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參數(shù)資料
| 型號： | LTC3617EUDD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 14 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 3 X 5 MM, LEAD FREE, PLASTIC, QFN-24 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大小： | 471K |
| 代理商： | LTC3617EUDD#PBF |
LTC3617
10
3617fa
applications inForMation
The basic LTC3617 application circuit is shown in Figure 1.
Operating Frequency
Selection of the operating frequency is a trade-off between
efficiency and component size. High frequency operation
allows the use of smaller inductor and capacitor values.
Operation at lower frequencies improves efficiency by
reducing internal gate charge losses but requires larger
inductance values and/or capacitance to maintain low
output voltage ripple.
The operating frequency of the LTC3617 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 =
3.82 1011Hz
fOSC Hz
( )
– 16k
Although frequencies as high as 4MHz are possible, the
minimum on-time of the LTC3617 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 fOSC(Hz)100%.
RUN
VDDQIN
RT
PGOOD
ITH
SGND
PGND
VIN
2.5V
VTTR
SVIN
LTC3617
SW
PVIN
CIN
22F
×4
CC
680pF
L1
0.33H
3617 F01
SYNC
VFB
COUT
100F
VOUT
1.25V
±6A
0.1F
VTTR
1.25V
±10mA
RC
10k
RT
365k
RPG
100k
CC1
10pF
(OPT)
Figure 1. 1.25V, ±6A at 1MHz from 2.5V
Tying the RT pin to SVIN sets the default internal operating
frequency to 2.25MHz ±20%.
Frequency Synchronization
The LTC3617’s internal oscillator can be synchronized to
an external frequency by applying a square wave clock
signal to the SYNC pin. During synchronization, the top
switch turn-on is locked to the falling edge of the external
frequency source. The synchronization frequency range
is 300kHz to 4MHz.
The frequency set by the resistor on the RT pin should be
the same as the external clock frequency to ensure the
internal oscillator properly adjusts when the clock signal
is applied or removed.
LTC3617
SVIN
VIN
SYNC
SGND
LTC3617
SVIN
fOSC
2.25MHz
fOSC
1/TP
fOSC ∝1/RT
LTC3617
SVIN
VIN
SYNC
SGND
VIN
SYNC
SGND
TP
1.2V
0.3V
3617 F02
RT
0.4V
RT
Figure 2. Setting Switching Frequency
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參數(shù)描述 |
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| LTC3617IUDD#PBF | 功能描述:IC REG SYNC 6A BUCK 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用: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 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
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| LTC3618EFE#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:- 標準包裝:43 系列:- 應用: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 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3618EFE#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:- 標準包裝:43 系列:- 應用: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 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3618EUF#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:- 標準包裝:43 系列:- 應用: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 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
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