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TPS61046YFFR Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza TPS61046YFFR
Descripción Electrónicos  TPS61046 28-V Output Voltage Boost Converter in WCSP Package
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Fabricante Electrónico  TI [Texas Instruments]
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TPS61046YFFR Datasheet(HTML) 11 Page - Texas Instruments

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OUT
REF
V
R1
1
R2
V
§
·

u
¨
¸
©
¹
VIN
EN
SW
VOUT
FB
GND
L1
4.72F
1.02F
R1
R2
OFF
ON
C1
C2
2.7 V ~ 4.2 V
102H
TPS61046
71.5k
1.0M
12 V
TPS61046
www.ti.com
SLVSCQ7 – APRIL 2015
9 Application and Implementation
9.1 Application Information
The TPS61046 is a boost DC-DC converter with a PWM switch, a power diode and an input/output isolation
switch integrated. The device supports up to 28-V output with the input range from 1.8 V to 5.5 V. The TPS61046
adopts the current-mode control with adaptive constant off-time. The switching frequency is quasi-constant at 1.0
MHz. The isolation switch disconnects the output from the input during shutdown to minimize leakage current.
The following design procedure can be used to select component values for the TPS61046.
9.2 Typical Application - 12-V Output Boost Converter
spacing
Figure 11. 12-V Boost Converter
9.2.1 Design Requirements
Table 1. Design Requirements
PARAMETERS
VALUES
Input Voltage
2.7 V ~ 4.2 V
Output Voltage
12 V
Output Current
50 mA
Output Voltage Ripple
±50mV
9.2.2 Detailed Design Procedure
9.2.2.1 Programming the Output Voltage
There are two ways to set the output voltage of the TPS61046. When the FB pin is connected to the input
voltage, the output voltage is fixed to 12 V. This function makes the TPS61046 only need three external
components to minimize the solution size. The second way is to use an external resistor divider to set the
desired output voltage.
By selecting the external resistor divider R1 and R2, as shown in Equation 1, the output voltage is programmed
to the desired value. When the output voltage is regulated, the typical voltage at the FB pin is VREF of 795 mV.
(1)
Copyright © 2015, Texas Instruments Incorporated
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