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參數(shù)資料
| 型號： | LTC3406ABES5#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 5 PIN |
| 文件頁數(shù)： | 16/16頁 |
| 文件大小： | 307K |
| 代理商： | LTC3406ABES5#PBF |
LTC3406AB
9
3406abfa
Typically, once the ESR requirement for COUT has been
met, the RMS current rating generally far exceeds the
IRIPPLE(P-P) requirement. The output ripple ΔVOUT is
determined by:
Δ Δ
+
V
I
ESR
fC
OUT
L
OUT
1
8
where f = operating frequency, COUT = output capacitance
and ΔIL = ripple current in the inductor. For a xed output
voltage, the output ripple is highest at maximum input
voltage since ΔIL increases with input voltage.
Aluminum electrolytic and dry tantalum capacitors are both
available in surface mount congurations. In the case of
tantalum, it is critical that the capacitors are surge tested
for use in switching power supplies. An excellent choice is
the AVX TPS series of surface mount tantalum. These are
specially constructed and tested for low ESR so they give
the lowest ESR for a given volume. Other capacitor types
include Sanyo POSCAP, Kemet T510 and T495 series, and
Sprague 593D and 595D series. Consult the manufacturer
for other specic recommendations.
Using Ceramic Input and Output Capacitors
Higher values, lower cost ceramic capacitors are now
becoming available in smaller case sizes. Their high ripple
current, high voltage rating and low ESR make them
ideal for switching regulator applications. Because the
LTC3406AB’s control loop does not depend on the output
capacitor’s ESR for stable operation, ceramic capacitors
can be used freely to achieve very low output ripple and
small circuit size.
However, care must be taken when ceramic capacitors
are used at the input and the output. When a ceramic
capacitor is used at the input and the power is supplied
by a wall adapter through long wires, a load step at the
output can induce ringing at the input, VIN. At best, this
ringing can couple to the output and be mistaken as loop
instability. At worst, a sudden inrush of current through
the long wires can potentially cause a voltage spike at VIN,
large enough to damage the part.
When choosing the input and output ceramic capacitors,
choose the X5R or X7R dielectric formulations. These
dielectrics have the best temperature and voltage charac-
teristics of all the ceramics for a given value and size.
Output Voltage Programming
In the adjustable version, the output voltage is set by a
resistive divider according to the following formula:
VV
R
OUT =+
06
1
2
1
.
(2)
The external resistive divider is connected to the output,
allowing remote voltage sensing as shown in Figure 1.
APPLICATIONS INFORMATION
VFB
GND
LTC3406AB
0.6V
≤ VOUT ≤ 5.5V
R2
R1
3406AB F03
Figure 1. Setting the LTC3406AB Output Voltage
Efciency Considerations
The efciency of a switching regulator is equal to the output
power divided by the input power times 100%. It is often
useful to analyze individual losses to determine what is
limiting the efciency and which change would produce
the most improvement. Efciency can be expressed as:
Efciency = 100% – (L1 + L2 + L3 + ...)
where L1, L2, etc. are the individual losses as a percent-
age of input power.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3406ABES5TRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 5.5V TSOT23-5 |
| LTC3406ABES5-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3406AES5#TRMPBF | 功能描述:IC REG BUCK SYNC ADJ TSOT23-5 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(shù):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(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3406AES5#TRPBF | 功能描述:IC REG BUCK SYNC ADJ TSOT23-5 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LTC3406AES5-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
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