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Details, datasheet, quote on part number:IRDC3046
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| Part: | IRDC3046 |
| Description: | Reference Design Kit Featuring Dual Synchronous PWM Controller With Current Sharing Circuitry And LDO Controller |
| Company: | International Rectifier Corp. |
| Datasheet: | Download IRDC3046 datasheet File size : 167 kB |
| Request For quote: | Find where to buy IRDC3046
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Datasheet text preview:
Data Sheet No. PD94251
IRU3046
DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
PRELIMINARY DATA SHEET
FEATURES
Dual Synchronous Controller in 24-Pin Package with 1808 out-of-phase operation LDO Controller with Independent Bias Supply Can be configured as 2-Independent or 2-Phase PWM Controller Programmable Current Sharing in 2-Phase Configuration Flexible, Same or Separate Supply Operation Operation from 4V to 25V Input Programmable Switching Frequency up to 400KHz Soft-Start controls all outputs Precision Reference Voltage Available 500mA Peak Output Drive Capability Short Circuit Protection for all outputs Power Good Output Synchronizable with External Clock
DESCRIPTION
The IRU3046 IC combines a Dual synchronous Buck controller and a linear regulator controller, providing a cost-effective, high performance and flexible solution for multi-output applications. The Dual synchronous controller can be configured as 2-independent or 2-phase controller. In 2-phase configuration, the IRU3046 provides a programmable current sharing which is ideal when the output power exceeds any single input power budget. IRU3046 provides a separate adjustable output by driving a switch as a linear regulator. This device features programmable switching frequency up to 400KHz per phase, under-voltage lockout for all input supplies, an external programmable soft-start function as well as output under-voltage detection that latches off the device when an output short is detected. Graphic Card Hard Disk Drive Power supplies requiring multiple outputs
APPLICATIONS
Dual-Phase Power Supply DDR Memory Source Sink Vtt Application
TYPICAL APPLICATION
12V 5V C1 C2 C3 C4 VCL C5 3.3V C6 VOUT2 Q1 R1 C7 R2 C8 C9 R3 R4 Vcc VccLDO V SEN33 V OUT3 Fb3 IRU3046 Rt Sync Comp1 Comp2 VcH1 VcH2 HDrv1 Q2 C13 L1 C12 L2
D1
D2
C11
C14
L3
R5 VOUT1 C16
LDrv1
Q3
C15 R6
U1
PGnd V REF Vp2 Fb1 Fb2 Q4 C17 L4
R7
R8
HDrv2
R9
PGood C10
PGood SS
LDrv2 Gnd
Q5
C18 R10
Figure 1 - Typical application of IRU3046 configured as 2-phase converter with current sharing.
PACKAGE ORDER INFORMATION
TA (°C) 0 To 70
Rev. 1.9 09/27/02
DEVICE IRU3046CF
PACKAGE 24-Pin Plastic TSSOP (F) www.irf.com
FREQUENCY 200-400KHz
1
IRU3046
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage ........ VccLDO, VcH1, VcH2 and VCL Supply Voltage .. Storage Temperature Range ..... Operating Junction Temperature Range ............ 25V 30V (not rated for inductive load) -65°C To 150°C 0°C To 125°C
PACKAGE INFORMATION
24-PIN PLASTIC TSSOP (F)
TOP VIEW
VREF 1 Vp2 2 Fb2 3 Vcc 4 Comp1 5 Comp2 6 Rt 7 Sync 8 VcH2 9 HDrv2 10 LDrv2 11 PGnd 12
24 G n d 23 PGood 22 VSEN33 21 Fb1 20 SS 19 Fb3 18 VOUT3 17 VccLDO 16 VcH1 15 HDrv1 14 LDrv1 13 VCL
JA = 84°C/W
