TI LM3241

LM3241
LM3241 PRODUCT BRIEF 6MHz, 750mA Miniature, Adjustable, Step-Down DC-DC
Converter for RF Power Amplifiers
Literature Number: SNOSB38
LM3241 PRODUCT BRIEF
6MHz, 750mA Miniature, Adjustable, Step-Down DC-DC
Converter for RF Power Amplifiers
General Description
Features
The LM3241 is a DC-DC converter optimized for powering RF
power amplifiers (PAs) from a single Lithium-Ion cell; however, it may be used in many other applications. It steps down
an input voltage from 2.7V to 5.5V to an adjustable output
voltage from 0.6V to 3.4V. Output voltage is set using a VCON
analog input for controlling power levels and efficiency of the
RF PA.
The LM3241 offers three modes of operation. In PWM mode
the device operates at a fixed frequency of 6MHz (typ.) which
minimizes RF interference when driving medium-to-heavy
loads. In ECO mode, the quiescent current is reduced and
extends the battery life. Shutdown mode turns the device off
and reduces battery consumption to 0.1 µA (typ.).
The LM3241 is available in a 6-bump lead-free micro SMD
package. A high-switching frequency (6MHz) allows use of
tiny surface-mount components. Only three small external
surface-mount components, an inductor and two ceramic capacitors are required.
Notice: This document is not a datasheet. For more information regarding this product or to order samples
please contact your local National Semiconductor/Texas
Instruments sales office or visit http://www.focus.ti.com/
general/docs/dsnsuprt.tsp.
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6MHz (typ.) PWM Switching Frequency
Operates from a Single Li-Ion Cell (2.7V to 5.5V)
Adjustable Output Voltage (0.6V to 3.4V)
750 mA Maximum Load Capability
High Efficiency (95% typ. at 3.9VIN, 3.6VOUT at 500 mA)
Automatic ECO/PWM mode change
6-bump micro SMD Package
Current Overload Protection
Thermal Overload Protection
Soft Start Function
CIN and COUT are 0402 (1005) case size and 6.3V of ratedvoltage ceramic capacitor
■ Small Chip Inductor in 0805 (2012) case size
Applications
■ Battery-Powered 3G/4G RF PAs
■ Hand-Held Radios
■ RF PC Cards
Typical Application
30090401
© 2011 National Semiconductor Corporation
300904
www.national.com
LM3241 PRODUCT BRIEF
October 13, 2011
LM3241
Physical Dimensions inches (millimeters) unless otherwise noted
6-Bump Thin Micro SMD, Large Bump (0.5 mm pitch)
X1 = 1.107 mm ± 0.030 mm
X2 = 1.488 mm ±0.030 mm
X3 = 0.600 mm ±0.075 mm
NS Package Number TLA06E1A
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2
LM3241
Notes
3
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LM3241 PRODUCT BRIEF
Notes
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