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| 型号： | LT3509EDE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.2 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | 4 X 3 MM, LEAD FREE, PLASTIC, MO-229WGED-3, DFN-14 |
| 文件页数： | 7/24页 |
| 文件大小： | 271K |
| 代理商： | LT3509EDE#TRPBF |
LT3509
15
3509fc
APPLICATIONS INFORMATION
Table 2. Recommended Inductors
MANUFACTURER/
PART NUMBER
VALUE
(μH)
ISAT
(A)
DCR
(Ω)
HEIGHT
(mm)
Coilcraft
LPS4018-222ML
2.2
2.8
0.07
1.7
LPS5030-332ML
3.3
2.5
0.066
2.9
LPS5030-472ML
4.7
2.5
0.083
2.9
LPS6225-682ML
6.8
2.7
0.095
2.4
LPS6225-103ML
10
2.1
0.105
2.4
Sumida
CDRH4D22/HP-2R2N
2.2
3.2
0.0035
2.4
CDRH4D22/HP-3R5N
3.5
2.5
0.052
2.4
CDRH4D22/HP-4R7N
4.7
2.2
0.066
2.4
CDRH5D28/HP-6R8N
6.8
3.1
0.049
3.0
CDRH5D28/HP-8R2N
8.2
2.7
0.071
3.0
CDRH5D28R/HP-100N
10
2.45
0.074
3.0
Cooper
SD52-2R2-R
2.2
2.30
0.0385
2.0
SD52-3R5-R
3.5
1.82
0.0503
2.0
SD52-4R7-R
4.7
1.64
0.0568
2.0
SD6030-5R8-R
5.8
1.8
0.045
3.0
SD7030-8R0-R
8.0
1.85
0.058
3.0
SD7030-100-R
10.0
1.7
0.065
3.0
Toko
A997AS-2R2N
2.2
1.6
0.06
1.8
A997AS-3R3N
3.3
1.2
0.07
1.8
A997AS-4R7M
4.7
1.07
0.1
1.8
Würth
7447745022
2.2
3.5
0.036
2.0
7447745033
3.3
3.0
0.045
2.0
7447745047
4.7
2.4
0.057
2.0
7447745076
7.6
1.8
0.095
2.0
7447445100
10
1.6
0.12
2.0
The prior analysis is valid for continuous mode operation
(IOUT > ΔILIM / 2). For details of maximum output current
in discontinuous mode operation, see Linear Technology’s
Application Note 44. Finally, for duty cycles greater than
50% (VOUT/VIN > 0.5), a minimum inductance is required
to avoid subharmonic oscillations. This minimum induc-
tance is
LV
V
f
MIN
OUT
F
SW
=+
()
.
14
where fSW is in MHz and LMIN is in μH.
If using external synchronization, calculate LMIN using the
RT frequency and not the SYNC frequency.
Frequency Compensation
The LT3509 uses current mode control to regulate the
output, which simplies loop compensation and allows
the necessary lter components to be integrated. The xed
internal compensation network has been chosen to give
stable operation over a wide range of operating conditions
but assumes a minimum load capacitance. The LT3509
does not depend on the ESR of the output capacitor for
stability so the designer is free to use ceramic capacitors
to achieve low output ripple and small PCB footprint.
Figure 10 shows an equivalent circuit for the LT3509 control
loop. The error amp is a transconductance amplier with
nite output impedance. The power section, consisting of
the modulator, power switch and inductor is modeled as a
transconductance amplier generating an output current
proportional to the voltage at the COMP-NODE. The gain
of the power stage (gmp) is 1.1S. Note that the output
capacitor integrates this current and that the internal
capacitor integrates the error amplier output current,
resulting in two poles in the loop. In most cases, a zero is
required and comes either from the output capacitor ESR
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3509EMSE#PBF | 功能描述:IC REG BUCK ADJ 0.7A DL 16MSOP 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 |
| LT3509EMSE#TRPBF | 功能描述:IC REG BUCK ADJ 0.7A DL 16MSOP 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 |
| LT3509EMSEPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Dual Step-Down 3.6-36V MSOP16 |
| LT3509EMSE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 36V, 700mA Step-Down Regulator |
| LT3509EMSE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 36V, 700mA Step-Down Regulator |
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