1FEATURES

2• Input Voltage Range of 2.7V to 5.5V

• Output Voltage up to 24V

• Switch Current up to 2.1A

• 1.6 MHz Switching Frequency

• Low Shutdown Iq, 80 nA

• Cycle-by-Cycle Current Limiting

• Internally Compensated

• Internal Soft-Start

• 5-Pin SOT-23 (2.92 x 2.84 x 1mm) and 6-Pin

WSON (3 x 3 x 0.8 mm) Packaging

• Fully Enabled for WEBENCH® Power Designer

PERFORMANCE BENEFITS

• Extremely Easy to Use

• Tiny Overall Solution Reduces System Cost

APPLICATIONS

• Boost / SEPIC Conversions from 3.3V, 5V Rails

• Space Constrained Applications

• Embedded Systems

• LCD Displays

• LED Applications

DESCRIPTION

The LMR62421 is an easy-to-use, space-efficient

2.1A low-side switch regulator ideal for Boost and

SEPIC DC-DC regulation. It provides all the active

functions to provide local DC/DC conversion with fast-

transient response and accurate regulation in the

smallest PCB area. Switching frequency is internally set to 1.6 MHz, allowing the use of extremely small

surface mount inductor and chip capacitors while

providing efficiencies near 90%. Current-mode control

and internal compensation provide ease-of-use,

minimal component count, and high-performance

regulation over a wide range of operating conditions.

External shutdown features an ultra-low standby

current of 80 nA ideal for portable applications. Tiny

5-pin SOT-23 and 6-pin WSON packages provide

space-savings. Additional features include internal

soft-start, circuitry to reduce inrush current, pulse-by-

pulse current limit, and thermal shutdown.