SWITCHER LINEAR CONTROLLER FEATURES Controller allows cost pass t

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SWITCHER LINEAR CONTROLLER FEATURES Controller allows cost pass t

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IRU3033
SWITCHER LINEAR CONTROLLER FEATURES
Controller allows cost pass transistor supply 8-pin SOIC combines switching linear controller Internal pre-regulator eliminates cross talk between switching linear regulators Automatic shut down linear regulator when connected Vcc2 detect On-board MOSFET driver Fastest transient response controller method. 100% Duty Cycle 100nS internal voltage reference Internal undervoltage lockout protects MOSFET during start-up
IRU3033 combines switching controller linear regulator controller compact 8-pin surface mount package, providing total solution dual supply processor applications such Intel P55C, well Cyrix 6X86Land M2processors. Typically these applications dual supply regulator converts 3.3V supply jumper programmable supply 1.25V 3.5V CORE supply. linear regulator controller portion IRU3033 programmable controller allowing flexibility regulator minimum 50mA drive current capability designed provide ample current external pass transistor. uses internal regulator generated from supply power controller well supply drive power MOSFET, allowing cost N-channel MOSFET switch used. also includes error comparator fast transient response, precise voltage reference setting output voltage well direct drive MOSFET minimum part count.
APPLICATIONS
Dual supply voltage processor applications, such P55C, CYRIX POWER PCand K6Simple 3.3V switcher Pentium with Pentium IIapplications
TYPICAL APPLICATION
Drv2 Vfb2
Vcc2
IRU3033
Drv1V12swVfb1 Vhyst
Core
3033app1-1.1
Typical application IRU3033 flexible mother board designed Intel P55, P54, K6as well Cyrix M1and M2applications
Notes: P54C, P55C, Pentium trademarks Intel Corp. trademarks Corp. Cyrix 6X86L, trademarks Cyrix Corp. Power trademark Corp.
PACKAGE ORDER INFORMATION
(°C)
Rev. 1/14/99
8-PIN PLASTIC SOIC IRU3033CS
4-77
IRU3033
ABSOLUTE MAXIMUM RATINGS
V12,V12SW Supply Voltages Voltages. Storage Temperature Range Operating Junction Temperature -0.3V 150° 150°
PACKAGE INFORMATION
8-PIN PLASTIC SOIC
VIEW
Drv1
Drv2 Vfb2
V12sw Vfb1 Vhyst
=160°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified following specification applies over =V12SW =12V, duty cycle pulse testing used which keeps junction case temperatures equal ambient temperature. Linear Controller Section PARAMETER Voltage Initial Accuracy Voltage Total Variation Voltage Line Regulation Input Bias Current Maximum Drive Current Supply Current VFB2 TEST CONDITION =25°C, Drv2=VFB2, CL=100µF Drv2=VFB2, CL=100µF 10<V12<14V,Drv2=VFB2, CL=100µF VFB2 =1.25V VFB2 =1V, VFB1 =1.5V VFB2 =1V, VFB1 =1.5V, IDRV2 1.237 1.225 1.250 1.250 1.262 1.275 UNITS
IFB2 IDRVMAX
Switching Controller Section PARAMETER Voltage Initial Accuracy VFB1 Voltage Total Variation Voltage Line Regulation Input Bias Current IFB1 Time Time Vhyst output-HI Vhyst output-LO Supply Current Maximum Duty Cycle Minimum Duty Cycle Gate Drive Rise/Fall Time
TEST CONDITION =25°C
1.237 1.225
1.250 1.250
1.262 1.275
I12SW DMAX DMIN VGATE
VFB1 =1.25V VFB1 wave with time time VFB1 wave with time time ISOURCE =500µA, VFB1 =1.5V ISINK =500µA, VFB1 VFB1 =1V, VFB2 =1.5V VFB1 VFB1 =1.5V Load=IRL3303
UNITS
4-78
Rev. 1/14/99
IRU3033
DESCRIPTIONS
SYMBOL DESCRIPTION resistor divider from this output switching regulator ground sets VFB1 Core supply voltage. feedback linear regulator. resistor divider from this output VFB2 linear regulator ground sets supply voltage. drive linear regulator. This controls base transistor gate Drv2 MOSFET acting series pass element linear regulator. This connected substrate must connected lowest potential system. output switching controller. This totem pole drive that conDrv1 nected gate power MOSFET. resistor placed from this gate order reduce switching noise. resistor 10pF capacitor connected from this VFB1 VHYST output ripple voltage switching regulator. This supplies voltage drive hysterises circuitry conV12SW nected supply. 1µF, high frequency capacitor must connected from this ground provide peak current charging discharging MOSFET. This provides biasing chip drive linear regulator controller. connected supply. resistor series from this supply 1µF, high frequency capacitor connected from this required filter switching noise switching regulator.
