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参数资料
| 型号： | LTC3569EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 0.43 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz，1MHz ~ 3MHz |
| 电流 - 输出： | 600mA，1.2A |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
LTC3569
APPLICATIONS INFORMATION
Setting the Output Voltages
The LTC3569 develops independent internal reference
voltages for each of the feedback pins. These reference
voltages are programmed from 0.8V down to 0.425V in
–25mV increments by toggling the appropriate EN pin.
The output voltage is set by a resistive divider according
to the following formula (refer to Figure 9 for resistor
designations):
V OUT1 = V REF1 (1 + R1/R2),
where V REF1 is programmed by toggling the EN1 pin.
V OUT2 = V REF2 (1 + R3/R4),
where V REF2 is programmed by toggling the EN2 pin.
V OUT3 = V REF3 (1 + R5/R6),
where V REF3 is programmed by toggling the EN3 pin.
Keeping the current small (<5μA) in these resistors
maximizes efficiency, but making the current too small
may allow stray capacitance to cause noise problems and
reduce the phase margin of the error amp loop.
To improve the frequency response, use a feedforward
capacitor, C F , on the order of 20pF across the leading
feedback resistor (R1, R3, and R5). Take care to route
each FB line away from noise sources, such as the induc-
tor or the SW line. Remove the ground plane from below
the FB PCB routes to limit stray capacitance to GND on
these pins.
A reasonable starting point for setting ripple current is
? I L = 0.3 ?I OUT(MAX) , where I OUT(MAX) is the maximum
load current. The largest ripple current ? I L occurs at the
maximum input voltage. To guarantee that the ripple current
stays below a specified maximum, choose the inductor
value according to the following equation:
L = V OUT /(f CLK ? ? I L )?(1 – V OUT /V IN(MAX) )
The inductor value also has an effect on Burst Mode
operation. The transition to low current operation begins
when the peak inductor current falls below a level set by
the burst clamp. Lower inductor values result in higher
ripple current which causes this to occur at lower load
currents. This causes a dip in efficiency in the upper
range of low current operation. In Burst Mode operation,
lower inductance values increase the burst frequency and
reduces efficiency.
Choose an inductor with a DC current rating at least 1.5
times larger than the maximum load current to ensure
that the inductor core does not saturate during normal
operation. If an output short-circuit is a possible condition,
select an inductor that is rated to handle the maximum
peak current specified for the regulators. To maximize
efficiency, choose an inductor with a low DC resistance;
as power loss in the inductor is due to I 2 R losses. Where
I 2 is the square of the average output current and R is the
ESR of the inductor.
Table 1. Low Profil e Inductors
Inductor Selection
Although the inductor does not influence the operating
frequency, the inductor value has a direct effect on ripple
current. The inductor ripple current ? I L decreases with
higher inductance and increases with higher V IN or V OUT :
? I L = V OUT /(f CLK ?L )?(1–V OUT /V IN )
Accepting larger values of ? I L allows the use of low
inductances, but results in higher output voltage ripple,
greater core losses, and lower output current capability.
VENDOR/
PART NUMBER
Wurth
7440430022
744031002
MuRata
LQH55PN1R2
LQH55PN2R2
Toko, DEV518C
1124BS-1R8N
1124BS-2R4M
EPCOS
B824691152M000
B824691221M000
VALUE
(μH)
2.2
2.5
1.2
2.2
1.8
2.4
1.5
2.2
IDC
(APPROX.)
2.50
1.45
2.60
2.10
2.70
2.30
1.70
1.55
RDC
(Ω)
0.023
0.050
0.021
0.031
0.047
0.054
0.046
0.065
HEIGHT
(mm)
2.80
1.65
1.85
1.85
1.80
1.80
1.20
1.20
3569fd
15
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| 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 |
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| 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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