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参数资料
| 型号： | LTC3546EFE |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | 4.40 MM, PLASTIC, TSSOP-28 |
| 文件页数： | 7/28页 |
| 文件大小： | 356K |
| 代理商： | LTC3546EFE |
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LTC3546
15
3546fb
Burst Mode Operation Considerations
Therearetwofactorsthatdeterminetheloadcurrentatwhich
theLTC3546entersBurstModeoperation:theinductorvalue
and the BMC pin voltage. The transition from 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 Burst Mode operation to
occur at lower load currents. Lower inductor values will also
cause a dip in efciency in the upper range of low current
operation. Lower inductor values will also cause the burst
frequency to increase in Burst Mode operation.
The burst clamp level can be set by the voltage on the BMC
pin. If BMC is tied to VIN, an internally set level is used. A
BMC pin voltage between 0V and 0.6V will set the burst
clamp level (see charts OUT1 Minimum Peak Current vs
VBMC1 and OUT2 Minimum Peak Current vs VBMC2 in the
Typical Performance Characteristics section). Generally, a
higher clamp level results in improved light load efciency
and higher output voltage ripple, while a lower clamp level
results in small output voltage ripple at the expense of
efciency. The BMC pin should be connected to ground
when Burst Mode operation is not selected.
Inductor Core Selection
Different core materials and shapes will change the size/cur-
rent relationship of an inductor. Toroid or shielded pot cores
in ferrite or permalloy materials are small and don’t radiate
much energy, but generally cost more than powdered iron
core inductors with similar electrical characteristics. The
choice of which style inductor to use often depends more
on the price vs size requirements of any radiated eld/EMI
requirements than on what the LTC3546 requires to oper-
ate. Table 1 shows some typical surface mount inductors
that work well in LTC3546 applications.
Input Capacitor (CIN) Selection
In continuous mode, the input current of the converter can
be approximated by the sum of two square waves with
duty cycles of approximately VOUT1/VIN and VOUT2/VIN. To
prevent large voltage transients, a low equivalent series
resistance (ESR) input capacitor sized for the maximum
RMS current must be used. Some capacitors have a de-
rating spec for maximum RMS current. If the capacitor
being used has this requirement it is necessary to calculate
APPLICATIONS INFORMATION
Table 1.
MANUFACTURER
PART NUMBER
VALUE (μH)
MAX DC CURRENT (A)
DCR
DIMENSIONS L × W × H (mm)
Würth Elektronik
WE-PD2 MS
7447745012
1.2
4.6
0.017
5.2 × 5.8 × 2
Würth Elektronik
WE-PD2 MS
74477450056
0.56
6.5
0.0078
5.2 × 5.8 × 2
Vishay
IHLP-1616AB-11
1.2
3.75
0.068
4.06 × 4.45 × 1.20
Vishay
IHLP-1616AB-11
0.47
6
0.019
4.06 × 4.45 × 1.20
Coilcraft
LPS6225-122
1.2
5.4
0.04
6.2 × 6.2 × 2.5
Coilcraft
DO1813H-561
0.56
7.7
0.01
6.10 × 8.89 × 5.00
Coiltronics
SD20-1R2
1.2
2.55
0.0275
5.2 × 5.2 × 2
Coiltronics
SD20-R47
0.47
4
0.02
5.2 × 5.2 × 2
Sumida
CDRH3D23NP-1R5NC
1
2.8
0.025
3.8 × 3.8 × 2.3
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相关代理商/技术参数 |
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| LTC3546EFE#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 28TSSOP 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 |
| LTC3546EFE#PBF | 制造商:Linear Technology 功能描述:IC DUAL SYNC STEP-DOWN DC/DC REG 28-TSSO |
| LTC3546EFE#TRPBF | 功能描述:IC REG BUCK SYNC ADJ DL 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3546EFEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator |
| LTC3546EFETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator |
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