SEMTECH SC2646B

SC2646B 2, 3 or 4 Phase TM Combi-Sense PWM Controller POWER MANAGEMENT Description Features ! VRD/VRM10.X compliant The SC2646B controller provides a microprocessor core ! Core Voltage Set Point Accuracy 0.5% voltage regulation solution for up to 4 paralleled PWM TM ! Combi-Sense Current Mode Control channels. The solution can be configured in 2, 3, or 4- ! Intrinsic Phase Current Matching phase form. This multi-phase buck regulator utilizes ! Fast Transient Responses phase-shift timing control to allow interleaved switching of ! Active Droop to Meet Load Line Slope the power switches. The product’s architecture minimizes ! Enable Function for Power Sequencing the core voltage ripple and the input current ripple, which ! Cycle-by-Cycle Peak Current Limit leads to optimized voltage regulator design for power den- ! Intelligent Over Current Shut Down sity, transient responses, and thermal performances. ! Over Voltage Protection When Using Semtech TM Combi-Sense Driver SC1211 To satisfy the highly dynamic nature of the modern micro- ! Under Voltage Protection Built in processors, the SC2646B adopts peak current mode con- ! Externally Programmable Soft-Start trol topology which ensures wide control loop bandwidth ! Externally Programmable Switching Frequency and fast transient responses. The current mode control ! 2, 3, or 4-Phase Configurations provides intrinsic phase current matching. The maximum ! 24-Pin TSSOP Package ripple frequency is greater than 2MHz. One of the outstanding features of the SC2646B device is its voltage regulation accuracy. Not only does it provide TM Combi-Sense is a Trademark of Semtech Corporation 0.5% set point accuracy, but also the accuracy to be fully compliant with stringent load line slope specifications man- dated by the modern microprocessors. Lossless output Applications current sensing ensures the regulator output voltage is accurately positioned according to the load current condi- ! Voltage Regulator VRD/VRM10.X ! Voltage Regulation Modules tion. ! High Current, Low Voltage Step Down DC/DC TM Semtech’s patented Combi-Sense topology is employed Converters by SC2646B controller. The MOSFET R and the output ds(on) inductor winding resistance is used to generate the phase TM current information. Semtech’s SC1211 Combi-Sense MOSFET driver works with the SC2646B to enable a com- plete solution. The cycle-by-cycle current limit plus the intelligent over cur- rent shut down provide the maximum versatility of the sys- tem without false tripping under all possible changes of VID and load conditions. The differential voltage feed- back sense eliminates the error caused by high load cur- rent on the ground plane. External offset is easy to achieve for the VID settings. The enable function is also provided to interface with the corresponding system signal for cor- rect start up timing and shut down timing. Revision: Sept. 12, 2005 1 www.semtech.com VIN ATX12V L1 ATX12V VOUT 1 2 1800uF/16V 640nH + C1 R1 D1 C3 C2 4.7uF/1206 2R2 PN1 PN2 PN3 C4 AUX1 AUX2 AUX3 D1N4148 1uF M1 1800uF/6.3V U1 R2 R3 R4 R5 R6 