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參數資料
| 型號： | LT3694IUFD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.6 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件頁數： | 5/28頁 |
| 文件大?。?/td> | 276K |
| 代理商： | LT3694IUFD#PBF |
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LT3694/LT3694-1
13
36941fa
quality (under damped) tank circuit. If the LT3694 circuit
is plugged into a live supply, the input voltage can ring to
twice its nominal value, possibly exceeding the LT3694’s
maximum input voltage rating. See Linear Technology
Application Note 88 for more details.
Output Capacitor Selection
The output capacitor filters the inductor current to generate
an output with low voltage ripple. It also stores energy in
order to satisfy transient loads and stabilize the LT3694’s
control loop. Because the LT3694 operates at a high
frequency, minimal output capacitance is necessary. In
addition, the control loop operates well with or without
the presence of output capacitor series resistance (ESR).
Ceramic capacitors, which achieve very low output ripple
and small circuit size, are therefore an option.
Output ripple can be estimated with the following
equations:
V
RIPPLE =
ΔI
L
8 f C
OUT
; Ceramic
V
RIPPLE =ΔIL ESR
; Electrolytic
where ΔIL is the peak-to-peak ripple current in the inductor.
The RMS content of this ripple is very low so the RMS
current rating of the output capacitor is usually not of
concern. It can be estimated with the formula:
I
C(RMS) =
ΔI
L
12
Another constraint on the output capacitor is that it must
have greater energy storage than the inductor; if the stored
energy in the inductor transfers to the output, the resulting
voltage step should be small compared to the regulation
voltage. For a 5% overshoot, this requirement indicates:
C
OUT > 10 L
I
LIM
V
OUT
2
The low ESR and small size of ceramic capacitors make
them the preferred type for LT3694 applications. Not all
ceramic capacitors are the same, however. Many of the
higher value capacitors use poor dielectrics with high
temperature and voltage coefficients. In particular, Y5V
and Z5U types lose a large fraction of their capacitance
with applied voltage and at temperature extremes. Because
loop stability and transient response depend on the value
of COUT, this loss may be unacceptable. Use X7R and X5R
types instead.
Electrolytic capacitors are also an option. The ESRs of
most aluminum electrolytic capacitors are too large to
deliver low output ripple. Surge rated tantalum capacitors
or low ESR, organic, electrolytic capacitors intended for
power supply use are suitable. Choose a capacitor with a
sufficiently low ESR for the required output ripple. Because
the volume of the capacitor determines its ESR, both the
size and the value will be larger than a ceramic capacitor
that would give similar ripple performance. One benefit
is that the larger capacitance may give better transient
response for large changes in load current. Table 3 lists
several capacitor vendors.
Table 3. Low ESR Surface Mount Capacitors
SERIES
TYPE
MANUFACTURER
Ceramic
Taiyo Yuden
www.t-yuden.com
TPM, TPS
Ceramic, Tantalum
AVX
www.avx.com
T494, T495,
T510, T520,
T525, T530,
A700
Ceramic, Tantalum,
Tantalum Organic Polymer,
Aluminum Organic Polymer
Kemet
www.kemet.com
POSCAP,
OS-CON
Tantalum Organic Polymer,
Aluminum Organic Polymer
Sanyo
www.sanyo.com
SP-CAP
Ceramic,
Aluminum Organic Polymer
Panasonic
www.panasonic.com
Ceramic
TDK
www.tdk.com
APPLICATIONS INFORMATION
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相關代理商/技術參數 |
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|---|---|
| LT3695 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Fault Tolerant Micropower Step-Down Regulator |
| LT3695EMSE#PBF | 功能描述:IC REG BUCK ADJ 1A 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 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:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT3695EMSE#TRPBF | 功能描述:IC REG BUCK ADJ 1A 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LT3695EMSE-3.3#PBF | 功能描述:IC REG BUCK 3.3V 1A 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LT3695EMSE-3.3#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR MSOP-16 |
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