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MAX1553 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1553 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 11 page High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs _______________________________________________________________________________________ 9 Ensure the diode’s average and peak current ratings exceed the average output current and peak inductor current. In addition, the diode’s reverse breakdown voltage must exceed VOUT. Applications Information Low Input-Voltage Applications The MAX1553/MAX1554 have minimum input voltages of 2.7V (MAX1553) and 3.15V (MAX1554). However, lower battery voltages can still be boosted for LED drive as long as VCC remains within the operating range. Since most systems have a 3.3V system supply active when the display is active and backlit, that logic supply can be used to supply VCC, while the battery power connects directly to the boost inductor. No bat- tery current is drawn when EN is low (Figure 4). PC Board Layout Due to fast-switching waveforms and high-current paths, careful PC board layout is required. An evalua- tion kit (MAX1553EVKIT) is available as an example of a proper layout. When laying out a board, minimize trace lengths between the IC and the inductor, diode, input capaci- tor, output capacitor, and R1. Keep traces short, direct, and wide. Keep noisy traces, such as the LX node trace, away from FB. Place the VCC bypass capacitor (C1) as close to the IC as possible. The ground con- nections of C1 and C2 should be as close together as possible. Star connect the grounds for R1, R3, C3, and the BRT voltage supply as close to the IC as possible. The traces from VCC to C1, from C2 to the LEDs, and from the LEDs to R1 can be longer if required. Chip Information TRANSISTOR COUNT: 740 PROCESS: BiCMOS SUPPLIER PHONE WEBSITE Central Semiconductor 631-435-1110 www.centralsemi.com Kamaya 260-489-1533 www.kamaya.com Murata 814-237-1431 www.murata.com Nichia 248-352-6575 www.nichia.com Panasonic 714-373-7939 www.panasonic.com Sumida 847-956-0666 www.sumida.com Taiyo Yuden 408-573-4150 www.t-yuden.com TDK 847-803-6100 www.component.tdk.com TOKO 847-297-0070 www.toko.com Table 1. Component Suppliers Figure 4. The MAX1553/MAX1554 can drive LEDs from battery voltages that are lower than the device operating voltage range by powering VCC from a logic supply and connecting the boost inductor to the battery. LX SS VCC FB ON OFF BRT GND BATTERY INPUT C1 4.7 µF C3 0.1 µF C2 0.47 µF OV EN WHITE LEDs C4 0.1 µF 3.3V LOGIC MAX1553 MAX1554 L1 D1 R2 R3 R1 |
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