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| CHARGE PUMP REGULATOR WITH SELECTABLE 5.0V/4.5V OUTPUT POWER MANAGEMENT Description The SC603 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 tiny ceramic bucket capacitors are required, and the inductorless implementation provides a reduced-EMI solution. Low noise mode switching circuitry and constant output current allow the use of extremely small input and output capacitors. The SC603 charge pump regulator can be used for applications that require up to 200mA of output current with a 4.5V output. The 5.0V output version provides up to 160mA of output current. Compared to a switch mode regulator, the SC603 offers a solution with less cost, area, noise and complexity. SC603 Features Small size - MLP Micro 10 lead 3x3mm package Selectable 5.0V or 4.5V output voltage 200mA available with 4.5V output 160mA available with 5.0V output Short circuit protection Soft Start function Shutdown current <2A Selectable fixed frequencies of 262kHz & 650kHz Low ripple Regulated to +/-5% Ease of use Applications Cellular phones LED photo flash for cellular phones LED backlighting PDA power supplies Portable electronics Electronic books Wireless web appliances Typical Application Circuit U1 3 Cin 1.0uF 1 4.5V or 5.0V 2 9 Cbucket1 1.0uF Cout 1.0uF UP TO 10 LEDS 10 Cbucket2 1.0uF 2.7V to 6.5V VIN VOUT CF1+ 6 EN SC603 CF1- 4 FSEL CF2+ 5 VSEL GND 8 CF2- 7 November 2, 2004 1 www.semtech.com SC603 POWER MANAGEMENT Absolute Maximum Ratings Parameter Supply Voltage Output Voltage VOUT Shor t Circuit Duration Thermal Resistance, Junction To Ambient (JESD51 Standard Method) Operating Ambient Junction Temperature Range Storage Temperature Range Peak IR Reflow Temperature SC603IMLTR Peak IR Reflow Temperature SC603IMLTRT Symbol V IN VOUT SC J A TA T JC TSTG T LE A D T LE A D Maximum -0.3 to +7.0 -0.3 to +7.0 Indefinite 31 -40 to +85 -40 to +150 -65 to +150 240 260 C/W C C C C C Units V V Electrical Characteristics Unless specified: TA = -40C to 85C, C =C IN BUCKET = 1.0F (ESR = 0.1), C OUT =1.0F (ESR = 0.1), V = 2.85V to 5.5V IN Parameter Input Supply Voltage Quiescent Current Symbol V IN IQ Conditions MI N 2.5 T YP MAX 6.5 Units V mA mA A V V mA mA mA mA mA mA Freq. = 262kHz, IOUT = 0mA, VIN = 3.7V Freq. =650kHz, IOUT = 0mA, VIN = 3.7V Enable = 0 1.0 2.1 1.4 2.8 2 Output Voltage VOUT Static Load Regulation with VSEL = 1 Static Load Regulation with VSEL = 0 4.75 4.275 5.0 4.5 5.25 4.725 150 160 190 200 60 120 Output Current IOUT VSEL = 1, 3.2V < VIN < 5.5V VSEL = 1, 3.2V < VIN < 5.5V TA = -40oC to 70oC VSEL = 0, 3.2V < VIN < 5.5V VSEL = 0, 3.2V < VIN < 5.5V TA = -40oC to 70oC VSEL=1, 2.85V < VIN < 5.5V VSEL=0, 2.85V < VIN < 5.5V 2004 Semtech Corp. 2 www.semtech.com SC603 POWER MANAGEMENT Unless specified: TA = -40C to 85C, C =C IN BUCKET = 1.0F (ESR = 0.1), C OUT =1.0F (ESR = 0.1), V = 2.85V to 5.5V IN Parameter Pump Frequency Symbol f P U MP Conditions Enable = 1, FSEL= 0 Enable = 1, FSEL = 1 Transition time from one frequency mode to any other frequency mode guaranteed by design VOUT=0V, IOUT= IIN All inp ut p ins (Enable, VSEL, FSEL) All inp ut p ins (Enable, VSEL, FSEL) All inp ut p ins (Enable, VSEL, FSEL) All inp ut p ins (Enable, VSEL, FSEL) VIN = 3.3V, VOUT = 5.0V, IOUT = 60mA Freq.=262kHz VIN = 3.3V, VOUT = 5.0V, IOUT = 60mA Freq.=650kHz freq = 262kHz, IOUT = 60mA (1), (2) MI N -15% -20% T YP 262 650 1 MAX +15% +20% Units kHz kHz Period Frequency Mode Transition Time TCLOCK Shor t Circuit Current Inp ut High Threshold Inp ut Low Threshold Inp ut High Current Inp ut Low Current Power Efficiency from Battery to Regulated Charge Pump Outp ut ISC V IH V IL I IH I IL 600 1.3 0.4 10 10 75.0 74.5 25 45 mA V V A A % % mV Outp ut Rip p le Voltage Note: V PP (1) Peak to peak output ripple voltage with COUT=CBUCKET=1F and X5R dielectric (2) Guaranteed by design (3) This device is ESD sensitive. Use of standard ESD handling precautions is required. 