參數(shù)資料
型號(hào)： LTC3112EDHD#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 12 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 5 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WJGD-2, DFN-16
文件頁(yè)數(shù)： 8/32頁(yè)
文件大?。?/td> 651K
代理商： LTC3112EDHD#PBF
LTC3112
16
3112f
CAPACITOR VENDOR INFORMATION
Both the input bypass capacitors and output capacitors
used with the LTC3112 must be low ESR and designed
to handle the large AC currents generated by switching
converters. This is important to maintain proper functioning
of the IC and to reduce ripple on both the input and output.
Many modern low voltage ceramic capacitors experience
signicant loss in capacitance from their rated value
with increased DC bias voltages. For example, it is not
uncommon for a small surface mount ceramic capacitor to
lose 50% or more of its rated capacitance when operated
near its rated voltage. As a result, it is sometimes necessary
to use a larger value capacitance or a capacitor with a
higher voltage rating then required in order to actually
realize the intended capacitance at the full operating
voltage. For details, consult the capacitor vendor’s curve
of capacitance versus DC bias voltage.
The capacitors listed in Table 2 provide a sampling of small
surface mount ceramic capacitors that are well suited to
LTC3112 application circuits. All listed capacitors are either
X5R or X7R dielectric in order to ensure that capacitance
loss overtemperature is minimized.
Table 2. Representative Bypass and Output Capacitors
PART NUMBER
VALUE
(μF)
VOLTAGE
(V)
SIZE (mm)
L
× W × H
AVX LD103D226MAB2A
22
25
3.2
× 2.5 × 2.79
Kemet C1210C476M4PAC7025
47
16
3.2
× 2.5 × 2.5
Murata GRM32ER61E226KE15L
22
25
3.6
× 2.5 × 2.5
Taiyo Yuden EMK325BJ476MM-T
47
16
3.2
× 2.5 × 2.5
TDK C5750X5RIC476M
47
16
5.7
× 5 × 2.3
PCB LAYOUT CONSIDERATIONS
The LTC3112 switches large currents at high frequencies.
Special attention should be paid to the PCB layout to ensure
a stable, noise-free and efcient application circuit. Figure 3
presents a representative 4-layer PCB layout to outline
some of the primary considerations. A few key guidelines
are outlined below:
1. A 4-layer board is highly recommended for the LTC3112
to ensure stable performance over the full operating
voltage and current range. A dedicated/solid ground
APPLICATIONS INFORMATION
plane should be placed directly under the VIN, VOUT,
SW1 and SW2 traces to provide a mirror plane to
minimize noise loops from high dI/dt and dV/dt edges
(see Figure 3, 2nd layer).
2. All circulating high current paths should be kept as
short as possible. Capacitor ground connections
should via down to the ground plane in the shortest
route possible. The bypass capacitors on VIN should be
placed as close to the IC as possible and should have
the shortest possible paths to ground (see Figure 3,
top layer).
3. The exposed pad is the power ground connection for
the LTC3112. Multiple vias should connect the backpad
directly to the ground plane. In addition maximization
of the metallization connected to the backpad will
improve the thermal environment and improve the
power handling capabilities of the IC.
4. The high current components and their connections
should all be placed over a complete ground plane to
minimize loop cross-sectional areas. This minimizes
EMI and reduces inductive drops.
5. Connections to all of the high current components
should be made as wide as possible to reduce the
series resistance. This will improve efciency and
maximize the output current capability of the buck-
boost converter.
6. To prevent large circulating currents from disrupting
the output voltage sensing, the ground for each resistor
divider should be returned to the ground plane using
a via placed close to the IC and away from the power
connections.
7. Keep the connection from the resistor dividers to the
feedback pins FB as short as possible and away from
the switch pin connections.
8. Crossover connections should be made on inner copper
layers if available. If it is necessary to place these on
the ground plane, make the trace on the ground plane
as short as possible to minimize the disruption to the
ground plane (see Figure 3, 3rd layer).
相關(guān)PDF資料
PDF描述
LTC3112EDHD#TRPBF 12 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3112EFE#PBF 功能描述:IC REG BUCK BOOST SYNC 20-TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:升壓（升壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱(chēng):AS1323-BTTT-30CT
LTC3112EFE#PBF 制造商:Linear Technology 功能描述:IC DC-DC CONV 1.5MHz TSSOP20
LTC3112EFE#TRPBF 功能描述:IC REG BUCK BST SYNC ADJ 20TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:升壓（升壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱(chēng):AS1323-BTTT-30CT
LTC3112EFEPBF 制造商:Linear Technology 功能描述:15V 2.5A Synch Buck-Boost DC/DC TSSOP20
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