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CONTROLLER IC. IRU3033 Datasheet

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CONTROLLER IC. IRU3033 Datasheet






IRU3033 IC. Datasheet pdf. Equivalent




IRU3033 IC. Datasheet pdf. Equivalent





Part

IRU3033

Description

8-PIN PWM SWITCHER AND LINEAR CONTROLLER IC



Feature


( DataSheet : www.DataSheet4U.com ) Dat a Sheet No. PD94147 IRU3033 8-PIN PWM SWITCHER AND LINEAR CONTROLLER IC FEATU RES DESCRIPTION LDO Controller allows t he use of a low cost pass transistor fo r the I/O supply 8-Pin SOIC combines sw itching and linear controller Internal pre-regulator eliminates cross talk bet ween switching and linear regulators Au tomatic shut down .
Manufacture

International Rectifier

Datasheet
Download IRU3033 Datasheet


International Rectifier IRU3033

IRU3033; of the linear regulator when connected t o the Vcc2 detect pin On-Board MOSFET D river Fastest transient response of any controller method (0 to 100% Duty Cycl e in 100ns) 1% Internal Voltage Referen ce Internal Under-Voltage Lockout prote cts MOSFET during start-up The IRU3033 IC combines a switching controller and a linear regulator controller all in a compact 8-pin surf.


International Rectifier IRU3033

ace mount package, providing a total sol ution for dual supply processor applica tions such as an Intel P55C™ , AMD K6 ™ , as well as Cyrix 6X86L™ and the M2™ processors. Typically in these a pplications a dual supply regulator con verts 5V to 3.3V for I/O supply and a j umper programmable supply of 1.25V to 3 .5V for Core supply. The linear regulat or controller portion in t.


International Rectifier IRU3033

he IRU3033 is a programmable controller allowing flexibility for the I/O regula tor and has a minimum of 50mA drive cur rent capability designed to provide amp le current for an external pass transis tor. The IC uses an internal regulator generated from the 12V supply to power the controller as well as the 12V suppl y to drive the power MOSFET, allowing a low cost N-channe.

Part

IRU3033

Description

8-PIN PWM SWITCHER AND LINEAR CONTROLLER IC



Feature


( DataSheet : www.DataSheet4U.com ) Dat a Sheet No. PD94147 IRU3033 8-PIN PWM SWITCHER AND LINEAR CONTROLLER IC FEATU RES DESCRIPTION LDO Controller allows t he use of a low cost pass transistor fo r the I/O supply 8-Pin SOIC combines sw itching and linear controller Internal pre-regulator eliminates cross talk bet ween switching and linear regulators Au tomatic shut down .
Manufacture

International Rectifier

Datasheet
Download IRU3033 Datasheet




 IRU3033
( DataSheet : www.DataSheet4U.com )
Data Sheet No. PD94147
IRU3033
8-PIN PWM SWITCHER AND LINEAR CONTROLLER IC
FEATURES
DESCRIPTION
LDO Controller allows the use of a low cost pass
transistor for the I/O supply
8-Pin SOIC combines switching and linear
controller
Internal pre-regulator eliminates cross talk
between switching and linear regulators
Automatic shut down of the linear regulator when
connected to the Vcc2 detect pin
On-Board MOSFET Driver
Fastest transient response of any controller
method (0 to 100% Duty Cycle in 100ns)
1% Internal Voltage Reference
Internal Under-Voltage Lockout protects MOSFET
during start-up
APPLICATIONS
Dual supply low voltage processor applications,
such as: P55C, CYRIX M2, POWER PC
and AMD K6
Simple 5V to 3.3V switcher for Pentium with AGP
or Pentium IIapplications
The IRU3033 IC combines a switching controller and a
linear regulator controller all in a compact 8-pin surface
mount package, providing a total solution for dual sup-
ply processor applications such as an Intel P55C, AMD
K6, as well as Cyrix 6X86Land the M2proces-
sors. Typically in these applications a dual supply regu-
lator converts 5V to 3.3V for I/O supply and a jumper
programmable supply of 1.25V to 3.5V for Core supply.
The linear regulator controller portion in the IRU3033 is a
programmable controller allowing flexibility for the I/O
regulator and has a minimum of 50mA drive current ca-
pability designed to provide ample current for an exter-
nal pass transistor. The IC uses an internal regulator
generated from the 12V supply to power the controller
as well as the 12V supply to drive the power MOSFET,
allowing a low cost N-channel MOSFET switch to be
used. The IC also includes an error comparator for fast
transient response, a precise voltage reference for set-
ting the output voltage as well as a direct drive of the
MOSFET for the minimum part count.
TYPICAL APPLICATION
Q1
5V
C1 R10
12V
R9
C8
V12 Drv2 VFB2
IRU3033
Drv1
Gnd
V12(SW) VFB1 VHYST
R6
C6 I/O
D2 R7
5V
CPU
R8
Vcc2 Det
C3
L1
R3 C5
L2
R4
Core
Q2
C2
D1
R5
Figure 1 - Typical application of IRU3033 in a flexible mother board designed for
Intel P55, P54, AMD K5, K6as well as Cyrix M1and M2applications.
C7
Notes: P54C, P55C, Pentium II are
trademarks of Intel Corp. K5 & K6
are trademarks of AMD Corp. Cyrix
6X86L, M1, M2 are trademarks of
Cyrix Corp. Power PC is trademark
of IBM Corp.
PACKAGE ORDER INFORMATION
TA (°C)
0 To 70
8-PIN PLASTIC SOIC (S)
IRU3033CS
Rev. 1.7
07/17/02
www.irf.com
1
www.DataSheet4U.com




