MAX798 Datasheet | Maxim Integrated

Description The high-performance, step-down DC-DC converter provides main CPU power in battery-powered systems. This buck controller achieves 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. The MAX798’s high accuracy meets the demanding requirements of the latest-generation CPUs. 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 MAX798 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. MAX798† ____________________________Features o 96% Efficiency o 4.5V to 30V Input Range o 1.6V to 6V Adjustable Precision Output o o o o o ±0.4% Max Total Load-Regulation Error 0.06%/V Max Line-Regulation Error 5V Linear-Regulator Output Precision 2.505V Reference Output Automatic Bootstrap Circuit MAX798 o 150k Hz/300k Hz Fixed-Frequency PWM Operation o Programmable Soft-Start o 1.2m A Typical Quiescent Current (VIN = 12V, VOUT = 2.5V) o 1µA Typical Shutdown Current ______________Ordering Information PART MAX798ESE TEMP. RANGE -40°C to +85°C PIN-PACKAGE 16 Narrow SO ________________________Applications Notebook and Subnotebook puters PDAs and Mobile municators __________Typical Operating Circuit INPUT 4.5V TO 30V __________________Pin Configuration TOP VIEW V+ VL BST N 5V, 25m A 4.7µF SS 1 SKIP 2 REF 3 GND 4 SYNC 5 SHDN 6 FB 7 CSH 8 16 DH 15 LX 14 BST DH 0.1µF LX ON SHDN...