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TPS62000-HT Datasheet(PDF) 16 Page - Texas Instruments

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No. de Pieza. TPS62000-HT
Descripción  HIGH-EFFICIENCY STEP-DOWN LOW POWER DC-DC CONVERTER
Descarga  22 Pages
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Fabricante  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS62000-HT Datasheet(HTML) 16 Page - Texas Instruments

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2
O
I
L
L
O
L(max)
O(max)
V
1
V
I
I = V
I
I
L
f
-
D
D
´
=
+
´
(4)
OUTPUT CAPACITOR SELECTION
1
2
3
O
O
I
RMS(C )
O
V
1
V
I
= V
L
f
-
´
´
´
´
(5)
O
I
O
O
O
V
1
V
1
V
= V
ESR
L
8
C
f
f
-
æ
ö
D
´
´
+
ç
÷
´
´
´
è
ø
(6)
TPS62000-HT
SLVS917A – MARCH 2009 – REVISED JUNE 2009 .......................................................................................................................................................... www.ti.com
Where:
ƒ = Switching frequency (750 kHz typical)
L = Inductor value
ΔIL = Peak-to-peak inductor ripple current
IL(max) = Maximum inductor current
The highest inductor current occurs at maximum VI.
A more conservative approach is to select the inductor current rating just for the maximum switch current of the
TPS62000 which is 1.6 A with ILIM = VIN and 900 mA with ILIM = GND. See Table 1 for recommended
inductors.
Table 1. Tested Inductors(1)
OUTPUT CURRENT
INDUCTOR VALUE
COMPONENT SUPPLIER
COMMENTS
Coilcraft DO3316P-103
Coilcraft DT3316P-103
High efficiency
Sumida CDR63B-100
0 mA to 600 mA
10
µH
Sumida CDRH5D28-100
Coilcraft DO1608C-103
Smallest solution
Sumida CDRH4D28-100
Coilcraft DO1608C-103
High efficiency
0 mA to 300 mA
10
µH
Murata LQH4C100K04
Smallest solution
(1)
Parts are valid for –40°C to 85°C.
For best performance, a low ESR output capacitor is needed. At output voltages greater than 1.8 V, ceramic
output capacitors can be used to show the best performance. Output voltages below 1.8 V require a larger output
capacitor and ESR value to improve the performance and stability of the converter.
Table 2. Capacitor Selection
OUTPUT VOLTAGE RANGE
OUTPUT CAPACITOR
OUTPUT CAPACITOR ESR
1.8 V
≤ VI ≤ 5.5 V
Co ≥ 10 µF
ESR
≤ 120 mΩ
0.8 V
≤ VI < 1.8 V
Co ≥ 47 µF
ESR > 50 m
See Table 3 for recommended capacitors.
If an output capacitor is selected with an ESR value
≤ 120 mΩ, its RMS ripple current rating always meets the
application requirements. Just for completeness, the RMS ripple current is calculated as:
The overall output ripple voltage is the sum of the voltage spike caused by the output capacitor ESR plus the
voltage ripple caused by charge and discharging the output capacitor:
Where the highest output voltage ripple occurs at the highest input voltage VI.
16
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Product Folder Link(s): TPS62000-HT


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