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IRU3047CWIRN/a1500avaiDual Synchronous PWM Controller with Current Sharing Circuitry and a LDO Controller in a 20-Pin SOIC(WB) package
IRU3047CWIORN/a1600avaiDual Synchronous PWM Controller with Current Sharing Circuitry and a LDO Controller in a 20-Pin SOIC(WB) package
IRU3047CWTRIRN/a62000avaiDual Synchronous PWM Controller with Current Sharing Circuitry and a LDO Controller in a 20-Pin SOIC(WB) package


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IRU3047CW-IRU3047CWTR
Dual Synchronous PWM Controller with Current Sharing Circuitry and a LDO Controller in a 20-Pin SOIC(WB) package
International
TOR Recli
FEATU RES
Data Sheet No. PD94252
IRU3047
DUAL SYNCHRONOUS PWM CONTROLLER WITH
CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
Dual Synchronous Controller in 20-Pin Package
with 180° out-of-phase operation
PRELIMINARY DATA SHEET
DESCRIPTION
The IRU3047 IC combines a Dual synchronous Buck
controller and a linear regulator controller, providing a
El LDO Controller with 40mA drive cost-effective, high performance and flexible solution for
D 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
ta Programmable Current Sharing in 2-Phase CoMgu- controller. In 2-phase configuration, the IRU3047 provides
ration a programmable current sharing which is ideal when the
El Flexible, Same or Separate Supply Operation output power exceeds any single input power budget.
El Operation from 4V to 25V Input IRU3047 provides a separate adjustable output by driv-
D Internal 200KHz Oscillator per phase ing a switch as a linear regulator. This device features an
D Soft-Start controls all outputs internal 200KHz oscillator, under-voltage lockout for all
D Fixed Frequency Voltage Mode input supplies, an external programmable soft-start func-
D 500mA Peak Output Drive Capability tion as well as output under-voltage detection that latches
E Short Circuit Protection for All Outputs off the device when an output short is detected.
El Power Good Output
APPLICATIONS
El Dual-Phase Power Supply
D DDR Memory Source Sink Vtt Application
D Graphic Card
I: Hard Disk Drive
I: Power supplies requiring multiple outputs
TYPICAL APPLICATION DI D2
12V L J92 - 'r"-
W , I "m T Ir-a cr-
oc'. “i ci cr- "s-uc,} T
T T I I va, VcH1 VcH2 I n“
_ _ 1 T HDrv1 T I 02 Crt
J_CS Vcc
"ttT-o. T LDrv1
cs Q1 Fil voura
cc -"R, PGnd
vourz trt - U1 VREF
__c7 ' IRU3047 m
Cl ca R3 Fb1
r --- F-l-OR-compo m
Ic-CR/lr- Comp2 HDrv2
PGood PGood LDer
Icm Gm
Figure 1 - Typical application of IRU3047 configured as 2-phase converter.
PACKAGE ORDER INFORMATION
TA (°C) DEVICE PACKAGE
0 To 70 IRU3047CW 20-Pin Plastic SOIC (W)
Rev. 1.0
09/09/02
IRU3047
International
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage ..................................................
VcH1, VcH2 and VCL Supply Voltage ...........................
Storage Temperature Range ......................................
Operating Junction Temperature Range .....................
-65°C To 150°C
0°C To 125°C
30V (not rated for inductive load)
PACKAGE INFORMATION
20-PIN PLASTIC SOIC WB (W)
TOPVIEW
VREFE U 20 Gnd
Vp2 E 19 PGood
FbZE EFM
VccE 17 ss
Comp1E 16 Fb3
CompZE EVOUTIS
VcH2 E Ech
HDrv2 E 13 HDrv1
LDrv2 IE 12 LDrv1
PGnd IE EVCL
0JA=75°CIW
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Vcc=5V, VCH1=VCH2=VCL=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 temperatures
equal to the ambient temperature.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage Section
Fb Voltage VFB 1.225 1.250 1.275 V
Fb Voltage Line Regulation LREG 5UVLO Section
UVLO Threshold - Vcc UVLOVcc Supply Ramping Up 4.2 V
UVLO Hysteresis - Vcc 0.25 V
UVLO Threshold - VchDO UVLCh/cct.1xy Supply Ramping Up 4.2 V
UVLO Hysteresis - VchDO 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
Supply Current Section
Vcc Dynamic Supply Current Dyn loo Freq=200KHz, CL=1500pF 5 mA
VcH1 Dynamic Supply Current Dyn lcH1 Freq=200KHz, CL=1500pF 7 mA
VcH2 Dynamic Supply Current Dyn IcH2 Freq=200KHz, CL=1500pF 7 mA
Vcc Static Supply Current loco SS=0V 3.5 mA
VcH1 Static Supply Current lcHIQ SS=0V 2 mA
VcH2 Static Supply Current IcH2Q SS=0V 2 mA
Rev. 1.0
09/09/02
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