SEMTECH SC613

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 � Small size - MLP Micro 10 lead 3x3mm package operated power supply applications. The wide input range is � Selectable 5.0V or 4.5V output voltage matched for Li-Ion battery applications. Only two 1uF ceramic � 140mA available with 4.5V output bucket capacitors are required, and the inductorless implementa- � 100mA available with 5.0V output tion provides a reduced-EMI solution. Low noise mode switching � Short circuit protection circuitry and constant output current allow the use of 1uF input � Soft Start function and output capacitors. � Shutdown current <2µA � Selectable fixed frequencies of 262kHz and 650kHz The SC613 charge pump regulator can be used for applications � Low ripple that require up to 140mA of output current with a 4.5V output. � Regulated to +/-5% The 5.0V output version provides up to 100mA of output current. � Ease of use The small package size, low component count and lower overall system cost coupled with its low noise make the SC613 a supe- Applications rior solution compared to switch mode regulator designs. � Cellular phones � LED photo flash for cellular phones � LED backlighting � PDA power supplies � Portable electronics � Electronic books Typical Application Circuit � Wireless web appliances U1 3 1 2.7V to 6.5V VIN VOUT 4.5V or 5.0V 2 Cin CF1+ Cout 1.0uF 6 1.0uF Cbucket1 EN 1.0uF 9 CF1- UP TO 10 LEDS 4 FSEL 10 CF2+ Cbucket2 5 1.0uF 7 VSEL CF2- GND 8 February 8, 2005 1 www.semtech.com SC613 SC613 POWER MANAGEMENT Absolute Maximum Ratings Pl arameter Sm ymbo Ms aximu Unit SV upply Voltage -V 0.3 to +7.0 IN OV utput Voltage -V 0.3 to +7.0 OUT VSC hort Circuit Duration Se Indefinit OUT Thermal Resistance, Junction To Ambient θ 3W 1 °C/ JA (JESD51 Standard Method) OT perating Ambient -C 40 to +85 ° A JT unction Temperature Range -C 40 to +150 ° JC ST torage Temperature Range -C 65 to +150 ° STG IT R Reflow Temperature 2C 60 ° LEAD Electrical Characteristics Unless specified: T = -40°C to 85°C, Cin=Cbucket = 1.0µF (ESR = 0.1Ω), Cout=1.0uF (ESR = 0.1Ω), Vin= 3.2V to 5.5V A Pl arameter Ss ymbo Cn ondition Mp i Tx y Ms a Unit IV nput Supply Voltage 25 .5 6V . IN QI uiescent Current Freq. = 262kHz, I = 0mA, V = 14 .0 1A . m Q OUT IN 3.7V Freq. =650kHz, I = 0mA, V = 28 .1 2A . m OUT IN 3.7V E2 nable = 0 µA OV utput Voltage Static Load Regulation with 40 .75 55 . 5V .2 OUT VSEL = 1 0mA < I < 100mA OUT Static Load Regulation with 45 .27545 . 4V .72 VSEL = 0 0mA < I < 140mA OUT MI aximum Output Current V0 SEL = 1 1A 0 m OUT V0 SEL = 0 1A 4 m Pf ump Frequency E% nable = 1, FSEL= 0 -2 15 2% 6 +z 15 kH PUMP E% nable = 1, FSEL = 1 -0 20 6% 5 +z 20 kH FT requency Mode Transition Time Transition time from one frequency 1d Perio LOCK mode to any other frequency mode guaranteed by design SI hort Circuit Current V =0V, I = I 6A 00 m SC OUT OUT IN IV nput High Threshold A3 ll input pins (Enable, VSEL, FSEL)1V . IH IL nput Low ThresholdV) IA4 ll input pins (Enable, VSEL, FSEL 0V .  2005 Semtech Corp. 2 www.semtech.com SC613 POWER MANAGEMENT Electrical Characteristics Unless specified: T = -40°C to 85°C, Cin=Cbucket = 1.0µF (ESR = 0.1Ω), Cout=1.0uF (ESR = 0.1Ω), Vin= 3.2V to 5.5V A Pl arameter Ss ymbo Cn ondition Mp i Tx y Ms a Unit II nput High CurrentA0 ll input pins (Enable, VSEL, FSEL) 1A µ IH II nput Low CurrentA0 ll input pins (Enable, VSEL, FSEL) 1A µ IL V = 3.0V, V = 5.0V, I = 50mA IN OUT OUT 8% 2.5 Freq.