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參數(shù)資料
| 型號： | LT3509EDE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.2 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | 4 X 3 MM, LEAD FREE, PLASTIC, MO-229WGED-3, DFN-14 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大?。?/td> | 271K |
| 代理商： | LT3509EDE#PBF |
LT3509
13
3509fc
APPLICATIONS INFORMATION
Figure 7. BD Tied to Regulated Output
L1
D1
COUT
VOUT
CBOOST
VBOOST –VSW VOUT
MAX VBOOST VIN VOUT
VOUT 3V
VIN
3509 F07
LT3509
GND
VIN
BD
BOOST
SW
DA
CIN
Boost Pin Considerations
Figure 7 through Figure 9 show several ways to arrange
the boost circuit. The BOOST pin must be more than 2V
above the SW pin for full efciency. For outputs of 3.3V
and higher, the standard circuit Figure 7 is best. For lower
output voltages, the boost diode can be tied to the input
Figure 8. The circuit in Figure 7 is more efcient because
the boost pin current comes from a lower voltage source.
Finally, as shown in Figure 9, the BD pin can be tied to
another source that is at least 3V. For example, if you are
generating 3.3V and 1.8V, and the 3.3V is on whenever
the 1.8V is on, the 1.8V boost diode can be connected to
the 3.3V output.
In any case, be sure that the maximum voltage at the
BOOST pin is less than 60V and the voltage difference
between the BOOST and SW pins is less than 30V.
Inductor Selection and Maximum Output Current
A good rst choice for the inductor value is:
LV
V
MHz
f
OUT
F
SW
=+
()
.
21
where VF is the voltage drop of the catch diode (~0.5V)
and L is in μH.
The inductor’s RMS current rating must be greater than the
maximum load current and its saturation current should
be at least 30% higher. For highest efciency, the series
resistance (DCR) should be less than 0.15Ω. Table 2 lists
several vendors and types that are suitable.
The current in the inductor is a triangle wave with an average
value equal to the load current. The peak switch current
is equal to the output current plus half the peak-to-peak
inductor ripple current. The LT3509 limits its switch current
in order to protect itself and the system from overcurrent
faults. Therefore, the maximum output current that the
LT3509 will deliver depends on the switch current limit,
the inductor value and the input and output voltages.
L1
D1
COUT
VOUT
CBOOST
VBOOST –VSW VIN
MAX VBOOST 2VIN
CIN
VIN
3509 F08
LT3509
GND
VIN
BD
BOOST
SW
DA
Figure 8. Supplied from VIN
L1
D1
COUT
VOUT
CBOOST
VBOOST –VSW VBD
MAX VBOOST VIN VBD
VBD 3V
CIN
VIN
VBD
3509 F09
LT3509
GND
VIN
BD
BOOST
SW
DA
Figure 9. Separate Boost Supply
相關(guān)PDF資料 |
PDF描述 |
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| LT3509EDE#TRPBF | 1.2 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO14 |
| LT3570EFE#TRPBF | 3.1 A SWITCHING REGULATOR, 2750 kHz SWITCHING FREQ-MAX, PDSO20 |
| LT3570IUF#PBF | 3.1 A SWITCHING REGULATOR, 2750 kHz SWITCHING FREQ-MAX, PQCC24 |
| LT3570EFE#PBF | 3.1 A SWITCHING REGULATOR, 2750 kHz SWITCHING FREQ-MAX, PDSO20 |
| LT3570IUF#TRPBF | 3.1 A SWITCHING REGULATOR, 2750 kHz SWITCHING FREQ-MAX, PQCC24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3509EDE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 36V, 700mA Step-Down Regulator |
| LT3509EMSE#PBF | 功能描述:IC REG BUCK ADJ 0.7A DL 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT3509EMSE#TRPBF | 功能描述:IC REG BUCK ADJ 0.7A DL 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3509EMSEPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Dual Step-Down 3.6-36V MSOP16 |
| LT3509EMSE-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 36V, 700mA Step-Down Regulator |
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