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IRU3046
DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
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
