LMR61428_13 Datasheet, PDF (1/19 Pages) Texas Instruments – LMR61428 SIMPLE SWITCHER® 14Vout, 2.85A Step-Up Voltage Regulator in VSSOP

LMR61428
www.ti.com
SNVS815A – JUNE 2012 – REVISED APRIL 2013
LMR61428 SIMPLE SWITCHER^® 14Vout, 2.85A Step-Up Voltage Regulator in VSSOP
Check for Samples: LMR61428
FEATURES
1
•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-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 VSSOP-8 package.
System Performance
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)
Efficiency vs Load Current, V_OUT = 3.3V
80
77
74
71
68
65
62
59
56
Vin = 2.0V
Vin = 2.2V
53
Vin = 2.5V
Vin = 2.80
50
0.00 0.04 0.08 0.12 0.16 0.20
IOUT(A)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
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 © 2012–2013, Texas Instruments Incorporated