=262kHz Power Efficiency from Battery to h Regulated Charge Pump Output V = 3.0V, V = 5.0V, I = 50mA IN OUT OUT 8% 1.5 Freq.=650kHz (1), (2) OV utput Ripple Voltage freq = 262kHz, I = 60mA 25 5 4V m PP OUT 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 Ordering Information (1) De evice Packag (2) VOUT CF2+ SC613IMLTRT MLP-10 3x3mm 1 10 TOP VIEW Sd C613EVB Evaluation Boar CF1+ 2 9 CF1- Note: VIN GND 3 8 (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 CF2- FSEL 4 7 RoHS compliant. T VSEL56 EN MLP-10 3X3 LEAD Pin Descriptions Pe inPn in Nam Pin Functio 1TV. OU Output voltage regulated to 5.0V or 4.5V 2+C. F1 Positive terminal of bucket capacitor 1 3NV. I Input voltage ranging from 2.5V to 6.5V Logic input for selecting the operational frequency. FSEL= 0, freq = 262kHz; 4L FSE FSEL= 1, freq = 650kHz. 5L VSE Logic input for selecting the output voltage. VSEL = 1, VOUT = 5V; VSEL = 0, VOUT = 4.5V. 6NE. Active-high enable. Bias current is less than 2uA when set low 7-C. F2 Negative terminal of bucket capacitor 2 8DG. N Ground 9-C. F1 Negative terminal of bucket capacitor 1 1+ 0C. F2 Positive terminal of bucket capacitor 2 Pad for heat sinking purposes - not connected internally. Connect to ground plane using multiple Td Thermal Pa vias.  2005 Semtech Corp. 4 www.semtech.com SC613 POWER MANAGEMENT Block Diagram VIN 3 SWITCH BLOCK 1 VOUT DRIVERS 650kHz or 262kHz EN MODE EN 6 SELECT OSC 2 CF1+ 4 5 FSEL 9 CF1- COMPARATORS VIN VOUT 10 CF2+ VREF 5 4 VSEL 7 CF2- TIMER GND 8 VIN 5.0V or 4.5V difficult to ensure acceptable noise performance over the entire Applications Information operating range. Charge Pump Doubler Type The SC613 uses a voltage doubler circuit which is implemented Many switch mode regulators have increased voltage ripple on with two switched or ‘bucket’ capactors. Most charge pump dou- the output during pulse skipping mode due to the fact that there blers use only one bucket capacitor. Two bucket capacitors switch- are large periods of time when no current is supplied to the output. ing on alternate phases greatly reduce the output ripple voltage The SC613 supplies current to the output continuously, so the and also reduce the size requirement for the output capacitor. 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 Frequency Selection the use of 6.3V ceramic capacitors. 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 Comparison with Other Regulation Methods the clock to 262kHz. Input from a uP or other device may be used In many instances, a charge pump regulator is the best choice for to change the charge pump frequency at any time. The optimal portable power applications. These regulators offer many advan- frequency will depend upon the capacitor values, the load current, tages over switch mode regulators. A smaller bill of materials, and the exceptable amount of output ripple. less layout area, lower component height, less noise, no EMF, and less overall circuit cost are typical reasons to use this type of Ripple Performance regulation. The efficiency of a charge pump regulator often ap- Examples of the output ripple per charge pump frequency and proaches and in some cases exceeds the efficiency of a switch output voltage are listed in the Ripple Performance table on page mode regulator. 