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| 型号： | LT3508IUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.4A DL 24QFN |
| 标准包装： | 2,500 |
| 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： | 3.7 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 920kHz ~ 1.06MHz |
| 电流 - 输出： | 1.4A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
LT3508
APPLICATIONS INFORMATION
V OUT
100mV/DIV
(AC)
Table 1. Programming the Switching Frequency
SWITCHING FREQUENCY (MHz) R T (k Ω )
2.5 7.50
I L
500mA/DIV
2.2
2
9.76
11.5
2μs/DIV
3508 F02
1.8
1.6
14
16.9
Figure 2. Operation Below V IN(PS) . V IN = 10V, V OUT = 1.8V and
f SW = 1.5MHz
V OUT
100mV/DIV
(AC)
I L
500mA/DIV
1.4
1.2
1
0.9
0.8
0.7
0.6
0.5
0.45
20.5
26.1
33.2
38.3
44.2
52.3
61.9
76.8
88.7
2μs/DIV
3508 F03
0.4
0.35
100
115
Figure 3. Operation Above V IN(PS) . V IN = 18V, V OUT = 1.8V
and f SW = 1.5MHz. Output Ripple and Peak Inductor Current
Increase
0.3
0.25
140
169
Inductor Selection and Maximum Output Current
L = ( V OUT + V F ) ?
Setting the Switching Frequency
The switching frequency is programmed either by driving
the RT/SYNC pin with a logic level SYNC signal or by tying
a resistor from the RT/SYNC pin to ground. A graph for
selecting the value of R T for a given operating frequency
is shown in the Typical Application section. Suggested
programming resistors for various switching frequencies
are shown in Table 1.
Choosing a high switching frequency will allow the smallest
A good ?rst choice for the inductor value is:
1.2μH
f
where V F is the voltage drop of the catch diode (~0.4V)
and f is in MHz. The inductor’s RMS current rating must be
greater than the maximum load current and its saturation
current should be at least 30% higher. For highest ef?ciency,
the series resistance (DCR) should be less than 0.1 Ω .
Table 2 lists several vendors and types that are suitable.
overall solution size. However, at high input voltages the
ef?ciency can drop signi?cantly with increasing switching
frequency. The choice of switching frequency will also
impact the input voltage range, inductor and capacitor
selection, and compensation. See the related sections
Table 2. Inductor Vendors
VENDOR URL
Coilcraft www.coilcraft
Murata www.murata.com
PART SERIES
MSS7341
LQH55D
TYPE
Shielded
Open
for details.
TDK
Toko
www.component.tdk.com
www.toko.com
SLF7045
SLF10145
DC62CB
Shielded
Shielded
Shielded
D63CB
D75C
D75F
Shielded
Shielded
Open
Sumida
www.sumida.com
CR54
CDRH74
CDRH6D38
CR75
Open
Shielded
Shielded
Open
3508fd
10
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| LT3509 | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V 500mA Step-Down Regulator and 200mA LDO |
| LT3509EDE#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 |
| LT3509EDE#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 |
| LT3509EDEPBF | 制造商:Linear Technology 功能描述:Sw. Regulator Dual 700mA 3.6-36V DFN14EP |
| LT3509EDE-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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