 IRU3033
IRU3033
ABSOLUTE MAXIMUM RATINGS
V12,V12(SW) Supply Voltages ....................................... 20V
Fb Pin Voltages ........................................................ -0.3V To 5V
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature ................................ 0°C To 150°C
PACKAGE INFORMATION
8-PIN PLASTIC SOIC (S)
TOP VIEW
Drv1 1
8 V12
V12(SW) 2
VFB1 3
7 Drv2
6 VFB2
VHYST 4
5 Gnd
uJA =1608C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, the following specification applies over V12=V12(SW)=12V and TA=0 to 70°C. Low duty
cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature.
PARAMETER
Linear Controller Section
Fb Voltage Initial Accuracy
Fb Voltage Total Variation
Fb Voltage Line Regulation
Fb Input Bias Current
Maximum Drive Current
V12 Supply Current
Switching Controller Section
Fb Voltage Initial Accuracy
Fb Voltage Total Variation
Fb Voltage Line Regulation
Fb Input Bias Current
Min On Time
Min Off Time
VHYST Pin Output-HI
VHYST Pin Output-LO
Supply Current
Maximum Duty Cycle
Minimum Duty Cycle
Gate Drive Rise/Fall Time
SYM
TEST CONDITION
VFB2
TJ=258C, Drv2=VFB2, CL=100mF
Drv2=VFB2, CL=100mF
10<V12<14V, Drv2=VFB2, CL=100mF
IFB2 VFB2=1.25V
IDRV(max) VFB2=1V, VFB1=1.5V
I12 VFB2=1V, VFB1=1.5V, IDRV2=0
VFB1 TJ=258C
IFB1
I12(SW)
DMAX
DMIN
VGATE
VFB1=1.25V
VFB1 is sq wave with 300ns on
time and 2ms off time
VFB1 is sq wave with 300ns off
time and 2ms on time
ISOURCE=500mA, VFB1=1.5V
ISINK=500mA, VFB1=1V
VFB1=1V, VFB2=1.5V
VFB1=1V
VFB1=1.5V
Load=IRL3303
MIN TYP MAX UNITS
1.237
1.225
-1
1.250
1.250
0.2
50
5
1.262
1.275
+1
V
V
%
mA
mA
mA
1.237
1.225
-1
1.250
1.250
0.2
800
1.262
1.275
+1
V
V
%
mA
ns
800 ns
11 V
1V
10 mA
100 %
0%
70 ns
2 www.irf.com
Rev. 1.7
07/17/02




 IRU3033
IRU3033
PIN DESCRIPTIONS
PIN #
1
2
3
4
5
6
7
8
PIN SYMBOL PIN DESCRIPTION
Drv1 The PWM output of the switching controller. This pin is a totem pole drive that is con-
nected to the gate of the power MOSFET. A resistor may be placed from this pin to the
gate in order to reduce switching noise.
V12(SW)
This pin supplies the voltage to the PWM drive and hysteresis circuitry and it is connected
to the 12V supply. A 1mF, high frequency capacitor must be connected from this pin to
ground to provide the peak current for charging and discharging of the MOSFET.
VFB1 A resistor divider from this pin to the output of the switching regulator and ground sets the
Core supply voltage.
VHYST
A resistor and a 10pF capacitor is connected from this pin to the VFB1 pin to set the output
ripple voltage for the switching regulator.
Gnd This pin is connected to the IC substrate and must be connected to the lowest potential in
the system.
VFB2 The feedback pin of the linear regulator. A resistor divider from this pin to the output of the
linear regulator and ground sets the I/O supply voltage.
Drv2 The drive pin of the linear regulator. This pin controls the base of a transistor or the gate
of a MOSFET acting as the series pass element for the linear regulator.
V12 This pin provides the biasing for the chip and drive for the linear regulator controller. It is
connected to 12V supply. A 10V resistor in series from this pin to the 12V supply and a
1mF, high frequency capacitor connected from this pin to ground is required to filter the
switching noise of the switching regulator.
BLOCK DIAGRAM
V12(SW)
2
VHYST
4
Drv 1
1
Gnd
5
VFB1
3
V12
8
UVLO
PWM Control
1.25V
VREF
5V Reg
Drv2
7
VFB2
6
Figure 2 - Simplified block diagram of the IRU3033.
Rev. 1.7
07/17/02
www.irf.com
3






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