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MAX1760 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1760 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page time constant is: where RSS ≥ 470k. Placing a capacitor across the lower resistor of the cur- rent-limiting resistive divider provides both current-limit and soft-start features simultaneously (Figures 4 and 5). Inductor Selection The MAX1760’s high switching frequency allows the use of a small 3.3µH surface-mount inductor. The cho- sen inductor should generally have a saturation current rating exceeding the N-channel switch current limit; however, it is acceptable to bias the inductor current into saturation by as much as 20% if a slight reduction in efficiency is acceptable. Lower current-rated induc- tors may be used if ISET is employed to reduce the peak inductor current (see Setting the Switch Current Limit and Soft-Start). For high efficiency, choose an inductor with a high-frequency ferrite core material to reduce core losses. To minimize radiated noise, use a toroid or shielded inductor. See Table 3 for suggested components and Table 4 for a list of component suppli- ers. Connect the inductor from the battery to the LX pin as close to the IC as possible. External Diode For output voltages greater than 4V, an external Schottky diode must be connected from LX to POUT, in parallel with the on-chip synchronous rectifier (Figure 6). The diode should be rated for 0.5A. Representative devices are Motorola MBR0520L, Nihon EP05Q03L, or generic 1N5817. This external diode is also recom- mended for applications that must start with input volt- ages at or below 1.8V. The Schottky diode carries current during startup and after the synchronous rectifi- er turns off; thus, its current rating only needs to be 500mA. Connect the diode as close to the IC as possi- ble. Do not use ordinary rectifier diodes; their slow switching speeds and long reverse-recovery times ren- der them unacceptable. For circuits that do not require startup with inputs below 1.8V, and have an output of 4V or less, no external diode is needed. Input and Output Filter Capacitors Choose input and output filter capacitors that will ser- vice the input and output peak currents with accept- able voltage ripple. Choose input capacitors with working voltage ratings over the maximum input volt- tR C SS SS SS = 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter 10 ___________________________________________________ Table 3. Component Selection Guide Sanyo POSCAP series Sumida CDRH5D18 Kemet T510 series Coilcraft LPT3305 — Sumida CD43 Surface Mount AVX TPS series Coilcraft DS3316P CAPACITORS INDUCTORS PRODUCTION METHOD — Motorola MBR0520L — EIC SB series DIODES Table 4. Component Suppliers USA: 916-941-0712 EIC USA: 847-639-6400 Coilcraft USA: 847-956-0666 Japan: 011-81-3-3667-3302 Sumida USA: 843-448-9411 AVX PHONE SUPPLIER USA: 408-629-4789 Japan: 81-45-474-7030 Motorola USA: 810-287-2536 Kemet Note: Please indicate that you are using the MAX1760 when contacting these component suppliers. FB PGND GND POUT MRB0520L LX ISET OUT REF CLK/SEL VIN = 0.7V TO VOUT VOUT ON MAX1760 100 µF 3.3 µH 0.68 µF 4.7 Ω 33 µF 0.22 µF Figure 6. Connection with External Schottky Diode for Output Voltages Greater than 4V, or to Assist Low-Voltage Startup |
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