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参数资料
| 型号： | LTC1174CN8-5#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | 0.300 INCH, LEAD FREE, PLASTIC, DIP-8 |
| 文件页数： | 3/20页 |
| 文件大小： | 251K |
| 代理商： | LTC1174CN8-5#TRPBF |
11
LTC1174
LTC1174-3.3/LTC1174-5
1174fe
Figure 7. LTC1174 Layout Diagram (See Board Layout Checklist)
APPLICATIO S I FOR ATIO
WU
UU
Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1174. These items are also illustrated graphically in
the layout diagram in Figure 7. Check the following in your
layout:
1. Is the Schottky catch diode
closely connected between
ground (Pin 4) and switch (Pin 5)?
2. Is the “+” plate of CIN closely connected to VIN (Pin 6)?
This capacitor provides the AC current to the internal
P-channel MOSFET.
3. Is the 0.1
F VIN decoupling capacitor closely conected
between VIN (Pin 6) and ground (Pin 4)? This capacitor
carries the high frequency peak currents.
4. Is the SHUTDOWN (Pin 8) actively pulled to VIN during
normal operation? The SHUTDOWN pin is high imped-
ance and must not be allowed to float.
5. Is the IPGM (Pin 7) pulled either to VIN or ground? The
IPGM pin is high impedance and must not be allowed
to float.
3
LTC1174
2
SW
R1
8
7
6
1
5
4
L
VOUT
D
1174 F07
OUTPUT DIVIDER
REQUIRED WITH
ADJUSTABLE
VERSION ONLY
0.1
F
LBOUT
LBIN
GND
SHUTDOWN
IPGM
VIN
R2
BOLD LINES INDICATE
HIGH CURRENT PATH
VIN
CIN
COUT
VOUT
(VFB)
+
DESIGN EXAMPLE
As a design example, assume VIN = 9V (nominal), VOUT =
5V, and IOUT = 350mA maximum. The LTC1174-5 is used
for this application, with IPGM (Pin 7) connected to VIN. The
minmum value of L is determined by assuming the
LTC1174-5 is operating in continuous mode.
Figure 8. Continuous Inductor Current
INDUCTOR
CURRENT
TIME
IPEAK
IV
AVG CURRENT = IOUT
=
= 350mA
IPEAK + IV
2
1174 F08
With IOUT = 350mA and IPEAK = 0.6A (IPGM = VIN), IV =
0.1A.The peak-to-peak ripple inductor current, IRIPPLE, is
0.5A and is also equal to:
I
VV
L
A
RIPPLE
OUT
D
PP
=
+
()
410 6
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相关代理商/技术参数 |
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| LTC1174CS8#PBF | 功能描述:IC REG BUCK INV ADJ 1A 8SOIC 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 |
| LTC1174CS8#TR | 功能描述:IC REG BUCK INV ADJ 1A 8SOIC RoHS:否 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 |
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