LMR62421_15 Datasheet, PDF (1/32 Pages) Texas Instruments – SIMPLE SWITCHER 24Vout, 2.1A Step-Up Voltage Regulator in SOT-23

LMR62421
www.ti.com
SNVS734B – OCTOBER 2011 – REVISED APRIL 2013
LMR62421 SIMPLE SWITCHER^® 24Vout, 2.1A Step-Up Voltage Regulator in SOT-23
Check for Samples: LMR62421
FEATURES
1
•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
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.
APPLICATIONS
• Boost / SEPIC Conversions from 3.3V, 5V Rails
• Space Constrained Applications
• Embedded Systems
• LCD Displays
• LED Applications
System Performance
Efficiency vs Load Current
V_OUT = 20V
Efficiency vs Load Current
V_OUT = 12V
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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