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參數(shù)資料
| 型號： | 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)： | 5/24頁 |
| 文件大小： | 603K |
| 代理商： | LTC3618EUF#TRPBF |
LTC3618
13
3618f
Operating Frequency
Selection of the operating frequency is a trade-off between
efciency and component size. High frequency operation
allows the use of smaller inductor and capacitor values.
Lower frequencies improves efciency by reducing internal
gate charge losses but requires larger inductance values
and/or capacitance to maintain low output ripple voltage.
The operating frequency of the LTC3618 is determined
by an external resistor that is connected between the RT
pin and ground. The value of the resistor sets the ramp
current that is used to charge and discharge an internal
timing capacitor within the oscillator and can be calculated
by using the following equation:
RT =
4 1011
ΩHz
fOSC
Although frequencies as high as 4MHz are possible, the
minimum on-time of the LTC3618 imposes a minimum
limit on the operating duty cycle. The minimum on-time
is typically 80ns, therefore, the minimum duty cycle is
equal to 80ns 100% fOSC(Hz)
APPLICATIONS INFORMATION
Tying the RT pin to SVIN sets the default internal operating
frequency to 2.25MHz.
The minimum on-time also limits the sinking current
capability for high switching frequency applications.
Figure 2 shows the sinking current vs switching frequency
at different input voltages.
Figure 3. Soft-Start and Compensation for VDDQ Externally Programmed,
Compensation for VTT Internally Programmed
Figure 2. Sinking Current vs Switching Frequency
FREQUENCY (MHz)
–2.0
PEAK
INDUCTOR
CURRENT
(A)
–5.0
–1.5
–1.0
–4.5
–3.0
–4.0
–3.5
–2.5
3618 G03
–0.5
5VIN
3.3VIN
2.5VIN
2.5
0
1
1.5
2
0.5
VTT = 0.9V
(2
×) SW1
FB1
VDDQIN
LTC3618
3618 F03
SGND
PGND
RUN1
TRACK/SS1
RT, 392k
ITH1
PHASE
RUN2
PGOOD2
ITH2
PGOOD1
RT
MODE/SYNC
VTTR
VIN
3.3V
SVIN (2×) PVIN1 (2×) PVIN2
1μF
47μF
1μH
47μF
VDDQ
1.8V/3A
R1
845k
R2
422k
RSS
4.7M
CSS
10nF
RC
15.8k
CC
470pF
(2
×) SW2
FB2
1μH
47μF
VTT
0.9V/±3A
10pF
0.01μF
L: VISHAY 1HLP2525BDERIROMO
10pF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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