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MAX1709EUI+ Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1709EUI+ Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 14 page For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. General Description The MAX1709 sets a new standard of space savings for high-power, step-up DC-DC conversion. It delivers up to 20W at a fixed (3.3V or 5V) or adjustable (2.5V to 5.5V) output, using an on-chip power MOSFET from a +0.7V to +5V supply. Fixed-frequency PWM operation ensures that the switching noise spectrum is constrained to the 600kHz fundamental and its harmonics, allowing easy postfilter- ing for noise reduction. External clock synchronization capability allows for even tighter noise spectrum con- trol. Quiescent power consumption is less than 1mW to extend operating time in battery-powered systems. Two control inputs (ONA, ONB) allow simple push-on, push-off control through a single momentary pushbut- ton switch, as well as conventional on/off logic control. The MAX1709 also features programmable soft-start and current limit for design flexibility and optimum per- formance with batteries. The MAX1709 is supplied in both a high-power TSSOP package, which allows a 10ARMS switch current and a 4A output, and a narrow SO package, which supplies a 2.4A output with a switch rated at 6ARMS. Although the narrow SO device has a lower RMS switch rating, it has the same peak switch current rating as the TSSOP device, and so can supply 4A loads intermittently. If loads of 2A or less are required, refer to the MAX1708. ________________________Applications Routers, Servers, Workstations, Card Racks Local 2.5V to 3.3V or 5V Conversion Local 3.3V to 5V Conversion 3.6V or 5V RF PAs in Communications Handsets Features ♦ On-Chip 10A Power MOSFET ♦ 5V, 4A Output from a 3.3V Input ♦ Fixed 3.3V or 5V Output Voltage or Adjustable (2.5V to 5.5V) ♦ Input Voltage Range Down to 0.7V ♦ Low Power Consumption 1mW Quiescent Power 1µA Current in Shutdown Mode ♦ Low-Noise, Constant Frequency Operation (600kHz) ♦ Synchronizable Switching Frequency (350kHz to 1000kHz) 4A, Low-Noise, High-Frequency, Step-Up DC-DC Converter ________________________________________________________________ Maxim Integrated Products 1 28 27 26 25 24 23 22 1 2 3 4 5 6 7 ONB CLK NC LX LX LX ONA TOP VIEW MAX1709 NC PGND PGND LX LX 21 8 PGND LX 20 9 PGND NC 19 10 PGND NC 18 11 PGND GND 17 12 NC SS/ILM 16 13 FB REF 15 14 OUT GND LX TSSOP-EP* 3.3/5 Pin Configurations ONA REF SS/LIM CLK OUTPUT 3.3V, 5V, OR ADJ UP TO 4A OUT GND LX 1 μH OFF ON INPUT 1V TO 5V SYNC OR INTERNAL MAX1709 Typical Operating Circuit 19-1724; Rev 2; 4/07 EVALUATION KIT AVAILABLE Ordering Informations PART TEMP RANGE PIN-PACKAGE MAX1709ESE -40°C to +85°C 16 Narrow SO MAX1709EUI+ -40°C to +85°C 28 TSSOP-EP* + Indicates lead(Pb)-free/RoHS-compliant package. * Exposed pad. Pin Configurations continued at end of data sheet. |
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