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參數(shù)資料
| 型號： | LTC3526BEDC |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.5 A SWITCHING CONTROLLER, 1300 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 731K |
| 代理商： | LTC3526BEDC |
LTC3526/LTC3526B
10
3526fa
APPLICATIO S I FOR ATIO
W
U
VIN > VOUT OPERATION
The LTC3526/LTC3526B will maintain voltage regulation
even when the input voltage is above the desired output
voltage.Notethattheefciencyismuchlowerinthismode,
and the maximum output current capability will be less.
Refer to the Typical Performance Characteristics.
SHORT-CIRCUIT PROTECTION
The LTC3526/LTC3526B output disconnect feature allows
output short circuit while maintaining a maximum inter-
nally set current limit. To reduce power dissipation under
short-circuit conditions, the peak switch current limit is
reduced to 400mA (typical).
SCHOTTKY DIODE
Although it is not required, adding a Schottky diode from
SW to VOUT will improve efciency by about 2%. Note
that this defeats the output disconnect and short-circuit
protection features.
PCB LAYOUT GUIDELINES
The high speed operation of the LTC3526/LTC3526B
demands careful attention to board layout. A careless
layout will result in reduced performance. Figure 1 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 LTC3526/LTC3526B can utilize small surface mount
chip inductors due to their fast 1MHz switching frequency.
Inductor values between 3.3H and 6.8H are suitable for
most applications. Larger values of inductance will allow
slightly greater output current capability (and lower the
BurstModethreshold)byreducingtheinductorripplecur-
rent. Increasing the inductance above 10H will increase
size while providing little improvement in output current
capability.
The minimum inductance value is given by:
L
V
Ripple V
IN MIN
OUT MAX
IN MIN
OUT
>
(
)
(
)
(
)
(
)
(
–
M
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 efciency. 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 1. Recommended Component Placement for Single Layer Board
+
SW
LTC3526
1
GND
MINIMIZE
TRACE ON FB
AND SW
2
VIN
MULTIPLE VIAS
TO GROUND PLANE
VIN
VOUT
FB
SHDN
3526 F01
3
6
5
4
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC3526BEDC#PBF | 制造商:Linear Technology 功能描述:BOOST 0.85VMIN 1.5-5.25V 0.5A 6DFN 制造商:Linear Technology 功能描述:BOOST, 0.85VMIN, 1.5-5.25V, 0.5A, 6DFN 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Cut Tape 500mA Low Vout Synchronous Boost w/disconnect 制造商:Linear Technology 功能描述:IC, DC-DC CONV, DFN-6, Primary Input Voltage:6V, No. of Outputs:1, Output Voltage:5.25V, Output Current:500mA, No. of Pins:6, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
| LTC3526BEDC#PBF | 制造商:Linear Technology 功能描述:IC DC-DC CONV DFN-6 制造商:Linear Technology 功能描述:IC, DC-DC CONV, DFN-6 |
| LTC3526BEDC#TRMPBF | 功能描述:IC REG BOOST SYNC ADJ 0.5A 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 |
| LTC3526BEDC#TRPBF | 功能描述:IC REG BOOST SYNC ADJ 0.5A 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 |
| LTC3526BEDC-2#TRMPBF | 功能描述:IC REG BOOST SYNC ADJ 0.5A 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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