BLOCK DIAGRAM
V12sw
Vhyst
UVLO Vref Control
3033blk1-1.0
1.25V
Vfb2
Figure Simplified block diagram IRU3033
Rev. 1/14/99
4-79
IRU3033
TYPICAL APPLICATION
Pentium Dual Supply Application
Vcc2
Drv1V12sw Vfb1 Vhyst
Drv2 Vfb2
Core
3033app2-1.3
Figure Typical application IRU3033 flexible motherboard with output voltage selection. This circuit uses single jumper that programs output voltage steps with 0.1V steps from 3.5V, designed Intel P55,P54, K6as well Cyrix M1and M2applications. Vcc2Det automatically shuts down regulator when single plane processor dropped socket.
Output Voltage Jumper block installed. Jumper block installed.
4-80
Rev. 1/14/99
IRU3033
Pentium Dual Supply Application Parts List
Desig Description LDO/Switcher MOSFET MOSFET Diode, Schottky Diode Inductor Inductor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Heat Sink Heat Sink Heat Sink Part IRU3033CS 8-pin SOIC) MTP3055 (TO-220) IRL3303 (TO-220) IRL3103S (TO-263) (note 1N4148 MBR1045CT (TO-220) MBRB1545CT (TO-263) (note1) Core: T50-18, L=4µH Turns: 10T, L=2µH ohm, 1206 size ohm, 1206 size kohm, 0805 size ohm, 0805 size 90.9 kohm, 0805 size 1.24 kohm, 0805 size 2.49 kohm, 0805 size 4.99 kohm, 0805 size kohm, 0805 size 1.30 kohm, 0805 size kohm, 0805 size 1.21 kohm,1%, 0805 size kohm, 0805 size ohm, 0805 size ohm, 0805 size 2.4k ohm, 0805 size 7.5k ohm, 0805 size 6MV1500GX, 1500µF, 6.3V, Elect 6MV1500GX, 1500µF, 6.3V, Elect 1µF, Ceramic, 0805 size 470pF, Ceramic, 0805 size 10pF, Ceramic, 0805 size 6MV1500GX, 1500µF, 6.3V, Elect 6MV1500GX, 1500µF, 6.3V, Elect 1µF, Ceramic, 0805 size 470p, Ceramic, 0805 size MOSFET, 577002 Schottky Diode 577002 507222 (I/O curren<5A) 576602 (I/O current< 3.5A)
parallel combination Note applications where desirable eliminate heat sink, IRL3103S MBR1545CT TO-263 packages with minimum square copper used.
Manuf Motorola
Motorola Micro Metal (core)
Sanyo Sanyo Sanyo Sanyo Sanyo
Aavid Aavid Aavid
Rev. 1/14/99
4-81
IRU3033
TYPICAL APPLICATION
3.3V Pentium Application with Pentium Application without power supply Dual mode Operation between Switching Linear mode.
Drv2 Vfb2
Drv1 V12sw Vfb1 Vhyst
Figure This unique application IRU3033 allows designer switch between Linear Switching mode operation using single This circuit flexibility used current operation Linear mode cost reasons able operate Switching mode load current increases heat generated Linear operation will issue. Table below describes components that will effected modes operation.
