RT9224E(2001) Ver la hoja de datos (PDF) - Richtek Technology
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RT9224E
(Rev.:2001)
(Rev.:2001)
Richtek Technology
RT9224E Datasheet PDF : 8 Pages
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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
Features
z Simple Voltage-mode PWM Control with Buck
Rectification
z ±1% DAC Output Voltage Accuracy
z 5-Bit Digital-to-Analog Output Voltage Range
from 1.05V to 1.825V
z Fast Transient Response and Excellent Output
Voltage Regulation
z Fault Protection for Over-voltage and Over-
current
z Power-good Output Voltage Monitor
Applications
z Power Supply for VRM 8.5 Microprocessors
z Low-voltage Distributed Power Supplies
z High Power 5V to 1.05V ~ 1.85V Switching
Regulator
Pin Configurations
Part Number
RT9224ECS
(Plastic SOP-20)
Pin Configurations
TOP VIEW
VSEN 1
OCSET 2
SS 3
VID25 4
VID0 5
VID1 6
VID2 7
VID3 8
NC 9
FB 10
20 NC
19 OVP
18 VCC
17 LGATE
16 PGND
15 BOOT
14 UGATE
13 PHASE
12 PGOOD
11 GND
DS9224E-01 May 2001
www.richtek.com
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