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  Richtek Technology Electronic Components Datasheet  

RT9238 Datasheet

VRM8.5 PWM and Triple Linear Power System Controller

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Preliminary
RT9238
VRM8.5 PWM and Triple Linear Power System Controller
General Description
The RT9238 is a 4-in-one power controller optimized
for high-performance microprocessor and computer
applications. The IC integrates a PWM controller,
triple linear controller as well as monitoring and
protection functions into a 28-pin SOP package. The
PWM controller regulates the microprocessor core
voltage with a synchronous buck converter. The first
linear controller supplies the computer system’s
AGTL+ 1.2V bus power. The second linear controller
provides power for the 1.5V AGP bus and the 3rd
linear controller provides 1.8V power for the chipset
core voltage and/or cache memory circuits.
The RT9238 features an Intel VRM8.5 compatible,
TTL 5-bit programmable DAC that adjusts the core
voltage from 1.090V to 1.865V in 25mV steps. The 5-
bit DAC has a typical ±1% tolerance. The linear
regulators provide fixed output voltages of 1.2V
(VOUT2), 1.5V (VOUT3) and 1.8V (VOUT4) or user-
adjustable with an internal 1.265V reference. All the
three linear regulators drive external N-MOSFET or
NPNs bipolar for the pass transistor.
The RT9238 monitors all the output voltages. A
power-good signal is issued when the core voltage is
within ±10% of the DAC setting and the other levels
are above their under-voltage levels. Additional build-
in over-voltage protection for the core output uses the
lower MOSFET to prevent output voltage above
115% of the DAC setting. The PWM over-current
function monitors the output current using the voltage
drop across the MOSFET’s RDS(ON), which
eliminates the need for a current sensing resistor.
Applications
z Motherboard Power Regulation for Computers
Features
z 4-in-one Regulated Voltages for Microprocessor
Core, AGTL+ Bus, AGP Bus Power, and
North/South Bridge Core
z Compatible with ISL6524
z Power-good Output Voltage Monitor
Switching section
z VRM8.5 TTL-Compatible 5-bit DAC
Programmable from 1.090V to 1.865V
z ±1% DAC Accuracy
z Fast Transient Response
z VRM 8.5 Voltage Droop Tuning Uses MOSFET
R DS(ON)
z Fixed 200KHz Switching Frequency
z Adaptive Non-overlapping Gate Driver
z Over-current Monitor Uses MOSFET RDS(ON)
z Over-voltage Protection Uses Lower MOSFET
Linear Section
z Fixed or User-adjustable Linear Regulator
Output Voltage
z MOSFET and NPN Driving Capability
z Ultra Fast Response Speed
z Under-voltage Protection
z Internal Thermal Shutdown
Pin Configurations
Part Number
Pin Configurations
RT9238CS
(Plastic SOP-28)
DRIVE2
FIX
VID3
1
2
3
VID2 4
VID1 5
VID0 6
VID25 7
PGOOD 8
VTTPG 9
FAULT/VID4 10
VSEN2 11
SS24 12
SS13 13
VSEN4 14
28 VCC
27 UGATE1
26 PHASE1
25 LGATE1
24 PGND
23 OCSET1
22 FB1
21 VDAC
20 ICOMP
19 VSEN3
18 DRIVE3
17 GND
16 VAUX
15 DRIVE4
DS9238-01 July 2001
www.richtek-ic.com.tw
1


  Richtek Technology Electronic Components Datasheet  

RT9238 Datasheet

VRM8.5 PWM and Triple Linear Power System Controller

No Preview Available !

RT9238
Preliminary
Ordering Information
RT9238… …
Package type
S : SOP-28
Operating temperature range
C: Commercial standard
Typical Application Circuit
L1
5V R1 1µH + C1
12V 2000µF
10
VAUX
VTT
VOUT2
1.2V
VTTPG
Q3
PHD3055E
+ C5
1000µF
R6
1K
AGP
VOUT3
1.5V
MCH
1V.O8UVT4
Q4
PHD3055E
+ C9
560µF
C8
1µF
Q5
2SD1802
+ C11
C10
560µF 1µF
C14 Z1
1µF 15V
28
VCC
FIX
2 FIX
23
OCSET1
PGOOD 8
UGATE1 27
1 DRIVE2 PHASE1 26
11 VSEN2 LGATE1 25
C6
1µF
RT9238
PGND
24
9 VTTPG
FB1 22
16 VAUX
VDAC 21
+ C15
10µF
ICOMP 20
18 DRIVE3
VID25
7
6
19
15
14
VSEN3
VID0
VID1
VID2
VID3
FAULT/VID4
5
4
3
10
DRIVE4
SS24 12
VSEN4
SS13 13
GND
17
C2
1000pF
R2
1K
Q1
PHB83N03LT
L2; 1.8µH
Q2
PHB95N03LT
R6
1K
VID25
VID0
VID1
VID2
VID3
FAULT
C16
10nF
C12
0.1µF
C13
0.1µF
PGOOD
R3
10K
+ C3
8000µF
VCORE VOUT1
C4 VRM8.5
1µF
C17
1µF
* C17 near the FB1 pin
as close as possible
Fig.1 VRM 8.5 Power Solution
www.richtek-ic.com.tw
2
DS9238-01 July 2001


Part Number RT9238
Description VRM8.5 PWM and Triple Linear Power System Controller
Maker Richtek
Total Page 24 Pages
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