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TPS610994YFFT Datasheet(PDF) 14 Page - Texas Instruments

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No. de pieza TPS610994YFFT
Descripción Electrónicos  Synchronous Boost Converter with Ultra-Low Quiescent Current
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS610994YFFT Datasheet(HTML) 14 Page - Texas Instruments

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OUT
LH
IN
OUT
IN
V
I
L
)
V
V
(
V
f
˜
˜
K
˜
˜
14
TPS61099, TPS610994, TPS610997
SLVSD88C – JULY 2016 – REVISED JANUARY 2017
www.ti.com
Product Folder Links: TPS61099 TPS610994 TPS610997
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Copyright © 2016–2017, Texas Instruments Incorporated
(1)
See Third-Party Products disclaimer
where
IL,peak is the peak inductor current.
(4)
The inductor's saturation current must be higher than the calculated peak inductor current. Table 2 lists the
recommended inductors for TPS61099x device.
After choosing the inductor, the estimated switching frequency ƒ in continuous current mode can be calculated
by Equation 5. The switching frequency is not a constant value, which is determined by L, VIN and VOUT.
(5)
Table 2. List of Inductors(1)
VOUT [V]
INDUCTANCE
[µH]
SATURATION
CURRENT [A]
DC RESISTANCE
[mΩ]
SIZE (LxWxH)
PART NUMBER
MANUFACTURER
> 3.0
2.2
1.95
80
2.5 x 2.0 x 1.2
74404024022
Würth Elektronik
2.2
1.7
92
2.5 x 2.0 x 1.1
LQH2HPN2R2MJR
muRata
2.2
1.45
163
2.0 x 1.6 x 1.0
VLS201610CX-2R2M
TDK
≤ 3.0
1.0
2.6
37
2.5 x 2.0 x 1.2
74404024010
Würth Elektronik
1.0
2.3
48
2.5 x 2.0 x 1.0
MLP2520W1R0MT0S1
TDK
1.0
1.5
80
2.0 x 1.2 x 1.0
LQM21PN1R0MGH
muRata
9.2.1.1.5
Capacitor Selection
For best output and input voltage filtering, low ESR X5R or X7R ceramic capacitors are recommended.
The input capacitor minimizes input voltage ripple, suppresses input voltage spikes and provides a stable system
rail for the device. An input capacitor value of 10 μF is normally recommended to improve transient behavior of
the regulator and EMI behavior of the total power supply circuit. A ceramic capacitor placed as close as possible
to the VIN and GND pins of the IC is recommended.
For the output capacitor of VOUT pin, small ceramic capacitors are recommended, placed as close as possible
to the VOUT and GND pins of the IC. If, for any reason, the application requires the use of large capacitors
which cannot be placed close to the IC, the use of a small ceramic capacitor with a capacitance value of 1 μF in
parallel to the large one is recommended. This small capacitor should be placed as close as possible to the
VOUT and GND pins of the IC.
From the power stage point of view, the output capacitor sets the corner frequency of the converter while the
inductor creates a Right-Half-Plane-Zero. Consequently, with a larger inductor, a larger output capacitor must be
used. The TPS61099x is optimized to work with the inductor from 1 µH to 2.2 µH, so the minimal output
capacitor value is 20 μF (nominal value). Increasing the output capacitor makes the output ripple smaller in PWM
mode.
When selecting capacitors, ceramic capacitor’s derating effect under bias should be considered. Choose the right
nominal capacitance by checking capacitor's DC bias characteristics. In this example, GRM188R60J106ME84D,
which is a 10-µF ceramic capacitor with high effective capacitance value at DC biased condition, is selected for
VOUT rail. The performance of TPS61099x is shown in Application Curves section.


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