Vout
3033app3-1.3
Note applications where desirable eliminate heat sink, IRL3103S MBR1545CT TO-263 packages with minimum square copper used.
Mode Operation Switching Linear
parts list value
Short
Open
Desig C1,2
Description LDO/Switcher MOSFET Schottky Diode Inductor Inductor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Heat Sink
Heat Sink
Part IRU3033CS (8-pin SOIC) IRL3303 (TO-220) IRL3103S (TO-263) (note MBR1045CT (TO-220) MBRB1545CT (TO-263) (note1) Core:T50-18,L=4µH Turns: 10T, L=2µH 2.4k ohm, 1206 size ohm, 1206 size ohm, 1206 size kohm, 0805 size kohm, 0805 size ohm, 0805 size ohm, 0805 size ohm, 0805 size ohm, 1206 size ohm, 1206 size 7.5k ohm, 1206 size 6MV1500GX, 1500µF, 6.3V, Elect 1µF, Ceramic, 0805 size 470pF, Ceramic, 0805 size 10pF, Ceramic, 0805 size 6MV1500GX, 1500uF, 6.3V, Elect 1µF, Ceramic, 0805 size 470pF, Ceramic, 0805 size MOSFET Switching mode, 577002 MOSFET Linear mode: 507222 (3.3V current<5A), 576602 (3.3V current< 3.5A) Schottky Diode, 577002
Manuf
Motorola Micro Metal (core)
Sanyo Sanyo Sanyo Sanyo
Aavid
Aavid
4-82
Rev. 1/14/99
IRU3033
TYPICAL APPLICATION
3.3V Pentium application with Pentium application without power supply switching mode operation
Drv2 Vfb2
Drv1 V12sw Vfb1 Vhyst
Vout
3033app4-1.2
Figure circuit figure application IRU3033 switching mode only. This circuit used generate cost 3.3V either Pentium application with socket Pentium applications where desirable generate accurate board 3.3V supply.
Desig
Description
Part
Manuf
C1,2
LDO/Switcher MOSFET Schottky Diode Inductor Inductor Resistor Resistor Resistor Resistor Resistor Resistor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Heat Sink Heat Sink
IRU3033CS (8-pin SOIC) IRL3303 (TO-220) IRL3103S (TO-263) (note MBR1045CT (TO-220) MBRB1545CT (TO-263) (note1) Core: T50-18,L=4µH Turns: 10T, L=2µH ohm, 1206 size ohm,5%, 0805 size ohm, 1206 size kohm, 0805 size kohm, 0805 size ohm, 0805 size 6MV1500GX, 1500µF, 6.3V, Elect 1µF, Ceramic, 0805 size 470pF, Ceramic, 0805 size 10pF, Ceramic, 0805 size 6MV1500GX, 1500µF, 6.3V, Elect 1µF, Ceramic, 0805 size MOSFET, 577002 Schottky Diode, 577002
Motorola Micro Metal (core)
Sanyo Sanyo Sanyo Sanyo Aavid Aavid
Note applications where desirable eliminate heat sink, IRL3103S MBR1545CT TO-263 packages with minimum square copper used.
