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參數(shù)資料
| 型號(hào)： | LTC3618EUF#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD, QFN-24 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 603K |
| 代理商： | LTC3618EUF#TRPBF |
LTC3618
20
3618f
Next, calculate the inductor values for approximately 1A
ripple current at maximum VIN:
L1
=
1.8V
0.9V
2.25MHz 1A
1–
5.5V
= 0.54μH
0.33μH
L2
=
2.25MHz 1A
1–
5.5V
=
Using a standard value of 0.45μH inductor for both chan-
nels results in maximum ripple currents of:
IL1 =
1.8V
0.9V
1.8V
2.25MHz 0.45μH
0.45μH
1–
5.5V
= 1.2A
0.71A
IL2 =
2.25MHz
1–
5.5V
=
COUT will be selected based on the ESR that is required to
satisfy the output voltage ripple requirement and the bulk
capacitance needed for loop stability. For this design, 47μF
ceramic capacitors will be used with X5R or X7R dielectric.
CIN should be sized for a maximum current rating of:
IRMS(MAX) =
IOUT1
2
+
I OUT2
2
= 2ARMS
Decoupling the PVIN with two 47μF X5R or X7R ceramic
capacitors is adequate for most applications.
Finally, it is possible to dene the soft-start up time choos-
ing the proper value for the capacitor and the resistor
connected to TRACK/SS1 pin. If one sets minimum TSS
= 5ms and a resistor of 4.7M, the following equation can
be solved with the maximum SVIN = 5.5V:
CSS =
5ms
4.7M In
5.5V
5.5V – 0.6V
= 9.2nF
APPLICATIONS INFORMATION
The standard value of 10nF and 4.7M guarantees the
minimum soft-start time of 5ms. In Figure 3, VDDQ shows
the schematic for this design example.
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3618:
1. A ground plane is recommended. If a ground plane
layer is not used, the signal and power grounds should
be segregated with all small signal components returning
to the SGND pin at one point which is then connected to
the PGND node at the exposed pad close to the LTC3618.
2. Connect the (+) terminal of the input capacitors, CIN,
as close as possible to the PVINx pins, and the (–) ter-
minal as close as possible to the exposed pad PGND.
This capacitor provides the AC current into the internal
power MOSFETs.
3. Keep the switching nodes, SWx, away from all sensitive
small signal nodes FBx, ITHx, RT.
4. Flood all unused areas on all layers with copper. Flooding
with copper will reduce the temperature rise of power
components. Connect the copper areas to PGND (ex-
posed pad) for best performance.
5. Connect the VFBx pins directly to the feedback resis-
tors. The resistor divider must be connected between
VOUTx and SGND.
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| LTC3618IFE#PBF | 8 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO24 |
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| LTC3618IFE#PBF | 功能描述:IC REG DUAL SYNC 3A BUCK 24TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3618IFE#TRPBF | 功能描述:IC REG DUAL SYNC 3A BUCK 24TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3618IUF#PBF | 功能描述:IC REG DUAL SYNC 3A BUCK 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3618IUF#TRPBF | 功能描述:IC REG DUAL SYNC 3A BUCK 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3619BEDD#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 10DFN 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(biāo)準(zhǔn)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 |
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