iru3021m 1 rev. 1.5 07/17/02 www.irf.com typical application description the iru3021m controller ic is specifically designed to meet intel specification for next generation microproces- sor applications requiring multiple on-board regulators. the iru3021m provides a single chip controller ic for the vcore, three ldo controllers, one with an automatic select pin that connects to the type detect pin of the agp slot for the agp v ddq supply, one for gtl+ and the other for the 1.8v chip set regulator as required for the next generation pc applications. the iru3021m uses n-channel mosfet as pass transistor for v out 2(v ddq ), v out 3(1.5v) and v out 4(1.8v). no external resistor di- vider is necessary for any of the regulators. the switch- ing regulator feature a patented topology that in combi- nation with a few external components as shown in the typical application circuit, will provide well in excess of 20a of output current for an on-board dc/dc converter while automatically providing the right output voltage via the 5-bit internal dac .the iru3021m also features, loss- less current sensing for both switcher by using the r ds(on) of the high-side power mosfet as the sensing resistor, an output under-voltage shutdown that detects short cir- cuit condition for the linear outputs and latches the sys- tem off, and a power good window comparator that switches its open collector output low when any one of the outputs is outside of a pre-programmed window. provides single chip solution for vcore, gtl+, agp bus, and 1.8v automatic voltage selection for agp slot v ddq supply linear regulator controller on-board for 1.8v designed to meet intel latest vrm specification for next generation microprocessors on-board dac programs the output voltage from 1.3v to 3.5v linear regulator controller on-board for 1.5v gtl+ supply loss-less short circuit protection for all outputs synchronous operation allows maximum effi- ciency patented architecture allows fixed frequency operation as well as 100% duty cycle during dynamic load minimum part count soft-start high current totem pole driver for direct driving of the external power mosfet power good function monitors all outputs over-voltage protection circuitry protects the switcher output and generates a fault output package order information features 5-bit programmable synchronous buck controller ic with triple ldo controller applications total power solution for next generation intel processor application t a ( 8 c) device package 0 to 70 iru3021mcw 28-pin plastic soic wb data sheet no. pd94145 figure 1 - typical application of the iru3021m. linear control linear control switcher control iru3021m v out 3 5v v out 1 v out 4 linear control v out 2 3.3v
2 rev. 1.5 07/17/02 iru3021m www.irf.com electrical specifications absolute maximum ratings v5 supply voltage ................................................... 7v v12 supply voltage .................................................. 20v storage temperature range ...................................... -65c to 150c operating junction temperature range ..................... 0c to 125c package information 28-pin wide body plastic soic (w) unless otherwise specified, these specifications apply over v12=12v, v5=5v and t a =0 to 70c. typical values refer to t a =25c. low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. u ja =80 8 c/w drive2 fix vid4 vid3 vid2 vid1 vid0 pgood sd v sen 2 select ss fault / rt v sen 4 drive4 nc gnd drive3 v sen 3 v5 fb v sen 1 ocset pgnd lgate phase ugate v12 4 3 2 1 25 26 27 28 14 7 6 5 15 22 23 24 top view 13 16 12 17 11 18 10 19 9 20 8 21 supply uvlo section uvlo threshold-12v uvlo hysteresis-12v uvlo threshold-5v uvlo hysteresis-5v supply current operating supply current vid section (vcore only) dac output voltage (note 1) dac output line regulation dac output temp variation vid input lo vid input hi vid input internal pull-up resistor to v5 v sen 2 voltage parameter sym test condition min typ max units switching controllers; vcore (v sen 1) and agp (v sen 2) supply ramping up supply ramping up v12 v5 select <0.8v select >2v 0.99vs 2 10 0.6 4.4 0.3 6 30 vs 0.1 0.5 27 1.5 3.3 1.01vs 0.8 v v v v ma v % % v v k v v
