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IRU3046CF
Dual Synchronous PWM Controller with Current sharing Circuitry and LDO Controller in a 24-Pin TSSOP package
Data Sheet No. PD94251
IRU3046
International
TOR Rectifier
DUAL SYNCHRONOUS PWM CONTROLLER WITH
CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
PRELIMINARY DATA SHEET
DESCRIPTION
The IRU3046 IC combines a Dual synchronous Buck
controller and a linear regulator controller, providing a
FEATU RES
EI Dual Synchronous Controller in 24-Pin Package
with 180° out-of-phase operation
EI LDO Controller with Independent Bias Supply cost-effective, high performance and flexible solution for
Cl Can be configured as 2-lndependent or 2-Phase multi-output applications. The Dual synchronous con-
PWM Controller troller can be configured as 2-independent or 2-phase
ty Programmable Current Sharing in 2-Phase CoMgu- controller. In 2-phase configuration, the IRU3046 provides
ration a programmable current sharing which is ideal when the
D Flexible, Same or Separate Supply Operation output power exceeds any single input power budget.
I: Operation from 4V to 25V Input IRU3046 provides a separate adjustable output by driv-
El Programmable Switching Frequency up to 4OOKHz ing a switch as a linear regulator. This device features
El Soft-Start controls all outputs programmable switching frequency up to 400KHz per
I: Precision Reference Voltage Available phase, under-voltage lockout for all input supplies, an
E 500mA Peak Output Drive Capability external programmable soft-start function as well as out-
D Short Circuit Protection for all outputs put under-voltage detection that latches off the device
D Power Good Output when an output short is detected.
D Synchronizable with External Clock
APPLICATIONS
El Dual-Phase Power Supply
El DDR Memory Source Sink Vtt Application
D Graphic Card
D Hard Disk Drive
D Power supplies requiring multiple outputs
TYPICAL APPLICATION D1 D2
12V L1 LL 't"-
w Th; _L T C12 ILS __c11
CI C2 ed. cr- 'Cyc1:, l T
T I I I va. VcH1 VCH2 I h
- - T -- T I Q2 C14
_LCS Vcc HDN1 I IT; L3 R5
CL. VccLDO LD 1 I C13 C15
3.3V - - - Vsam N l
06% 01:} Voum 'i gee
- R1 U1 PGnd -,k,-
Vourz’ ttt - Fb3 l/REF-
:_C7 ' - Rt |RU3046 Vp2
- Sync Fb1
Cl: == Ic-l-, ARA3»_ Comp1 W
Ic'-'v'h- Comp2 HDrv2
PGood\ PGood LDNZ
[C__" ss
C10 Gm
Figure 1 - Typical application of IRU3046 configured as 2-phase converter with current sharing.
PACKAGE ORDER INFORMATION
TA (°C)
DEVICE
PACKAGE
FREQUENCY
0T0 70
IRU3046CF
24-Pin Plastic TSSOP (F)
200-400KHz
Rev. 1.9
09/27/02
IRU3046
International
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage ..................................................
VchDO, VcH1, VcH2 and Vcr, Supply Voltage ...........
Storage Temperature Range ......................................
-65°C To 150°C
30V (not rated for inductive load)
Operating Junction Temperature Range ..................... 0°C To 125°C
PACKAGE INFORMATION
24-PIN PLASTIC TSSOP (F)
TOP VIEW
VREFE 0 36nd (LA = 84°CNV
Vp2lZ EslraGood
M E EvSam
VccE Lol Fbl
Comp1 E E ss
Comp2 E Cs] Phi)
ME Evans
SynaE chcLDO
VcHzE Ech
HDer [E EHDm
LDrv2 [E 2] LDrv1
PGndIE Elva.
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Vcc=5V, VCH1=VCH2=VCL=VCCLDO=12V and TA=0 to
70°C. Typical values refer to TA=25°C. Low duty cycle pulse testing is used which keeps junction and case tem-
peratures equal to the ambient temperature.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage Section
Fb Voltage I/rss 1.225 1.250 1.275 V
Fb Voltage Line Regulation LREG 5
UVLO Section
UVLO Threshold - Vcc UVLOVcc Supply Ramping Up 4.2 V
UVLO Hysteresis - Vcc 0.25 V
UVLO Threshold - VchDO UVLOVchDO Supply Ramping Up 4.2 V
UVLO Hysteresis - VccLDO 0.25 V
UVLO Threshold - VcH1 UVLOVcH1 Supply Ramping Up 3.5 V
UVLO Hysteresis - VcH1 0.2 V
UVLO Threshold - VcH2 UVLOVcH2 Supply Ramping Up 3.5 V
UVLO Hysteresis - VcH2 0.2 V
UVLO Threshold - Fb UVLOFb Fb Ramping Down 0.6 V
UVLO Hysteresis - Fb 0.1 V
UVLO Threshold - VSEN33 UVLOVSEN33 Supply Ramping Up 2.5 V
UVLO Hysteresis - VSEN33 0.2 V
Supply Current Section
Vcc Dynamic Supply Current Dyn Icc Freq=200KHz, CL=1500pF 5 mA
VcH1 Dynamic Supply Current Dyn lcH1 Freq=200KHz, CL=1500pF 7 mA
VcH2 Dynamic Supply Current Dyn lcH2 Freq=200KHz, CL=1500pF 7 mA
Vcc Static Supply Current loco SS=0V 3.5 mA
VcH1 Static Supply Current IcH1Q SS=0V 2 mA
VcH2 Static Supply Current lcH2Q SS=OV 2 mA
VchDO Static Supply Current IcLDO SS=0V 1 mA
Rev. 1.9
09/27/02
