SC613 Low Noise Regulated Charge Pump with Selectable Output POWER MANAGEMENT Description Features 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 implementation provides a reduced-EMI solution. Low noise mode switching circuitry and constant output current allow the use of 1uF input and output capacitors. 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 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 superior solution compared to switch mode regulator designs. 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 Cin 1.0uF 6 4 VIN EN VOUT SC613 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 February 8, 2005 1 www.semtech.com SC613 POWER MANAGEMENT Absolute Maximum Ratings Parameter Symbol Maximum Units Supply Voltage VIN -0.3 to +7.0 V Output Voltage VOUT -0.3 to +7.0 V VOUT Short 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 TJC -40 to +150 °C Storage Temperature Range TSTG -65 to +150 °C IR Reflow Temperature TLEAD 260 °C Electrical Characteristics Unless specified: TA = -40°C to 85°C, Cin=Cbucket = 1.0µF (ESR = 0.1Ω), Cout=1.0uF (ESR = 0.1Ω), Vin= 3.2V to 5.5V Parameter Symbol Input Supply Voltage VIN Quiescent Current IQ Conditions Min Typ 2.5 Maximum Output Current Pump Frequency VOUT IOUT fPUMP V 1.4 mA Freq. =650kHz, IOUT = 0mA, VIN = 3.7V 2.1 2.8 mA 2 µA Static Load Regulation with VSEL = 1 0mA < IOUT < 100mA 4.75 5.0 5.25 V Static Load Regulation with VSEL = 0 0mA < IOUT < 140mA 4.275 4.5 4.725 V VSEL = 1 100 mA VSEL = 0 140 mA Enable = 1, FSEL= 0 -15% 262 +15% kHz Enable = 1, FSEL = 1 -20% 650 +20% kHz Transition time from one frequency mode to any other frequency mode guaranteed by design Short Circuit Current ISC VOUT=0V, IOUT= IIN Input High Threshold VIH All input pins (Enable, VSEL, FSEL) Input Low Threshold VIL All input pins (Enable, VSEL, FSEL) 2005 Semtech Corp. 6.5 1.0 TLOCK Frequency Mode Transition Time Units Freq. = 262kHz, IOUT = 0mA, VIN = 3.7V Enable = 0 Output Voltage Max 2 1 Period 600 1.3 mA V 0.4 V www.semtech.com SC613 POWER MANAGEMENT Electrical Characteristics Unless specified: TA = -40°C to 85°C, Cin=Cbucket = 1.0µF (ESR = 0.1Ω), Cout=1.0uF (ESR = 0.1Ω), Vin= 3.2V to 5.5V Parameter Symbol Conditions Input High Current IIH Input Low Current IIL Power Efficiency from Battery to Regulated Charge Pump Output Output Ripple Voltage h V PP Min Typ Max Units All input pins (Enable, VSEL, FSEL) 10 µA All input pins (Enable, VSEL, FSEL) 10 µA VIN = 3.0V, VOUT = 5.0V, IOUT = 50mA Freq.=262kHz 82.5 % VIN = 3.0V, VOUT = 5.0V, IOUT = 50mA Freq.=650kHz 81.5 % freq = 262kHz, IOUT = 60mA (1), (2) 25 45 mV 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. 2005 Semtech Corp. 3 www.semtech.com SC613 POWER MANAGEMENT Pin Configuration VOUT 1 CF1+ 2 VIN 3 FSEL 4 VSEL 5 TOP VIEW T Ordering Information Device Package (1) 10 CF2+ SC613IMLTRT (2) MLP-10 3x3mm 9 CF1- S C 613E V B Evaluation Board 8 GND 7 CF2- 6 EN 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. MLP-10 3X3 LEAD Pin Descriptions Pin Pin Name 1 VOUT Output voltage regulated to 5.0V or 4.5V. 2 C F 1+ Positive terminal of bucket capacitor 1. 3 VIN Input voltage ranging from 2.5V to 6.5V. 4 FS E L Logic input for selecting the operational frequency. FSEL= 0, freq = 262kHz; FSEL= 1, freq = 650kHz. 5 VSEL Logic input for selecting the output voltage. VSEL = 1, VOUT = 5V; VSEL = 0, VOUT = 4.5V. 6 EN 7 C F 2- Negative terminal of bucket capacitor 2. 8 GND Ground. 9 C F 1- Negative terminal of bucket capacitor 1. 10 C F 2+ Positive terminal of bucket capacitor 2. T Thermal Pad 2005 Semtech Corp. Pin Function Active-high enable. Bias current is less than 2uA when set low. Pad for heat sinking purposes - not connected internally. Connect to ground plane using multiple vias. 4 www.semtech.com SC613 POWER MANAGEMENT Block Diagram VIN 3 EN 6 FSEL 4 5 SWITCH BLOCK 650kHz or 262kHz EN VSEL GND VOUT 2 CF1+ 9 CF1- 10 CF2+ 7 CF2- MODE SELECT OSC COMPARATORS VIN VOUT VREF 1 DRIVERS 54 TIMER 8 VIN 5.0V or 4.5V difficult to ensure acceptable noise performance over the entire operating range. 