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LM3242TMX/NOPB Datasheet(PDF) 1 Page - Texas Instruments

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Part # LM3242TMX/NOPB
Description  750mA Miniature Adjustable Step-Down DC-DC Converter
Download  32 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3242TMX/NOPB Datasheet(HTML) 1 Page - Texas Instruments

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FB
EN
VIN
VCON
SW
VIN
2.7V to 5.5V
0.4V to 3.6V
10 PF
4.7 PF
PGND
0.5 PH
LM3242
VOUT = 2.5 x VCON
BPEN
SGND
DAC
GPO1
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LM3242
SNOSB48E – OCTOBER 2011 – REVISED AUGUST 2015
LM3242 6-MHz, 750-mA Miniature Adjustable Step-Down DC-DC Converter With Auto
Bypass for RF Power Amplifiers
1 Features
3 Description
The LM3242 is a DC-DC converter optimized for
1
2.7-V to 5.5-V Input Voltage Operating From
powering RF power amplifiers (PAs) from a single
Single Li-Ion Cell
lithium-ion cell; however, it may be used in many
6-MHz (typical) PWM Switching Frequency
other applications. It steps down an input voltage
0.4-V to 3.6-V Adjustable Output Voltage
from 2.7 V to 5.5 V to an adjustable output voltage
from 0.4 V to 3.6 V. Output voltage is set using a
750-mA Maximum Load Capability
VCON analog input for controlling power levels and
(up to 1 A in Bypass)
efficiency of the RF PA.
High Efficiency (95% typical at 3.9 VIN,
The LM3242 offers five modes of operation. In PWM
3.3 VOUT at 500 mA)
mode the device operates at a fixed frequency of
Automatic ECO/PWM/BP Mode Change
6 MHz (typical) which minimizes RF interference
Current Overload Protection
when driving medium-to-heavy loads. At light load,
the device enters into ECO mode automatically and
Thermal Overload Protection
operates with reduced switching frequency. In ECO
Soft-Start Function
mode, the quiescent current is reduced and extends
Small Chip Inductor in 0805 (2012) case size
the battery life. Shutdown mode turns the device off
and reduces battery consumption to 0.1 µA (typical).
2 Applications
In low-battery condition Bypass mode reduces the
voltage dropout to less than 50 mV (typical). The part
Battery-Powered 3G/4G RF PAs
also features a Sleep mode.
Battery-Powered RF Devices
The LM3242 is available in a 9-bump lead-free
Hand-Held Radios
DSBGA package. A high switching frequency (6 MHz)
RF PC Cards
allows
use
of
only
three
tiny
surface-mount
components:
one
inductor
and
two
ceramic
capacitors.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3242
DSBGA (9)
1.51 mm × 1.385 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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