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| 型号： | LTC3560IS6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ TSOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 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 |
| 电流 - 输出： | 800mA |
| 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： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LTC3560
OPERATION
(Refer to Functional Diagram)
Slope Compensation and Inductor Peak Current
Slope compensation provides stability in constant
frequency architectures by preventing subharmonic
oscillations at high duty cycles. It is accomplished internally
by adding a compensating ramp to the inductor current
APPLICATIONS INFORMATION
The basic LTC3560 application circuit is shown in Figure 1.
External component selection is driven by the load re-
quirement and begins with the selection of L followed by
C IN and C OUT .
Inductor Selection
For most applications, the value of the inductor will fall
in the range of 1μH to 3.3μH. Its value is chosen based
on the desired ripple current. Large value inductors
lower ripple current and small value inductors result in
higher ripple currents. Higher V IN or V OUT also increases
the ripple current as shown in equation 1. A reasonable
starting point for setting ripple current is ΔI L = 320mA
(40% of 800mA).
signal at duty cycles in excess of 40%. Normally, this
results in a reduction of maximum inductor peak current
for duty cycles > 40%. However, the LTC3560 uses a
patented scheme that counteracts this compensating
ramp, which allows the maximum inductor peak current
to remain unaffected throughout all duty cycles.
current to prevent core saturation. Thus, a 960mA rated
inductor should be enough for most applications (800mA +
160mA). For better ef?ciency, choose a low DC-resistance
inductor.
The inductor value also has an effect on Burst Mode
operation. The transition to low current operation begins
when the inductor current peaks fall to approximately
200mA. Lower inductor values (higher ΔI L ) will cause this
to occur at lower load currents, which can cause a dip in
ef?ciency in the upper range of low current operation. In
Burst Mode operation, lower inductance values will cause
the burst frequency to increase.
Inductor Core Selection
I L =
1
( f ) ( L )
V OUT 1
V OUT
V IN
(1)
Different core materials and shapes will change the size/
current and price/current relationship of an inductor. Toroid
or shielded pot cores in ferrite or permalloy materials are
The DC current rating of the inductor should be at least
small and don’t radiate much energy, but generally cost
equal to the maximum load current plus half the ripple
Table 1. Representative Surface Mount Inductors
MAX DC
MANUFACTURER
Toko
Sumida
TDK
Coilcraft
Cooper
EPCO
PART NUMBER
A960AW-1R2M-518LC
A960AW-2R3M-518LC
A997AS-3R3M-DB318L
CDRH2D11/HP-1R5
CDRH3D11/HP-1R5
CDRH2D18/HP-2R2
CDRH2D14-3R3
VLF3010AT-1R5M1R2
VLF3010AT-2R2M1R0
D01608C-222
LP01704-222M
SD3112-2R2
B82470A1222M
VALUE
1.2μH
2.3μH
3.3μH
1.5μH
1.5μH
2.2μH
3.3μH
1.5μH
2.2μH
2.2μH
2.2μH
2.2μH
2.2μH
CURRENT
1.8A
1.5A
1.2A
1.35A
2A
1.6A
1.2A
1.2A
1.0A
2.3A
2.4A
1.1A
1.6A
DCR
46mΩ
63mΩ
70mΩ
64mΩ
80mΩ
48mΩ
100mΩ
68mΩ
100mΩ
70mΩ
120mΩ
140mΩ
90mΩ
HEIGHT
1.8mm
1.8mm
1.8mm
1.2mm
1.2mm
2.0mm
1.55mm
1.0mm
1.0mm
3.0mm
1.0mm
1.2mm
1.2mm
3560fb
8
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| LTC3561AEDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 1A 8DFN 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 |
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