SC613 SEMTECH | Alldatasheet
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1 www.semtech.com POWER MANAGEMENT SC613 Low Noise Regulated Charge Pump with Selectable Output February 8, 2005 Description Features
Applications
Typical Application Circuit The SC613 is a versatile charge pump designed for use in battery operated power supply applications. The wide input range is matched for Li-Ion battery applications. Only two 1uF ceramic bucket capacitors are required, and the inductorless implementa- tion provides a reduced-EMI solution. Low noise mode switching circuitry and constant output current allow the use of 1uF input and output capacitors. The SC613 charge pump regulator can be used for applications that require up to 140mA of output current with a 4.5V output. The 5.0V output version provides up to 100mA of output current. The small package size, low component count and lower overall system cost coupled with its low noise make the SC613 a supe- rior solution compared to switch mode regulator designs. Small size - MLP Micro 10 lead 3x3mm package Selectable 5.0V or 4.5V output voltage 140mA available with 4.5V output 100mA available with 5.0V output Short circuit protection Soft Start function Shutdown current <2µA Selectable fixed frequencies of 262kHz and 650kHz Low ripple Regulated to +/-5% Ease of use Cellular phones LED photo flash for cellular phones LED backlighting PDA power supplies Portable electronics Electronic books Wireless web appliances Cin 1.0uF 2.7V to 6.5V Cbucket1 1.0uF Cbucket2 1.0uF VIN EN VSEL FSEL GND CF2- CF2+ CF1- CF1+ VOUT3 SC613 Cout 1.0uF UP TO 10 LEDS 4.5V or 5.0V
2 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Absolute Maximum Ratings
Electrical Characteristics
retemaraPl obmySm umixaMs tinU egatloVylppuSV NI 0.7+ot3.0-V egatloVtuptuOV TUO 0.7+ot3.0-V V TUO noitaruDtiucriCtrohSC Se tinifednI tneibmAoTnoitcnuJ,ecnatsiseRlamrehT )dohteMdradnatS15DSEJ( θ AJ 13W /C° tneibmAgnitarepOT A 58+ot04-C ° egnaRerutarepmeTnoitcnuJT CJ 051+ot04-C ° egnaRerutarepmeTegarotST GTS 051+ot56-C ° erutarepmeTwolfeRRIT DAEL 062C ° retemaraPl obmySs noitidnoCn iMp yTx aMs tinU egatloVylppuStupnIV NI 5.25 .6V tnerruCtnecseiuQI Q I,zHk262=.qerF TUO V,Am0= NI = V7.3 0.14 .1A m I,zHk056=.qerF TUO V,Am0= NI = V7.3 1.28 .2A m 0=elbanE2 A µ egatloVtuptuOV TUO htiwnoitalugeRdaoLcitatS 1=LESV I<Am0 TUO Am001< 57.40 .55 2.5V htiwnoitalugeRdaoLcitatS 0=LESV I<Am0 TUO Am041< 572.45 .45 27.4V tnerruCtuptuOmumixaMI TUO 1=LESV0 01A m 0=LESV0 41A m ycneuqerFpmuPf PMUP 0=LESF,1=elbanE% 51-2 62% 51+z Hk 1=LESF,1=elbanE% 02-0 56% 02+z Hk emiTnoitisnarTedoMycneuqerFT KCOL ycneuqerfenomorfemitnoitisnarT edomycneuqerfrehtoynaotedom ngisedybdeetnaraug 1d oireP tnerruCtiucriCtrohSI CS V TUO I,V0= TUO I= NI 006A m dlohserhThgiHtupnIV HI )LESF,LESV,elbanE(sniptupnillA3 .1V dlohserhTwoLtupnIL IV) LESF,LESV,elbanE(sniptupnillA4 .0V
3 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Note: (1) Peak to peak output ripple voltage with COUT=CBUCKET=1uF and X5R dielectric. (2) Guaranteed by design. (3) This device is ESD sensitive. Use of standard ESD handling precautions is required. retemaraPl obmySs noitidnoCn iMp yTx aMs tinU tnerruChgiHtupnII HI )LESF,LESV,elbanE(sniptupnillA0 1A µ tnerruCwoLtupnII LI )LESF,LESV,elbanE(sniptupnillA0 1A µ otyrettaBmorfycneiciffErewoP tuptuOpmuPegrahCdetalugeR h VNI V,V0.3= TUO I,V0.5= TUO Am05= zHk262=.qerF 5.28% VNI V,V0.3= TUO I,V0.5= TUO Am05= zHk056=.qerF 5.18% egatloVelppiRtuptuOV PP I,zHk262=qerf TUO Am06= )2(,)1( 525 4V m
4 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Pin Descriptions niPe maNniPn oitcnuFniP 1T UOV. V5.4roV0.5otdetalugeregatlovtuptuO 2+ 1FC. 1roticapactekcubfolanimretevitisoP 3N IV. V5.6otV5.2morfgnignaregatlovtupnI 4L ESF ;zHk262=qerf,0=LESF.ycneuqerflanoitarepoehtgnitcelesroftupnicigoL .zHk056=qerf,1=LESF 5L ESV .V5.4=TUOV,0=LESV;V5=TUOV,1=LESV.egatlovtuptuoehtgnitcelesroftupnicigoL 6N E. woltesnehwAu2nahtsselsitnerrucsaiB.elbanehgih-evitcA 7- 2FC. 2roticapactekcubfolanimretevitageN 8D NG. dnuorG 9- 1FC. 1roticapactekcubfolanimretevitageN 01+ 2FC. 2roticapactekcubfolanimretevitisoP Td aPlamrehT elpitlumgnisuenalpdnuorgottcennoC.yllanretnidetcennocton-sesoprupgniknistaehrofdaP .saiv Pin Configuration eciveDe gakcaP )1( TRTLMI316CS )2( mm3x301-PLM BVE316CSd raoBnoitaulavE
Ordering Information
Note: (1) Available in tape and reel only. A reel contains 3000 devices. (2) Available in lead-free package only. This product is fully WEEE and RoHS compliant. T TOP VIEW MLP-10 3X3 LEAD VOUT CF1+ VIN FSEL VSEL EN CF2- GND CF1- CF2+