Rev. 1/14/99
4-83
IRU3033
APPLICATION INFORMATION
Introduction IRU3033 device application specific product designed provide onboard dual supply generation microprocessors requiring separate Core supplies. processors fitting this requirement Intel P55Cmultimedia microprocessor. Intel specifies Core voltage 2.8V nominal (±100mV max) with maximum Core supply current while supply 3.3V with maximum current 0.65A. However, most applications regulator also provides voltage other functions such chipset, cache, etc. Typically cost solution such Dropout (LDO) Linear Regulator selected provide supply with maximum designed current keeping power dissipation heat sink reasonable size. Core supply regulator, however, also selected linear regulator, will dissipating maximum 12.6W [(5V2.8V)X5.7A] power, which requires substantial amount heat sinking perhaps forced cooling order keep operational. Some manufacturers suggest using regulators current share therefore distribute power dissipation equally between regulators. problem that, order equally current share need sense both currents force slave regulator match master regulator. This done, cost circuit complexity much higher system cost total power dissipation still same. fact, task design flexible motherboard accommodate Cyrix 6X86L their future processors, then power dissipation could easily reach more. this power dissipation level choice switching regulator approach becomes evident. However, main reason that designers have always shied away from switching regulators their higher price more complex circuit design that associated with this kind technique. IRU3033 device designed take advantage high efficiency switching regulator technique Core supply while maintaining cost regulator supply offering both control functions single 8-pin surface mount package. fact typical application circuit shows, design complete flexible motherboard using IRU3033 external components yielding very component count switching regulator with addition cost pass transistor supply provide complete dual supply power solution. Section output voltage regulator externally programmable external resistors from 1.25V internal voltage reference regulator 1.25V output regulator programmed using following formula: Vout=(1+R1/R2)xVref Where Vref=1.25V Typical R1=Resistor connected from Vout Vfb2 IRU3033 R2=Resistor connected from Vfb2 GND. IRU3033 requires output capacitor part frequency compensation order stable. Typical designs microprocessor applications standard electrolytic capacitors with typical range 100m output capacitance 1000µF. Fortunately capacitance increases, decreases resulting fixed time constant. IRU3033 takes advantage this phenomena making overall regulator loop stable. most applications minimum 100µF aluminum electrolytic capacitor such Sanyo, MVGX series, Panasonic series Nichicon series insures both stability good transient response. external filtering suggested shown application circuit that reduces switching ripple that might show output regulator. Switching Controller Operation operation switching controller follows: After power applied, output drive, "Drv1" goes 100% duty cycle current inductor charges output capacitor causing output voltage increase. When output reaches pre-programmed point feedback "Fb1" exceeds 1.25V causing output drive switch "Vhyst" switch high which jumps feedback higher than 1.25V resulting fixed output ripple which given following equation: Vo=(Rt/Rh)x11 Where: Rt=Top resistor output divider, resistor connected from Vout Vfb1 IRU3033
Rev. 1/14/99
4-84
IRU3033
Rh=Bottom resistor divider, resistor connected from Vfb1 Vhyst pin. example, Rt=1k Rh=422k, then output ripple Vo=(1/422)x11=26mV advantage fixed output ripple that when output voltage changes from 3.5V, ripple voltage remains same which important meeting Intel maximum tolerance specification. Switcher Output Voltage Setting output voltage switcher using following equations: Assuming, Vo=3.38V selected output ripple 1.3%(44mV) output voltage, equations derived that selects resistor divider hysterises resistor. Assuming, Rt=1k Rh=(11*Rt)/V Where: Rt=Top resistor resistor divider Rh=Hysterises resistor connected between pins IRU3033 Vo=Selected output ripple (typically output voltage) Assuming, Vo=44mV Rh=(11*1000)/0.044=250k Select Rh=249k, bottom resistor divider then calculated using following equations: Rb=Rt/X Where: Rb=Bottom resistor divider X=[(Vo (Vo/2))/Vref] Vref=1.25 typical X=[(3.38+ (0.044/2))/1.25] 1.72 Rb=1000/1.72=580 Select Rb=576, Frequency Calculation IRU3033 frequency operation calculated using following formula: Fs=[(Vo*(1-D)*ESR)]/(L*Vo) (MHz) Where: Vo=Output voltage D=Duty cycle ESR=Output capacitor L=Output inductance (µH) Vo=Output ripple voltage example: D(Vo Vf)/Vin Where, Vf=Forward voltage drop Schottky diode D=(3.38 0.5)/5=0.78 ESR=18m Sanyo 1500µF, 6MV1500GX caps. L=3.5µH then, calculated follows: 0.087Mhz 87kHz
Rev. 1/14/99
4-85
IRU3033
Notes
4-86
Rev. 1/14/99

SWITCHER LINEAR CONTROLLER FEATURES Controller allows cost pass t

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