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參數(shù)資料
| 型號(hào)： | LTC3526LBEDC-2#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 332K |
| 代理商： | LTC3526LBEDC-2#TRPBF |
LTC3526L-2/LTC3526LB-2
0
3526lb2fa
VIN > VOUT OPERATION
TheLTC3526L-2/LTC3526LB-2willmaintainvoltageregu-
lation even when the input voltage is above the desired
outputvoltage.Notethattheefficiencyismuchlowerinthis
mode, and the maximum output current capability will be
less. Refer to the Typical Performance Characteristics.
SHORT-CIRCUIT PROTECTION
The LTC3526L-2/LTC3526LB-2 output disconnect feature
allows output short circuit while maintaining a maximum
internally set current limit. To reduce power dissipation
under short-circuit conditions, the peak switch current
limit is reduced to 400mA (typical).
SCHOTTKY DIODE
Althoughnotrecommended,addingaSchottkydiodefrom
SW to VOUT will improve efficiency by about 2%. Note
that this defeats the output disconnect and short-circuit
protection features.
PCB LAYOUT GUIDELINES
ThehighspeedoperationoftheLTC3526L-2/LTC3526LB-2
demands careful attention to board layout. A careless
layout will result in reduced performance. Figure 2 shows
the recommended component placement. A large ground
pin copper area will help to lower the die temperature. A
multilayer board with a separate ground plane is ideal, but
not absolutely necessary.
COMPONENT SELECTION
Inductor Selection
The LTC3526L-2/LTC3526LB-2 can utilize small surface
mount chip inductors due to their fast 2MHz switching
frequency. Inductor values between 1.5H and 4.7H are
suitableformostapplications.Largervaluesofinductance
will allow slightly greater output current capability (and
lower the Burst Mode threshold) by reducing the inductor
ripple current. Increasing the inductance above 6.8H will
increasecomponentsizewhileprovidinglittleimprovement
in output current capability.
The minimum inductance value is given by:
L
V
Ripple V
IN MIN
OUT MAX
IN MIN
OU
>
(
)
(
)
(
)
(
)
–
2
TT MAX
(
)
where:
Ripple = Allowable inductor current ripple (amps peak-
peak)
VIN(MIN) = Minimum input voltage
VOUT(MAX) = Maximum output voltage
The inductor current ripple is typically set for 20% to
40% of the maximum inductor current. High frequency
ferrite core inductor materials reduce frequency depen-
dent power losses compared to cheaper powdered iron
types, improving efficiency. The inductor should have
low ESR (series resistance of the windings) to reduce the
I2R power losses, and must be able to support the peak
Figure 2. Recommended Component Placement for Single Layer Board
+
SW
LTC3526L-2
1
GND
MINIMIZE
TRACE ON FB
AND SW
2
VIN
MULTIPLE VIAS
TO GROUND PLANE
VIN
VOUT
FB
SHDN
3526lb2 F02
3
6
5
4
applicaTions inForMaTion
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3526LBEDC-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:550mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
| LTC3526LBEDC-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:550mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
| LTC3526LEDC#PBF | 制造商:Linear Technology 功能描述:BOOST SYNCH 0.5A 1MHZ 6DFN 制造商:Linear Technology 功能描述:BOOST, SYNCH, 0.5A, 1MHZ, 6DFN |
| LTC3526LEDC#TRMPBF | 功能描述:IC REG BOOST SYNC ADJ 0.55A 6DFN 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:- 標(biāo)準(zhǔn)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(guān):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(yīng)商設(shè)備封裝:8-SOIC |
| LTC3526LEDC#TRPBF | 功能描述:IC REG BOOST SYNC ADJ 0.55A 6DFN 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:- 標(biāo)準(zhǔn)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(guān):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(yīng)商設(shè)備封裝:8-SOIC |
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