5 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Block Diagram Applications Information Charge Pump Doubler Type The SC613 uses a voltage doubler circuit which is implemented with two switched or ‘bucket’ capactors. Most charge pump dou- blers use only one bucket capacitor. Two bucket capacitors switch- ing on alternate phases greatly reduce the output ripple voltage and also reduce the size requirement for the output capacitor. Over Voltage Protection The output is prevented from exceeding 6.0V. This feature allows the use of 6.3V ceramic capacitors. Comparison with Other Regulation Methods In many instances, a charge pump regulator is the best choice for portable power applications. These regulators offer many advan- tages over switch mode regulators. A smaller bill of materials, less layout area, lower component height, less noise, no EMF, and less overall circuit cost are typical reasons to use this type of regulation. The efficiency of a charge pump regulator often ap- proaches and in some cases exceeds the efficiency of a switch mode regulator. Inductors are often the largest and most expensive discrete com- ponent in a design. There are no inductors used in the SC613, so the inductor’s cost and layout area are eliminated. The noise and EMF associated with the inductor are also eliminated. The SC613’s fixed frequency harmonics are an advantage in por- table communications equipment, such as cellular telephones. The SC613 has distinct frequencies of operation, so the harmon- ics are predictable. The harmonics are not fixed in a switch mode regulator. Switch mode regulators have harmonics which vary due to the pulse width modulation used to regulate the output. Varying harmonics can be a problem because it may be more EN FSEL VSEL GND VIN MODE SELECT DRIVERS SWITCH BLOCK TIMER COMPARATORSVIN VOUT VREF VIN CF1+ CF1- CF2+ CF2- VOUT EN OSC 650kHz or 262kHz 5.0V or 4.5V difficult to ensure acceptable noise performance over the entire operating range. Many switch mode regulators have increased voltage ripple on the output during pulse skipping mode due to the fact that there are large periods of time when no current is supplied to the output. The SC613 supplies current to the output continuously, so the voltage ripple is less than a switch mode regulator, even with greatly reduced output capacitance. Frequency Selection The FSEL input is for frequency selection. A logic High level at this input will set the clock frequency to 650kHz, while a logic Low sets the clock to 262kHz. Input from a uP or other device may be used to change the charge pump frequency at any time. The optimal frequency will depend upon the capacitor values, the load current, and the exceptable amount of output ripple. Ripple Performance Examples of the output ripple per charge pump frequency and output voltage are listed in the Ripple Performance table on page Efficiency Efficiency for the SC613 is defined as, where V O = output voltage IO = output current VIN = input voltage IQ = quiescent current [from Electrical Characteristics on page 2]. η VO I O⋅ VIN 2I O⋅ I Q+()⋅
6 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Table 2 -Ripple Performance TA = 25°C, Cin=Cout=Cbucket = 1.0µF (ESR = 0.1Ω ) V TUO .qerF ]zHk[ elppiRtupuO ]p-pVm[ dnaAm001ta V5.5otV2.3=niV V0.5 2625 2 0565 1 V5.4 2625 2 0565 1 Calculating Power Dissipation The power dissipated by the SC613 is calculated as, P IN P OUT−P D P D V IN 2 I O⋅ I Q+( )⋅ V O I O⋅− Short Circuit and Over Temperature Protection The output is current limited to 600mA to protect against short circuit conditions. Over temperature protection is also provided. Design and Layout Considerations The center pad “thermal slug” is not internally connected to ground, but should be connected to ground in the layout through vias con- necting to the ground plane. Pin 8 can be routed directly to the center pad. A good ground plane connection is important to make effective use of the low thermal resistance of the MLP package. Short Circuit and Over Temperature Protection The output is current limited to 600mA to protect against short circuit conditions. Over temperature protection is also provided. Design and Layout Considerations The center pad “thermal slug” is not internally connected to ground, but should be connected to ground in the layout through vias con- necting to the ground plane. Pin 8 can be routed directly to the center pad. A good ground plane connection is important to make effective use of the low thermal resistance of the MLP package. Applications Information (cont.)
