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參數(shù)資料
| 型號(hào)： | 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)： | 6/20頁 |
| 文件大?。?/td> | 471K |
| 代理商： | LTC3617EUDD#PBF |
LTC3617
14
3617fa
The first circuit in the Typical Applications section uses
faster compensation to improve step response.
A second, more severe transient is caused by switching
in loads with large (>1μF) supply bypass capacitors. The
discharged bypass capacitors are effectively put in parallel
with COUT, causing a rapid drop in VOUT. No regulator can
alter its delivery of current quickly enough to prevent this
sudden step change in output voltage if the load switch
resistance is low and it is driven quickly. More output
capacitance may be required depending on the duty cycle
and load step requirements.
Internal Compensation
The LTC3617 provides the option to use a fixed internal
loopcompensationnetworktoreducetherequiredexternal
component count and design time. The internal loop com-
pensation network can be selected by connecting the ITH
pin to SVIN. However, selecting the internal compensation
might result in an unstable output voltage when tracking
down to 0V.
Shutdown and Soft-Start
The RUN pin provides a means to shut down the LTC3617.
Tying the RUN pin to SGND places the regulator in a low
quiescent current shutdown state (IQ < 1A).
PullingtheRUNpinhighenablestheregulatorwhichallows
an internal soft-start to slowly ramp the VTTR pin voltage
at a rate of approximately 850mV/ms. During this start-
up time, the regulator will operate in discontinuous mode
until the VTTR pin voltage exceeds approximately 0.45V.
When RUN is pulled low, the regulator will force the peak
inductor current to discharge to around 0A before shutting
off both power MOSFETs.
Output Power Good
The PGOOD output of the LTC3617 is driven by a 17Ω
(typical) open-drain pull-down MOSFET. This MOSFET
turns off approximately 3ms to 4ms after the beginning
of start-up and once the output voltage is within 5% (typi-
cal) of 0.5 VDDQIN, allowing the voltage at PGOOD to
rise via an external pull-up resistor (100k typical). If the
output voltage exits an 8% (typical) regulation window
of 0.5 VDDQIN or the VTTR pin is lower than 0.45V, the
open-drain output will pull low, thus dropping the PGOOD
pin voltage. To prevent unwanted PGOOD glitches during
transients or dynamic VOUTchanges,theLTC3617PGOOD
falling edge includes a filter time of approximately 105μs.
Efficiency Considerations
Theefficiencyofaswitchingregulatorisequaltotheoutput
power divided by the input power times 100%. It is often
useful to analyze individual losses to determine what is
limiting the efficiency and which change would produce
the most improvement. Efficiency can be expressed as:
Efficiency = 100% – (L1 + L2 + L3 + ...)
where L1, L2, etc. are the individual losses as a percent-
age of input power.
applications inForMation
Figure 5. Load Step Transient with
Internal Compensation
Figure 4. Load Step Transient with
External Compensation
VOUT
50mV/DIV
IL
2A/DIV
40s/DIV
3617 F04
VIN = 3.3V
VOUT = 1.25V
ILOAD = 100mA TO 3A
COMPENSATION FIGURE 1
VOUT
50mV/DIV
IL
2A/DIV
40s/DIV
3617 F05
VIN = 3.3V
VOUT = 1.25V
ILOAD = 100mA TO 3A
VITH = 3.3V
OUTPUT CAPACITOR VALUE FIGURE 1
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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(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 |
| 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(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 |
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