The MAX1637EEE+ from Maxim Integrated Products 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
