MAX1709

 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 1A Current in Shutdown Mode
 Low-Noise, Constant Frequency Operation (600kHz)
 Synchronizable Switching Frequency (350kHz to 1000kHz)

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

ONA, ONB, OUT, SS/LIM, 3.3/5 to GND ..............................-0.3V to +6.0V
LX to PGND .......................................................................-0.3V to +6.0V
FB, CLK, REF to GND............................................ -0.3V to (VOUT + 0.3V)
PGND to GND ...................................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
16-Pin Narrow SO (derate 16.5mW/°C above +70°C) .................1.3W
Operating Temperature Range ....................................-40°C to +85°C
Junction Temperature.................................................................+150°C
Storage Temperature ................................................-65°C to +150°C
Lead Temperature (soldering, 10s) ...........................................+300°C

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 postfiltering for noise reduction. External clock synchronization capability allows for even tighter noise spectrum control. 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 pushbutton switch, as well as conventional on/off logic control. The MAX1709 also features programmable soft-start and current limit for design flexibility and optimum performance  with batteries. The maximum RMS switch current rating is 10A. For a device with a lower current rating, smaller size, and lower cost, refer to the MAX1708 data sheet.