MAX796 Datasheet | Maxim Integrated

Description The MAX796/MAX797/MAX799 high-performance, stepdown DC-DC converters with single or dual outputs provide main CPU power in battery-powered systems. These buck controllers achieve 96% efficiency by using synchronous rectification and Maxim’s proprietary Idle Mode™ control scheme to extend battery life at full-load (up to 10A) and no-load outputs. Excellent dynamic response corrects output transients caused by the latest dynamic-clock CPUs within five 300k Hz clock cycles. Unique bootstrap circuitry drives inexpensive N-channel MOSFETs, reducing system cost and eliminating the crowbar switching currents found in some PMOS/NMOS switch designs. The MAX796/MAX799 are specially equipped with a secondary feedback input (SECFB) for transformer-based dual-output applications. This secondary feedback path improves cross-regulation of positive (MAX796) or negative (MAX799) auxiliary outputs. The MAX797 has a logic-controlled and synchronizable fixed-frequency pulse-width-modulating (PWM) operating mode, which reduces noise and RF interference in sensitive mobile-munications and pen-entry applications. The SKIP override input allows automatic switchover to idle-mode operation (for high-efficiency pulse skipping) at light loads, or forces fixed-frequency mode for lowest noise at all loads. The MAX796/MAX797/MAX799 are all available in 16pin DIP and narrow SO packages. See the table below to pare these three converters. PART MAX796 MAX797 MAX799 MAIN OUTPUT 3.3V/5V or adj. 3.3V/5V or adj. 3.3V/5V or adj. SPECIAL FEATURE Regulates positive secondary voltage (such as +12V) Logic-controlled low-noise mode Regulates negative secondary voltage (such as -5V) MAX796/MAX797/MAX799 ______________Ordering Information PART† MAX796CPE MAX796CSE MAX796C/D MAX796EPE MAX796ESE MAX796MJE TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO Dice- 16 Plastic DIP 16 Narrow SO 16 CERDIP Ordering...