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

Part # RT9221
Description  PROGRAMMABLE SYNCHRONOUS PWM BUCK CONVERTER WITH 1.5V / 2.5V DUAL LOW DROPOUT LINEAR REGULATOR CONTROLLER
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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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
1
2
3
4
5
6
7
8
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
11
12
13
14
15
16
17
18
19
20
21
22
23
24


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