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IRU3146CFTR
Dual Synchronous PWM Controller with Current Sharing Circuitry and Auto-Restart
NOT RECOMMENDED FOR NEW DESIGN Data Sheet No.PD 94702 revA
Des1nkeiogi'i'ndation IRU 31 46
DUAL SYNCHRONOUS PWM CONTROLLER WITH
CURRENT SHARING CIRCUITRYAND AUTO-RESTART
International
TOR Rectifier
FEATU RES
:1 Dual Synchronous Controller with 180° out-of-phase
rsConfigurable to 2-Independent Outputs or 2-Phase
Single Output
:1 Current Sharing Using Inductor's DCR
a Current Limit using MOSFET's Rosm)
nHiccup/Latched Current Limit
ll Latched Over-Voltage Protection
chc from 4.5V to 16V Input
ll Programmable Switching Frequency up to 500KHz
a Two Independent Soft-Starts/ Shutdowns
II 0.8V Precision Reference VoltageAvailable
ll Power Good Output
" External Frequency Synchronization
APPLICATIONS
nEmbedded Computer Systems
uTelecom Systems
El Point of Load Power Architectures
DESCRIPTION
The IRU3146 IC combines a Dual synchronous Buck
controller, providing a cost-effective, high performance
and flexible solution. The IRU3146 can configured as 2-
independent or as 2-phase controller. The 2-phase con-
figuration is ideal for high current applications. The
IRU3146 features 180° out of phase operation which re-
duces the required input/output capacitance and results
to few number of capacitor quantity. Other key features
offered by this device include two independent program-
mable soft starts, programmable switching frequency up
to 500KHz per phase, under voltage lockout function.
The current limit is provided by sensing the lower
MOSFET's on-resistance for optimum cost and perfor-
mance.
rg2-Phase Power Supply
"Graphic Card
uDDR Memory Applications
c12_J_
03L c4-IC- -Cl_c13
I I VCL VCH1 VOUT3 1/dH2 I ’_l
T T Vcc HDrv1 T 'm
cs-L R1 =
I OCSet1
T . LDrv1 L-
Hiccup ll',
_ Sync PGnd1 -
VP2 r-------
- VREF I , D2
BAT54A
R2 Rt U1 l I
IRU3146 VSEN1 j --
C8 E, Comp1 WEN - LC_;
rt/cc, R9 €28
C9 R4 J CTI -
W Comp2 I 7 C18 -
_ FOM R6 It] Q4 L4
OCSetZ -NVV- v , V , V I
Poem PGood_ LEM Q5
cw-fr" SSI/ID PGnd2
3:: - SS2 / SD Gnd -T1 -
Figure 1 - Typical application of IRU3146 in 2-phase configuration with inductor current sensing
PACKAGE ORDER INFORMATION
DEVICE
PACKAGE
IRU3146CF
28-Pin TSSOP (F)
Rev. 1.1
6/25/04
ABSOLUTE MAXIMUM RATINGS
Vcc, Vcr, Supply Voltage .............................................. -0.5V To 16V
VcH1 and VcH2 Supply Voltage ................................ -0.5V To 25V
PGOOD _................................................................... -0.5V To 16V
Storage Temperature Range ...................................... -40°C To 125°C
Operating Junction Temperature Range .....................
Caution: Stresses above those listed in Absolute Maximum Ratings" may cause permanent damage to the device.
PACKAGE INFORMATION
-40°C To 125°C
28-Pl N TSSOP (F)
PGoodII O E Gnd
VchZ El VREF
VOUT3E E VP2
Rt IE El Hiccup
VSEN2E El Sync
Fb2 E El VSEN1
Comp2 I: Ea] Fb1
SS2 / s7 IE El Comp1
ocset2IE Eiss1 / s7
vcH211Co El OCSet1
HDrv21C1 EIVcH1
PGndZIE E HDrv1
LszE E PGnd1
vCLE El LDrv1
(LA = 84°CNV
International
TOR Rectifier
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Vcc=12V, VCH1=VCH2=VCL=12V and TA=0 to 70°C.
Typical values refer to TA=25°C. Lowduty cycle pulse testing is used which keepsjunction and case temperatures
equal to the ambient temperature.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage Section
Reference Voltage VREF 0.789 0.805 0.821 V
Voltage Line Regulation LREG 5
UVLO Section
UVLO Threshold - Vcc UVLOch Supply Ramping Up 3.9 4.2 4.5 V
UVLO Hysteresis - Vcc Ramp Up and Ramp Down 0.25 V
UVLO Threshold - VcH1 UVLOVCH1 Supply Ramping Up 3.2 3.5 3.8 V
UVLO Hysteresis - VcH1 Ramp Up and Ramp Down 0.1 V
UVLO Threshold - VcH2 UVLOVCHZ Supply Ramping Up 3.2 3.5 3.8 V
UVLO Hysteresis - VcH2 Ramp Up and Ramp Down 0.1 V
Supply Current Section
Vcc Dynamic Supply Current Dyn Icc Freq=300KHz, CL=1500pF 10 15 mA
VcH1 & VcH2 Dynamic Current Dyn ICH Freq=300KHz, CL=1500pF 15 25 mA
VCL Dynamic Supply Current Dyn ICL Freq=300KHz, CL=1500pF 15 25 mA
Vcc Static Supply Current loco SS=0V 10 15 mA
VcH1NcH2 Static Current ICHQ SS=0V 6 10 mA
VCL Static Supply Current Icm SS=0V 6 10 mA
2 Rev. 1.1
6/25/04
