LMR61428 Datasheet, PDF (1/16 Pages) Texas Instruments – LMR61428 SIMPLE SWITCHER® 14Vout, 2.85A Step-Up Voltage Regulator in MSOP

LMR61428
www.ti.com
SNVS815 – JUNE 2012
LMR61428 SIMPLE SWITCHER® 14Vout, 2.85A Step-Up Voltage Regulator in MSOP
Check for Samples: LMR61428
FEATURES
1
•2 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 limitting
• MSOP-8 packaging (3.0 x 5.0 x 1.09mm)
• WEBENCH® enabled
APPLICATIONS
• Boost/SEPIC conversions from 3.3V, 5V, and
12V
• Space constrained applications
• LCD displayed
• 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-duty-cycle 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 Mini-SO-8 package. This package uses half the board area of a standard 8-pin
SO and has a height of just 1.09 mm.
Performance Benefits
• Extremely easy to use
• Tiny overall solution reduces system cost
System Performance
Figure 1. Efficiency vs Load Current, V_OUT = 5V
84
82
80
78
76
74
72
70
Vin = 3.0V
Vin = 3.2V
68
Vin = 3.4V
Vin = 3.6V
66
Vin = 3.8V
Vin = 4.0V
64
0.00 0.09 0.18 0.27 0.36 0.45 0.54
IOUT(A)
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.
Copyright © 2012, Texas Instruments Incorporated