DESCRIPTION
The MP28162 is a high-efficiency, low
quiescent current (IQ), buck-boost converter that
operates from an input voltage (VIN) exceeding,
below, or equal to the output voltage (VOUT).
The device provides a compact solution for
products powered by single-cell Li-ion or multicell alkaline batteries, where VOUT is within the
battery voltage (VBATT) range.
Current-mode control and the fixed pulse-width
modulation (PWM) frequency provide optimal
stability and transient response. The fixed
2MHz switching frequency (fREQ) and integrated,
low on resistance (RDS(ON)) MOSFETs reduce
the solution size and maintain high efficiency.
To optimize battery life, the MP28162 employs
selectable pulse-skip mode to reduce fREQ
under light-load conditions. For low-noise
applications where pulse-skip mode may cause
interference, a high-logic input on the
MODE/SYNC pin ensures that the part
operates in fixed-frequency PWM mode under
all load conditions.
The MP28162 is available in a small WLCSP15 (1.3mmx2.1mm) package.

FEATURES
• 1.8V Minimum Start-Up Input Voltage (VIN)
• 1.2V to 5.5V Operating VIN Range
• 1.5V to 5.5V Output Voltage (VOUT) Range
• 1.5A Switching Current Limit
• 2MHz Fixed Switching Frequency (fREQ) or
External Synchronous fREQ
• Selectable Pulse-Skip Mode or Pulse-Width
Modulation (PWM) Mode
• 25μA Typical Quiescent Current (IQ)
• Load Disconnect during Shutdown
• Internal Soft Start (SS) and Compensation
• Short-Circuit Protection (SCP) with Hiccup
Mode
• Over-Temperature Protection (OTP)
• Available in a Small WLCSP-15
(1.3mmx2.1mm) Package

APPLICATIONS
• Optical Modules
• Portable Instruments
• Battery-Powered Devices