iru3046 International Rectifier Corp., iru3046 Datasheet
iru3046
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iru3046 Summary of contents
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... OUT2 PGood Figure 1 - Typical application of IRU3046 configured as 2-phase converter with current sharing. PACKAGE ORDER INFORMATION T (°C) DEVICE IRU3046CF Rev. 1.9 09/27/02 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 ...
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... IRU3046 ABSOLUTE MAXIMUM RATINGS Vcc Supply Voltage .................................................. 25V VccLDO, VcH1, VcH2 and V Supply Voltage ........... CL Storage Temperature Range ...................................... -65°C To 150°C Operating Junction Temperature Range ..................... PACKAGE INFORMATION 24-PIN PLASTIC TSSOP (F) TOP VIEW = 84 C/W V Gnd REF Vp2 PGood 2 23 Fb2 SEN33 ...
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... Fb2 to V OS(ERR)2 P2 Freq Rt=Open Rt=Gnd V RAMP Tr C =1500pF =1500pF Fb=1V, Freq=200KHz ON T Fb=1.5V OFF I LDO LDO FB I LDO(BIAS) www.irf.com IRU3046 MIN TYP MAX UNITS 0 REF 1 REF 0 REF 1 REF 0 REF 1 REF 4 ...
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... S Q Ramp1 Set1 R Reset Dom Two Phase Oscillator Ramp2 Set2 S PWM Comp2 Q Error Amp2 R Reset Dom 0.5V POR Fb1 PGood Fb2 Fb3 40mA LDO Controller Figure 2 - Block diagram of the IRU3046. www.irf.com VcH1 16 HDrv1 LDrv1 SS>2V 9 VcH2 10 HDrv2 LDrv2 11 PGnd 12 PGood 23 VccLDO ...
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... During shutdown the MOSFET drivers and the LDO controller turn off. Power Good The IRU3046 provides a power good signal. This is an open collector output and it is pulled low if the output voltages are not within the specified threshold. This pin can be left floating if not used ...
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... OUT1 REF R 5 When an external resistor divider is connected to the output as shown in Figure 3. IRU3046 Fb1 Figure 3 - Typical application of the IRU3046 for programming the output voltage. Equation (1) can be rewritten as OUT1 REF This will result to ...
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... The conduction loss is defined as (Upper Switch COND LOAD 2 P (Lower Switch COND LOAD Temperature Dependency DS(ON) The total conduction loss is defined as (Upper Switch CON(TOTAL) CON www.irf.com IRU3046 V 1 OUT ; ---(6) S =2.18mH 1 =2.7mH 2 ), DSS ), maximum output cur ...
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... IRU3046 The R temperature dependency should be consid- DS(ON) ered for the worst case operation. This is typically given in the MOSFET data sheet. Ensure that the conduction losses and switching losses do not exceed the package ratings or violate the overall thermal budget. Choose IRF7460 for control MOSFET and IRF7457 for synchronous MOSFET ...
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... Choose: C ---(11) One more capacitor is sometimes added in parallel with C and R . This introduces one more pole which is mainly 9 4 used to suppress the switching noise. The additional pole is given by www.irf.com IRU3046 and F [ (1/5 ~ 1/10 ESR ...
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... IRU3046 The pole sets to one half of switching frequency which results in the capacitor C POLE POLE For F << For a general solution for unconditionally stability for any type of output capacitors wide range of ESR values we should implement local feedback with a compensa- tion network ...
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... RC circuit as shown in Figure 8: Ve(s) D( Figure 8 - The PI compensation network The loop gain function is: H(s)=[G( H(s)= Select a zero crossover frequency (F switching frequency 20KHz O2 www.irf.com IRU3046 ( OUT = ---(17 OSC ( ) ( ) ---(18 ...
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... OUT2 V = 1.25V REF R = 1KV 10 Results to R =1KV 7 IRU3046 Fb3 Figure 9 - Programming the output voltage for LDO. 12 LDO Power MOSFET Selection =1 ---(19) 3V The first step in selecting the power MOSFET for the OSC linear regulator is to select the maximum R on the input to the dropout voltage and the maximum load current ...
