LMR61428XMMSLASHNOPB中文资料德州仪器数据手册PDF规格书

1FEATURES

23• 1.2V to 14V Input Voltage

• Adjustable Output Voltage up to 14V

• Switch Current up to 2.85A

• Up to 2 MHz Switching Frequency

• Low Shutdown Iq, <1μA

• Cycle-by-Cycle Current Limiting

• VSSOP Packaging (3.0 x 5.0 x 1.09mm)

• WEBENCH® Enabled

PERFORMANCE BENEFITS

• Extremely Easy to Use

• Tiny Overall Solution Reduces System Cost

APPLICATIONS

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

12V

• Space Constrained Applications

• LCD Displays

• LED Applications

DESCRIPTION

The LMR61428 is a step-up DC-DC switching

regulator for battery-powered and low input voltage

systems that can achieve efficiencies up to 90%. It

has a wide input voltage range from 1.2V to 14V and

a possible regulated output voltage range of 1.24V to

14V. It has an internal 0.17Ω N-Channel MOSFET power switch.

The high switching frequency of up to 2MHz of the

LMR61428 allows for tiny surface mount inductors

and capacitors. Because of the unique constant-dutycycle

gated oscillator topology very high efficiencies

are realized over a wide load range. The supply

current is reduced to 80μA because of the BiCMOS process technology. In the shutdown mode, the

supply current is less than 2.5μA. The LMR61428 is

available in a VSSOP-8 package.