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PDF RT9227A Data sheet ( Hoja de datos )
| Número de pieza | RT9227A | |
| Descripción | Advanced PWM and Dual Fixed Linear Power Controller | |
| Fabricantes | ETC | |
| Logotipo |  |
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Preliminary
RT9227A
Advanced PWM and Dual Fixed Linear Power Controller
General Description
The RT9227A is a 3-in-one power controller optimized
for high-performance microprocessor and computer
applications. The IC integrates a synchronous buck PWM
controller, a linear regulator and a linear controller as well
as monitoring and protection functions into a 24-pin SOP
package. The PWM controller regulates the
microprocessor core voltage. The linear regulator
provides power for the clock driver circuit and the linear
controller regulates power for the GTL bus.
The RT9227A features an Intel-compatible, TTL 5-bit
programmable DAC that adjusts the core voltage from
2.1V to 3.5V in 0.1V increments and from 1.3V to 2.05V
in 0.05V steps. The 5-bit DAC has a typical ±1% tolerance.
The linear regulator uses an internal drive device to
provide a fixed 2.5V ±2.5% output voltage. The linear
controller drives an external N-Channel MOSFET or a low
cost NPN bipolar transistor to provide a fixed 1.5V ±2.5%.
The RT9227A monitors all the output voltages. A Power-
good signal is issued when the core voltage is within ±10%
of the DAC setting and the other levels are above their
under-voltage levels. Additional build-in over-voltage
protection for the core output uses the lower MOSFET to
prevent output voltage above 115% of the DAC setting.
The PWM over-current function monitors the output
current using the voltage drop across the upper
MOSFET's RDS(ON), which eliminates the need for a current
sensing resistor.
Ordering Information
RT9227A
Package Type
S : SOP-24
Note :
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
RichTek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
`Suitable for use in SnPb or Pb-free soldering processes.
`100%matte tin (Sn) plating.
DS9227A-05 March 2007
Features
z 3-in-one Regulated Voltages for Microprocessor
Core, Clock, and GTL
z Compatible with HIP6016
z Power-good Output Voltage Monitor
Switching section
z 5-bit DAC Programmable from 1.3V to 3.5V
z ± 1% DAC Accuracy
z Fast Transient Response
z Full 0% to 100% Duty Cycle Driver
z Fixed 200kHz Switching Frequency
z Adaptive Non-Overlapping Gate Driver
z Over-Current Monitor Uses MOSFET RDS(ON)
z Over-Voltage Protection Uses Lower MOSFET
Linear Section
z Fixed Linear Regulator Output Voltage
z MOSFET or NPN Driving Capability
z Ultra Fast Response Speed
z Under-Voltage Protection
z Internal Thermal Shutdown
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Full Motherboard Power Regulation for Computer
z Low-voltage Distributed Power Supplies
Pin Configurations
(TOP VIEW)
VCC
VID4
VID3
VID2
VID1
VID0
PGOOD
FAULT
SS
NC
FB2
VIN2
2
3
4
5
6
7
8
9
10
11
12
24 UGATE1
23 PHASE1
22 LGATE1
21 PGND
20 OCSET1
19 VSEN1
18 FB1
17 NC
16 FB3
15 GATE3
14 GND
13 VOUT2
SOP-24
www.richtek.com
1
1 page  
Preliminary
RT9227A
Functional Pin Description
VCC (Pin 1)
Provide a 12V bias supply for the IC to this pin. This pin
also provides the gate bias charge for all the MOSFETs
controlled by the IC.
VID0, VID1, VID2, VID3, VID4 (Pin 6, 5, 4, 3, and 2)
VIDO-4 are the input pins to the 5-bit DAC. The states of
these five pins program the internal voltage reference,
DACOUT. The level of DACOUT sets the core converter
output voltage. It also sets the core PGOOD and OVP
thresholds. Table 1 specifies the DACOUT voltage of 32
combinations of VID levels.
PGOOD (Pin 7)
PGOOD is an open collector output used to indicate the
status of the output voltage. This pin is pulled low when
the core output is not within ±10% of the DACOUT
reference voltage and the other outputs are below their
under-voltage thresholds.
The PGOOD output is open for '11111' VID codes that
inhibit operation. See table 1.
FAULT (Pin 8)
This pin is low during normal operation, but it is pulled to
about 8V (VCC = 12V) in the event of an over-voltage or
over-current condition.
SS (Pin 9)
Connect a capacitor from this pin to ground. This capacitor,
along with an internal 11μA (VSS >1V) current source, sets
the soft-start interval of the converter.
FB2 (Pin 11)
Connect this pin to VOUT2 to set the linear regulator output
voltage.
VIN2 (Pin 12)
This pin supplies power to the internal regulator. Connect
this pin to a suitable 3.3V source.
Additionally, this pin is used to monitor the 3.3V supply.
If, following a startup cycle, the voltage drops below 2.55V
(typically), the chip shuts down. A new soft-start cycle is
initiated upon return of the 3.3V supply above the under-
voltage threshold.
VOUT2 (Pin 13)
Output of the linear regulator. Supplies current up to 230mA.
GND (Pin 14)
Signal ground for the IC. All voltage levels are measured
with respect to this pin.
GATE3 (Pin 15)
Connect this pin to the gate of an external MOSFET or the
base of an NPN. This pin provides the drive for the linear
controller's pass transistor.
FB3 (Pin 16)
Connect this pin to VOUT3 to set the linear controller output
voltage.
FB (Pin 18)
The FB1 pin is the inverting input of the error amplifier.
VSEN1 (Pin 19)
This pin is connected to the PWM converter's output
voltage. The PGOOD and OVP comparator circuits use
this signal to report output voltage status and for over
voltage protection.
OCSET1 (Pin 20)
Connect a resistor (ROCSET1) from this pin to the drain of
the upper MOSFET. ROCSET1, an internal 200μA current
source (IOCSET1), and the upper MOSFET on-resistance
(RDS(ON)) set the PWM converter over-current (OC) trip
point according to the following equation :
IPEAK = IOCSET1 × ROCSET1
RDS(ON)
DS9227A-05 March 2007
www.richtek.com
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet RT9227A.PDF ] | |
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