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參數(shù)資料
| 型號(hào)： | LTC3569EFE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 14/26頁 |
| 文件大?。?/td> | 468K |
| 代理商： | LTC3569EFE#TRPBF |
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LTC3569
21
3569fd
APPLICATIONS INFORMATION
Figure 8. Dual Programmable Buck DC/DC Regulators
Design Example 4: Dual 1A Bucks
VOUT = 1.6V, Burst Mode Operation
ILOAD (mA)
EFFICIENCY
(%)
3569 F08b
100
90
80
70
60
50
40
0.1
1
1000
10000
100
10
BUCK 1
BUCK 2, 3
VIN = 2.5V
VIN = 5.5V
3569 F08
SVIN PVIN SW1
PGND
SGND
SW2
SW3
PGOOD
FB1
EN1
EN2
EN3
MODE
RT
FB2
FB3
22F
VIN 2.5V TO 5.5V
2.2H
10F
20pF
10F
2.2H
210k
162k
210k
162k
OUT1 800mA
1.2V STANDBY
1.6V ACTIVE
OUT2 800mA
1.2V STANDBY
1.6V ACTIVE
LTC3569
511k
VIN
DIGITAL
CONTROL
Design Example 4: Dual Programmable Bucks
In this example consider two buck regulators operating
from a 2.5V to 5.5V unregulated supply that are required
togeneratetwoindependentlyprogrammablesuppliesthat
must step from 1.2V in standby up to 1.6V when active,
withamaximumloadcurrentof0.8Awhenactiveand1mA
in standby. Furthermore, when switching between active
and standby, the load voltage should not droop.
Buck 1 is selected for the first regulator, and buck 3 is
configured as a slave power stage in parallel with buck 2
by pulling FB3 up to VIN to obtain the required current level
for the second regulator. Burst Mode operation is selected
to achieve high efficiency during standby operation. The
internal2.25MHzclockfrequencyisselected,asitsatisfies
the minimum on-time requirement. Next, two reference
voltages are selected to match the ratio of the active to
standby voltages: 1.6V/1.2V = 1.3333. There are three
reference value ratios that match this ratio: 0.8V and 0.6V,
0.7V and 0.525V, and 0.6V and 0.45V. As the load cannot
tolerate a voltage droop when switching from standby to
active,the0.7Vand0.525Vreferencesareselectedtomatch
the ratio of output voltages. With this ratio, the buck does
not need to be shutdown as it would if the full-scale 0.8V
referencelevelwaschosen.TheresistorsshowninFigure8
are selected to obtain the nearest feedback ratio from
standard 1% resistors. Calculating the inductor values
for 30% ripple current at maximum SVIN:
L = 1.6V/(2.25MHz240mA)(1–1.6V/5.5V) ≈ 2.2H.
The output capacitor values are selected as the nearest
standard value to obtain 5% voltage droop at maximum
load current step.
COUT = 2.5800mA/(2.25MHz90mV) ≈ 10F.
Select an output capacitor with an ESR of less than 50m
to obtain an output voltage ripple of less than 30mV.
Finally select an input capacitor rated for the worst-case
short-circuit ripple current of 2 IPK/√3 ≈ 2.5A, when both
outputs are shorted to GND.
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| LTC3569EUDC#TRPBF | 2.5 A SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PQCC20 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3569EUD#PBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN 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: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(guān):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(yīng)商設(shè)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 |
| LTC3569EUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN 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: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(guān):- 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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC3569EUDC#PBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN 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: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(guān):- 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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC3569EUDC#TRPBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN 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: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(guān):- 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(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC3569EUD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Triple Buck Regulator With 1.2A and Two 600mA Outputs and Individual Programmable References |
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