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TPS61252DGST Datasheet(PDF) 13 Page - Texas Instruments

No. de Pieza. TPS61252DGST
Descripción  TPS61252 Tiny 1.5-A Boost Converter With Adjustable Input Current Limit
Descarga  27 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS61252DGST Datasheet(HTML) 13 Page - Texas Instruments

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ILIM
LIM
1.0V
R
10,000
I
=
g
1
OUT
FB
2
R
V
V
1
R
æ
ö
=
+
ç
÷
è
ø
g
TPS61252
www.ti.com
SLVSAG3A – SEPTEMBER 2010 – REVISED DECEMBER 2014
Table 2. Design Parameters
PARAMETER
VALUE
UNIT
VIN
Input Voltage
3.6
V
VIN(min)
Minimum Input Voltage
2.6
V
VOUT
Output Voltage
5.0
V
ILIM
Input Current Limit set by RILIM
1000
mA
VFB
Feedback Voltage
1.2
V
f
Switching Frequency
3.25
MHz
η
Estimated Efficiency
90
%
L1
Inductor Value of Choice
1.0
µH
11.2.2 Detailed Design Procedure
Table 3. List of Components
REFERENCE
DESCRIPTION
MANUFACTURER
U1
TPS61252
Texas Instruments
L1
1.0
μH, 2.1 A, 27 mΩ, 2.8 mm x 2.8
DEM2815C, TOKO
mm x 1.5 mm
C1
1 x 4.7
μF, 10 V, 0805, X7R ceramic
GRM21BR71A475KA73, Murata
C2
1 x 100 pF, 50 V, 0603, COG
GRM1885C1H101JA01B, Murata
ceramic
C3
2 × 22
μF, 10 V, 0805, X7R ceramic
GRM21BR61A226ME51, Murata
R1
Depending on the output voltage of TPS61252, 1%, (all measurements with 5 V output voltage uses 768 k
Ω)
R2
Depending on the output voltage of TPS61252, 1%, (all measurements with 5 V output voltage uses 243 k
Ω)
R3
Depending on the input current limit of TPS61252, 1%
R4
1 M
Ω, 1%
any
11.2.2.1 Output Voltage Setting
The output voltage is calculated by Equation 5:
(5)
To minimize the current through the feedback divider network, R2 should be between 180 k
Ω and 360 kΩ. The
sum of R1 and R2 should not exceed ~1 M
Ω, to keep the network robust against noise. For the example, R1 is
768 k
Ω and R2 is 243 kΩ.
An external feed forward capacitor C1 is required for optimum load transient response. The value of C1 should
be 100 pF. The connection from the FB pin to the resistor divider should be kept short and away from noise
sources, such as the inductor or the SW line.
11.2.2.2 Input Current Limit
The input current limit is set by selecting the correct external resistor value. Equation 6 is a guideline for selecting
the correct resistor value:
(6)
For a current limit of 1 A, the resistor value is 10 k
Ω.
To allow maximum current limit the ILIM pin can be directly connected to VIN.
11.2.2.3 Maximum Output Current
The maximum output current is set by RILIM and the input to output voltage ratio and can be calculated by
Equation 7:
Copyright © 2010–2014, Texas Instruments Incorporated
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