参数资料
| 型号： | LT3509HMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.7A DL 16MSOP |
| 标准包装： | 37 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 35.3 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 260kHz ~ 2.15MHz |
| 电流 - 输出： | 700mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
LT3509
APPLICATIONS INFORMATION
Table 2. Recommended Inductors
The prior analysis is valid for continuous mode operation
MANUFACTURER/
PART NUMBER
VALUE
(μH)
I SAT
(A)
DCR
( Ω )
HEIGHT
(mm)
(I OUT > Δ I LIM / 2). For details of maximum output current
in discontinuous mode operation, see Linear Technology’s
Coilcraft
Application Note 44. Finally, for duty cycles greater than
LPS4018-222ML
LPS5030-332ML
LPS5030-472ML
2.2
3.3
4.7
2.8
2.5
2.5
0.07
0.066
0.083
1.7
2.9
2.9
50% (V OUT /V IN > 0.5), a minimum inductance is required
to avoid subharmonic oscillations. This minimum induc-
tance is
LPS6225-682ML
LPS6225-103ML
Sumida
6.8
10
2.7
2.1
0.095
0.105
2.4
2.4
L MIN = ( V OUT + V F ) ?
1.4
f SW
CDRH4D22/HP-2R2N
CDRH4D22/HP-3R5N
CDRH4D22/HP-4R7N
CDRH5D28/HP-6R8N
CDRH5D28/HP-8R2N
CDRH5D28R/HP-100N
2.2
3.5
4.7
6.8
8.2
10
3.2
2.5
2.2
3.1
2.7
2.45
0.0035
0.052
0.066
0.049
0.071
0.074
2.4
2.4
2.4
3.0
3.0
3.0
where f SW is in MHz and L MIN is in μH.
If using external synchronization, calculate L MIN using the
R T frequency and not the SYNC frequency.
Frequency Compensation
Cooper
The LT3509 uses current mode control to regulate the
SD52-2R2-R
SD52-3R5-R
SD52-4R7-R
SD6030-5R8-R
SD7030-8R0-R
SD7030-100-R
2.2
3.5
4.7
5.8
8.0
10.0
2.30
1.82
1.64
1.8
1.85
1.7
0.0385
0.0503
0.0568
0.045
0.058
0.065
2.0
2.0
2.0
3.0
3.0
3.0
output, which simpli?es 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
Toko
stability so the designer is free to use ceramic capacitors
A997AS-2R2N
A997AS-3R3N
A997AS-4R7M
2.2
3.3
4.7
1.6
1.2
1.07
0.06
0.07
0.1
1.8
1.8
1.8
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 ampli?er with
Würth
?nite output impedance. The power section, consisting of
7447745022
7447745033
7447745047
7447745076
7447445100
2.2
3.3
4.7
7.6
10
3.5
3.0
2.4
1.8
1.6
0.036
0.045
0.057
0.095
0.12
2.0
2.0
2.0
2.0
2.0
the modulator, power switch and inductor is modeled as a
transconductance ampli?er 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 ampli?er output current,
resulting in two poles in the loop. In most cases, a zero is
required and comes either from the output capacitor ESR
3509fc
15
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| LT3509IDE#PBF | 功能描述:IC REG BUCK ADJ 0.7A DL 14DFN 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 |
| LT3509IDE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.2MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.2MHZ, DFN-14 |
| LT3509IDE#TRPBF | 功能描述:IC REG BUCK ADJ 0.7A DL 14DFN 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 |
| LT3509IDE-PBF | 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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