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SP7648EU Datasheet(PDF) 7 Page - Sipex Corporation |
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SP7648EU Datasheet(HTML) 7 Page - Sipex Corporation |
7 / 13 page 7 Mar16-06 Rev B SP7648 Ultra-low Quiescent Current, High Efficiency Boost Regulator © 2006 Sipex Corporation For the example, a 10µH inductor would have an inductor current ripple of 350mA, while a 4.7µH inductor would have an in- ductorcurrentripplevalueof740mA.Donot allow tantalum capacitors to exceed their ripple-current ratings. An input filter capaci- tor can reduce peak currents drawn from the battery and improve efficiency. For most applications, use the same capacitor for the input and output. Low-ESR tantalum capacitors are accept- able provided they meet the ESR require- ment of 0.2 to 0.3 . In selecting an inductor, the saturation current specified for the inductor needs to be greater than the SP7648 peak current to avoid saturating the inductor, which would result in a loss of efficiency and could damage the inductor. The SP7648 evaluation board uses a Wurth 4.7µH inductor with an ISAT value of 1.7A and a DCR of 0.065 , which handles the IPEAK of 1.6A of the SP7648 and will deliver high efficiencies. Other inductors could be selected provided their ISAT is greater than the IPEAKof the SP7648. THeORY OF OPeRaTiOn VOUT Programming The SP7648 can be programmed as either a voltage source or a current source. To program the SP7648 as voltage source, the SP7648 requires 2 feedback resistors R1 & R2 to control the output voltage. To set VOUT in the voltage mode, use the equation: R1 = [(VOUT/0.8)-1] * R2, where flash < 0.4V, R1 = [(VOUT/0.288)-1] * R2, where flash > 1.0V Using the RLIM Function The peak inductor current, IPEAK, is pro grammed externally by the RLIM resistor connected between the RLIM pin and GND. The peak inductor current is defined by: IPEAK= 1600/R LIM The saturation current specified for the in- ductor needs to be greater than the peak INDUCTORS - SURFACE MOUNT Inductor Specification Inductance Manufacturer/Part No. Series R Isat Size LxWxH Inductor Type Manufacturer (uH) ohms (A) (mm) Website 4.7 Wurth Elektronik 744042004 0.070 1.70 4.8x4.8x1.8 Shielded Ferrite Core www.we-online.de 4.7 TDK SLF6025T-4R7M1R5-PF 0.031 1.50 6.0x6.0x2.5 Shielded Ferrite Core www.tdk.com 4.7 Coilcraft MSS6122-4R7MX 0.065 1.85 6.1x6.1x2.2 Shielded Ferrite Core www.coilcraft.com 6.8 Wurth Elektronik 744042006 0.080 1.50 4.8x4.8x1.8 Shielded Ferrite Core www.we-online.de 6.8 TDK SLF6025T-6R8M1R3-PF 0.044 1.30 6.0x6.0x2.5 Shielded Ferrite Core www.tdk.com 6.8 Coilcraft MSS6122-6R8MX 0.100 1.45 6.1x6.1x2.2 Shielded Ferrite Core www.coilcraft.com CAPACITORS - SURFACE MOUNT Capacitor Specification Capacitance Manufacturer/Part No. ESR Ripple Current Size LxWxH Voltage Capacitor Manufacturer (uF) ohms (max) 10C Rise (A) (mm) (V) Type Website 10 TDK C2012X5R0J106M 0.020 1.70 2.0x1.2x1.35 6.3 X5R Ceramic www.tdk.com 10 Murata GRM21BR60J106KE19L 0.020 1.70 2.0x1.2x1.35 6.3 X5R Ceramic www.murata.com MOSFETS - SURFACE MOUNT MOSFET Specification MOSFET Manufacturer/Part No. RDS(on) Id Package Manufacturer type ohms (A) Size Website NMOS Vishay Si1400DL 0.190 1.70 SC70-6 www.vishay.com NMOS Fairchild FDN337N 0.070 2.20 SOT23-3 www.fairchildsemi.com RESISTORS - LOW VALUE SURFACE MOUNT Resistor Specification Resistor Manufacturer/Part No. Resistance Pd Package Manufacturer Ref. Des. ohms (W) Size Website Rc, R2 Vishay CRCW0603R33F 0.33 0.10 0603 www.vishay.com Rc, R2 Vishay CRCW0603R22F 0.22 0.10 0603 www.vishay.com Note: Components highlighted in boldare those used on the SP7648EB Evaluation Board. 30V, Vgs = 2.5V, Pd = 0.5W MOSFET Specifications 20V, Vgs = 2.5V, Pd = 0.5W Resistor Specifications Thick Film 1% or 5% Thick Film 1% or 5% Table 1: Component Selection |
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