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RT9221 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. RT9221
Description  PROGRAMMABLE SYNCHRONOUS PWM BUCK CONVERTER WITH 1.5V / 2.5V DUAL LOW DROPOUT LINEAR REGULATOR CONTROLLER
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RT9221 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

   
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RT9221
DS9222-05 May 2001
www.richtek-ic.com.tw
1
Programmable Synchronous PWM Buck Converter with
1.5V/2.5V Dual Low Dropout Linear Regulator Controller
General Description
The RT9221 integrates a PWM controller and two
low-dropout linear regulators into a single chip. The
PWM controller provides the CPU core voltage
controlled by a 5-bit DAC and the linear section
regulates power for GTL bus, clock driver or other
circuits on motherboards. The PWM controller
provides an adjustable Intel-compatible 1.3V~3.5V
output voltage. The synchronous N-MOSFET driver
with 200 KHz switching frequency optimizes the
efficiency, device size, and cost built-in over–voltage
and current-limiting protection prevent the CPU from
damage. Power-good signal is sent when the core
voltage is within ±10% of the setting point.
The linear section is a low dropout regulator which
drives low cost NPN transistors to supply the 1.5V
and 2.5V regulated output power.
Ordering Information
RT9221
Features
Provides 3 Regulated Voltages
N-MOSFET
Driver
for
High
Efficiency
Switching Section
Power-good,
Over-voltage,
and
Current-
limiting Protection for Switching Section
1.5V and 2.5V Fixed Output Voltage for Linear
Section
Linear Section Uses Low Cost NPN Transistor
as Power Device
TTL-compatible
5-bit
DAC
Core
Output
Voltage
Applications
Power Supply for Pentium, Pentium Pro
TM,
Pentium II
TM, Power PCTM, K6TM, 6×86TM, and
Alpha
TM Microprocessors
High-power 5V to 3.xV DC-DC Regulators
Low-voltage Distributed Power Supplies
Programmable Power Supplies
Pin Configurations
Part Number
Pin Configurations
RT9221CS
(Plastic SOP-24)
TOP VIEW
Operating temperature range
C: Commercial standard
Package type
S : SOP-24
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9
10
GATE1
LDOS1
LDOS2
VCC
OVP
PGOOD
CSN
CSP
PGNDH
GATE2
LDOV
VID0
VID1
VID2
VID3
VID4
VSEN
SHDN
BSTH
GND
PGNDL
DH
BSTL
DL
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