MAX1674 Maxim Integrated Products, MAX1674 Datasheet
MAX1674
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MAX1674 Summary of contents
Page 1
... The outputs can also be adjusted to other volt- ages using two external resistors. All three devices have a 0.3Ω N-channel MOSFET power switch. The MAX1674 has a 1A current limit. The MAX1675 has a 0.5A current limit, which permits the use of a smaller inductor. The MAX1676 comes in a 10-pin µ ...
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... MAX1676 (CLSEL = GND) MAX1674, MAX1676 (CLSEL = OUT GND (V = 5V) OUT MAX1675, MAX1676 (CLSEL = GND REF 100µA REF 5.5V OUT I = 100mA LX MAX1674, MAX1676 (CLSEL = OUT) MAX1675, MAX1676 (CLSEL = GND 5.5V 5.5V LX OUT = +70° +25°C.) A MIN TYP MAX UNITS 0.7 V 1.1 5.5 V 0.9 1 ...
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... CONDITIONS FB = OUT OUT FB = GND REF REF V = 1.4V 3.3V FB OUT SHDN = GND OUT 3.3V OFF FB OUT MAX1674, MAX1676 (CLSEL = OUT) LIM MAX1675, MAX1676 (CLSEL = GND) = +25°C.) A MIN TYP MAX UNITS 16 35 µA 0.1 1 µ µs 0.8 1 1.2 µs 0. ...
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High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters ELECTRICAL CHARACTERISTICS (continued) = ∞ 2V OUT -40°C to +85°C, unless otherwise noted.) (Note 4) BATT L A PARAMETER SYMBOL CLSEL Input Current I CLSEL SHDN Input ...
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... SUPPLY VOLTAGE (V) MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (V = 5V) 800 700 600 1A CURRENT LIMIT 500 400 300 200 0.5A CURRENT LIMIT 100 0 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 4.0 4.5 INPUT VOLTAGE (V) LX CURRENT LIMIT vs. OUTPUT VOLTAGE 1.2 MAX1674, MAX1676 (CLSEL = OUT) 1.0 0.8 0.6 0.4 MAX1675, MAX1676 (CLSEL = GND) 0 100 2.0 2.5 3.0 3.5 OUTPUT VOLTAGE (V) = 3.3V) OUT 4.0 4.5 5.0 5 ...
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... Dual-Mode is a trademark of Maxim Integrated Products. 6 _______________________________________________________________________________________ Typical Operating Characteristics (continued) = 0.1µ +25°C, unless otherwise noted.) REF A LOAD-TRANSIENT RESPONSE MAX1674 TOC16 3.3V OUT I OUT 200mA/div V OUT 50mV/div AC COUPLED 5µs/div NAME Dual-Mode™ Feedback Input. Connect to GND for +5.0V output. ...
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... Synchronous Rectification sec- tion for details). The internal MOSFET resistance is typi- cally 0.3Ω, which minimizes losses. The current limit of the MAX1674 and MAX1675 are 1A and 0.5A, respec- tively. The MAX1675’s lower current limit allows the use of a physically smaller inductor in space-sensitive applications ...
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High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters As a result, the synchronous rectifier significantly improves efficiency without the addition of an external component. Conversion efficiency can be as high as 94%, as shown in the Typical Operating Characteristics. For low-voltage inputs ...
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... V 5V. The input bias current of FB has a maximum value of 50nA which allows large-value resistors (R6 ≤ 260kΩ used. The MAX1674/MAX1675/MAX1676 contain an on-chip comparator for low-battery detection. If the voltage LBI falls below the internal reference voltage (1.30V), LBO (an open-drain output) sinks current to GND. The low-battery monitor threshold is set by two resistors, R3 and R4 (Figures 5, 6, and 7) ...
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... WHERE Figure 9. Adding External Hysteresis to the Low-Battery Indicator MAX1674, 500mA for the MAX1675, and 1A or 0.5A for the MAX1676. However generally acceptable to bias the inductor into saturation by as much as 20%, although this will slightly reduce efficiency. Table 1 lists - V ) REF suggested components. The inductor’ ...
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High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters Table 1. Suggested Components PRODUCTION METHOD Sumida CD43 series Sumida CD54 series Coilcraft DT1608C Surface Mount Coilcraft DO1608C Coiltronics Uni-PAC Murata LQH4 series Miniature Through-Hole Sumida RCH654-220 Table 2. Surface-Mount Inductor Specifications MANUFACTURER Ω ...
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... IC’s GND directly to the ground plane. 12 ______________________________________________________________________________________ 47µF R1 200Ω BATT LX (MAX1676) OUT R3 MAX1674 FB MAX1675 LBI MAX1676 SHDN R4 R2 100k CLSEL (MAX1676) LBO REF GND 0.1µ ...