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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 247K |
| 代理商： | LTC3411IMS |
LTC3411
14
3411fb
overshoot seen at this pin. The bandwidth can also be
estimated by examining the rise time at the pin.
The ITH external components shown in the Figure 1 circuit
will provide an adequate starting point for most applica-
tions. The series R-C lter sets the dominant pole-zero
loop compensation. The values can be modied slightly
(from 0.5 to 2 times their suggested values) to optimize
transient response once the nal PC layout is done and
the particular output capacitor type and value have been
determined. The output capacitors need to be selected
because the various types and values determine the loop
feedback factor gain and phase. An output current pulse of
20% to 100% of full load current having a rise time of 1μs
to 10μs will produce output voltage and ITH pin waveforms
that will give a sense of the overall loop stability without
breaking the feedback loop.
Switching regulators take several cycles to respond to a
step in load current. When a load step occurs, VOUT im-
mediately shifts by an amount equal to
ΔILOADESR,where
ESR is the effective series resistance of COUT. ΔILOAD also
begins to charge or discharge COUT generating a feedback
error signal used by the regulator to return VOUT to its
steady-state value. During this recovery time, VOUT can
be monitored for overshoot or ringing that would indicate
a stability problem.
The initial output voltage step may not be within the
bandwidth of the feedback loop, so the standard second
order overshoot/DC ratio cannot be used to determine
phase margin. The gain of the loop increases with R and
the bandwidth of the loop increases with decreasing C.
If R is increased by the same factor that C is decreased,
the zero frequency will be kept the same, thereby keeping
the phase the same in the most critical frequency range
of the feedback loop. In addition, a feedforward capacitor
CF can be added to improve the high frequency response,
as shown in Figure 5. Capacitor CF provides phase lead by
creating a high frequency zero with R2 which improves
the phase margin.
The output voltage settling behavior is related to the stability
of the closed-loop system and will demonstrate the actual
overall supply performance. For a detailed explanation of
optimizing the compensation components, including a
review of control loop theory, refer to Linear Technology
Application Note 76.
Although a buck regulator is capable of providing the full
output current in dropout, it should be noted that as the
input voltage VINdropstowardVOUT,theloadstepcapability
does decrease due to the decreasing voltage across the
inductor. Applications that require large load step capabil-
ity near dropout should use a different topology such as
SEPIC, Zeta or single inductor, positive buck/boost.
APPLICATIONS INFORMATION
PVIN
LTC3411
PGOOD
SW
SVIN
SYNC/MODE
VFB
ITH
SHDN/RT
L1
D1
OPTIONAL
VIN
2.5V
TO 5.5V
SGND PGND
R5
CF
RT
RC
R1
R2
3411 F05
CC
CITH
C5
VOUT
CIN
+
C6
PGND
SGND
PGND
SGND
SGND SGND
GND
PGND
COUT
R6
C8
SGND
Figure 5. LTC3411 General Schematic
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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 開關(guān)穩(wěn)壓器 系列:- 設(shè)計資源: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 開關(guān)穩(wěn)壓器 系列:- 設(shè)計資源: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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