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... R1 2. 47uF 22K 2200pF R4 C9 25K 1500pF PGood C10 0.1uF Figure 10 - Typical application for IRU3046 configured as two independent controllers. 400 370 340 310 280 250 220 190 0 Figure 11 - Switching frequency per phase vs. Rt Rev. 1.9 09/27/02 C2 33uF C13 V VcH1 VcH2 C L ...
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... Q1 C6 IRLR2703 47uF R1 1.8V 442 @ 47uF R3 C8 16.2K 3900pF R4 C9 10K 5600pF PGood C10 0.1uF Figure 12 - Typical application for IRU3046 configured for DDR memory application. 14 C13 1uF V VcH1 VcH2 CL HDrv1 Vcc 1 BAT54A VccLDO LDrv1 V SEN33 V OUT3 PGnd U1 Fb1 Fb3 IRU3046 ...
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... C30 C18 1K 1uF 47uF Rt Sync R16 C24 R13 Comp1 2200pF 15K 29.4K R21 C34 Comp2 6.8nF 16.5K PGood PGood SS C29 0.1uF Figure 13 - Demo-board application of IRU3046. Rev. 1.9 09/27/ 33uF 1uH D1 BAT54S C3 C4 47uF 0.1uF C32 47uF C9 1uF HDrv1 IRF7460 D2 BAT54A ...
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... R21 Resistor 16.5K R5,R19 Resistor 4.7V R8 Resistor 200, 1% R7,10,12 Resistor 1K, 1% R3,R17 Resistor 5mV, 1W, 1% R13 Resistor 15K R6 Resistor 10V 16 Value Qty Part# 2 IRF7460 2 IRF7457 1 IRLR2703 1 IRU3046 1 BAT54S 2 BAT54A or 1N4148 2 D03316P-102 1 D05022P-222HC 1 D05022P-332HC 2 ECS-T1CD336R 2 16TPB47M 2 6TPB330M 6 6TPC150M 2 ECJ-2VF1E104Z 1 ECJ-3YB1E105K 1 ECJ-2VB1H222K 1 ECJ-2VB1H682K 2 ECJ-2VC1H471J 6 ECJ-2VF1C105Z 2 ECS-T1AD476R ...
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... Rev. 1.9 09/27/02 Figure 15 - Inductors current matching. Ch1: Gate signal for sync FET(master) (10V/div). Ch2: Gate signal for sync FET(slave) (10V/div). Ch3: Inductor current for master channel (5A/div). Ch4: Inductor current for slave channel (5A/div). V =5V, V =12V, I MASTER SLAVE www.irf.com IRU3046 =10A OUT 17 ...
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... IRU3046 WAVEFORMS V =5V IN Vss V OUT Figure 17 - Start- OUT IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 18 = 10A. Figure 18 - Transient response @ Figure 19 - Transient response for LDO @ 2A. OUT Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01 www ...
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... NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. Rev. 1.9 09/27/02 (F) TSSOP Package 24-Pin 24-PIN SYMBOL MIN NOM MAX DESIG 0.65 BSC A 4.30 4.40 4. 6.40 BSC 0.19 --- 0.30 D 1.00 E 1.00 F 7.70 7.80 7.90 G --- --- 1.10 H 0.85 0.90 0.95 J 0.05 --- 0. 128 REF M 128 REF 08 --- 88 N 1.00 REF O 0.50 0.60 0.75 P 0.20 Q 0.09 --- --- R 0.09 --- --- R1 www.irf.com IRU3046 DETAIL A DETAIL A 19 ...
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... IRU3046 PACKAGE SHIPMENT METHOD PKG PACKAGE DESIG DESCRIPTION F TSSOP Plastic IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 20 PIN PARTS COUNT PER TUBE Feed Direction Figure A Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01 www ...