R7 PN3 PN3 44.2K 44.2K 44.2K C5 MSENSE AUX3 R8 L2 TBD TBD TBD C6 1 2 1800uF/6.3V 1 R9 R11 1nF 9 R12 820nH PGND C7 C8 R10 C9 54.9K 54.9K C11 6.8nF 6.8nF 54.9K 6.8nF C10 R13 M2 M3 IR0 TBD R14 1800uF/6.3V TBD 100 C12 2.2nF U2 C13 VOUT 1 24 C14 C15 1800uF/6.3V OS3 OS4 2 23 VCC 1uF 4.7uF OS2 OUTSEN VIN VRM_EN 3 22 OS1 OUT4 C17 R15 D2 C16 1800uF/16V (Open-Collector) 4 21 1800uF/6.3V BGOUT OUT3 C18 + 300 5 20 D1N4148 1uF C19 ERROUT OUT2 M4 4.7uF/1206 R16 6 19 GNDSEN OUT1 C21 C20 20K VCC MSENSE 7 18 PN2 PN2 1800uF/6.3V 1uF FB AGND AUX2 R18 L3 C22 8 17 R17 C23 1 2 MSENSE OSCREF 470pF 1 9 16 320K 1nF 9 R19 820nH VCC PGOOD PGND C24 ATX12V R20 10 15 M5 M6 IR0 1800uF/6.3V VID4 VID5 R21 11 14 U3 VID3 VID0 10 C25 100 C26 12 13 VID2 VID1 C27 3.3V 4.7uF 2.2nF 1800uF/6.3V C28 C29 SC2646 1uF 4.7uF VIN R22 R23 R24 R25 R26 R27 1K 1K 1K 1K 1K 1K C31 D3 C30 1800uF/16V 1800uF/6.3V + C32 VID0 D1N4148 1uF M7 C33 4.7uF/1206 VID1 C34 VID2 PN1 PN1 1800uF/6.3V AUX1 R28 L4 VID3 C35 1 2 VID4 1 1nF 9 820nH PGND R29 VID5 M8 M9 VCC R30 IR0 U4 100 C36 R31 R32 PGOOD (3V3 LOGIC) PGND 2.2nF 2.9K 0R0 C37 C38 C39 V_CORE- R33 1uF 4.7uF DIFFERENTIAL PAIR 10nF 1.1K FOR REMOTE SENSE V_CORE+ SC2646B POWER MANAGEMENT Typical Application Circuit SC 1211 S C 12 11 S C 12 11 5 4 5 4 5 4 VPN CO VPN CO VPN CO 6 3 6 3 6 3 VIN BST VIN BS T VIN BST 7 2 7 2 7 2 VR EG TG VR EG TG VR EG TG 8 1 8 1 8 1 BG DR N BG DR N BG DR N + + + + + + + + + + HIGH FREQUENCY DECOUPLING NOT SHOWN  2005 Semtech Corp. 2 www.semtech.com SC2646B POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter Sm ymbol Ms aximu Unit SV upply Voltage 2V 0 CC Combi-Sense/Direct Output VoltageO5 S1, OS2, OS3, OS4, OUTSEN V o AT mbient Temperature Range 0 to 85 C A o JT unction Temperature Range 0 to 125 C J o ST torage Temperature Range -65 to +150 C STG o LT ead Temperature (Soldering) 10 Sec. 260 C LEAD Electrical Characteristics o Unless specified: V = 12V, F = 600kHz, 4 phase operation, V = 1.28V, T = 27 C. See Typical Application Circuit. Specifications subject to change without CC OSC OUT A notice. Pl arameter Ss ymboTn est Condition Mp i Tx y Ms a Unit Chip_Supply IV C Supply Voltage 72141V CC II C Supply Current 50 .4 8A . m CC UVLO Ramp Up 60 .3 7V . UVLO Hysteresis 70 008V 9 m Reference Section BV andgap Output C=5 4.7nF 1V . BGOUT BGOUT Source Current 50 5 75 9 µA SV upply Rejection =5 10.0V ~ 14.0V 0V . mV/ CC o o Temperature Stability (1) 0 C < T < 85C50% . A VV oltage Accuracy I5 nternal offset is -20mV-5 0. +% 0. OUT Oscillator Section OF scillator Frequency R=0 320K 50 4 60 0 6z 6 kH OSC OSC OF scillator Frequency Range 50 00 3z 00 kH OSC o o Temperature Stability (1) 0 C < T < 85C5+% /- A Voltage Error Amplifier Input Bias Current (1) 2A 5 n Open Loop Gain (1) 1V < VERROUT<0 3.4V 8B d  2005 Semtech Corp. 3 www.semtech.com SC2646B POWER MANAGEMENT Electrical Characteristics (Cont.) o Unless specified: V = 12V, F = 600kHz, 4 phase operation, V = 1.28V, T = 27 C. See Typical Application Circuit. Specifications subject to change without CC OSC OUT A Pl arameter Ss ymboTn est Condition Mp i Tx y Ms a Unit Unity