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RT9256GQV Datasheet(PDF) 7 Page - Richtek Technology Corporation

Part # RT9256GQV
Description  Actively Alternative Mode Two-Phase / Dual Switching PWM Controller
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9256GQV Datasheet(HTML) 7 Page - Richtek Technology Corporation

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RT9256
Preliminary
7
DS9256-07 August 2007
www.richtek.com
Functional Pin Description
CSN1 (Pin 1), CSN2 (Pin 8)
Current SenseNegative Input. These pins are negative input
nodes of the current sense amplifiers used for DCR current
sensing. Connect this pin with a resistor to the output
node.
CSP1 (Pin 2), CSP2 (Pin 7)
Current Sense Positive Input. These pins are positive input
nodes of the current sense amplifiers used for DCR current
sensing. Connect this pin to the junction of the filter resistor
and capacitor.
COMP1 (Pin 3), COMP2 (Pin 6)
Compensation Pin. In dual switching mode, these pins
are output nodes of the error amplifiers. In two phase mode,
only COMP1 is active.
FB1 (Pin 4), FB2 (Pin 5)
Feedback Pin. In dual-switching mode, these pins are
negative input pins of the error amplifiers.When SS pass
VCC5
− 1.3 and FB1 or FB2 < 0.6V, the UV protection
function will be activated. The two-phase mode is activated
by pulling FB2 above 4V when POR. The UV protection
function will be enabled if FB1 < 0.6 when the SS pass
VCC5
− 1.3.
RR2 (Pin 9), RR1 (Pin 32)
Ramp resistor. These pins are used to set the ramp
voltages. Connecting a resistor from this pin to its converter
input power sets the ramping slope of the control loop of
the converter. Since it is connected to converter input power,
the ramp slope is input-feed-forwarded. As VIN > 1.8V, RR
pin is enable for ramp setting.
IMAX2 (Pin 10), IMAX1 (Pin 31)
Maximum Current Setting. These pins set the current
limiting levels. Connect these pins with resistors to ground
to set the current limit.
SS2 (Pin 11), SS1 (Pin 30)
Soft-start Pin. These pins provide soft-start function for
their respective controllers. The COMP voltage of the
converter follows the ramping voltage on the SS pin.
RT (Pin 13)
Timing Resistor. Connect a resistor from RT to GND to set
the clock frequency.
EN (Pin 14)
Enable Pin. Pull the EN pin above 0.8V at POR (VCC5 > 4.2V),
the whole chip function will be enabled.
BOOT2 (Pin 15), BOOT1 (Pin 26)
Bootstrap Power Pin. These pins power the high-side
MOSFET drivers. Connect this pin to the junction of the
bootstrap capacitor with the cathode of the bootstrap diode.
Connect the anode of the bootstrap diode to the PVCC
pin.
UGATE2 (Pin 16), UGATE1 (Pin 25)
Upper Gate Drive. These pins drive the gates of the high-
side MOSFETs.
LGATE2 (Pin 19), LGATE1 (Pin 22)
Lower Gate Drive. These pins drive the gates of the low-
side MOSFETs.
PHASE2 (Pin 17), PHASE1 (Pin 24)
These pins are return nodes of the high-side drivers.
Connect these pins to high-side MOSFET sources together
with the low-side MOSFET drains and the inductor.
GND (Pin 12)
Chip Ground.
PGND (Pin 18 and 23)
DriverGround.
PVCC (Pin 20 and 21)
Driver Power.
VCC5 (Pin 28), VCC (Pin 29)
The VCC5 pin is the internal 5.2V regulator output powered
from the external voltage (VCC). VCC5 is dedicated for
RT9256 internal use only and not for external power source.


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