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 doublers use only one bucket capacitor. Two bucket capacitors switching on alternate phases greatly reduce the output ripple voltage and also reduce the size requirement for the output capacitor. 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. Over Voltage Protection The output is prevented from exceeding 6.0V. This feature allows the use of 6.3V ceramic capacitors. 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. 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. Ripple Performance Examples of the output ripple per charge pump frequency and output voltage are listed in the Ripple Performance table on page 5. Inductors are often the largest and most expensive discrete component 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. Efficiency Efficiency for the SC613 is defined as, η = The SC613’s fixed frequency harmonics are an advantage in portable communications equipment, such as cellular telephones. The SC613 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 2005 Semtech Corp. where 5 V O⋅ I O V IN⋅ ( 2⋅ I O + I Q ) VO = output voltage IO = output current VIN = input voltage IQ = quiescent current [from Electrical Characteristics on page 2]. www.semtech.com SC613 POWER MANAGEMENT Applications Information (cont.) Table 2 -Ripple Performance TA = 25°C, Cin=Cout=Cbucket = 1.0µF (ESR = 0.1Ω) Freq. [kHz ] VOUT 5.0V 4.5V Ouput Ripple [mVp-p] at 100mA and Vin= 3.2V to 5.5V 262 25 650 15 262 25 650 15 Calculating Power Dissipation The power dissipated by the SC613 is calculated as, P D = P IN − P OUT PD = 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 connecting 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 connecting 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. 2005 Semtech Corp. 6 www.semtech.com SC613 POWER MANAGEMENT Typical Characteristics Efficiency vs. Load Current Line Regulation for 4.5V Efficiency vs. Load 80.0% 4.55 4.5 70.0% 4.45 Output Voltage [V] 60.0% Efficiency [%] 50.0% 5V Output, 3.8V Input 5V Output, 3.2V Input 40.0% 4.5V Output, 3.8V Input 4.5V Output, 3.2V Input 30.0% 4.4 650kHz, 140mA 4.35 4.3 4.25 4.2 650kHz, 75mA 20.0% 4.15 10.0% 4.1 4.05 0.0% 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 2.5 Load Current [mA] 3 3.5 4 4.5 5 5.5 Input Voltage [V] Load Regulation Line Regulation for 5.0V Load Regulation 5.1 5.000 5 4.900 4.800 650kHz, 100mA Output Voltage [V] Output Voltage [V] 4.9 4.700 5V Output, 3.8V Input 4.5V Output, 3.8V Input 5V Output, 3.2V Input 4.600 4.5V Output, 3.2V Input 4.500 4.8 4.7 650kHz, 40mA 4.400 4.6 4.300 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 Load Current [mA] 4.5 2.5 3 3.5 4 4.5 5 5.5 Input Voltage [V] 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] 2005 Semtech Corp. 7 www.semtech.com SC613 POWER MANAGEMENT Start Up for 5.0V, 100mA Start Up for 4.5V, 100mA Recommended Minimum Low Pulse Width Recommended Minimum High Pulse Width Recommended Maximum 500Hz PWM Recommended Minimum 100Hz PWM 2005 Semtech Corp. 8 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 2005 Semtech Corp. 9 www.semtech.com SC613 POWER MANAGEMENT Application Schematic 2005 Semtech Corp. 10 www.semtech.com SC613 POWER MANAGEMENT Evaluation Board Bill of Materials Reference U1 C1, C2, C3, C4 C5 R1 through R10 D1 through D10 Value SC613 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. Marking Information Top Marking yyww = Datecode (Example: 0252) 2005 Semtech Corp. 11 www.semtech.com SC613 POWER MANAGEMENT Evaluation Board Gerber Plots Top View 2005 Semtech Corp. Bottom View 12 www.semtech.com SC613 POWER MANAGEMENT Land Pattern - MLP 3x3-10 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 1 .039 .031 .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 2 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. 2005 Semtech Corp. 13 www.semtech.com SC613 POWER MANAGEMENT Outline Drawing - MLP 3x3-10 K DIM H (C) G DIMENSIONS INCHES MILLIMETERS C G H K P X Y Z Z Y X (.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: Land Pattern- MLP-Micro 10 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. Contact Information Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 FAX (805)498-3804 Visit us at: www.semtech.com 2005 Semtech Corp. 14 www.semtech.com