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LM3279 データシート(PDF) 3 Page - Texas Instruments

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部品番号 LM3279
部品情報  LM3279 Buck-Boost Converter with MIPI RFFE Interfacefor 3G and 4G RF Power Amplifiers
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

LM3279 データシート(HTML) 3 Page - Texas Instruments

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SCLK
GPO0
GND
VOUT
SDATA
VCON
VIO
FB
GPO1
SW2
EN
SGND
SVIN
PGND
PVIN
SW1
A
B
C
D
1
2
3
4
LM3279
www.ti.com
SNVS970A – MARCH 2013 – REVISED MAY 2013
CONNECTION DIAGRAM
Figure 1. 16-Bump Thin DSBGA Package, Large Bump
PIN DESCRIPTIONS
Pin #
Name
Description
Digital control interface (DCON) RFFE Bus clock input. Typically connected to RFFE master on RF or
A1
SCLK
Baseband IC. SCLK must be held low when VIO is not applied.
Digital control interface (DCON) RFFE Bus data input/output. Typically connected to RFFE master on RF
B1
SDATA
or Baseband IC. SDATA must be held low when VIO is not applied.
Digital control interface (DCON) 1.8V supply input. VIO functions as the RFFE interface reference
voltage. VIO also functions as a reset and enable input to LM3279. Bypass capacitor should be
C1
VIO
connected between VIO and GND. Typically connected to voltage regulator controlled by RF or Baseband
IC. When VIO = HIGH, EN shall be connected to GND.
D1
GND
Digital Ground.
Multipurpose GPIO. When VIO = HIGH, GPO0 is a general purpose output for configuring RF front end
circuitry. When the GPO0 control bit in Register 02 is set to 1, the output is driven to a 1.8V (VIO) high
A2
GPO0
logic level. The output is pulled to a low logic level when the GPO0 control bit is set to 0. (Input has an
internal pullup resistor.)
Voltage Control Analog input. When EN = HIGH, VCON controls the output voltage in PWM and PFM
B2
VCON
modes. When in Digital control, VCON can be left as no connect or connected to system ground.
Feedback input to inverting input of error amplifier. Connect output voltage directly to this node at load
C2
FB
point.
D2
VOUT
Regulated output voltage of LM3279. Connect this to a 10 µF ceramic output filter capacitor to GND.
Multipurpose GPIO. When VIO = HIGH, GPO1 is a general purpose output for configuring RF front end
circuitry. When the GPO1 control bit in Register 02 is set to 1, the output is driven to a 1.8V (VIO) high
A3
GPO1
logic level. The output is pulled to a low logic level when the GPO1 control bit is set to 0. (Input has an
internal pullup resistor.)
Enable Pin. Pulling this pin higher than 1.2V enables part to function in analog control mode. VIO must be
B3
EN
tied to ground.
C3
SGND
Signal Ground for analog circuits and control circuitry.
D3
SW2
Switch pin for Internal Power Switches M3 and M4. Connect inductor between SW1 and SW2.
A4
SVIN
SVIN is no connect. Analog supply is internally connected to PVIN.
Power MOSFET input and power current input pin. Optional low-pass filtering may help reduce radiated
B4
PVIN
EMI and noise during buck and buck-boost modes.
C4
SW1
Switch pin for Internal Power Switches M1 and M2. Connect inductor between SW1 and SW2.
D4
PGND
Power Ground for Power MOSFETs and gate drive circuitry.
Copyright © 2013, Texas Instruments Incorporated
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