5. Inductors are often the largest and most expensive discrete com- Efficiency ponent in a design. There are no inductors used in the SC613, so Efficiency for the SC613 is defined as, the inductor’s cost and layout area are eliminated. The noise and V ⋅I O O EMF associated with the inductor are also eliminated. = η V ⋅ 2I⋅ + I () IN O Q The SC613’s fixed frequency harmonics are an advantage in por- table communications equipment, such as cellular telephones. where V = output voltage O The SC613 has distinct frequencies of operation, so the harmon- I = output current O ics are predictable. The harmonics are not fixed in a switch mode V = input voltage IN regulator. Switch mode regulators have harmonics which vary I = quiescent current [from Electrical Characteristics Q due to the pulse width modulation used to regulate the output. on page 2]. Varying harmonics can be a problem because it may be more  2005 Semtech Corp. 5 www.semtech.com SC613 POWER MANAGEMENT Applications Information (cont.) Table 2 -Ripple Performance T = 25°C, Cin=Cout=Cbucket = 1.0µF (ESR = 0.1Ω) A Ouput Ripple [mVp-p] Freq. V at 100mA and OUT [kHz] Vin= 3.2V to 5.5V 25 62 2 5.0V 65 50 1 25 62 2 4.5V 65 50 1 Calculating Power Dissipation The power dissipated by the SC613 is calculated as, P P − P = D IN OUT V ⋅ 2⋅I + I − V ⋅I P ( ) IN O Q O O D = 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.  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 60.0% 650kHz, 140mA 4.4 50.0% 4.35 5V Output, 3.8V Input 5V Output, 3.2V Input 40.0% 4.3 4.5V Output, 3.8V Input 4.5V Output, 3.2V Input 4.25 30.0% 4.2 650kHz, 75mA 20.0% 4.15 10.0% 4.1 0.0% 4.05 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 2.53 3.544.5 5 5.5 Load Current [mA] Input Voltage [V] Load Regulation Line Regulation for 5.0V Load Regulation 5.1 5.000 5 4.900 4.800 650kHz, 100mA 4.9 4.700 5V Output, 3.8V Input 4.5V Output, 3.8V Input 5V Output, 3.2V Input 4.8 4.600 4.5V Output, 3.2V Input 4.500 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 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 Output Voltage [V] Efficiency [%] Quiescent Current [mA] Output Voltage [V] Output Voltage [V] 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 650kHz Output Ripple on 5.0V Output at 262kHz 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 Reference Value Value Comment Comment Reference Reference Reference Value Value Value Comment Comment Comment 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. Marking Information Top Marking yyww = Datecode (Example: 0252)  2005 Semtech Corp. 11 www.semtech.com SC613 POWER MANAGEMENT Evaluation Board Gerber Plots Top View Bottom View  2005 Semtech Corp. 12 www.semtech.com SC613 POWER MANAGEMENT Land Pattern - MLP 3x3-10 DIMENSIONS A E B INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX - - A .031 .039 0.80 1.00 - - .000 .002 0.00 A1 0.05 - - - - (.008) (0.20) A2 b .007 .009 .011 0.18 0.23 0.30 E C .074 .079 .083 1.87 2.02 2.12 D .042 .048 .052 1.06 1.21 1.31 PIN 1 E .114 .118 .122 2.90 3.00 3.10 INDICATOR e .020 BSC 0.50 BSC (LASER MARK) .012 .016 .020 0.30 0.40 0.50 L N 10 10 aaa .003 0.08 bbb .004 0.10 A SEATING PLANE aaa C A1 C A2 C 1 2 LxN D N bxN e 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 DIMENSIONS K DIM INCHES MILLIMETERS (.112) (2.85) C G .075 1.90 H .055 1.40 H G (C) Z K .087 2.20 P .020 0.50 X .012 0.30 Y Y .037 0.95 X Z .150 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 Semtech Corporation Contact Information 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