參數(shù)資料
型號(hào)： LTC3569IFE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 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(yè)數(shù)： 13/26頁(yè)
文件大小： 468K
代理商： LTC3569IFE#PBF
LTC3569
20
3569fd
APPLICATIONS INFORMATION
Figure 7. Dual Programmable Buck DC/DC Regulators: 1200mA, 1200mA
3569 F07a
SVIN PVIN SW1
PGND
SGND
SW2
SW3
PGOOD
FB1
EN1
EN2
EN3
MODE
RT
FB2
FB3
22F
VIN 2.5V TO 5.5V
1.5H
15F
20pF
15F
1.5H
294k
210k
294k
210k
OUT1 1200mA
1.2V STANDBY
1.8V ACTIVE
OUT2 1200mA
1.2V STANDBY
1.8V ACTIVE
LTC3569
511k
VIN
DIGITAL
CONTROL
Design Example 3: Soft-Start to Standby (1.2V)
Design Example 3: 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 1.8V when active,
with a maximum load current of 1.2A when active and
1mA in standby. Additionally, this application anticipates
possible output short circuits, and is required to operate
without damage in such a situation.
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: 1.8V/1.2V = 1.5. The 0.75V and 0.5V
reference levels mach this ratio. The resistors shown in
Figure 7 are selected to obtain the correct feedback ratio
fromstandard1%resistors.Calculatingtheinductorvalues
for 30% ripple current at maximum SVIN:
L = 1.8V/(2.25MHz360mA)(1–1.8V/5.5V)= 1.5H.
The output capacitor values are selected as the nearest
standard value to obtain 5% voltage droop at maximum
load current step.
COUT = 2.51200mA/(2.25MHz90mV) ≈ 15F.
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.
CH1
OUT1
CH3
PGOOD
CH2
OUT2
CH4
EN1 = EN2
200s/DIV
3569 F07b
500mV/DIV
2V/DIV
相關(guān)PDF資料
PDF描述
LTC3569IUD#PBF 2.5 A SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PQCC20
LTC3569IUDC#PBF 2.5 A SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PQCC20
LTC3569EFE#TRPBF 2.5 A SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PDSO16
LTC3569EUDC#TRPBF 2.5 A SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PQCC20
LTC3588EDD-2#TRPBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3569IFE-TRPBF 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Triple Buck Regulator With 1.2A and Two 600mA Outputs and Individual Programmable References
LTC3569IUD#PBF 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN 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
LTC3569IUD#TRPBF 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN 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
LTC3569IUDC#PBF 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN 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
LTC3569IUDC#TRPBF 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN 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
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