Gain Bandwidth (1) G C=5 10pF MHz BW ERROUT SV ource Current BG > 1.8V, VFB = 0V, VERROUT=0 0.8V60809A u SV ink Current BG > 1V, VFB = 2V, VERROUT=0 2V -0 9 -0 8 -A 6 u TG ransconductance Gain 02 .62 03 .8 1V .0 mA/ M Current Sense Amplifiers IV nput Offset Voltage +V /-3 m IO II nput Bias Current 5A 0 n M GG ain 1V 2.45 V/ ca CMRR (1) 00 to 3V 8B d Input Common Mode Range -3 0.3 V Gain Match 56 % Bandwidth (1) 6z MH Droop Amplifier GA ain VMSENSE-VOUTSEN=1 20mV 17 1. 13 1. 1V 2. V/ DRP VIDs Logic High [8 VID0:5] 0V . Logic Low [4 VID0:5] 0V . Internal Pull-up Impedance (1) [6 VID0:4] 2m Koh Internal Pull-up Voltage (1) [4 VID0:4] 1V . 3-Phase Operation Output 4 pull up Threshold 30 .88 45 . 4V . Power Good Threshold Rising V0 ID - Power Good Threshold 1V 0 m Threshold Falling V0 ID - Power Good Threshold 2V 5 m Power Good Delay (1) F0 rom Cross Rising Threshold 45 . 6S .5 m Output High Leakage Pwrgood = V 6A 0 n CC Output Voltage Low Level S8 ink Current = 1mA 05 .4 0V . Current Limit Section MV ax. Error Amp Voltage for Current Limit 33 .45 31 .6 3V .8 OC SV hutdown Voltage V0 ID - Shut Down Threshold 10 8 20 1 2V 8 m SD Note: (1). Guaranteed by design, not tested in production. (2). This device is ESD sensitive. Use of standard ESD handling precautions is required.  2005 Semtech Corp. 4 www.semtech.com SC2646B POWER MANAGEMENT Pin Configurations Ordering Information Top View Pe art NumberPT ackag Temp. Range ( ) J 1 24 OS 4 OS3 (1) (2) O SC2646BTSTRTT5 SSOP-24 0 to 12 C 2 23 OU T S E N OS 2 3 22 OU T 4 OS 1 Sd C2646BEVB Embedded Evaluation Boar 4 21 BG O U T OU T 3 5 20 OU T 2 E R RO UT Note: 6 19 OU T 1 GSENSE (1) Only available in tape and reel packaging. A reel contains 2500 devices for 7 18 AG N D FB the TSSOP-24 package. 8 17 OS C R E F M S EN SE (2) Lead free package.Device is fully WEEE and RoHS compliant. 9 16 PG O O D VC C 10 15 VID 5 VID 4 11 14 VID 0 VID 3 12 13 VID 1 VID 2 (24-Pin TSSOP) Pin Descriptions Pe in#Pn in Nam Pin Functio 13Ot S Current sense inpu 22O. S Current sense input. Connect to OUTSEN for 2 phase operation 31Ot S Current sense inpu 4TB. GOU Bandgap reference voltage. Connect soft start cap to AGND 5T ERROU Error-amplifier output. Connect compensation network to AGND. 6EG. SENS Remote sense for GND 7B F Feedback pin. Route FB and Gsense as differential pair to CPU sense point. 8EM. SENS Voltage regulator module output current sense 9CV. C Power supply for chip 1] 0V. ID[4:0 VID MSB to LSB 15 5V. ID 12.5mV bit 1D 6P. GOO Power good. Open collector output 1F 7O. SCRE Oscillator frequency setting. Connect a resistor to AGND 1D 8A. GN Clean ground for analog signals 11 9O. UT PWM output1 22 0O. UT PWM output2 23 1O. UT PWM output3 24 2O. UT PWM output4. Connect to VCC for 3 phase operation 2N 3O. UTSE Direct output sense 24 4 OS Current sense input. Connect to OUTSEN for 2 or 3 phase operation.  