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参数资料
| 型号： | LTC3569EFE#PBF |
| 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： | 10/26页 |
| 文件大小： | 468K |
| 代理商： | LTC3569EFE#PBF |
LTC3569
18
3569fd
Selecting The Inductors
Calculating the inductor values for 30% ripple current at
maximum SVIN:
L1 = 2.5V/(2.25MHz240mA)(1–2.5V/4.2V)= 1.9H
L2 = 1.8V/(2.25MHz120mA)(1–1.8V/4.2V)= 3.8H
L3 = 1.2V/(2.25MHz120mA)(1–1.2V/4.2V)= 3.1H
Choosing a vendor’s closest values gives L1 = 2.2H, L2
= L3 = 3.3H. These values result in the maximum ripple
currents of:
IL1 = 2.5V/(2.25MHz2.2H)(1–2.5V/4.2V) = 204mA
IL2 = 1.8V/(2.25MHz3.3H)(1–1.8V/4.2V) = 139mA
IL3 = 1.2V/(2.25MHz3.3H)(1–1.2V/4.2V) = 115mA
Selecting The Output Capacitors
The value of the output capacitors are calculated based
on a 5% load droop for maximum load current step. The
output droop is usually about 2.5 times the linear drop
of the first cycle and is estimated based on the following
formula:
COUT = 2.5IOUT(MAX)/(fCLKVDROOP)
The output capacitor values are calculated as:
COUT1 = 2.5800mA/(2.25MHz125mV) = 7.1F
COUT2 = 2.5400mA/(2.25MHz90mV) = 4.9F
COUT3 = 2.5400mA/(2.25MHz60mV) = 7.4F
Choosing the closest standard values gives, COUT1 = 10F,
COUT2 = 4.7F and COUT3 = 10F.
A 22F input capacitor is selected since the Li-Ion battery
has sufficiently low output impedance.
Setting The Output Voltages
Without toggling the EN pins the LTC3569 develops a 0.8V
reference voltage for each of the feedback pins. The output
voltages are set by a resistive divider as follows:
VOUT = 0.8(1 + R1/R2)
The resistors in Figure 5 are selected as the nearest 1%
standard resistor values. To improve frequency response
feedforward capacitors of 10pF and 20pF are used.
APPLICATIONS INFORMATION
Figure 5. Triple Buck DC/DC Regulators: 800mA, 400mA, 400mA
Design Example 1: Burst Mode Operation
3569 F05a
SVIN PVIN SW1
PGND
SGND
SW2
SW3
PGOOD
FB1
EN1
EN2
EN3
RT
MODE
FB2
FB3
22F
VIN 2.9V TO 4.2V
L1
2.2H*
COUT1
10F
10pF
20pF
COUT2
4.7F
L2
3.3H**
243k
115k
187k
150k
OUT1
2.5V AT 800mA
OUT2
1.8V AT 400mA
20pF
COUT3
10F
L3
3.3H**
187k
374k
OUT3
1.2V AT 400mA
LTC3569
470k
* WURTH 7447745022
** WURTH 7447745033
ILOAD (mA)
EFFICIENCY
(%)
3569 F05b
100
90
80
70
60
50
0.1
1
1000
10000
100
10
BUCK1 = 2.5V
BUCK2 = 1.8V
BUCK3 = 1.2V
VIN = 2.9V TO 4.2V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3569EFE-TRPBF | 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 |
| 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 |
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