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MAX1626C/D Datasheet(PDF) 13 Page - Maxim Integrated Products |
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MAX1626C/D Datasheet(HTML) 13 Page - Maxim Integrated Products |
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13 / 16 page  MAX1626/MAX1627 5V/3.3V or Adjustable, 100% Duty-Cycle, High-Efficiency, Step-Down DC-DC Controllers Maxim Integrated | 13 www.maximintegrated.com the current-sense resistor value by 50% when substitut- ing for the MAX649 or MAX651. Applications The MAX1626/MAX1627 typical operating circuits (Figures 1 and 8) are designed to output 2A at a 5V output voltage. The following circuits provide examples and guidance for other applications. Micropower Step-Down Converter When designing a low-power, battery-based applica- tion, choose an external MOSFET with low gate capaci- tance (to minimize switching losses), and use a low peak current limit to reduce I2R losses. The circuit in Figure 9 is optimized for 0.5A. High-Current Step-Down Converter The circuit in Figure 10 outputs 6A at 2.5V from a 5V or 3.3V input. High-current design is difficult, and board layout is critical due to radiated noise, switching tran- sients, and voltage gradients on the PC board traces. Figure 11 is a recommended PC board design. Choose the external MOSFET to minimize RDS(ON). Keep the gate-charge factor below the MAX1626/MAX1627’s drive capability (see Ext Rise and Fall Times vs. Capacitance graph in the Typical Operating Characteristics). Otherwise, increased MOSFET rise and fall times will contribute to efficiency losses. For higher efficiencies, especially at low output voltages, the MAX796 family of step-down controllers with syn- chronous rectification is recommended. MAX1627 C5 0.47 μF P D1 RSENSE 0.15 Ω U1 LOGIC-LEVEL MOSFET C4 0.1 μF OUT N.C. SHDN REF V+ EXT CS GND FB INPUT L1 22 μH, 3A R3 R2 CR2 C1 220 μF LOW-ESR TANTALUM C2 68 μF LOW-ESR TANTALUM C3 68 μF LOW-ESR TANTALUM L1: SUMIDA CDRH125-220 D1: NIHON NSQ03A03 U1: MOTOROLA MMSF3P02HD ADJUSTABLE OUTPUT Figure 8. MAX1627 Typical Operating Circuit MAX1626 C3 0.47 μF P D1 RSENSE 0.15 Ω U1 LOGIC-LEVEL MOSFET C4 0.1 μF 3/5 SHDN REF V+ EXT CS GND OUT INPUT L1 68 μH, 0.7A OUTPUT C1 100 μF LOW-ESR TANTALUM C2 68 μF LOW-ESR TANTALUM L1: SUMIDA CDR1053-680 D1: MOTOROLA MBRS130T3 U1: MOTOROLA MMSF3P02HD Figure 9. 0.5A Step-Down Converter MAX1627 P OUTPUT 2.5V, 6A R3 21.5k, 1% R2 20k, 1% D1 CR2 220pF Q1 LOGIC-LEVEL MOSFET C10 0.1 μF OUT 3V TO 6V SHDN N.C. REF V+ EXT CS GND FB INPUT L1 2.7 μH >8A C4 100 μF C5 100 μF C9 1.0 μF RCS1, RCS2 0.025 Ω C8 1.0 μF C7 0.1 μF C3 220 μF C2 220 μF C1 220 μF C6 0.1 μF C1–C3: SANYO OS-CON 220 μF, 6.3V C4, C5: SANYO OS-CON 100 μF,20V RCS1, RCS2: 0.025 Ω DALE WSL-2512 Q1: MOTOROLA MTB50PO3HDL D1: NIEC C10T04Q L1: SUMIDA CDRH127-2R7NC Figure 10. 6A Step-Down Converter |
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