SC603 CHARGE PUMP REGULATOR WITH SELECTABLE 5.0V/4.5V OUTPUT POWER MANAGEMENT Description Features 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. 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 <2µA Selectable fixed frequencies of 262kHz & 650kHz Low ripple Regulated to +/-5% Ease of use Applications Compared to a switch mode regulator, the SC603 offers a solution with less cost, area, noise and complexity. Typical Application Circuit Cellular phones LED photo flash for cellular phones LED backlighting PDA power supplies Portable electronics Electronic books Wireless web appliances U1 Cin 1.0uF 6 4 VOUT VIN EN SC603 3 2.7V to 6.5V CF1+ CF1- FSEL CF2+ 5 VSEL CF2- 1 4.5V or 5.0V 2 9 Cbucket1 1.0uF Cout 1.0uF UP TO 10 LEDS 10 7 Cbucket2 1.0uF GND 8 November 2, 2004 1 www.semtech.com SC603 POWER MANAGEMENT Absolute Maximum Ratings Parameter Symbol Maximum Units Supply Voltage V IN -0.3 to +7.0 V Output Voltage VOUT -0.3 to +7.0 V VOUT Shor t Circuit Duration SC Indefinite Thermal Resistance, Junction To Ambient (JESD51 Standard Method) θJ A 31 °C/W Operating Ambient TA -40 to +85 °C Junction Temperature Range T JC -40 to +150 °C Storage Temperature Range TSTG -65 to +150 °C Peak IR Reflow Temperature SC603IMLTR T LE A D 240 °C Peak IR Reflow Temperature SC603IMLTRT T LE A D 260 °C Electrical Characteristics Unless specified: TA = -40°C to 85°C, C =C IN Parameter BUCKET = 1.0µF (ESR = 0.1Ω), C Symbol Input Supply Voltage V IN Quiescent Current IQ OUT =1.0µF (ESR = 0.1Ω), V = 2.85V to 5.5V IN Conditions MI N T YP 2.5 Output Current 2004 Semtech Corp. VOUT IOUT Units 6.5 V Freq. = 262kHz, IOUT = 0mA, VIN = 3.7V 1.0 1.4 mA Freq. =650kHz, IOUT = 0mA, VIN = 3.7V 2.1 2.8 mA 2 µA Enable = 0 Output Voltage MAX Static Load Regulation with VSEL = 1 4.75 5.0 5.25 V Static Load Regulation with VSEL = 0 4.275 4.5 4.725 V VSEL = 1, 3.2V < VIN < 5.5V 150 mA VSEL = 1, 3.2V < VIN < 5.5V TA = -40oC to 70oC 160 mA VSEL = 0, 3.2V < VIN < 5.5V 190 mA VSEL = 0, 3.2V < VIN < 5.5V TA = -40oC to 70oC 200 mA VSEL=1, 2.85V < VIN < 5.5V 60 mA VSEL=0, 2.85V < VIN < 5.5V 120 mA 2 www.semtech.com SC603 POWER MANAGEMENT Unless specified: TA = -40°C to 85°C, C =C IN Parameter Pump Frequency BUCKET = 1.0µF (ESR = 0.1Ω), C Symbol f P U MP Frequency Mode Transition Time OUT =1.0µF (ESR = 0.1Ω), V = 2.85V to 5.5V IN Conditions MI N T YP MAX Units Enable = 1, FSEL= 0 -15% 262 +15% kHz Enable = 1, FSEL = 1 -20% 650 +20% kHz TCLOCK Transition time from one frequency mode to any other frequency mode guaranteed by design Shor t Circuit Current ISC VOUT=0V, IOUT= IIN Inp ut High Threshold V IH All inp ut p ins (Enable, VSEL, FSEL) Inp ut Low Threshold V IL All inp ut p ins (Enable, VSEL, FSEL) 0.4 V Inp ut High Current I IH All inp ut p ins (Enable, VSEL, FSEL) 10 µA Inp ut Low Current I IL All inp ut p ins (Enable, VSEL, FSEL) 10 µA Power Efficiency from Battery to Regulated Charge Pump Outp ut Outp ut Rip p le Voltage Note: η V PP 1 Period 600 1.3 mA V VIN = 3.3V, VOUT = 5.0V, IOUT = 60mA Freq.=262kHz 75.0 % VIN = 3.3V, VOUT = 5.0V, IOUT = 60mA Freq.=650kHz 74.5 % freq = 262kHz, IOUT = 60mA (1), (2) 25 45 mV (1) Peak to peak output ripple voltage with COUT=CBUCKET=1µF 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 Ordering Information TOP VIEW VOUT 1 10 CF2+ CF1+ 2 9 CF1- VIN 3 8 GND FSEL 4 7 CF2- VSEL 5 T PACKAGE(1) DEVICE SC603IMLTRT (2) MLP-10 3x3mm SC603IMLTR MLP-10 3x3mm SC603EVB Evaluation Board Note: (1) Available in tape and reel only. A reel contains 3000 devices. (2) Lead free product. 