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TPS630241YFFT Datasheet(PDF) 17 Page - Texas Instruments

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No. de Pieza. TPS630241YFFT
Descripción  High Current, High Efficiency Single Inductor Buck-Boost Converter
Descarga  29 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS630241YFFT Datasheet(HTML) 17 Page - Texas Instruments

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Input Voltage (V)
0.5
1
1.5
2
2.5
3
3.5
4
4.5
2.3
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
TPS630242
= 25 °C
TA
= - 40 °C
TA
= 85 °C
TA
Output Current (A)
45
50
55
60
65
70
75
80
85
90
95
100
100µ
1m
10m
100m
1 1.5
TPS630242
VIN = 2.8V, VOUT = 3.3V
VIN = 4.2V, VOUT = 3.3V
VIN = 3.3V, VOUT = 3.3V
VIN = 3.6V, VOUT = 3.3V
OUT
FB
V
R1 = R2 ×
- 1
V
æ
ö
ç
÷
è
ø
TPS63024
TPS630241, TPS630242
www.ti.com
SLVSCK8A – NOVEMBER 2014 – REVISED DECEMBER 2014
10.2.2.3 Capacitor Selection
10.2.2.3.1
Input Capacitor
At least a 10
μF input capacitor is recommended to improve line transient behavior of the regulator and EMI
behavior of the total power supply circuit. An X5R or X7R ceramic capacitor placed as close as possible to the
VIN and PGND pins of the IC is recommended. This capacitance can be increased without limit. If the input
supply is located more than a few inches from the TPS63024x converter additional bulk capacitance may be
required in addition to the ceramic bypass capacitors. An electrolytic or tantalum capacitor with a value of 47
μF
is a typical choice.
10.2.2.3.2
Output Capacitor
For the output capacitor, use of a small ceramic capacitors placed as close as possible to the VOUT and PGND
pins of the IC is recommended. The recommended nominal output capacitance value is 20µF with a variance as
outlined in Table 2.
There is also no upper limit for the output capacitance value. Larger capacitors causes lower output voltage
ripple as well as lower output voltage drop during load transients.
10.2.2.4 Setting The Output Voltage
When the adjustable output voltage version TPS63024x is used, the output voltage is set by an external resistor
divider. The resistor divider must be connected between VOUT, FB and GND. When the output voltage is
regulated properly, the typical value of the voltage at the FB pin is 800mV. The current through the resistive
divider should be about 10 times greater than the current into the FB pin. The typical current into the FB pin is
0.1
μA, and the voltage across the resistor between FB and GND, R2, is typically 800 mV. Based on these two
values, the recommended value for R2 should be lower than 180k
Ω, in order to set the divider current at 4μA or
higher. It is recommended to keep the value for this resistor in the range of 180k
Ω. From that, the value of the
resistor connected between VOUT and FB, R1, depending on the needed output voltage (VOUT), can be
calculated using Equation 7:
(7)
10.2.3 Application Curves
VOUT = 3.3 V
PFM/PWM = Low
Figure 5. Minimum Average Input Current vs Input Voltage
Figure 6. Efficiency vs Output Current
Copyright © 2014, Texas Instruments Incorporated
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Product Folder Links: TPS630241 TPS630242


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