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PDF RT9224E Data sheet ( Hoja de datos )
| Número de pieza | RT9224E | |
| Descripción | VRM 8.5 Synchronous PWM Buck Converter Controller and Output Voltage Monitor | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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Preliminary
RT9224E
VRM 8.5 Synchronous PWM Buck Converter
Controller and Output Voltage Monitor
General Description
The RT9224E is a high speed switching controller designed
for use in Synchronous DC/DC buck converter for modern
CPUs. The regulated output voltage is digitally
programmable from 1.05V to 1.825V by a 5-bit DAC which
provides initial accuracy of ±1%. The RT9224E drives two
external N-Channel MOSFETs, providing high efficiency
and eliminating the need for high cost P-Channel devices.
It senses the output current across the on-resistance of
the N-channel MOSFET and provides an adjustable current
limit without external sense resistor.
RT9224E monitors the output voltage and provides the
output signal for power-good and over-voltage protections.
The switching frequency is 200kHz. The high switching
frequency cooperating with a high speed error amplifier
maintains a fast response to the dynamic load of modern
CPUs.
Ordering Information
RT9224E
Package Type
S : SOP-20
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
Features
Simple Voltage-Mode PWM Control with Buck
Rectification
±1% DAC Output Voltage Accuracy
5-Bit Digital-to-Analog Output Voltage Range from
1.05V to 1.825V
Fast Transient Response and Excellent Output
Voltage Regulation
Fault Protection for Over-Voltage and Over-Current
Power-Good Output Voltage Monitor
Applications
Power Supply for VRM 8.5 Microprocessors
Low-voltage Distributed Power Supplies
High Power 5V to 1.05V to 1.85V Switching Regulator
Pin Configurations
(TOP VIEW)
VSEN
OCSET
SS
VID25
VID0
VID1
VID2
VID3
NC
FB
2
3
4
5
6
7
8
9
10
20 NC
19 OVP
18 VCC
17 LGATE
16 PGND
15 BOOT
14 UGATE
13 PHASE
12 PGOOD
11 GND
SOP-20
DS9224E-02 March 2004
www.richtek.com
1
1 page  
Preliminary
RT9224E
Table 1 Output Voltage Program
VID25
0
VID3
0
Pin Name
VID2
1
VID1
0
VID0
0
Nominal Output Voltage DACOUT
1.050V
10100
1.075V
00011
1.100V
10011
1.125V
00010
1.150V
10010
1.175V
00001
1.200V
10001
1.225V
00000
1.250V
10000
1.275V
01111
1.300V
11111
1.325V
01110
1.350V
11110
1.375V
01101
1.400V
11101
1.425V
01100
1.450V
11100
1.475V
01011
1.500V
11011
1.525V
01010
1.550V
11010
1.575V
01001
1.600V
11001
1.625V
01000
1.650V
11000
1.675V
00111
1.700V
10111
1.725V
00110
1.750V
10110
1.775V
00101
1.800V
10101
1.825V
Note: (1) 0:Connected to GND (2) 1:Open
DS9224E-02 March 2004
www.richtek.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet RT9224E.PDF ] | |
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