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LM3279 Datenblatt(PDF) 1 Page - Texas Instruments

Teilenummer LM3279
Bauteilbeschribung  Buck-Boost Converter
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM3279 Datenblatt(HTML) 1 Page - Texas Instruments

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0
100 200 300 400 500 600 700
40
50
60
70
80
90
100
OUTPUT LOAD (mA)
PVIN = 2.7V
PVIN = 3.0V
PVIN = 3.6V
PVIN = 4.2V
1.5 ÛH
PVIN
SVIN
EN
SGND
PGND
SW1
SW2
LM3279
VOUT
FB
VCON
VOUT: 0.4V to 4.2V
10 ÛF
10 ÛF
VBATT: 2.7V to 5.5V
GPO0
GPO1
BB or
RFIC
VIO
SDATA
SCLK
DGND
RF Control
Bits
RF PA(s)
2 x 0.47 ÛF
(PA decoupling caps)
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LM3279
SNVS970C – MARCH 2013 – REVISED OCTOBER 2014
LM3279 Buck-Boost Converter With MIPI® RFFE Interface
for 3G And 4G RF Power Amplifiers
1 Features
3 Description
The LM3279 is a buck-boost DC/DC converter
1
MIPI® RFFE Digital Control Interface
designed to generate output voltages above or below
High-Efficiency PFM and PWM Modes with
a given input voltage and is particularly suitable for
Internal Seamless Transition
Power Amplifiers operating from single-cell Li-Ion
Operates from a Single Li-Ion Cell: 2.7 V to 5.5 V
batteries in portable applications.
Adjustable Output Voltage:
The LM3279 has four modes of operation: Pulse
Width
Modulation
(PWM),
Pulse
Frequency
RFFE Digital Control: 0.4 V to 4.2 V
Modulation (PFM), standby, and shutdown. During
Analog Control: 0.5 V to 4.2 V
normal conditions, the LM3279 operates in full
1-A Maximum Load Capability for VBATT ≥ 3.2 V,
synchronous PWM mode at 2.4-MHz typical switching
VOUT = 3.6 V
frequency, providing seamless transitions between
2.4-MHz (typ.) Switching Frequency
buck and boost operating regimes. Energy-saving
PFM mode increases efficiencies and current savings
Seamless Buck-Boost Mode Transition
during low-power RF transmission modes. For high-
Fast Output Voltage Transition: 0.8 V to 4 V in 20
transmit power, the device operates in PWM buck or
µs
boost mode, whereas the device can transition
High-Efficiency: 95% typ. at VBATT = 3.7 V,
between PWM and PFM modes during low-power
transmit. The LM3279 can be controlled either via an
VOUT = 3.3 V, at 300 mA
included MIPI RFFE Digital Control Interface or by
Input Overcurrent Limit
using an analog control from an external MCU,
Output Overvoltage Clamp
offering design flexibility.
Internal Compensation
The power converter topology enables minimum total
solution size by using one small footprint and case
2 Applications
size inductor and two surface mount capacitors.
3G/4G Smartphones
The LM3279 is internally compensated for buck and
RF PC Cards
boost modes of operation thus providing an optimal
transient response.
Tablets, eBooks Readers
Battery-Powered RF Devices
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3279
DSBGA (16)
2.529 mm x 2.146 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
PWM Efficiency (VOUT = 2.4 V)
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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