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.