RT9222 데이터 시트보기 (PDF) - Richtek Technology
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RT9222 Datasheet PDF : 8 Pages
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RT9222
Programmable Synchronous PWM Buck Converter with
Dual Adjustable Low Dropout Linear Regulator Controller
General Description
The RT9222 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. The output level is
user-adjustable and can be programmed by two
external resistors and the internal 1.265V reference.
Ordering Information
RT9222
Package type
S : SOP-24
Operating temperature range
C: Commercial standard
Features
z Provides 3 Regulated Voltages
z N-MOSFET Driver for High Efficiency Switching
Section
z Power-good, Over-voltage, and Current-
limiting Protection for Switching Section
z Adjustable Output Voltage for Linear Section
z Linear Section Uses Low Cost NPN Transistor
as Power Device
z TTL-compatible 5-bit DAC Core Output Voltage
Applications
z Power Supply for Pentium, Pentium ProTM,
Pentium IITM, PowerPCTM, K6TM, 6x86TM, and
AlphaTM Microprocessors
z High-power 5V to 3.xV DC-DC Regulators
z Low-voltage Distributed Power Supplies
z Programmable Power Supplies
Pin Configurations
Part Number
Pin Configurations
RT9222CS
TOP VIEW
GND 1
(Plastic SOP-24) GATE1 2
LDOS1 3
LDOS2 4
VCC 5
OVP 6
PGOOD 7
CSN 8
CSP 9
PGNDH 10
DH 11
PGNDL 12
24 GATE2
23 LDOV
22 VID0
21 VID1
20 VID2
19 VID3
18 VID4
17 VSEN
16 SHDN
15 BSTH
14 BSTL
13 DL
DS9222-04 May 2001
www.richtek-ic.com.tw
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