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IRU3011 데이터시트 PDF




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부품번호 IRU3011 기능
기능 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC
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IRU3011 데이터시트, 핀배열, 회로
Data Sheet No. PD94143
IRU3011
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC
FEATURES
DESCRIPTION
Dual Layout compatible with HIP6004A
Designed to meet Intel specification of VRM8.4 for
Pentium III
On-Board DAC programs the output voltage from
1.3V to 3.5V. The IRU3011 remains on for VID code
of (11111).
Loss-less Short Circuit Protection
Synchronous operation allows maximum efficiency
Patented architecture allows fixed frequency
operation as well as 100% duty cycle during
dynamic load
Over-Voltage Protection Output
Soft-Start
High current totem pole driver for direct driving of the
external power MOSFET
Power Good Function
APPLICATIONS
Pentium III & Pentium IIprocessor DC to DC
converter application
Low Cost Pentium with AGP
The IRU3011 controller IC is specifically designed to meet
Intel specification for latest Pentium IIImicroproces-
sor applications as well as the next generation P6 fam-
ily processors. These products feature a patented topol-
ogy that in combination with a few external components
as shown in the typical application circuit,will provide in
excess of 20A of output current for an on-board DC/DC
converter while automatically providing the right output
voltage via the 5-bit internal DAC. These devices also
features, loss less current sensing by using the RDS(ON)
of the high side Power MOSFET as the sensing resis-
tor, a Power Good window comparator that switches its
open collector output low when the output is outside of a
±10% window and an Over-Voltage Protection output.
Other features of the device are: Under-voltage lockout
for both 5V and 12V supplies, an external programmable
soft-start function as well as programming the oscillator
frequency by using an external capacitor.
TYPICAL APPLICATION
5V
C1
L1
C5
C3
R1
R2
Q1
Note: Pentium II and Pentium III are trade marks of Intel Corp.
Q2
R3
C8
R4
L2
C10
VOUT
(1.3V - 3.5V)
12V
C2
VID4
VID3
VID2
VID1
VID0
C6
D1 C4
V12 CS+
NC/Gnd
SS
D4
D3
HDrv
D2
NC/
Boot
CS-
IRU3011
D1 D0
LDrv
Ct/Rt
Gnd NC/Sen
V FB
R5
V5/Comp
OVP PGd C9
C7
Figure 1 - Typical application of the IRU3011.
C11
R7
R9
C12
R8
C13
R6
C14
Power Good
OVP
PACKAGE ORDER INFORMATION
TA (8C)
0 To 70
DEVICE
PACKAGE
IRU3011CW 20-Pin Plastic SOIC WB (W)
VID VOLTAGE RANGE
1.3V to 3.5V
Rev. 1.6
08/20/02
www.irf.com
1




IRU3011 pdf, 반도체, 판매, 대치품
IRU3011
PIN DESCRIPTIONS
PIN#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
PIN SYMBOL
NC
CS+
SS
D0
D1
D2
D3
D4
V5
VFB
NC
PGd
CS-
HDrv
NC
Gnd
LDrv
V12
OVP
Ct
PIN DESCRIPTION
No connection.
This pin is connected to the Drain of the power MOSFET of the Core supply and it
provides the positive sensing for the internal current sensing circuitry. An external resis-
tor programs the CS threshold depending on the RDS of the power MOSFET. An external
capacitor is placed in parallel with the programming resistor to provide high frequency
noise filtering.
This pin provides the soft-start for the switching regulator. An internal current source
charges an external capacitor that is connected from this pin to the ground which ramps
up the outputs of the switching regulator, preventing the outputs from overshooting as
well as limiting the input current. The second function of the Soft-Start cap is to provide
long off time for the synchronous MOSFET or the Catch diode (HICCUP) during current
limiting.
LSB input to the DAC that programs the output voltage. This pin can be pulled up exter-
nally by a 10K resistor to either 3.3V or 5V supply.
Input to the DAC that programs the output voltage. This pin can be pulled-up externally
by a 10KV resistor to either 3.3V or 5V supply.
Input to the DAC that programs the output voltage. This pin can be pulled-up externally
by a 10K resistor to either 3.3V or 5V supply.
MSB input to the DAC that programs the output voltage. This pin can be pulled-up exter-
nally by a 10K resistor to either 3.3V or 5V supply.
This pin selects a range of output voltages for the DAC.
5V supply voltage.
This pin is connected directly to the output of the Core supply to provide feedback to the
Error comparator.
No connection.
This pin is an open collector output that switches LO when the output of the converter is
not within ±10% (typ) of the nominal output voltage. When PGd pin switches LO the
saturation voltage is less than 0.4V at 3mA.
This pin is connected to the Source of the power MOSFET for the Core supply and it
provides the negative sensing for the internal current sensing circuitry.
Output driver for the high side power MOSFET.
No connection.
This pin serves as the ground pin and must be connected directly to the ground plane. A
high frequency capacitor (0.1 to 1mF) must be connected from V5 and V12 pins to this
pin for noise free operation.
Output driver for the synchronous power MOSFET.
This pin is connected to the 12 V supply and serves as the power Vcc pin for the output
drivers. A high frequency capacitor (0.1 to 1mF) must be connected directly from this pin
to ground pin in order to supply the peak current to the power MOSFET during the
transitions.
Over-voltage comparator output.
This pin programs the oscillator frequency in the range of 50KHz to 500KHz with an
external capacitor connected from this pin to the ground.
4 www.irf.com
Rev. 1.6
08/20/02

4페이지










IRU3011 전자부품, 판매, 대치품
IRU3011
IRU3011 and HIP6004B Dual Layout Parts List
Ref Desig Description
Q1 MOSFET
Q2 MOSFET
L1 Inductor
Qty
1
1
1
L2 Inductor
1
C1
C2, 9
C3
C5
C6
C7
C8
C10
C14
C15
R1
R2, 3, 4
R5
R6
R9
R10
R11
R12
R13
Capacitor, Electrolytic
Capacitor, Ceramic
Capacitor, Electrolytic
Capacitor, Ceramic
Capacitor, Ceramic
Capacitor, Ceramic
Capacitor, Ceramic
Capacitor, Electrolytic
Capacitor, Ceramic
Capacitor, Ceramic
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
1
2
2
1
1
1
1
6
1
1
1
3
1
1
1
1
1
1
1
Part #
IRL3103s, TO-263 package
IRL3103D1S, TO-263 package
L=1mH, 5052 core with 4 turns of
1.0mm wire
L=2.7mH, 5052B core with 7 turns of
1.2mm wire
10MV470GX, 470mF, 10V
1mF, 0603
10MV1200GX, 1200mF, 10V
220pF, 0603
1mF, 0805
150pF, 0603
1000pF, 0603
6MV1500GX, 1500mF, 6.3V
0.1mF, 0603
4.7mF, 1206
3.3KV, 5%, 0603
4.7V, 5%, 1206
0V, 0603
10KV, 5%, 0603
100V, 1%, 0603
220V, 1%, 0603
330V, 1%, 0603
22KV, 1%, 0603
10V, 5%, 0603
Manuf
IR
IR
Micro Metal
Micro Metal
Sanyo
Sanyo
Sanyo
Note 1: R10, R11, C15, R9, and R12 set the Vcore 2% higher for level shift to reduce CPU transient voltage.
Rev. 1.6
08/20/02
www.irf.com
7

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