MAX1790EUA+

The MAX1790/MAX8715 are highly efficient power supplies that employ a current - mode, fixed - frequency PWM architecture for fast transient response and low - noise operation. The device regulates the output voltage through a combination of an error amplifier, two comparators, and several signal generators. The error amplifier compares the signal at FB to 1.24V and varies the COMP output. The voltage at COMP determines the current trip point each time the internal MOSFET turns on. As the load varies, the error ampl

Applications

• LCD Displays
• PCMCIA Cards
• Portable Applications
• Hand - Held Devices

Key features

• 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.
• 90% Efficiency
• Adjustable Output from VIN to 12V
• 1.6A, 0.21Ω, 14V Power MOSFET (MAX1790)
• 2.4A, 0.15Ω, 14V Power MOSFET (MAX8715)
• +2.68 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