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參數(shù)資料
| 型號： | TC1313-CL2EUN |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous Buck Regulator, + 300 mA LDO |
| 中文描述： | 500毫安同步降壓穩(wěn)壓器，300 mA的LDO |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 392K |
| 代理商： | TC1313-CL2EUN |
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TC1313
DS21974A-page 16
2005 Microchip Technology Inc.
5.0
APPLICATION
CIRCUITS/ISSUES
5.1
Typical Applications
The TC1313 500 mA buck regulator + 300 mA LDO
operates over a wide input-voltage range (2.7V to 5.5V)
and is ideal for single-cell Li-Ion battery-powered
applications, USB-powered applications, 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 exter-
nal 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
solution for this dual-output application. No external
dividers 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) 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 TC1313 input filter capacitor. In
most applications, a minimum of 4.7 μF is recom-
mended 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 electronic
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:
TC1313 RECOMMENDED
CAPACITOR VALUES
R
TOP
= 200 k
Ω
V
OUT1
= 2.1V
V
FB
= 0.8V
R
BOT
= 200 k
Ω
x (0.8V/(2.1V – 0.8V))
R
BOT
= 123 k
Ω
(Standard Value = 121 k
Ω
)
R
COMP
= 4.99 k
Ω
C
COMP
= 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 |
|---|---|
| TC1313-CL2EUNTR | 500 mA Synchronous Buck Regulator, + 300 mA LDO |
| TC1313-CL3EMF | 500 mA Synchronous Buck Regulator, + 300 mA LDO |
| TC1313-CL3EMFTR | 500 mA Synchronous Buck Regulator, + 300 mA LDO |
| TC1313-CL3EUN | 500 mA Synchronous Buck Regulator, + 300 mA LDO |
| TC1313-CL3EUNTR | 500 mA Synchronous Buck Regulator, + 300 mA LDO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1313-DG0EMF | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1313-DG0EMFTR | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1313-PP0EMF | 功能描述:低壓差穩(wěn)壓器 - LDO PWM LDO combo PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1313-PP0EMFTR | 功能描述:低壓差穩(wěn)壓器 - LDO PWM LDO combo PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1313-RD1EMF | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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