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IRU3033
8-PIN PWM SWITCHER AND LINEAR CONTROLLER IC
International
TOR Rectifier
Data Sheet No. PD94147
IRU3033
8-PIN PWM SWITCHER AND LINEAR CONTROLLER IC
FEATU RES
El LDO Controller allows the use of a low cost pass
transistor for the HO supply
ta 8-Pin SOIC combines switching and linear
controller
El Internal pre-regulator eliminates cross talk
between switching and linear regulators
El Automatic shut down of the linear regulator when
connected to the Vch detect pin
El On-Board MOSFET Driver
El Fastest transient response of any controller
method (0 to 100% Duty Cycle in 100ns)
El 1% Internal Voltage Reference
El Internal Under-Voltage Lockout protects MOSFET
during start-up
APPLICATIONS
El Dual supply low voltage processor applications,
such as: P5SCTM, CYRIX M2TM, POWER PCTM
and AMD K6TM
D Simple 5V to 3.3V switcher for Pentium with AGP
or Pentium llTM applications
DESCRIPTION
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 P55CTM , AMD
KBTM, as well as Cyrix 6X86LTM and the M2TM proces-
sors. Typically in these applications a dual supply regu-
lator converts 5V to 3.3V for IIO 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 l/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
5V _l: LU R
crf 10 at l
R9 -- - C6 l/O
12V 'lla, 1 D2 R7 5v
V12 Chv2 LAa CPU
I T 7 R8
= IRU3033
- Chvl tYxi V032 Det
V12 SW) WBl VHYST _i-
C - ' I
31: g R3 T cs Ctye
5'ng ', -
Notes: P54C, P55C, Pentium II are
Figure 1 - Typical application of IRU3033 in a flexible mother board designed for
Intel P55TM, P54TM, AMD K5, K6TM as well as Cyrix M1TM and MZTM applications.
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)
8-PlN PLASTIC SOIC (S)
0T0 70
IRU3033CS
Rev. 1.7
07l17/02
1
International
TOR Rectifier
IRU3033
ABSOLUTE MAXIMUM RATINGS
V12,V12(svv) Supply Voltages ....................................... 20V
Fb Pin Voltages _....................................................... -0.3V To 5V
Storage Temperature Range ......................................
Operating Junction Temperature ................................
-65°C To 150°C
0°C To 150°C
PACKAGE INFORMATION
8-PIN PLASTIC SOIC (S)
V12(SW>
VHYST a
(LA =160°C/\N
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, the following specification applies over 1/12=V12(svv)=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 SYM TEST CONDITION MIN TYP MAX UNITS
Linear Controller Section VFB2
Fb Voltage Initial Accuracy TJ=25°C, Drv2=VFaz, CL=100}LF 1.237 1.250 1.262 V
Fb Voltage Total Variation DN2=VFBZ, CL=100pLF 1.225 1.250 1.275 V
Fb Voltage Line Regulation 10
Fb Input Bias Current IFBZ VFB2=1.25V -1 +1 WA
Maximum Drive Current |DRV(max) 1/rm2=1V, VFB1=1.5V 50 mA
V12 Supply Current I12 VF32=1V, VFB1=1.5V, |DRV2=O 5 mA
Switching Controller Section
Fb Voltage Initial Accuracy VFB1 TJ=25°C 1.237 1.250 1.262 V
Fb Voltage Total Variation 1.225 1.250 1.275 V
Fb Voltage Line Regulation 0.2 %
Fb Input Bias Current |FB1 VFB1=1.25V -1 +1 wA
Min On Time VFB1 is sq wave with 300ns on 800 ns
time and 2ws offtime
Min Off Time VFB1 is sq wave with 300ns off 800 ns
time and 2ws on time
VHYST Pin Output-HI ISOURCE=500MA, VFB1=1.5V 11 V
VHYST Pin Output-LO ISINK=500MA, VFB1=1V 1 V
Supply Current |12(SW) VFB1=1V, VFBz=1.5V 10 mA
Maximum Duty Cycle DMAX VFB1=1V 100 %
Minimum Duty Cycle DMIN VFB1=1.5V 0 %
Gate Drive Rise/Fall Time VGATE Load=|RL3303 70 ns
Rev. "
07I17I02
