參數(shù)資料
型號(hào)： LTC3614EUDD#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 10.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 3 X 5 MM, LEAD FREE, PLASTIC, QFN-24
文件頁(yè)數(shù)： 10/30頁(yè)
文件大小： 438K
代理商： LTC3614EUDD#PBF
LTC3614
18
3614fa
The rst 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.
AVP Mode
Fast load transient response, limited board space and low
cost are typical requirements of microprocessor power
supplies. A microprocessor will typically exhibit full load
steps with very fast slew rate. The voltage at the micro-
processor must be held to about ±0.1V of nominal in spite
of these load current steps. Since the control loop cannot
respond this fast, the output capacitors must supply the
load current until the control loop can respond.
Normally, several capacitors in parallel are required to
meet microprocessor transient requirements. Capacitor
ESR and ESL primarily determine the amount of droop or
overshoot in the output voltage.
APPLICATIONS INFORMATION
Figure 4. Load Step Transient Forced
Continuous Mode with AVP Mode
Consider the LTC3614 without AVP with a bank of tantalum
output capacitors. If a load step with very fast slew rate
occurs, the voltage excursion will be seen in both direc-
tions, for full load to minimum load transient and for the
minimum load to full load transient.
If the ITH pin is tied to SVIN, the active voltage positioning
(AVP) mode and internal compensation are selected.
AVP mode intentionally compromises load regulation by
reducing the gain of the feedback circuit, resulting in an
output voltage that slightly varies with load current. When
the load current suddenly increases, the output voltage
starts from a level slightly higher than nominal so the output
voltage can droop more and stay within the specied volt-
age range. When the load current suddenly decreases the
output voltage starts at a level lower than nominal so the
output voltage can have more overshoot and stay within
the specied voltage range (see Figures 3 and 4).
The benet is a lower peak-to-peak output voltage deviation
for a given load step without having to increase the output
lter capacitance. Alternatively, the output voltage lter ca-
pacitance can be reduced while maintaining the same peak
to peak transient response. Due to the reduced loop gain
in AVP mode, no external compensation is required.
Figure 3. Load Step Transient Forced
Continuous Mode (AVP Inactive)
VOUT
200mV/DIV
IL
1A/DIV
50μs/DIV
3614 F03
VIN = 3.3V
VOUT = 1.8V
ILOAD = 100mA TO 3A
VMODE = 1.5V
COMPENSATION FIGURE 1
VOUT
100mV/DIV
IL
1A/DIV
50μs/DIV
3614 F04
VIN = 3.3V
VOUT = 1.8V
ILOAD = 100mA TO 3A
VMODE = 1.5V
VITH = 3.3V
OUTPUT CAPACITOR VALUE FIGURE 1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3614IUDD#PBF 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN 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:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT
LTC3614IUDD#TRPBF 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN 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:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT
LTC3614MPUDD#PBF 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN
LTC3614MPUDD#TRPBF 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN
LTC3615EFE#PBF 功能描述:IC REG BUCK SYNC ADJ 3A 24TSSOP 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:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT
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