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| 型号： | LTC3568EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.8A 10DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 最高 4MHz |
| 电流 - 输出： | 1.8A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3568
APPLICATIONS INFORMATION
Table 1. Representative Surface Mount Inductors
MANU- MAX DC
FACTURER PART NUMBER VALUE CURRENT DCR HEIGHT
Toko A914BYW-2R2M (D52LC) 2.2μH 2.05A 49m Ω 2mm
V IN for high frequency decoupling, when not using an all
ceramic capacitor solution.
Output Capacitor (C OUT ) Selection
Toko
Toko
Coilcraft
Sumida
Sumida
A915Y-2R0M (D53LC-A)
A918CY-2R0M (D62LCB)
D01608C-222
CDRH2D18/HP1R7
CDRH4D282R2
2μH
2μH
2.2μH
1.7μH
2.2μH
3.3A
2.33A
2.3A
1.8A
2.04A
22m Ω
24m Ω
70m Ω
35m Ω
23m Ω
3mm
2mm
3mm
2mm
3mm
The selection of C OUT is driven by the required ESR to
minimize voltage ripple and load step transients. Typically,
once the ESR requirement is satisfied, the capacitance
is adequate for filtering. The output ripple ( Δ V OUT ) is
determined by:
Δ V OUT ≈ Δ I L ? ESR +
Sumida CDC5D232R2
TDK VLCF4020T-1R8N1R9
Taiyo Yuden N06DB2R2M
2.2μH
1.8μH
2.2μH
2.16A
1.97A
3.2A
30m Ω 2.5mm
46m Ω 2mm
29m Ω 3.2mm
?
?
1 ?
8 f O C OUT ? ?
Taiyo Yuden N05DB2R2M 2.2μH
Cooper SD14-2R0 2μH
Catch Diode Selection
A catch diode is not necessary.
2.9A
2.37A
32m Ω 2.8mm
45m Ω 1.45mm
where f = operating frequency, C OUT = output capacitance
and Δ I L = ripple current in the inductor. The output ripple
is highest at maximum input voltage since Δ I L increases
with input voltage. With Δ I L = 0.4 ? I OUT the output ripple
will be less than 100mV at maximum V IN and f O = 1MHz
with:
V OUT ( V IN ? V OUT )
I RMS ≈ I MAX
Input Capacitor (C IN ) Selection
In continuous mode, the input current of the converter is a
square wave with a duty cycle of approximately V OUT /V IN .
To prevent large voltage transients, a low equivalent series
resistance (ESR) input capacitor sized for the maximum
RMS current must be used. The maximum RMS capacitor
current is given by:
V IN
where the maximum average output current I MAX equals
the peak current minus half the peak-to-peak ripple cur-
rent, I MAX = I LIM – Δ I L /2.
This formula has a maximum at V IN = 2V OUT , where
I RMS = I OUT /2. This simple worst case is commonly used
to design because even significant deviations do not offer
much relief. Note that capacitor manufacturer’s ripple cur-
rent ratings are often based on only 2000 hours lifetime.
This makes it advisable to further derate the capacitor,
or choose a capacitor rated at a higher temperature than
required. Several capacitors may also be paralleled to meet
the size or height requirements of the design. An additional
0.1μF to 1μF ceramic capacitor is also recommended on
ESRC OUT < 130m Ω
Once the ESR requirements for C OUT have been met, the
RMS current rating generally far exceeds the I RIPPLE(P-P)
requirement, except for an all ceramic solution.
In surface mount applications, multiple capacitors may
have to be paralleled to meet the capacitance, ESR or RMS
current handling requirement of the application. Aluminum
electrolytic, special polymer, ceramic and dry tantulum
capacitors are all available in surface mount packages.
The OS-CON semiconductor dielectric capacitor avail-
able from Sanyo has the lowest ESR(size) product of any
aluminum electrolytic at a somewhat higher price. Special
polymer capacitors, such as Sanyo POSCAP, offer very
low ESR, but have a lower capacitance density than other
types. Tantalum capacitors have the highest capacitance
density, but it has a larger ESR and 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 tantalums, avalable in case heights ranging
from 2mm to 4mm. Aluminum electrolytic capacitors have
a significantly larger ESR, and is often used in extremely
cost-sensitive applications provided that consideration
is given to ripple current ratings and long term reliability.
3568fa
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