1FEATURES
2• Over 90% Efficiency at 6 MHz Operation
• 600 mA 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
• VOUT = 1.0V to 2.9V with 50 mV steps
• ±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
• 6-bump DSBGA Package fixed–
(1.065 x 1.265 , 0.6 mm or 0.25 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

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 mA 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
complete 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 DSBGA
package. Only three compact external surface-mount
components, an inductor and two capacitors, are
required.