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參數(shù)資料
| 型號： | LTC3569IUD#PBF |
| 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, PQCC20 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大小： | 468K |
| 代理商： | LTC3569IUD#PBF |
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LTC3569
19
3569fd
APPLICATIONS INFORMATION
Design Example 2: Dual Bucks, 1.8V at 1.8A and 1.5V
at 600mA
For this example, the LTC3569 is configured to deliver two
fixed voltages of 1.8V and 1.5V from a generic supply over
the full operating range, 2.5V to 5.5V. The load require-
ments range from <1mA in standby mode up to 1.8A for
the 1.8V supply and 600mA for the 1.5V supply.
The fixed internal clock frequency of 2.25MHz meets the
minimum on-time requirements. Burst Mode operation
is selected for high efficiency at the low standby current
level. Calculating the inductor values for 30% ripple cur-
rent at max SVIN:
L1 = 1.8V/(2.25MHz540mA)(1–1.8V/5.5V) = 1.0H
L2 = 1.5V/(2.25MHz180mA)(1–1.5V/5.5V) = 2.2H
Calculating the value of the output capacitors:
COUT1 = 2.51800mA/(2.25MHz90mV) = 22F
COUT2 = 2.5600mA/(2.25MHz75mV) = 8.9F
An input capacitor of 22F is selected to support the
maximum ripple current of 1.2A. An additional 0.1F low
ESR capacitor is placed between SVIN and SGND.
The resistor values shown in Figure 6 are selected as the
closest standard 1% resistors to obtain the correct output
voltages with the full-scale reference voltages of 0.8V. And
20pFfeedforward capacitorsareplaced acrossthe leading
feedback resistors.
Figure 6. Dual Buck DC/DC Regulators: 1.8V at 1800mA, and 1.5V at 600mA
3569 F06a
PVIN SW1
PGND
SGND
SW2
SW3
PGOOD
MODE
SVIN
FB1
EN1
EN2
EN3
RT
FB2
FB3
22F
0.1F
VIN 2.5V TO 5.5V
1H
22F
20pF
2.2H
187k
150k
174k
200k
10F
OUT1
1.8V AT 1.8A
OUT3
1.5V AT 600mA
LTC3569
511k
VIN
Design Example 2: 1.8A Load Step on Buck1
with Buck2 Slave, Burst Mode Operation
CH1
SW1/2
2V/DIV
200mV/DIV
1A/DIV
CH2
ILOAD
1.8A
CH3
VOUT1
336mVP-P
CH4
IL1
1.94A
10s/DIV
3569 F06b
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3569IUD-TRPBF | 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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| LTC3576EUFE#PBF | 功能描述:IC POWER MANAGER W/USB OTG 38QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC3576EUFE#TRPBF | 功能描述:IC POWER MANAGER W/USB OTG 38QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
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