The MAX1637 synchronous, buck, switch-mode power-supply controller generates the CPU supply voltage in battery-powered systems. The MAX1637 is a stripped-down version of the MAX1636 in a smaller 16-pin QSOP package. The MAX1637 is intended to be powered separately from the battery by an external bias supply (typically the +5V system supply) in applications where the battery exceeds 5.5V. The MAX1637 achieves excellent DC and AC output voltage accuracy. This device can operate from a low input voltage (3.15V) and delivers the 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. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Powerful 1A on-board gate drivers ensure fast external N-channel MOSFET switching. The MAX1637 features a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. Asserting the SKIP-bar pin enables fixed-frequency mode, for lowest noise under all load conditions. For a stand-alone device that includes a +5V VL linear regulator and low-dropout capabilities, refer to the MAX1636 data sheet. Applications * Handy-Terminals, PDAs * Notebook Computers * Subnotebook Computers * ±2% DC Accuracy * 0.1% (typ) DC Load Regulation * 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) * Internal Digital Soft-Start * 1.1V ±2% Reference Output * 1µA Total Shutdown Current * Output Overvoltage Crowbar Protection * Output Undervoltage Shutdown (foldback) * Tiny 16-Pin QSOP Package https://elecena.pl/product/22317221/miniature-low-voltage-precision-step-down-controller 2022-12-27 https://elecena.pl/product/22317221/miniature-low-voltage-precision-step-down-controller 2025-01-18