7 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Typical Characteristics Efficiency vs. Load 0.0% 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% Load Current [mA] Efficiency [%] 5V Output, 3.8V Input 5V Output, 3.2V Input 4.5V Output, 3.8V Input 4.5V Output, 3.2V Input Load Regulation 4.300 4.400 4.500 4.600 4.700 4.800 4.900 5.000 Load Current [mA] Output Voltage [V] 5V Output, 3.8V Input 4.5V Output, 3.8V Input 5V Output, 3.2V Input 4.5V Output, 3.2V Input 4.05 4.1 4.15 4.2 4.25 4.3 4.35 4.4 4.45 4.5 4.55 2 . 533 . 544 . 555 . 5 Input Voltage [V] Output Voltage [V] 650kHz, 140mA 650kHz, 75mA 4.5 4.6 4.7 4.8 4.9 5.1 2.5 3 3.5 4 4.5 5 5.5 Input Voltage [V] Output Voltage [V] 650kHz, 100mA 650kHz, 40mA Efficiency vs. Load Current Load Regulation Quiescent Current Line Regulation for 4.5V Line Regulation for 5.0V Quiescent Currrent 0.500 0.700 0.900 1.100 1.300 1.500 1.700 1.900 2.100 2.300 2.500 Input Voltage [V] Quiescent Current [mA] Vo=4.5, 262kHz Vo=5.0V, 262kHz Vo=4.5V, 650kHz Vo=5.0V, 650kHz
8 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Start Up for 4.5V, 100mA Start Up for 5.0V, 100mA Recommended Minimum Low Pulse Width Recommended Minimum High Pulse Width Recommended Minimum 100Hz PWM Recommended Maximum 500Hz PWM
9 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Output Ripple on 5.0V Output at 262kHz Output Ripple on 5.0V Output at 650kHz Output Ripple on 4.5V Output at 262kHz Output Ripple on 4.5V Output at 650kHz
10 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Application Schematic
11 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Marking Information Top Marking yyww = Datecode (Example: 0252) Evaluation Board Bill of Materials ReferenceReferenceReferenceReferenceReference ValueValueValueValueValue CommentCommentCommentCommentComment U1 SC613 MLP -Micro 10 lead 3x3mm. C1, C2, C3, C4 1.0uF Ceramic, low ESR type, voltage of 6.3V rating is acceptable for all capacitors. C5 10uF This extra capacitor supports usage of long power leads from a benchtop supply. R1 through R10 - Add limiting resistors to meet the requirements of the application on 0805 pads. D1 through D10 - Add white or blue LEDs to meet the requirements of the application on 1206 pads.
12 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Evaluation Board Gerber Plots Top View Bottom View
13 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Land Pattern - MLP 3x3-10 MIN aaa bbb b e L N D C E A DIM MILLIMETERS NOM DIMENSIONS MAXNOM INCHES MIN MAX (LASER MARK) INDICATOR PIN 1 N NOTES: CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS.2. .003 .007 .042 .009 .048 .000 .031 (.008) 0.08 0.23 .011 .052 0.18 1.06 .039 .002 0.00 0.80 1.31 0.30 1.21 0.05 1.00 (0.20) .004 0.10 0.50 BSC.020 BSC A aaa C SEATING PLANE A bxN bbb C A B B e C C D LxN E E
14 2005 Semtech Corp. www.semtech.com SC613 POWER MANAGEMENT Contact Information Land Pattern- MLP-Micro 10 Outline Drawing - MLP 3x3-10 .087 .055 2.20 1.40 .150 .020 .012 .037 3.80 0.30 0.95 0.50 (.112) .075 1.90 (2.85) K H X THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. NOTES: INCHES DIMENSIONS G K H X Y P Z C DIM MILLIMETERS Y ZG(C) P Visit us at: www.semtech.com Semtech Corporation Power Management Products Division
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Phone: (805) 498-2111 FAX (805)498-3804 Contact Information