iru3021m 3 rev. 1.5 07/17/02 www.irf.com note 1: vs refers to the set point voltage given in table 1. error comparator section input bias current input offset voltage delay to outout current limit section cs threshold set current cs comp offset voltage hiccup duty cycle output drivers section rise time fall time dead band time between high side and synch drive (vcore switcher only) oscillator section (internal) osc frequency 1.8v regulator (v sen 4) v sen voltage v sen voltage input bias current output drive current 1.5v regulator (v sen 3) v sen voltage v sen voltage input bias current output drive current power good section v sen 1 uv lower trip point v sen 1 uv upper trip point v sen 1 uv hysterises v sen 1 hv upper trip point v sen 1 hv lower trip point v sen 1 hv hysterises v sen 2 trip point v sen 3 trip point v sen 4 trip point power good output lo power good output hi fault (overvoltage) section core ov upper trip point core ov lower trip point fault output hi soft-start section pull-up resistor to 5v parameter sym test condition min typ max units -2 -5 50 50 m a mv ns m a mv % ns ns ns khz v v m a ma v v m a ma v v v v v v v v v v v v v v m a 2 +2 100 +5 2 2 200 10 70 70 200 217 1.800 1.800 1.500 1.500 0.90vs 0.92vs 0.02vs 1.10vs 1.08vs 0.02vs 1.100 2.560 0.920 1.320 0.920 1.140 0.4 4.8 1.17vs 1.15vs 10 20 v o 4 v o 3 v diff =10mv css=0.1 m f c l =3000pf c l =3000pf c l =3000pf rt=open t a =25 8 c, drive4=v sen 4 v aux - v drive >0.6v t a =25 8 c, drive3=v sen 3 v aux - v drive >0.6v v sen 1 ramping down v sen 1 ramping up v sen 1 ramping up v sen 1 ramping down select <0.8v select >2v fix=gnd fix=open fix=gnd fix=open r l =3ma r l =5k, pull-up to 5v v sen 1 ramping up v sen 1 ramping down io=3ma ocset=0v, phase=5v
4 rev. 1.5 07/17/02 iru3021m www.irf.com this pin controls the gate of an external mosfet for the agp linear regulator. leaving this pin open provides fixed output voltages of the 1.5v and 1.8v for the #3 and #4 linear regulators. when this pin is grounded the reference to the linear regulators are set to 1.26v and therefore the output of the regulators can be programmed to any voltages above the 1.26v using: v out =1.26 3 (1 + r top /r bot ) where: r top = top resistor connected from the output to the v sense pin. r bot = bottom resistor connected from the v sense pin to ground. this pin selects a range of output voltages for the dac. when in the low state the range is 1.3v to 2.05v and when it switches to hi state the range is 2.0v to 3.5v. this pin is ttl compatible that realizes a logic ?1? as either hi or open. when left open, this pin is pulled up internally by a 27k v resistor to 5v supply. msb input to the dac that programs the output voltage. this pin is ttl compatible that realizes a logic ?1? as either hi or open. when left open, this pin is pulled up internally by a 27k v resistor to 5v supply. input to the dac that programs the output voltage. this pin is ttl compatible that realizes a logic ?1? as either hi or open. when left open, this pin is pulled up internally by a 27k v resistor to 5v supply. input to the dac that programs the output voltage. this pin is ttl compatible that realizes a logic ?1? as either hi or open. when left open, this pin is pulled up internally by a 27k v resistor to 5v supply. lsb input to the dac that programs the output voltage. this pin is ttl compatible that realizes a logic ?1? as either hi or open. when left open, this pin is pulled up internally by a 27k v resistor to 5v supply. this pin is an open collector output that switches lo when any of the outputs are outside of the specified under-voltage trip point. it also switches low when v sen 1 pin is more than 10% above the dac voltage setting. pin descriptions d4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 d3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 d2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 d1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 d0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 vs 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 d4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 d3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 d2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 d1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 d0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 vs 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 table 1 - set point voltage vs. vid codes. pin# pin symbol pin description 1 2 3 4 5 6 7 8 drive2 fix vid4 vid3 vid2 vid1 vid0 pgood
