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参数资料
| 型号： | LT3508IFE#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A DUAL SWITCHING CONTROLLER, 1060 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件页数： | 11/24页 |
| 文件大小： | 365K |
| 代理商： | LT3508IFE#TR |
LT3508
19
3508f
TYPICAL APPLICATIONS
1MHz, 3.3V and 1.8V Outputs with Sequencing
VIN
3.9V TO 16V
BOOST2
LT3508
VIN2
VIN1
SHDN
GND
3508 TA02
RT/SYNC
C7
150pF
C5
10
F
C4
47
F
C1
4.7
F
C2
0.1
F
C3
0.1
F
ON OFF
R6
39k
C6
330pF
R5
47k
R4
11.5k
R8
33.2k
fSW = 1MHz
R1
18.7k
R7
100k
R2
35.7k
R3
15.0k
L2 4.7
H
L1 3.3
H
D1
D2
D3
D4
POWER
GOOD
OUT2
3.3V
1.4A
OUT1
1.8V
1.4A
OUT2
C8
1nF
BOOST1
SW2
SW1
FB2
FB1
VC2
PG1
VC1
TRACK/SS1
PG2
TRACK/SS2
C1 TO C5: X5R OR X7R
D1, D2: MMSD4148
D3: DIODES INC. B140
D4: DIODES INC. B240A
High Temperature Considerations
The die temperature of the LT3508 must be lower than the
maximum rating of 125°C. This is generally not a concern
unless the ambient temperature is above 85°C. For higher
temperatures, care should be taken in the layout of the
circuit to ensure good heat sinking of the LT3508. The
maximum load current should be derated as the ambient
temperature approaches 125°C. The die temperature is
calculated by multiplying the LT3508 power dissipation
by the thermal resistance from junction to ambient. Power
dissipation within the LT3508 can be estimated by calculat-
ing the total power loss from an efciency measurement
and subtracting the catch diode loss. Thermal resistance
depends on the layout of the circuit board, but values
from 30°C/W to 60°C/W are typical. Die temperature rise
was measured on a 4-layer, 6.5cm
× 7.5cm circuit board
in still air at a load current of 1.4A (fSW = 700kHz). For
a 12V input to 3.3V output the die temperature elevation
above ambient was 13°C; for 24VIN to 3.3VOUT the rise
was 18°C; for 12VIN to 5VOUT the rise was 14°C and for
24VIN to 5VOUT the rise was 19°C.
Outputs Greater Than 6V
For outputs greater than 6V, add a resistor of 1k to 2.5k
across the inductor to damp the discontinuous ringing of
the SW node, preventing unintended SW current. The 12V
output circuit in the Typical Applications section shows
the location of this resistor.
Other Linear Technology Publications
Application Notes 19, 35 and 44 contain more detailed
descriptions and design information for step-down regu-
lators and other switching regulators. The LT1376 data
sheet has a more extensive discussion of output ripple,
loop compensation and stability testing. Design Note 318
shows how to generate a dual polarity output supply using
a step-down regulator.
APPLICATIONS INFORMATION
相关PDF资料 |
PDF描述 |
|---|---|
| LT3508EUF | 3.2 A DUAL SWITCHING CONTROLLER, 1060 kHz SWITCHING FREQ-MAX, PQCC24 |
| LT3509HMSE#TRPBF | 1.2 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3509IMSE#PBF | 1.2 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO16 |
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| LT3509EMSE#TRPBF | 1.2 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3508IFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.4A Step-Down Switching Regulator |
| LT3508IUF#PBF | 功能描述:IC REG BUCK ADJ 1.4A DL 24QFN 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 |
| LT3508IUF#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 1MHZ Q 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 1MHZ, QFN-24 |
| LT3508IUF#TRPBF | 功能描述:IC REG BUCK ADJ 1.4A DL 24QFN 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 |
| LT3508IUF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.4A Step-Down Switching Regulator |
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