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PDF RT9224C Data sheet ( Hoja de datos )
| Número de pieza | RT9224C | |
| Descripción | VRM 9.0 Synchronous PWM Buck Converter Controller and Output Voltage Monitor | |
| Fabricantes | Richtek Technology | |
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Preliminary
RT9224C
VRM 9.0 Synchronous PWM Buck Converter
Controller and Output Voltage Monitor
General Description
The RT9224C 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 1.075V to 1.85V by a 5-bit DAC which
provides initial accuracy of ±1%. The RT9224C 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.
The RT9224C 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
RT9224C
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
1.075V to 1.85V
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 9.0 Microprocessors
Low-Voltage Distributed Power Supplies
High Power 5V to 1.075V to 1.85V Switching Regulator
Pin Configurations
(TOP VIEW)
VSEN
OCSET
SS
VID0
VID1
VID2
VID3
VID4
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
DS9224C-02 March 2004
www.richtek.com
1
1 page  
Preliminary
Table 1 Output Voltage Program
Pin Name
VID4
1
VID3
1
VID2
1
VID1
1
VID0
1
11110
11101
11100
11011
11010
11001
11000
10111
10110
10101
10100
10011
10010
10001
10000
01111
01110
01101
01100
01011
01010
01001
01000
00111
00110
00101
00100
00011
00010
00001
00000
Note: (1) 0:Connected to GND (2) 1:Open
RT9224C
Nominal Output Voltage
DACOUT
1.075V
1.100V
1.125V
1.150V
1.175V
1.200V
1.225V
1.250V
1.275V
1.300V
1.325V
1.350V
1.375V
1.400V
1.425V
1.450V
1.475V
1.500V
1.525V
1.550V
1.575V
1.600V
1.625V
1.650V
1.675V
1.700V
1.725V
1.750V
1.775V
1.800V
1.825V
1.850V
DS9224C-02 March 2004
www.richtek.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet RT9224C.PDF ] | |
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