ
DDQ
upper gate driver output. Connect to gate of the high-
external compensation. This pin internally connects
feedback voltage. This pin is the inverting input of
supply. This pin is also used as an input to create
regulator for over-current protection.
REF.
DDQ
DDQ
/ 2. This output
through an
Preliminary
VREF_IN (Pin 8)
This pin is used as an option to overdrive the internal
resistor divider network that sets the voltage for both V
and the reference voltage for the V
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)
V
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)
V
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.
TT
TT
upper gate driver output. Connect to gate of the high-
lower gate driver output. Connect to gate of the low-
TT
RT9210
supply. A 100pF
www.richtek.com
REF
3