2005 Semtech Corp. 5 www.semtech.com SC2646B POWER MANAGEMENT Block Diagram C/A1 3 + OS1 DRV1 PWM1 OUT + - OUT R Q 19 OUT1 C/A2 - S 2 + OS2 DRV2 PWM2 OUT + - OUT R Q 20 OUT2 C/A3 - S 1 + OS3 DRV3 PWM3 OUT + - OUT R Q 21 OUT3 C/A4 - S 24 + OS4 DRV4 PWM4 OUT + OUTSEN - OUT R Q 22 OUT4 - S 23 OUTSEN OSCILLATOR ERROUT CLOCK DIVIDER Ramp 17 ROSC OSCREF OSC CLK P1 P2 P3 SEL3 P4 + OUT 3 PHASE - 14 11111 SELECT VID0 4.2V INHIBIT DAC 13 VID1 VID0 12 VID1 VID2 VID2 I_DAC VID3 11 VID4 VID3 VID5 10 VID4 PWR_GOOD 15 + 16 VID5 PWRGD OUTSEN OUT DELAY DROOP 0.8*VBG - - OUT 8 + MSENSE ERROUT E/A 7 - FB R OUT 5 ERROUT + OCP & BGOUT SHUTDOWM - VBG 4 OUT BGOUT BUFFER + 9 VCC VCC UVLO & + 18 LATCH AGND VREF BGOUT - GSENSE 6  2005 Semtech Corp. 6 www.semtech.com Shut Down VCC SC2646B POWER MANAGEMENT Applications Information- Output Voltage VRD10 Output Voltage Vout Unless specified: 0 = GND; 1 = High. T = 25°C, V = 12V A CC (V) V4 ID5 V3 ID V2 ID V1 ID V0 ID VID 0 0 1 0 1 0 0.8375 1 0 1 0 0 1 0.8500 0 0 1 0 0 1 0.8625 1 0 1 0 0 0 0.8750 0 0 1 0 0 0 0.8875 1 0 0 1 1 1 0.9000 0 0 0 1 1 1 0.9125 1 0 0 1 1 0 0.9250 0 0 0 1 1 0 0.9375 1 0 0 1 0 1 0.9500 0 0 0 1 0 1 0.9625 1 0 0 1 0 0 0.9750 0 0 0 1 0 0 0.9875 1 0 0 0 1 1 1.0000 0 0 0 0 1 1 1.0125 1 0 0 0 1 0 1.0250 0 0 0 0 1 0 1.0375 1 0 0 0 0 1 1.0500 0 0 0 0 0 1 1.0625 1 0 0 0 0 0 1.0750 0 0 0 0 0 0 1.0875 1 1 1 1 1 1 OFF 0 1 1 1 1 1 OFF 1 1 1 1 1 0 1.1000 0 1 1 1 1 0 1.1125 1 1 1 1 0 1 1.1250 0 1 1 1 0 1 1.1375 1 1 1 1 0 0 1.1500 0 1 1 1 0 0 1.1625 1 1 1 0 1 1 1.1750 0 1 1 0 1 1 1.1875 1 1 1 0 1 0 1.2000 0 1 1 0 1 0 1.2125 1 1 1 0 0 1 1.2250 0 1 1 0 0 1 1.2375 1 1 1 0 0 0 1.2500 0 1 1 0 0 0 1.2625 1 1 0 1 1 1 1.2750 0 1 0 1 1 1 1.2875 1 1 0 1 1 0 1.3000 0 1 0 1 1 0 1.3125 1 1 0 1 0 1 1.3250 0 1 0 1 0 1 1.3375 1 1 0 1 0 0 1.3500 0 1 0 1 0 0 1.3625 1 1 0 0 1 1 1.3750 0 1 0 0 1 1 1.3875 1 1 0 0 1 0 1.4000 0 1 0 0 1 0 1.4125 1 1 0 0 0 1 1.4250 0 1 0 0 0 1 1.4375 1 1 0 0 0 0 1.4500 0 1 0 0 0 0 1.4625 1 0 1 1 1 1 1.4750 0 0 1 1 1 1 1.4875 1 0 1 1 1 0 1.5000 0 0 1 1 1 0 1.5125 1 0 1 1 0 1 1.5250 0 0 1 1 0 1 1.5375 1 0 1 1 0 0 1.5500 0 0 1 1 0 0 1.5625 1 0 1 0 1 1 1.5750 0 0 1 0 1 1 1.5875 1 0 1 0 1 0 1.6000  2005 Semtech Corp. 7 www.semtech.com SC2646B POWER MANAGEMENT Outline Drawing - TSSOP-24 DIMENSIONS A INCHES MILLIMETERS DIM D e MIN NOM MAX MIN NOM MAX - - - - A .047 1.20 N - - A1 .002 .006 0.05 0.15 - - A2 .031 .042 0.80 1.05 2X E/2 - - b .007 .012 0.19 0.30 c - - .003 .007 0.09 0.20 E1 D .303 .307 .311 7.70 7.80 7.90 E E1 .169 .173 .177 4.30 4.40 4.50 PIN 1 INDICATOR E .252 BSC 6.40 BSC e .026 BSC 0.65 BSC L .018 .024 .030 0.45 0.60 0.75 L1 (.039) (1.0) ccc C 1 2 3 e/2 N 24 24 2X N/2 TIPS - - 01 0° 8° 0° 8° B aaa .004 0.10 bbb .004 0.10 ccc .008 0.20 D aaa C A2 A SEATING PLANE H C A1 bxN c bbb C A-B D GAGE PLANE 0.25 L 01 (L1) DETAIL A SEE DETAIL A SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS A -A- ND T -B- O BE DETERMINED AT DATUM PLANE -H- 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MO-153, VARIATION AD.  2005 Semtech Corp. 8 www.semtech.com SC2646B POWER MANAGEMENT Land Pattern - TSSOP-24 X DIMENSIONS DIM INCHES MILLIMETERS (.222) (5.65) C G .161 4.10 (C) G Z P .026 0.65 X .016 0.40 Y .061 1.55 Y Z .283 7.20 P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804  2005 Semtech Corp. 9 www.semtech.com