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TPS63021DSJT Datasheet(PDF) 15 Page - Texas Instruments

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No. de Pieza. TPS63021DSJT
Descripción  HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 4-A SWITCHES
Descarga  24 Pages
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Fabricante  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS63021DSJT Datasheet(HTML) 15 Page - Texas Instruments

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OUT
FB
V
R1 = R2 ×
- 1
V
æ
ö
ç
÷
è
ø
L1
VIN
VINA
EN
PS/SYNC
GND
L2
VOUT
FB
PGND
L
1
C2
C1
VIN
VOUT
TPS6302x
PG
Power Good
Output
C3
PS/SYNC
R1
R2
R3
(
)
IN1
OUT
s
L1 =
V
V
× 0.5 ×
A
-
OUT
s
L2 = V
× 0.5 ×
A
TPS63020
TPS63021
www.ti.com
SLVS916 – APRIL 2010
APPLICATION INFORMATION
DESIGN PROCEDURE
The TPS6302x dc/dc converters are intended for systems powered by one-cell Li-Ion or Li-Polymer battery with a
typical voltage between 2.3 V and 4.5 V. They can also be used in systems powered by a double or triple cell
Alkaline, NiCd, or NiMH battery with a typical terminal voltage between 1.8V and 5.5V . Additionally, any other
voltage source with a typical output voltage between 1.8V and 5.5V can power systems where the TPS6302x is
used.
PROGRAMMING THE OUTPUT VOLTAGE
Within the TPS6302x family there are fixed and adjustable output voltage versions available. To properly
configure the fixed output voltage devices, the FB pin is used to sense the output voltage. This means that it
must be connected directly to VOUT. For the adjustable output voltage versions, an external resistor divider is
used to adjust the output voltage. 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 500mV. The maximum
recommended value for the output voltage is 5.5V. The current through the resistor divider should be about 100
times greater than the current into the FB pin. The typical current into the FB pin is 0.01mA, and the voltage
across the resistor between FB and GND, R2, is typically 500 mV. Based on these two values, the recommended
value for R2 should be lower than 500k
Ω, in order to set the divider current at 1mA or higher. It is recommended
to keep the value for this resistor in the range of 200k
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 1:
(1)
Figure 21. Typical Application Circuit for Adjustable Output Voltage Option
INDUCTOR SELECTION
To properly configure the TPS6302x devices, an inductor must be connected between pin L1 and pin L2. To
estimate the inductance value, Equation 2 and Equation 3 can be used.
(2)
(3)
In Equation 2 the minimum inductance value, L1 for step down mode operation is calculated. VIN1 is the
Copyright © 2010, Texas Instruments Incorporated
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Product Folder Link(s): TPS63020 TPS63021


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