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  Richtek Technology Electronic Components Datasheet  

RT9222 Datasheet

Programmable Synchronous PWM Buck Converter

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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
1


  Richtek Technology Electronic Components Datasheet  

RT9222 Datasheet

Programmable Synchronous PWM Buck Converter

No Preview Available !

RT9222
Absolute Maximum Ratings
z VCC to GND
z PGND to GND
z BSTH and BSTL to GND
z Ambient Temperature Range
z Junction Temperature Range
z Storage Temperature Range
z Lead Temperature (Soldering, 10 sec.)
z Package Thermal Resistance
SOP-24, θJA
-0.3 to +5.5V
± 0.3V
-0.3 to +14V
0 to +70°C
0 to +125°C
-65 to +150°C
300°C
75°C/W
Electrical Characteristics
(VCC = 5V; GND = 0V; PGNDH = PGNDL = 0V; VSEN = VOUT; 0mV < (VCSP-VCSN) < 60mV; TA = 25°C)
Parameter
Symbol
Test Conditions
Min Typ Max
Switching Section
Output Voltage
Supply Voltage
Supply Current
Load Regulation
Line Regulation
Power On Reset Trip Point
VOUT IO = 2A
VCC VCC
ICC
VLOAD IO = 0.8A to 15A
VLINE VCC = 4.75V to 5.25V
VCC Rising
-- (1) --
4.5 -- 5.5
-- 3 6
-- 1 --
-- 0.5 --
-- 4.2 --
Current Limit Voltage
Oscillator Frequency
VLIMIT VCSP - VCSN
65 75 85
170 200 230
Oscillator Max Duty Cycle
DH Source
DH Sink
DL Source
DL Sink
OVP Threshold Voltage
DMAX
VBSTH - VDH = 1V
VDH – VPGNDH = 1V
VBSTL - VDL = 3V
VDL – VPGNDL = 1V
90 95 --
-- 3.5 --
-- 3.5 --
-- 2 --
-- 2 --
-- 120 --
OVP Source Current
Power Good Threshold Voltage
IOVP
VOVP = 3.0V
VSEN Rising
10 -- --
87 -- 113
Linear Sections
Quiescent Current
Reference Voltage
Gain (AOL)
Load Regulation
Line Regulation
Note: (1) See output voltage table.
IQ
VREF
LDOV = 12V
LDOS1/2 to GATE1/2
VLOAD IO = 0 to 5A
VLINE LDOV = 11.4V to 12.6V
--
1.240
--
--
--
--
1.265
65
1
1
5
1.290
--
--
--
Units
--
V
mA
%
%
V
mV
KHz
%
%
mA
%
mA
V
dB
%
%
www.richtek-ic.com.tw
2
DS9222-04 May 2001


Part Number RT9222
Description Programmable Synchronous PWM Buck Converter
Maker Richtek
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RT9222 Datasheet PDF






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