1FEATURES
2• Efficiency up to 97%
• 4V to 14V Input Voltage Range
• 1.5V to 5.0V Adjustable Output Voltage
• 0.1Ω Switch On Resistance
• 300 kHz Fixed Frequency Internal Oscillator
• 7 μA Shutdown Current
• Patented Current Sensing for Current Mode
Control
• Input Undervoltage Lockout
• Output Overvoltage Shutdown Protection
• Output Undervoltage Shutdown Protection
• Adjustable Soft-Start
• Adjustable PGOOD Delay
• Current Limit and Thermal Shutdown

APPLICATIONS
• Webpad
• Personal Digital Assistants (PDAs)
• Computer Peripherals
• Battery-Powered Devices
• Notebook Computer Video Supply
• Handheld Scanners
• GXM I/O and Core Voltage
• High Efficiency 5V Conversion

DESCRIPTION
The LM2653 switching regulator provides high
efficient power conversion over a 100:1 load range
(1.5A to 15 mA). This feature makes the LM2653 an
ideal fit in battery-powered applications.
Synchronous rectification is used to achieve up to
97% efficiency. At light loads, the LM2653 enters a
low power hysteretic or “sleep” mode to keep the
efficiency high. In many applications, the efficiency
still exceeds 80% at 15 mA load. A shutdown pin is
available to disable the LM2653 and reduce the
supply current to 7μA.
All the power, control, and drive functions are
integrated within the ICs. The ICs contain patented
current sensing circuity for current mode control. This
feature eliminates the external current sensing
resistor required by other current-mode DC-DC
converters.
The ICs have a 300 kHz fixed frequency internal oscillator. The high oscillator frequency allows the
use of extremely small, low profile components.
Protection features include thermal shutdown, input
undervoltage lockout, adjustable soft-start, cycle by
cycle current limit, output overvoltage and
undervoltage protections.