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參數(shù)資料
| 型號(hào)： | LTC3411IMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁(yè)數(shù)： | 5/24頁(yè) |
| 文件大小： | 247K |
| 代理商： | LTC3411IMS |
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LTC3411
13
3411fb
Shutdown and Soft-Start
The SHDN/RT pin is a dual purpose pin that sets the oscil-
lator frequency and provides a means to shut down the
LTC3411. This pin can be interfaced with control logic in
several ways, as shown in Figure 3(a) and Figure 3(b).
The ITH pin is primarily for loop compensation, but it can
also be used to increase the soft-start time. Soft start
reduces surge currents from VIN by gradually increasing
the peak inductor current. Power supply sequencing can
also be accomplished using this pin. The LTC3411 has an
internal digital soft-start which steps up a clamp on ITH
over 1024 clock cycles, as can be seen in Figure 4.
The soft-start time can be increased by ramping the volt-
age on ITH during start-up as shown in Figure 3(c). As
the voltage on ITH ramps through its operating range the
internal peak current limit is also ramped at a proportional
linear rate.
Mode Selection and Frequency Synchronization
The SYNC/MODE pin is a multipurpose pin which provides
mode selection and frequency synchronization. Connect-
ing this pin to VIN enables Burst Mode operation, which
provides the best low current efciency at the cost of a
higher output voltage ripple. When this pin is connected to
ground, pulse skipping operation is selected which provides
the lowest output voltage and current ripple at the cost
of low current efciency. Applying a voltage between 1V
and SVIN – 1, results in forced continuous mode, which
creates a xed output ripple and is capable of sinking
some current (about 1/2
ΔIL). Since the switching noise is
constant in this mode, it is also the easiest to lter out. In
many cases, the output voltage can be simply connected to
the SYNC/MODE pin, giving the forced continuous mode,
except at startup.
The LTC3411 can also be synchronized to an external clock
signal by the SYNC/MODE pin. The internal oscillator fre-
quency should be set to 20% lower than the external clock
frequency to ensure adequate slope compensation, since
slope compensation is derived from the internal oscillator.
During synchronization, the mode is set to pulse skipping
and the top switch turn on is synchronized to the rising
edge of the external clock.
Checking Transient Response
The OPTI-LOOP compensation allows the transient re-
sponse to be optimized for a wide range of loads and
output capacitors. The availability of the ITH pin not only
allows optimization of the control loop behavior but also
provides a DC coupled and AC ltered closed loop response
test point. The DC step, rise time and settling at this test
point truly reects the closed loop response. Assuming a
predominantly second order system, phase margin and/or
damping factor can be estimated using the percentage of
APPLICATIONS INFORMATION
3411 F03a
RUN
RT
SHDN/RT
3411 F03b
RUN
RT
SHDN/RT
1M
SVIN
3411 F03c
RUN OR VIN
ITH
C1
CC
D1
RC
R1
(3b)
(3a)
(3c)
Figure 3. SHDN/RT Pin Interfacing and External Soft-Start
200μs/DIV
VOUT
2V/DIV
VIN
2V/DIV
IL1
500mA/DIV
3411 F04
VIN = 3.3V
VOUT = 2.5V
RL = 1.4Ω
Figure 4. Digital Soft-Start
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參數(shù)描述 |
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| LTC3411IMS#PBF | 功能描述:IC REG BUCK SYNC ADJ 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)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 |
| LTC3411IMS#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)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 |
| LTC3412 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:8A, 4MHz, Monolithic Synchronous Step-Down Regulator |
| LTC3412A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:3A, 4MHz, Monolithic Synchronous Step-Down Regulator |
| LTC3412AEFE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.25V to 5.5V 16-Pin TSSOP EP |
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