rt9210 Richtek Technology Corporation, rt9210 Datasheet - Page 4

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

RT9210
NC (Pin 10 , 16 , 18)
No internal connection.
SENSE2 (Pin 17)
This pin is connected directly to the regulated output of
V
the V
regulator that is enable in V2_SD mode.
PGOOD (Pin 19)
PGOOD is an open-drain output used to indicate that both
the V
voltage ranges.
V2_SD (Pin 20)
A TTL compatible high level at this pin puts the V
controller into“sleep”mode. In sleep mode, both UGATE2
and LGATE2 are driven low, effectively floating the V
supply. While the V
50% of V
drivers V
can overcome up to at least ±10mA of leakage on V
While V2_SD is high, PGOOD is low.
OCSET/SD (Pin 21)
Connect a resistor (R
the upper MOSFET of the V
current trip point. R
, and the upper MOSFET on-resistance, R
V
to the following equation:
An over-current trip cycles the soft-start function. Pulling
the pin to ground resets the device and all external
MOSFETs are turned off allowing the two output voltage
power rails to float.
PVCC1 (Pin 22)
Connect this pin to a well-decoupled 5V supply. It is also
the positive supply for the lower gate driver, LGATE1.
www.richtek.com
4
TT
DDQ
supply. This pin is also used as the feedback pin of
TT
DDQ
converter over-current trip point (I
regulator and as the regulation point for the window
I
OCSET
TT
and V
DDQ
via the SENSE2 pin. The window regulator
via a low current window regulator which
=
TT
R
regulators are within normal operating
DS(ON)
OCSET
TT
OCSET
supply “floats”, it is held to about
, an internal 40μA current source
40uA
of
the
) from this pin to the drain of
DDQ
×
upper
R
regulator sets the over-
OCSET
MOSFET
OCSET
DS(ON)
) according
, set the
Preliminary
TT
TT
TT
.
LGATE1 (Pin 23)
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.
PGND1 (Pin 24)
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.
DDQ
lower gate drive output. Connect to gate of the low-
DS9210-05 March 2007