1FEATURES
2• 6μA typ. Quiescent Current
• VOUT = 3.6V to 5.7V (max VO = 5.7V)
• Operates from a Single Lithium Ion Cell (2.3V
to 5.5V)
• 8 User-selectable Output Voltages via I2C
• High-speed 3.4 MHz I2C-compatible Interface
• Up to 1.0A Maximum Load Current Capability
• 4 Levels of Current Limiting
• Auto-mode Operation and Forced PWM
• 2.5 MHz Switching Drequency (typ.)
• ±2.5% DC Output Voltage Precision
• 1.0 μH Inductor (2520 Case Size)
• 4.7 μF Input and Output Capacitors (0603 case
size)
• PGOOD Signal
• True Shutdown Isolation
• Output Over-voltage Protection
• Internal Active Voltage Balancing for
Supercapacitors
• DSBGA 9-bump Package
– (1.58 mm x 1.62 mm x 0.35 mm)(0.5 mm
pitch)

APPLICATIONS
• Flash LED
• Mobile Phones
• WiMAX
• USB
• Audio Amplifier

DESCRIPTION
LM8850 is a step-up DC-DC converter optimized for
use with a supercapacitor to protect a battery from
power surges and enable new high power
applications in mobile device architectures. The
device creates an ideal rail from 3.6V to 5.7V
boosting from a single Li-Ion cell with an input voltage
range of 2.3V to 5.5V; Target VOUT must be at least
10% higher than VIN.
An I2C interface controlling multiple output voltage
settings, input current limits, and load currents up to
1A provides superior user flexibility. The LM8850
operates in Auto mode, where the converter is in
PFM mode at light loads and switches to PWM mode
at heavy loads. Hysteretic PFM extends the battery
life by reduction of the quiescent current to 6μA (typ.)
during light load and standby conditions.
Synchronous operation provides true shutdown
isolation and improves its efficiency at medium-to-full
load conditions.