6 EN MLP10: 3X3 10 LEAD Pin Descriptions Pin Pin Name Pin Function 1 VOUT Outp ut voltage regulated to 5.0V or 4.5V 2 CF1+ Positive terminal of bucket cap acitor 1 3 V IN Inp ut voltage ranging from 2.5V to 6.5V 4 FSEL Logic inp ut for selecting the op erational frequency. FSEL= 0, freq = 262kHz; FSEL= 1, freq = 650kHz 5 VSEL Logic inp ut for selecting the outp ut voltage. VSEL = 1, VOUT = 5V; VSEL = 0, VOUT = 4.5V 6 EN 7 CF2- N egative terminal of bucket cap acitor 2 8 GN D Ground 9 CF1- N egative terminal of bucket cap acitor 1 10 CF2+ Positive terminal of bucket cap acitor 2 T Thermal Pad Active high enable. Bias current is less than 2uA when set low. Pad for heat sinking p urp oses. Connect to ground p lane using multip le vias. N ot connected internally. Block Diagram VIN 3 EN 6 SWITCH BLOCK 1 VOUT DRIVERS 650kHz or 262kHz EN MODE SELECT OSC 2 CF1+ FSEL 4 COMPARATORS VIN VOUT VREF 9 CF110 CF2+ VSEL 5 7 CF2TIMER GND 8 VIN 5.0V or 4.5V 2004 Semtech Corp. 4 www.semtech.com SC603 POWER MANAGEMENT Applications Information 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 µP 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. 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. Ripple Performance Examples of the output ripple, charge pump frequency and capacitor size are listed in Table 2 Ripple Performance. 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. Efficiency Efficiency for the SC603 is defined as, η = V O⋅ I O V IN⋅ ( 2⋅ I O + I Q ) where VO = output voltage IO = output current VIN = input voltage IQ = quiescent current [from Electrical Characteristics on page 2] 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. 2004 Semtech Corp. 5 www.semtech.com SC603 POWER MANAGEMENT Table 2 -Ripple Performance VOUT Freq. [kHz] Iout [mA] 262 100 650 5.0V 4.5V Ouput R ipple [mVp-p] COUT [uF] CBUCKET [uF] 25 1 1 100 15 1 1 262 150 50 1 1 650 150 25 1 1 262 100 25 1 1 650 100 15 1 1 262 200 60 1 1 650 200 30 1 1 Calculating Power Dissipation The power dissipated by the SC603 is calculated as, PD = P IN − P OUT PD = 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 Part Number Capacitance[uF] Dielectric Type EIA Package Size Voltage R ating AVX 0805ZC105K 1.0 X7R 0805 10V Panasonic ECJ1VB0J105K 1.0 X5R 0402 6.3V TDK C1608X5R1A105 1.0 X5R 0603 10V TDK C1202Y5V1A106Z 1.0 X5R 0805 10V 2004 Semtech Corp. 6 www.semtech.com SC603 POWER MANAGEMENT Typical Characteristics Efficiency vs. Load Current Efficiency vs. Input Voltage Efficiency vs. Load Efficiency vs. Line Voltage 85.0% 80.0% 80.0% 70.0% 75.0% 60.0% 70.0% Efficiency [%] 50.0% 65.0% 5V, 150mA Output 4.5V, 200mA Output 60.0% 5V Output, 3.8V Input 5V Output, 3.2V Input 4.5V Output, 3.8V Input 4.5V Output, 3.2V Input 40.0% 30.0% 55.0% 20.0% 50.0% 10.0% 45.0% 0.0% 0.0 40.0% 3.000 3.200 3.400 3.600 3.800 4.000 20.0 40.0 60.0 4.200 80.0 100.0 120.0 140.0 160.0 180.0 200.0 Load Current [mA] Line Regulation Load Regulation Load Regulation Line Regulation 5.000 5.000 4.900 4.900 4.800 4.700 5V Output, 3.8V Input 4.600 4.5V Output, 3.8V Input 5V Output, 3.2V Input 4.5V Output, 3.2V Input Output Voltage [V] Output Voltage [V] 4.800 4.700 5V, 150mA Output 4.600 4.5V, 200mA Output 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 4.200 3.000 200.0 Load Current [mA] 2004 Semtech Corp. 3.500 4.000 4.500 5.000 5.500 6.000 Input Voltage [V] 7 www.semtech.com SC603 POWER MANAGEMENT Ripple for 150mA, 5V Output Quiescent Current Quiescent Currrent 2.500 2.300 2.100 Quiescent Current [mA] 1.900 1.700 Vo=4.5, 262kHz Vo=5.0V, 262kHz 1.500 Vo=4.5V, 650kHz Vo=5.0V, 650kHz 1.300 1.100 0.900 0.700 0.500 2.700 3.200 3.700 4.200 4.700 5.200 Input Voltage [V] 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 - 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. Evaluation Board Gerber Plots Top View Bottom View 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 DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX B A A1 A2 b C D E e L N aaa bbb E PIN 1 INDICATOR (LASER MARK) A aaa C A1 C Land Pattern- MLP-Micro 1 2 10 .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 SEATING PLANE C A2 LxN D N e bxN bbb C A B 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 H (C) G C G H K P X Y Z Z Y X 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 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