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| 型号： | LTC3569EFE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-16 |
| 文件页数： | 11/26页 |
| 文件大小： | 468K |
| 代理商： | LTC3569EFE#TRPBF |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3569EUD#PBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3569EUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3569EUDC#PBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3569EUDC#TRPBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3569EUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Triple Buck Regulator With 1.2A and Two 600mA Outputs and Individual Programmable References |
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