iru3021m 5 rev. 1.5 07/17/02 www.irf.com this pin provides shutdown for all the regulators. a ttl compatible, logic level high applied to this pin disables all the outputs and discharges the soft-start capacitor. the sd signal turns off the synchronous mosfet allowing body diode to conduct and discharge the output capacitor. this pin provides the feedback for the agp linear regulator. the select pin when con- nected to the "type detect" pin of the agp slot automatically selects the right voltage for the agp v ddq . this pin provides automatic voltage selection for the agp switching regulator. when it is pulled lo, the voltage is 1.5v and when left open or pulled to hi, the voltage is 3.3v. this pin provides the soft-start for all the regulators. an internal current source charges an external capacitor that is connected from this pin to ground which ramps up the outputs of the regulators, preventing the outputs from overshooting as well as limiting the input cur- rent. the second function of the soft-start cap is to provide long off time (hiccup) for the synchronous mosfet during current limiting. this pin has dual function. it acts as an output of the over-voltage protection circuitry or it can be used to program the frequency using an external resistor. when used as a fault detector, if any of the switcher outputs exceed the ovp trip point, the fault pin switches to 12v and the soft-start cap is discharged. if the fault pin is to be connected to any external circuitry, it needs to be buffered. this pin provides the feedback for the linear regulator that its output drive is drive4. this pin controls the gate of an external mosfet for the 1.8v chip set linear regulator. this pin is not connected internally. this pin serves as the ground pin and must be connected directly to the ground plane. this pin controls the gate of an external transistor for the 1.5v gtl+ linear regulator. this pin provides the feedback for the linear regulator that its output drive is drive3. 5v supply voltage. a high frequency capacitor (0.1 to 1 m f) must be placed close to this pin and connected from this pin to the ground plane for noise free operation. this pin provides the feedback for the synchronous switching regulator. typically this pin can be connected directly to the output of the switching regulator. however, a resistor divider is recommended to be connected from this pin to v out 1 and ground to adjust the output voltage for any drop in the output voltage that is caused by the trace resistance. the value of the resistor connected from v out 1 to fb1 must be less than 1000 v . this pin is internally connected to the under-voltage and over-voltage comparators sens- ing the vcore status. it must be connected directly to the vcore supply. this pin is connected to the drain of the power mosfet of the core supply and it provides the positive sensing for the internal current sensing circuitry. an external resistor pro- grams the current sense threshold depending on the r ds of the power mosfet. an external capacitor is placed in parallel with the programming resistor to provide high fre- quency noise filtering. this pin serves as the power ground pin and must be connected directly to the ground plane close to the source of the synchronous mosfet. a high frequency capacitor (typi- cally 1 m f) must be connected from v12 pin to this pin for noise free operation. output driver for the synchronous power mosfet for the core supply. this pin is connected to the source of the power mosfet for the core supply and it provides the negative sensing for the internal current sensing circuitry. output driver for the high side power mosfet for the core supply. this pin is connected to the 12v supply and serves as the power vcc pin for the output drivers. a high frequency capacitor (typically 1 m f) must be placed close to this pin and pgnd pin and be connected directly from this pin to the ground plane for the noise free operation. pin# pin symbol pin description 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 sd v sen 2 select ss fault / rt v sen 4 drive4 nc gnd drive3 v sen 3 v5 fb v sen 1 ocset pgnd lgate phase ugate v12