2004 Semtech Corp. 3 www.semtech.com SC603 POWER MANAGEMENT Pin Configuration TOP VIEW VOUT CF1+ VIN FSEL VSEL 1 2 3 4 5 T 10 CF2+ 9 CF18 GND 7 CF26 EN Ordering Information DEVICE SC603IMLTRT SC603IMLTR SC603EVB (2) PACKAGE(1) MLP-10 3x3mm MLP-10 3x3mm Evaluation Board MLP10: 3X3 10 LEAD Note: (1) Available in tape and reel only. A reel contains 3000 devices. (2) Lead free product. Pin Descriptions Pin 1 2 3 4 5 6 7 8 9 10 T Pin Name VOUT CF1+ V IN FSEL VSEL EN CF2GN D CF1CF2+ Thermal Pad Pin Function Outp ut voltage regulated to 5.0V or 4.5V Positive terminal of bucket cap acitor 1 Inp ut voltage ranging from 2.5V to 6.5V Logic inp ut for selecting the op erational frequency. FSEL= 0, freq = 262kHz; FSEL= 1, freq = 650kHz Logic inp ut for selecting the outp ut voltage. VSEL = 1, VOUT = 5V; VSEL = 0, VOUT = 4.5V Active high enable. Bias current is less than 2uA when set low. N egative terminal of bucket cap acitor 2 Ground N egative terminal of bucket cap acitor 1 Positive terminal of bucket cap acitor 2 Pad for heat sinking p urp oses. Connect to ground p lane using multip le vias. N ot connected internally. Block Diagram VIN 3 DRIVERS MODE SELECT 2 CF1+ COMPARATORS 9 CF110 CF2+ 7 CF2GND 8 TIMER VIN 5.0V or 4.5V SWITCH BLOCK EN OSC FSEL 4 VIN VOUT VREF VSEL 5 650kHz or 262kHz 1 VOUT EN 6 2004 Semtech Corp. 4 www.semtech.com SC603 POWER MANAGEMENT Applications Information Charge Pump Function for Low Ripple The SC603 uses a voltage doubler circuit which is implemented with two switched or `bucket' capactors. Most charge pump doublers use only one bucket capacitor. Two bucket capacitors switching on alternate phases greatly reduce the output ripple voltage. Over-Voltage Protection for Low Voltage Capacitors 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 advantages 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 approaches and in some cases exceeds the efficiency of a switch mode regulator. Inductors are often the largest and most expensive discrete component in a design. There are no inductors used in the SC603, so the inductor's cost and layout area are eliminated. The noise and EMF associated with the inductor are also eliminated. The SC603's fixed frequency harmonics are an advantage in portable communications equipment, such as cellular telephones. The SC603 has distinct frequencies of operation, so the harmonics 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 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 SC603 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 P 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, charge pump frequency and capacitor size are listed in Table 2 Ripple Performance. Efficiency Efficiency for the SC603 is defined as, = V IN ( 2 I O + I Q ) V O I O where VO = output voltage IO = output current VIN = input voltage IQ = quiescent current [from Electrical Characteristics on page 2] 2004 Semtech Corp. 5 www.semtech.com SC603 POWER MANAGEMENT Table 2 -Ripple Performance VOUT Freq. [kHz] 262 5.0V 650 262 650 262 4.5V 650 262 650 Iout [mA] 100 100 150 150 100 100 200 200 Ouput R ipple [mVp-p] 25 15 50 25 25 15 60 30 COUT [uF] 1 1 1 1 1 1 1 1 CBUCKET [uF] 1 1 1 1 1 1 1 1 Calculating Power Dissipation The power dissipated by the SC603 is calculated as, PD = PD = P IN - P OUT V IN 2 I O + I Q - V O I O Suggested Capacitors Table 3 is a short list of some of the manufacturers and types of multilayer ceramic capacitors that are suggested for the SC603. ( ) 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 layout should be patterned after the evaluation board gerber plots shown on page 10. The center pad "thermal slug" is not internally connected to ground, but is connected to ground in the layout through a via centered on the pad and connecting to the ground plane. Pin 8 is then 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. Table 3 -Suggested Capacitors