LM8801 Datasheet | National Semiconductor

LM8801 High Precision 6MHz, 600 m A Synchronous Step-Down DC-DC Converter for Mobile Applications .. April 20, 2009 High Precision 6MHz, 600 m A Synchronous Step-Down DC-DC Converter for Mobile Applications General Description The LM8801 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell and input voltage rails from 2.3V to 5.5V. It provides up to 600 m A load current over the entire input voltage range. The LM8801 has a mode-control pin that allows the user to select continuous PWM operation over the plete load range or an auto PFM-PWM mode that changes modes automatically depending on the load. During PWM mode, the device operates at a fixed-frequency of 6 MHz (typ.). In Auto PFM-PWM mode, hysteretic PFM extends the battery life through reduction of the quiescent current during light loads and system standby. The LM8801 is available in a 6-bump micro SMD package. Only three pact external surface-mount ponents, an inductor and two capacitors, are required. Features - - - - - - - - - - - - Over 90% efficiency at 6 MHz Operation 600 m A maximum load capability 6 MHz PWM fixed switching frequency (typ.) 27 µA (typ.) quiescent current in PFM mode Wide Input Voltage Range: 2.3V to 5.5V ±1.5% DC output voltage precision over temperature Best-in-class load transient response Low output ripple in PFM mode Automatic PFM/PWM mode switching Current overload and thermal shutdown protection Internal soft-start Micro SMD 6- bump package (1.065 x 1.265 , 0.6 mm height) - Total solution size < 7mm2 (works with 0402 capacitors) - UVLO Applications - - - - - Mobile Phones MP3 players Wireless LAN PDAs, Pocket PCs Portable Hard Disk Drives Typical Application Circuit Efficiency vs. Output Current (Auto Mode, VOUT = 1.82V) © 2009 National Semiconductor Corporation .national. .. Connection Diagram and Package Mark...