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參數(shù)資料
| 型號： | LTC3529EDCB#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封裝： | 2 X 3 MM, 0.75 MM PITCH, LEAD FREE, PLASTIC, DFN-8 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大小： | 206K |
| 代理商： | LTC3529EDCB#PBF |
LTC3529
9
3529fb
APPLICATIONS INFORMATION
Inductor Selection
The LTC3529 can utilize small surface-mount chip induc-
tors due to its fast 1.5MHz switching frequency. Larger
values of inductance will allow slightly greater output
current capability by reducing the inductor ripple current.
Increasing the inductance above 10μH will increase com-
ponent size while providing little improvement in output
current capability.
USB On-The-Go specications limit output capacitance to
6.5μF. When using a 6.5μF output capacitance, a 4.7μH
inductor must be used to maintain stability. Larger induc-
tors may be used with larger output capacitors.
The minimum inductance value for a given allowable induc-
tor ripple
ΔI (in Amps peak-to-peak) is given by:
L
VV
V
If V
H
IN MIN
OUT
IN MIN
OUT
>
()
–
Δ
where VIN(MIN) is the minimum input voltage, f is the
operating frequency in MHz (1.5MHz Typ), and VOUT is
the output voltage (5V).
The inductor current ripple is typically set for 20% to 40%
of the maximum inductor current (IP). High frequency
ferrite core inductor materials reduce frequency depen-
dent power losses compared to cheaper powdered iron
cores, improving efciency. To achieve high efciency, a
low ESR inductor should be utilized. The inductor must
have a saturation current rating greater than the worst
case average inductor current plus half the ripple current.
Molded chokes and some chip inductors usually do not have
enough core to support peak LTC3529 inductor currents.
To minimize radiated noise, use a shielded inductor. See
Table 2 for suggested components and suppliers.
Table 2. Representative Surface Mount Inductors
MANUFACTURER PART NUMBER VALUE
(μH)
MAX
CURRENT
(A)
DCR
(
Ω)
HEIGHT
(mm)
Sumida
CDRH5D16NP
4.7
2.15
0.064
1.8
TDK
VLF5014S
4.7
2
0.098
1.4
Coilcraft
MSS6122
4.7
1.82
0.065
2.2
Cooper Bussmann SD25-4R7
4.7
2.3
0.043
2.5
PCB Layout Guidelines
The LTC3529 switches large currents at high frequencies.
Special care should be given to the PCB layout to ensure
stable, noise-free operation. Figure 1 depicts the recom-
mended PCB layout to be utilized for the LTC3529. A few
key guidelines follow:
1. All circulating current paths should be kept as short
as possible. This can be accomplished by keeping the
copper traces to all components in Figure 1 short and
wide. Capacitor ground connections should via down
to the ground plane in the shortest route possible. The
bypass capacitors on VIN and VOUT should be placed
close to the IC and should have the shortest possible
paths to ground.
2. The PGND pin should be shorted directly to the ex-
posed pad, as shown in Figure 1. This provides a single
point connection between the small signal ground and
the power ground, as well as a wide trace for power
ground.
3. All the external components shown in Figure 1 and their
connections should be placed over a complete ground
plane.
4. Use of multiple vias in the die attach pad will enhance
the thermal environment of the converter, especially if
the vias extend to a ground plane region on the exposed
bottom surface or inner layers of the PCB.
Figure 1. LTC3529 Recommended PCB Layout
3
4
2
1
6
5
7
8
MULTIPLE VIAs
TO GROUND PLANE
VIN
RST
SNSGND
FAULT
VOUT
SW
SHDN
PGND
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3530 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Wide Input Voltage Synchronous Buck-Boost DC/DC Converter |
| LTC3530EDD | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 1.8V to 5.5V 10-Pin DFN EP |
| LTC3530EDD#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 10DFN 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 |
| LTC3530EDD#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 10DFN 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(shù):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 |
| LTC3530EDD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Wide Input Voltage Synchronous Buck-Boost DC/DC Converter |
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