MAX1790

Low-Noise Step-Up DC-DC Converters

Compact, High-Efficiency Boost Converter

NOT RECOMMENDED FOR NEW DESIGNS

MAX1790, MAX8715: Typical Operating Circuit slide

MAX1790, MAX8715: Typical Operating Circuit

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Features

90% Efficiency
Adjustable Output from V_IN to 12V
1.6A, 0.21Ω, 14V Power MOSFET (MAX1790)
2.4A, 0.15Ω, 14V Power MOSFET (MAX8715)
+2.6V to +5.5V Input Range
Pin-Selectable 640kHz or 1.2MHz Switching Frequency
0.1µA Shutdown Current
Programmable Soft-Start
Small 8-Pin µMAX Package

Additional Details

The MAX1790/MAX8715 boost converters incorporate high-performance (at 1.2MHz), current-mode, fixed-frequency, pulse-width modulation (PWM) circuitry with a built-in 0.21Ω/0.15Ω n-channel MOSFET to provide a highly efficient regulator with fast response.

High switching frequency (640kHz or 1.2MHz selectable) allows easy filtering and faster loop performance. An external compensation pin provides the user flexibility in determining loop dynamics, allowing the use of small, low equivalent-series-resistance (ESR) ceramic output capacitors. The device can produce an output voltage as high as 12V from an input as low as 2.6V.

Soft-start is programmed with an external capacitor, which sets the input-current ramp rate. In shutdown mode, current consumption is reduced to 0.1µA. The MAX1790/MAX8715 are available in a space-saving 8-pin µMAX® package. The ultra-small package and high switching frequency allow the total solution to be less than 1.1mm high.

Applications