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參數(shù)資料
| 型號(hào)： | LTC3675EUFF#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC44 |
| 封裝： | 4 X 7 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-44 |
| 文件頁(yè)數(shù)： | 19/36頁(yè) |
| 文件大?。?/td> | 413K |
| 代理商： | LTC3675EUFF#TRPBF |
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LTC3675
26
3675f
Table 4. Recommended Inductors for 1A Buck Regulators and Ganged Buck 3, Buck 4 Application
PART NUMBER
L(μH)
MAX IDC (A)
MAX DCR (mΩ)
SIZE IN mm (L
× W × H) MANUFACTURER
LPS4018-222
2.2
2.8
70
4
× 4 × 1.8
Coilcraft
www.coilcraft.com
XFL4022-222
2.2
3.5
21.35
4
× 4 × 2
Coilcraft
www.coilcraft.com
LTF5022-2R2
2.2
3.2
36
5
× 5.2 × 2.2
TDK
www.tdk.com
LPS3015-222
2.2
2.0
110
3
× 3 × 1.5
Coilcraft
www.coilcraft.com
Table 5. Recommended Inductors for 500mA Buck Regulators
PART NUMBER
L(μH)
MAX IDC (A)
MAX DCR (mΩ)
SIZE IN mm (L
× W × H) MANUFACTURER
LPS3015-222
2.2
2.0
110
3
× 3 × 1.5
Coilcraft
www.coilcraft.com
MLPS3015-2R2
2.2
1.4
110
3
× 3 × 1.5
Maglayers
www.maglayers.com
MDT2520-CR2R2
2.2
1.35
90
2.5
× 2 × 1
Toko
www.toko.com
LQM2HPN2R2
2.2
1.0
120
2.5
× 2 × 1.1
Murata
www.murata.com
Switching Regulator Output Voltage and Feedback
Network
The output voltage of the switching regulators is pro-
grammed by a resistor divider connected from the switching
regulator’s output to its feedback pin and is given by VOUT
= VFB (1 + R2/R1) as shown in Figure 5. Typical values for
R1 range from 40kΩ to 1MΩ. The buck regulator transient
response may improve with optional capacitor CFF that
helps cancel the pole created by the feedback resistors
and the input capacitance of the FB pin. Experimentation
with capacitor values between 2pF and 22pF may improve
transient response.
APPLICATIONS INFORMATION
SWITCHING
REGULATOR
(BUCK, BOOST,
BUCK-BOOST)
VOUT
COUT
(OPTIONAL)
CFF
R2
R1
FB
3675 F05
+
Figure 5. Feedback Components
Buck Regulators
All four buck regulators are designed to be used with
2.2μH inductors. Tables 4 and 5 show the recommended
inductors for the 500mA and 1A buck regulators.
The input supply needs to be decoupled with a 10μF
capacitor while the output needs to be decoupled with
a 22μF capacitor for a 1A buck regulator and 10μF for a
500mA buck regulator. Refer to Capacitor Selection in the
Applications Information section for details on selecting
a proper capacitor.
EachbuckregulatorcanbeprogrammedviaI2C.Toprogram
buck regulator 1 (1A) use sub-address 01h, buck regulator 2
(1A) sub-address 02h, buck regulator 3 (500mA) sub-
address 03h and buck regulator4 (500mA) sub-address
04h. The bit format is explained in Table 6.
Combined Buck Regulators
A single 2A buck regulator is available by combining both 1A
buck regulators together. Both the 500mA buck regulators
may also be combined together to form a 1A buck regulator.
Tables 4 and 7 show the recommended inductors.
The input supply needs to be decoupled with a 22μF
capacitor while the output needs to be decoupled with
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3676EUJ#PBF | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:DP-PMIC Multifunction, PMIC For Applications Processors |
| LTC3676EUJ-1#PBF | 制造商:Linear Technology 功能描述:IC CONV I.MX6 40QFN 制造商:Linear Technology 功能描述:DP-PMIC Multifunction, PMIC For Applications Processors |
| LTC3676IUJ#PBF | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:IC CONV I.MX6 40QFN 制造商:Linear Technology 功能描述:IC POWER MANAGEMENT SOLUTION 制造商:Linear Technology 功能描述:DP-PMIC Multifunction, PMIC For Applications Processors |
| LTC3676IUJ#TRPBF | 制造商:Linear Technology 功能描述:IC CONV I.MX6 40QFN |
| LTC3676IUJ-1#PBF | 制造商:Linear Technology 功能描述:IC CONV I.MX6 40QFN 制造商:Linear Technology 功能描述:IC POWER MANAGEMENT SOLUTION 制造商:Linear Technology 功能描述:IC, POWER MANAGEMENT SOLUTION, QFN-40 |
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