MAX1637EEE+

The MAX1637EEE+ is a miniature, low voltage, precision step-down controller in 16 pin QSOP package. The synchronous, buck, switch mode power supply controller generates the CPU supply voltage in battery powered systems. It is a stripped down version of MAX1636 in a smaller 16 pin QSOP package. The MAX1637 is intended to be powered separately from battery by an external bias supply (typically +5V system supply) in applications where battery exceeds 5.5V. It achieves excellent DC and AC output voltage accuracy and can operate from a low input voltage (3.15V), delivers excellent load-transient response needed by upcoming generations of dynamic-clock CPUs. Using synchronous rectification, the MAX1637 achieves up to 95% efficiency. Efficiency is greater than 80% over a 1000:1 load-current range which extends battery life in system-suspend or standby mode. It is used in notebook computers, handy-terminals, PDAs and subnotebook computers.

• ±2% DC accuracy, 0.1% (typ) DC load regulation, internal digital soft-start
• Operating temperature range from -40°C to 85°C
• Adjustable switching frequency to 350KHz
• Idle Mode™ pulse-skipping operation
• 1.10V to 5.5V adjustable output voltage
• 3.15V minimum IC supply voltage (at VCC pin)
• 1.1V ±2% reference output, 1μA total shutdown current
• Output overvoltage crowbar protection
• Output undervoltage shutdown (foldback)

Applications

Power Management

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party