6 rev. 1.5 07/17/02 iru3021m www.irf.com block diagram figure 2 - simplified block diagram of the iru3021m. pwm control v12 v12 osc slope comp + 1.26v 5-bit dac enable soft start & fault logic 200ua 0.9vset 1.1vset 1.17vset vset enable uvlo vset enable pgood v sen 2 drive4 select drive3 fix v sen 1 drive2 v5 v12 ss gnd fault / rt phase ocset lgate ugate fb sd v sen 4 v sen 3 pgnd over current over voltage vid4 vid3 vid2 vid1 vid0 r 3r r 3r 1.5v 3.3v 28 20 9 22 8 19 14 2 15 18 11 1 10 3 4 5 6 7 12 13 17 24 23 26 25 27 21
iru3021m 7 rev. 1.5 07/17/02 www.irf.com figure 3 - typical application of iru3021m in a dual layout with hip6021 for an on-board dc-dc converter providing power for the vcore, gtl+, 1.8v chip set supply as well as auto select agp supply for the next generation pc applications. typical application (dual layout with hip6021) part# r3 r5 r9 r12 c15 c16 c17 hip6021 o s o v o v v iru3021m s o s o v o o s - short o - open v - see ir or harris parts list for the value table 2 - dual layout component table. 12v 3.3v in v out 3 1.5v v out 4 1.8v pgood vcore c2 l1 r11 c17 r12 c16 r8 c14 q3 c22 r14 r6 c7 l2 r7 r4 q1 c3 c4 r2 c5 q5 c15 c19 c20 r10 r1 5v c1 u1 r9 q4 c18 q2 c13 v out 2 1.5v / 3.3v r5 r3 type detect r13 c21 vcc3 drive3 v sen 4 gnd v sen 3 select sd vid3 vid2 fault / rt vid1 vid0 pgnd v12 drive4 lgate phase ugate ocset ss fb v sen 1 pgood v5 (comp) nc (vaux) drive2 v sen 2 vid4 fix iru3021m c6
8 rev. 1.5 07/17/02 iru3021m www.irf.com ref desig description qty part # manuf q1 mosfet 1 irl3103s, to-263 package ir q2 mosfet 1 irlr3103, to-252 package ir q3 mosfet with schottky 1 irl3103d1s, to-263 package ir q4,5 mosfet 2 irlr024, to-252 package ir l1 inductor 1 l=1 m h, 5052 core with 4 turns of micro metal 1.0mm wire l2 inductor 1 l=2.7 m h, 5052b core with 7 turns of micro metal 1.2mm wire c1 capacitor, electrolytic 1 10mv470gx, 470 m f, 10v sanyo c2,3 capacitor, electrolytic 2 10mv1200gx, 1200 m f, 10v sanyo c4 capacitor, ceramic 1 220pf, 0603 c5 capacitor, ceramic 1 1 m f, 0805 c6,18 capacitor, electrolytic 2 6mv1000gx, 1000 m f, 6.3v sanyo c7 capacitor, electrolytic 6 6mv1500gx, 1500 m f, 6.3v sanyo c13,19 capacitor, electrolytic 1 6mv1500gx, 1500 m f, 6.3v sanyo c14,15 capacitor, ceramic 2 1 m f, 0603 c16,17 capacitor, ceramic 2 see table 2, dual layout component 0603 3 2 c20,21 capacitor, ceramic 2 0.1 m f, 0603 c22 capacitor, ceramic 1 1000pf, 0603 r1 resistor 1 10 v , 5%, 0603 r2 resistor 1 3.3k v , 5%, 0603 r3,5,12 resistor 3 see table 2, dual layout component 0603 3 3 r4,7,14 resistor 3 4.7 v , 5%, 1206 r6,8,10 resistor 3 2.2k v , 1%, 0603 r9 resistor 1 0 v , 0603 r11 resistor 1 220k v , 1%, 0603 r13 resistor 1 10k v , 5%, 0603 iru3021m applica tion parts list dual layout with hip6021 ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: (310) 252-7105 tac fax: (310) 252-7903 visit us at www.irf.com for sales contact information data and specifications subject to change without notice. 02/01
iru3021m 9 rev. 1.5 07/17/02 www.irf.com (w) soic package 28-pin surface mount, wide body note: all measurements are in millimeters. min 17.73 0.36 7.40 2.44 0.10 0.23 10.11 0 8 0.51 0.63 2.44 max 17.93 0.46 7.60 2.64 0.30 0.32 10.51 8 8 1.01 0.89 2.64 1.27 bsc 0.66 ref 28-pin symbol a b c d e f g i j k l r t i k detail-a detail-a r pin no. 1 0.51 6 0.020 x 45 8 t a b d l j c f g h e
10 rev. 1.5 07/17/02 iru3021m www.irf.com ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: (310) 252-7105 tac fax: (310) 252-7903 visit us at www.irf.com for sales contact information data and specifications subject to change without notice. 02/01 pkg desig w package description soic, wide body parts per tube 27 parts per reel 1000 package shipment method pin count 28 t & r orientation fig a feed direction figure a 1 1 1
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