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參數(shù)資料
| 型號： | TC1303A-AD3EMFTR |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| 中文描述： | 500毫安同步降壓穩(wěn)壓器，300 mA的LDO具有電源就緒輸出 |
| 文件頁數(shù)： | 23/36頁 |
| 文件大?。?/td> | 463K |
| 代理商： | TC1303A-AD3EMFTR |
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2005 Microchip Technology Inc.
DS21949B-page 23
TC1303A/TC1303B/TC1303C/TC1304
5.0
APPLICATION
CIRCUITS/ISSUES
5.1
Typical Applications
The TC1303/TC1304 500 mA buck regulator + 300 mA
LDO with power-good operates over a wide input volt-
age range (2.7V to 5.5V) and is ideal for single-cell Li-
Ion battery-powered applications, USB-powered appli-
cations, three-cell NiMH or NiCd applications and 3V to
5V regulated input applications. The 10-pin MSOP and
3X3 DFN packages provide a small footprint with
minimal external components.
5.2
Fixed Output Application
A typical V
OUT1
fixed-output voltage application is
shown in “
Typical Application Circuits”
. A 4.7 μF
V
IN1
ceramic input capacitor, 4.7 μF V
OUT1
ceramic
capacitor, 1.0 μF ceramic V
OUT2
capacitor and 4.7 μH
inductor make up the entire external component solu-
tion for this dual-output application. No external divid-
ers or compensation components are necessary. For
this application, the input voltage range is 2.7V to 4.2V,
V
OUT1
= 1.5V at 500 mA, while V
OUT2
= 2.5V at
300 mA.
5.3
Adjustable Output Application
A typical V
OUT1
adjustable output application is also
shown in “
Typical Application Circuits”
. For this
application, the buck regulator output voltage is adjust-
able by using two external resistors as a voltage
divider. For adjustable-output voltages, it is recom-
mended that the top resistor divider value be 200 k
Ω.
The bottom resistor divider can be calculated using the
following formula:
EQUATION 5-1:
Example:
For adjustable-output applications, an additional R-C
compensation is necessary for the buck regulator
control loop stability. Recommended values are:
An additional V
IN2
capacitor can be added to reduce
high-frequency noise on the LDO input voltage pin
(V
IN2
). This additional capacitor (1 μF on page 5) is not
necessary for typical applications.
5.4
Input and Output Capacitor
Selection
As with all buck-derived dc-dc switching regulators, the
input current is pulled from the source in pulses. This
places a burden on the TC1303/TC1304 input filter
capacitor. In most applications, a minimum of 4.7 μF is
recommended on V
IN1
(buck regulator input voltage
pin). In applications that have high source impedance,
or have long leads, (10 inches) connecting to the input
source, additional capacitance should be used. The
capacitor type can be electrolytic (aluminum, tantalum,
POSCAP, OSCON) or ceramic. For most portable elec-
tronic applications, ceramic capacitors are preferred
due to their small size and low cost.
For applications that require very low noise on the LDO
output, an additional capacitor (typically 1 μF) can be
added to the V
IN2
pin (LDO input voltage pin).
Low ESR electrolytic or ceramic can be used for the
buck regulator output capacitor. Again, ceramic is
recommended because of its physical attributes and
cost. For most applications, a 4.7 μF is recommended.
Refer to Table 5-1 for recommended values. Larger
capacitors (up to 22 μF) can be used. There are some
advantages in load step performance when using
larger value capacitors. Ceramic materials X7R and
X5R have low temperature coefficients and are well
within the acceptable ESR range required.
TABLE 5-1:
TC1303A, TC1303B, TC1303C,
TC1304 RECOMMENDED
CAPACITOR VALUES
R
TOP
V
OUT1
V
FB
R
BOT
R
BOT
=
=
=
=
=
200 k
Ω
2.1V
0.8V
200 k
Ω
x (0.8V/(2.1V – 0.8V))
123 k
Ω
(Standard Value = 121 k
Ω
)
R
COMP
C
COMP
=
=
4.99 k
Ω
33 pF
R
BOT
R
TOP
V
V
OUT1
V
FB
–
--------------------------------
×
=
C(V
IN1
)
4.7 μF
none
C(V
IN2
)
none
none
C
OUT1
4.7 μF
22 μF
C
OUT2
1 μF
10 μF
min
max
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC1303A-AD3EUN | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AD3EUNTR | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AE0EMF | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AE0EMFTR | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AE0EUN | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1303A-AD3EUN | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AD3EUNTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AE0EMF | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AE0EMFTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AE0EUN | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
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