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| 型号： | LTC3542IS6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16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： | 500mA |
| 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 |
LTC3542
APPLICATIONS INFORMATION
Table 1. Representative Surface Mount Inductors
MAX DC
MANUFACTURER
Sumida
PART NUMBER
CDRH2D11-2RM
CDRH3D16
CMD4D11
CDH2D09B
CLS4D09
VALUE
(μH)
2.2
2.2
2.2
3.3
4.7
CURRENT
(A)
0.780
1.2
0.95
0.85
0.75
DCR
( Ω )
0.098
0.075
0.116
0.15
0.15
SIZE (mm 3 )
3.2 × 3.2 × 1.2
3.8 × 3.8 × 1.8
4.4 × 5.8 × 1.2
2.8 × 3 × 1
4.9 × 4.9 × 1
Murata
LQH32CN
2.2
0.79
0.097 2.5 × 3.2 × 1.55
LQH43CN
4.7
0.75
0.15
4.5 × 3.2 × 2.6
TDK
IVLC453232
VLF3010AT-
2.2
2.2
0.85
1.0
0.18
0.12
4.8 × 3.4 × 3.4
2.8 × 2.6 × 1
2R2M1R0
design. An additional 0.1μF to 1μF ceramic capacitor is
also recommended on V IN for high frequency decoupling,
T495 series, and Sprague 593D and 595D series. Consult
the manufacturer for other speci?c recommendations.
when not using an all ceramic capacitor solution.
Ceramic Input and Output Capacitors
Output Capacitor (C OUT ) Selection
The selection of C OUT is driven by the required ESR to
minimize voltage ripple and load step transients. Typically,
once the ESR requirement is satis?ed, the RMS current
rating generally far exceeds the I RIPPLE(P-P) requirement,
except for an all ceramic solution. The output ripple ( Δ V OUT )
is determined by:
Higher value, lower cost ceramic capacitors are now
becoming available in smaller case sizes. Their high
ripple current rating, high voltage rating and low ESR
are tempting for switching regulator use. However, the
ESR is so low that it can cause loop stability problems.
Since the LTC3542’s control loop does not depend on
the output capacitor’s ESR for stable operation, ceramic
Δ V OUT L ? ESR +
≈ Δ I
?
?
1 ?
8 ? ? O ? C OUT ? ?
capacitors can be used to achieve very low output ripple
and small circuit size. X5R or X7R ceramic capacitors are
recommended because these dielectrics have the best
where f O is the switching frequency, C OUT is the output
capacitance and Δ I L is the inductor ripple current. For a ?xed
output voltage, the output ripple is highest at maximum
input voltage since Δ I L increases with input voltage.
If tantalum capacitors are used, it is critical that the capaci-
tors are surge tested for use in switching power supplies.
An excellent choice is the AVX TPS series of surface mount
tantalums, available in case heights ranging from 2mm to
4mm. These are specially constructed and tested for low
ESR so they give the lowest ESR for a given volume. Other
capacitor types include Sanyo POSCAP, Kemet T510 and
temperature and voltage characteristics of all the ceramics
for a given value and size.
Great care must be taken when using only ceramic input
and output capacitors. When a ceramic capacitor is used
at the input and the power is being supplied through long
wires, such as from a wall adapter, a load step at the output
can induce ringing at the V IN pin. At best, this ringing can
couple to the output and be mistaken as loop instability.
At worst, the ringing at the input can be large enough to
damage the part. For more information, see Application
Note 88. The recommended capacitance value to use is
10μF for both input and output capacitors.
3542fa
9
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| LTC3543EDCB#TRMPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 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:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3543EDCB#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 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:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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