Manufacturer AVX Panasonic TDK TDK 2004 Semtech Corp. Part Number 0805ZC105K ECJ1VB0J105K C1608X5R1A105 C1202Y5V1A106Z Capacitance[uF] 1.0 1.0 1.0 1.0 6 Dielectric Type X7R X5R X5R X5R EIA Package Size 0805 0402 0603 0805 Voltage R ating 10V 6.3V 10V 10V www.semtech.com SC603 POWER MANAGEMENT Typical Characteristics Efficiency vs. Input Voltage Efficiency vs. Line Voltage 85.0% Efficiency vs. Load Current Efficiency vs. Load 80.0% 70.0% 80.0% 75.0% 60.0% 70.0% 50.0% Efficiency [%] 5V Output, 3.8V Input 40.0% 5V Output, 3.2V Input 4.5V Output, 3.8V Input 4.5V Output, 3.2V Input 65.0% 5V, 150mA Output 60.0% 4.5V, 200mA Output 30.0% 55.0% 20.0% 50.0% 10.0% 45.0% 0.0% 40.0% 3.000 0.0 3.200 3.400 3.600 3.800 4.000 4.200 20.0 40.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 Load Current [mA] Load Regulation Load Regulation 5.000 5.000 Line Regulation Line Regulation 4.900 4.900 4.800 4.800 Output Voltage [V] 4.700 5V Output, 3.8V Input 4.5V Output, 3.8V Input 5V Output, 3.2V Input 4.5V Output, 3.2V Input Output Voltage [V] 4.700 4.600 5V, 150mA Output 4.5V, 200mA Output 4.600 4.500 4.500 4.400 4.400 4.300 4.300 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 Load Current [mA] 4.200 3.000 3.500 4.000 4.500 Input Voltage [V] 5.000 5.500 6.000 2004 Semtech Corp. 7 www.semtech.com SC603 POWER MANAGEMENT Quiescent Current Quiescent Currrent 2.500 2.300 2.100 1.900 Quiescent Current [mA] 1.700 1.500 1.300 1.100 0.900 0.700 0.500 2.700 Ripple for 150mA, 5V Output Vo=4.5, 262kHz Vo=5.0V, 262kHz Vo=4.5V, 650kHz Vo=5.0V, 650kHz 3.200 3.700 4.200 Input Voltage [V] 4.700 5.200 Startup Conditions for 4.5V Output Startup Conditions for 5.0V Output 100Hz PWM for 4.5V Application 100Hz PWM for 5.0V Application 2004 Semtech Corp. 8 www.semtech.com SC603 POWER MANAGEMENT Evaluation Board Schematic Evaluation Board Schematic The evaluation board has a monostable multivibrator circuit to provide a pulse for demonstrating the flash circuit function. Remove jumpers JP4 and JP5 to disable the timing circuit when not in use to save battery current used by R11 through the 555 IC. To adjust the pulse ontime, adjust potentiometer R11. To activate the flash circuit, depress switch S1. 2004 Semtech Corp. 9 www.semtech.com SC603 POWER MANAGEMENT Evaluation Board Bill of Materials Reference U1 C1, C2, C3, C4 C5 R1 through R10 D1 through D10 Value SC603 1.0uF 10uF Top View Comment MLP -Micro 10 lead 3x3mm. Ceramic, low ESR type, voltage of 6.3V rating is acceptable for all capacitors. This extra capacitor supports usage of long power leads from a benchtop supply. Add limiting resistors to meet the requirements of the application on 0805 pads. Add white or blue LEDs to meet the requirements of the application on 1206 pads. Bottom View Evaluation Board Gerber Plots Marking Information Top Marking 603 yyww yyww = Datecode (Example: 0452) 2004 Semtech Corp. 10 www.semtech.com SC603 POWER MANAGEMENT Outline Drawing - MLP-10 A E B DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX A A1 A2 b C D E e L N aaa bbb .031 .039 .000 .002 (.008) .007 .009 .011 .074 .079 .083 .042 .048 .052 .114 .118 .122 .020 BSC .012 .016 .020 10 .003 .004 0.80 1.00 0.00 0.05 (0.20) 0.18 0.23 0.30 1.87 2.02 2.12 1.06 1.21 1.31 2.90 3.00 3.10 0.50 BSC 0.30 0.40 0.50 10 0.08 0.10 E PIN 1 INDICATOR (LASER MARK) A aaa C A1 C A2 C SEATING PLANE Land Pattern- MLP-Micro 10 12 LxN D N e bxN bbb CAB NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS. Contact Information 2004 Semtech Corp. 11 www.semtech.com SC603 POWER MANAGEMENT Land Pattern - MLP-10 K DIM (C) H G C G H K P X Y Z DIMENSIONS INCHES MILLIMETERS (.112) .075 .055 .087 .020 .012 .037 .150 (2.85) 1.90 1.40 2.20 0.50 0.30 0.95 3.80 Z Y X 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 Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2004 Semtech Corp. 12 www.semtech.com |
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