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IRU3034CS
8 Pin PWM Switcher CIC with Current Limiting in a 8-Pin SOIC(NB) package
Data Sheet No. PD94148
IRU3034
International
TOR Rectifier
8-PIN PWM SWITCHER CONTROLLER IC
WITH CURRENT LIMITING
FEATURES DESCRIPTION
EI 8-Pin SOIC switching controller with The IRU3034 IC provides a low cost switching controller
HICCUP current limiting reduces diode power with true short circuit protection all in a compact 8-pin
dissipation to less than 1% of normal operation surface mount package, providing a low cost switching
EI Soft-Start capacitor allows for smooth output solution for dual supply processor applications that re-
voltage ramp up quire switching regulator for the 3.3V supply such as
I: On-Board MOSFET Driver the applications with AGP on-board. Typically in these
D Fastest transient response of any controller applications, a dual supply regulator converts 5V to 3.3V
method. (0 to 100% Duty Cycle in 100ns) for l/O supply and a jumper programmable supply of
D 1% Internal Voltage Reference 1.25V to 3.5V for Core supply. The IC uses an internal
D Internal Under-Voltage Lockout protects MOSFET regulator generated from the 12V supply to power the
during start-up controller as well as the 12V supply to drive the power
MOSFET, allowing a low cost N-channel MOSFET to be
APPLICATIONS used. The IC also includes an error comparator for fast
EI Dual supply low voltage processor applications, transient response, a precise voltage reference for set-
such as: P55CT", CYRIX MT”, POWER PCT” and ting the output voltage as well as a direct drive of the
AMD k6TU MOSFET for the minimum part count.
El Simple 5V to 3.3V switcher for Pentium with AGP
or Pentium ||TM applications
TYPICAL APPLICATION
J: I CB
C8 ss CS+ CS-
- Drv IRU3034 Gnd
V12 VFB WYST
12V Y-----) ii R8 f R7
5V 1r'1s-i' TIct2, Ct2
r: C1 /\ C2
Figure 1 - Typical application of IRU3034.
Notes: 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 (oC) 8-PIN PLASTIC SOIC (S)
0 To 70 IRU3034CS
Rev. 2.1 1
07l17l02
International
IRU3034 TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
V12 Supply Voltages _................................................. 20V
Fb Pin Voltages _........................................................ -0.3V To 5V
Storage Temperature Range ....................................... -65 To 150°C
Operating Junction Temperature ................................. 0 To 150°C
PACKAGE INFORMATION
8-PIN PLASTIC SOIC (S)
TOPVIEVV
Drv E El ss
V12 E El CS+
VFB E El CS-
\/HYST E El Grad
GJA =160°CIVV
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, the following specification applies over V12=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
Fb Voltage Initial Accuracy VFB 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 IFB VFB=1.25V -1 +1 wA
Minimum On Time VFB is sq wave with 300ns on 800 ns
time and 2ws offtime
Minimum Off Time VFB is sq wave with 300ns off 800 ns
time and 2ws on time
VHYST Pin Output-HI lsouRcs=500wA, VFB=1.5V 11 V
VHYST Pin Output-LO ISINFSOOMA, VFB=1V 1 V
Supply Current |12(st) VFB=1V 10 mA
Maximum Duty Cycle DMAX VFB=1V 100 %
Minimum Duty Cycle DMIN VFB=1.5V 0 %
Gate Drive Rise/Fall Time VGATE Load=|RL3303 70 ns
CL Threshold Current ICL CS+, CS- from 1.3V to 3.7V 20 wA
CS Comp Common Mode Vcs+=Vcs- 0 4.5 V
Soft-Start Current 10 wA
2 Rev. 2.1
07/17/02
