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  Richtek Technology Electronic Components Datasheet  

RT9241 Datasheet

Two-Phase DC/DC Controller

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Preliminary
RT9241
Two-Phase DC/DC Controller for CPU Core Power Supply
General Description
The RT9241 is a two-phase buck DC/DC controller
integrated with all control functions for high
performance processor VRM. The RT9241 drives 2
buck switching stages operating in 180 degree
phase shift. The two-phase architecture provides
high output current while maintaining low power
dissipation on power devices and low stress on
input and output capacitors. The high equivalent
operating frequency also reduces the component
dimension and the output voltage ripple in load
transient.
RT9241 regulates both easily set voltage and
current loops. Precise current sharing for power
stage is achieved by differential input current sense
and processing circuit. The settings of current
sense, droop tuning and over current protection are
independent to compensation circuit of voltage loop.
The feature greatly facilitates the flexibility of CPU
power supply design and tuning.
The RT9241 uses a 5-bit DAC of 1.1V to 1.85V
(25mV/step) output with load current droop
compensation to meet the strict VRM transient
requirement. The IC monitors the VCORE voltage
for PGOOD and over voltage protection. Soft start,
over current protection and programmable under
voltage lockout are also provided to assure the
safety of microprocessor and power system.
Ordering Information
RT9241… …
Package Type
S : SOP-20
Operating temperature range
C: Commercial standard
Features
z Two-Phase Power Conversion
z VRM 9.0 DAC Output with Active Droop
Compensation for Fast Load Transient
z Precise Channel Current Sharing with
Differential Sense Input
z Hiccup Mode Over Current Protection
z Programmable Under Voltage Lockout and
Soft Start
z High Ripple Frequency, (Channel Frequency
200KHz) Times Channel Number
Applications
z Power Supply for Server and Workstation
z Power Supply for High Current Microprocessor
Pin Configurations
Part Number
Pin Configurations
RT9241CS
(Plastic SOP-20)
TOP VIEW
VID4 1
VID3 2
VID2 3
VID1 4
VID0 5
COMP 6
FB 7
ADJ 8
DVD 9
SS 10
20 VDD
19 PGOOD
18 ISP1
17 PWM1
16 PWM2
15 ISP2
14 VSEN
13 GND
12 ISN1
11 ISN2
DS9241-00 November 2001
www.richtek-ic.com.tw
1


  Richtek Technology Electronic Components Datasheet  

RT9241 Datasheet

Two-Phase DC/DC Controller

No Preview Available !

RT9241
Preliminary
Absolute Maximum Ratings
z Supply Voltage
z Input, Output or I/O Voltage
z Ambient Temperature Range
z Operating Junction Temperature Range
z Storage Temperature Range
z Power Dissipation, PD @ TA = 25°C
SOP-20
z Package Thermal Resistance
SOP-20, θJA
z Lead Temperature (Soldering, 10 sec.)
Electrical Characteristics
(VDD = 5V, GND = 0V, TA = 25°C, unless otherwise specified)
Parameter
Symbol Test Conditions
VDD Supply Current
Nominal Supply Current
Power-On Reset
IDD PWM 1,2 Open
VDD Rising Threshold
VDD Falling Threshold
VDVD Rising Trip Threshold
Oscillator
Frequency
For each phase
Ramp Amplitude
Ramp Valley
Maximum On Time of Each Channel
Reference and DAC
DACOUT Voltage Accuracy
DAC (VID0-VID4) Input Low Voltage
DAC (VID0-VID4) Input High Voltage
DAC (VID0-VID4) Bias Current
PWM Controller Error Amplifier
DC Gain
Bandwidth
Slew Rate
Current Sense GM Amplifier
CL = 10pF
ISP 1,2 Full Scale Source Current
ISP 1,2 Current for OCP
6V
GND-0.3V ~ VDD+0.3V
0°C ~ 70°C
0°C ~ 125°C
-65°C ~ 150°C
0.625W
60°C /W
260°C
Min Typ Max Units
-- 6 -- mA
4.2 4.35 4.5
3.7 3.85 4
1.19 1.25 1.31
V
V
V
170 200 230 kHz
-- 1 -- V
1.0 1.3
--
V
-- 75 -- %
-1.0 -- +1.0 %
-- -- 0.8 V
2.0 -- -- V
10 20 40 µA
-- 85 -- dB
-- 10 -- MHz
-- 5 -- V/µS
-- 50 -- µA
-- 75 -- µA
To be continued
www.richtek-ic.com.tw
2
DS9241-00 November 2001


Part Number RT9241
Description Two-Phase DC/DC Controller
Maker Richtek
Total Page 13 Pages
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