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 temperatures equal to the ambient temperature. PARAMETER Reference Voltage Section Fb Voltage Fb Voltage Line Regulation UVLO Section UVLO Threshold - Vcc UVLO Hysteresis - Vcc UVLO Threshold - VccLDO UVLO Hysteresis - VccLDO UVLO Threshold - VcH1 UVLO Hysteresis - VcH1 UVLO Threshold - VcH2 UVLO Hysteresis - VcH2 UVLO Threshold - Fb UVLO Hysteresis - Fb UVLO Threshold - VSEN33 UVLO Hysteresis - VSEN33 Supply Current Section Vcc Dynamic Supply Current VcH1 Dynamic Supply Current VcH2 Dynamic Supply Current Vcc Static Supply Current VcH1 Static Supply Current VcH2 Static Supply Current VccLDO Static Supply Current SYM VFB LREG TEST CONDITION MIN 1.225 TYP 1.250 0.2 4.2 0.25 4.2 0.25 3.5 0.2 3.5 0.2 0.6 0.1 2.5 0.2 5 7 7 3.5 2 2 1 MAX UNITS 1.275 V % V V V V V V V V V V V V mA mA mA mA mA mA mA
Rev. 1.9 09/27/02
5UVLOV CC Supply Ramping Up UVLOV CCLDO Supply Ramping Up UVLOV CH1 Supply Ramping Up UVLOV CH2 Supply Ramping Up UVLOFb Fb Ramping Down
UVLOV SEN33 Supply Ramping Up Dyn ICC Dyn ICH1 Dyn ICH2 ICCQ ICH1Q ICH2Q ICLDO Freq=200KHz, CL=1500pF Freq=200KHz, CL=1500pF Freq=200KHz, CL=1500pF SS=0V SS=0V SS=0V SS=0V www.irf.com
2
IRU3046
PARAMETER Soft-Start Section Charge Current Power Good Section Fb1 Lower Trip Point Fb1 Upper Trip Point Fb2 Lower Trip Point Fb2 Upper Trip Point Fb3 Lower Trip Point Fb3 Upper Trip Point Power Good Voltage OK Error Amp Section Fb Voltage Input Bias Current Fb Voltage Input Bias Current Transconductance 1 Transconductance 2 Input Offset Voltage for PWM2 Oscillator Section Frequency Ramp Amplitude Output Drivers Section Rise Time Fall Time Dead Band Time Max Duty Cycle Min Duty Cycle LDO Controller Section Drive Current Fb Voltage Input Bias Current SYM SSIB PGFB1L PGFB1H PGFB2L PGFB2H PGFB3L PGFB3H VPG IFB1 IFB2 gm 1 gm 2 TEST CONDITION SS=0V Fb1 Ramping Down Fb1 Ramping Up Fb2 Ramping Down Fb2 Ramping Up Fb3 Ramping Down Fb3 Ramping Up 5K resistor pulled up to 5V SS=3V SS=0V Fb2 to VP2 Rt=Open Rt=Gnd CL=1500pF CL=1500pF Fb=1V, Freq=200KHz Fb=1.5V -2 180 300 MIN 15 TYP 25 0.9V REF 1.1V REF 0.9V REF 1.1V REF 0.9V REF 1.1V REF 4.8 -0.1 -64 400 600 0 200 350 1.25 35 50 150 90 0 45 1.25 0.5 MAX 30 UNITS mA V V V V V V V mA mA m mho m mho mV KHz V ns ns ns % % mA V mA
4.5
5
V OS(ERR)2 Freq V RAMP Tr Tf TD B TON TOFF ILDO VFBLDO ILDO(BIAS)
+2 220 450 100 100 250
50 85 0 30 1.225
1.275 2
PIN DESCRIPTIONS
PIN# 1 2 3 21 4 5,6 7 8 9 16 PIN DESCRIPTION Reference Voltage. Non-inverting input to the second error amplifier. In the current sharing mode, it is connected to the programming resistor. In independent 2-channel mode it is connected to VREF pin when Fb2 is connected to the resistor divider to set the output voltage. Fb2 Inverting inputs to the error amplifiers. In current sharing mode, Fb1 is connected to a Fb1 resistor divider to set the output voltage and Fb2 is connected to programming resistor to achieve current sharing. In independent 2-channel mode, these pins work as feedback inputs for each channel. Vcc Supply voltage for the internal blocks of the IC. Comp1, Comp2 Compensation pins for the error amplifiers. Rt The switching frequency can be programmed between 200KHz and 400KHz by connecting a resistor between Rt and Gnd. By floating the pin, the switching frequency will be 200KHz and by grounding the pin, the switching frequency will be 400KHz. Sync The internal oscillator may be synchronized to an external clock via this pin. VcH2 Supply voltage for the high side output drivers. These are connected to voltages that must VcH1 be at least 4V higher than their bus voltages (assuming 5V threshold MOSFET). A minimum of 1mF, high frequency capacitor must be connected from these pins to PGnd to provide peak drive current capability. www.irf.com PIN SYMBOL VREF Vp2
Rev. 1.9 09/27/02
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