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| 型号： | LT1302CS8-5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 5V 0.6A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2 V ~ 8 V |
| PWM 型： | 电流模式，混合 |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1302/LT1302-5
APPLICATIO N S I N FOR M ATIO N
I LOAD 25mA
ally reaches audio frequencies, but at a much lighter load
than without the I T feature. At some input voltage/load
current combinations, some residual bursting may occur
at frequencies out of the audio band.
V OUT
100mV/DIV
AC COUPLED
INDUCTOR
CURRENT
1A/DIV
525mA
The I T pin cannot be used as a soft-start. Large capacitors
connected to the pin will cause erratic operation. If oper-
ating the device in Burst Mode, let the pin float. Keep high
dV/dt signals away from the pin.
Figure 8c details efficiency with and without the addition of
R1. Burst Mode operation keeps efficiency high at light
load with I T floating. Efficiency falls off at light load with
R1 added because the LT1302 cannot transition into Burst
Mode.
Layout
1ms/DIV
1302 F08b
The high speed, high current switching associated with
Figure 8b. 3.3k Resistor from I T Pin to Ground Forces
LT1302 into Current Mode Regardless of Load. Audio
Frequency Component Eliminated
90
the LT1302 mandates careful attention to layout. Follow
the suggested component placement in Figure 9 for proper
operation. High current functions are separated by the
package from sensitive control functions. Feedback resis-
tors R1 and R2 should be close to the feedback pin (pin4).
80
70
60
50
I T FLOATING
3.3k I T TO GND
Noise can easily be coupled into this pin if care is not taken.
A small capacitor (100pF to 200pF) from FB to ground
provides a high frequency bypass. If the LT1302 is oper-
ated off a three-cell or higher input, R3 (2 ? to 10 ? ) in
series with V IN is recommended. This isolates the device
from noise spikes on the input supply. Do not put in R3 if
the device must operate from a 2V input, as input current
40
30
1
10 100
OUTPUT CURRENT (mA)
1000
1302 F08c
will cause the voltage at the LT1302’s V IN pin to go below
2V. The 0.1 μ F ceramic bypass capacitor C3 (use X7R, not
Z5U) should be mounted as close as possible to the
package. When R3 is used, C3 should be a 1 μ F tantalum
Figure 8c. 3.3k Resistor for I T to Ground Increases
Efficiency at Moderate Load, Decreases at Light Load
unit. Grounding should be segregated as illustrated. C3’s
ground trace should not carry switch current. Run a
V IN
R2
C3
5
4
L1
+
C1
R3
2 ?
6
7
LT1302
3
2
R1
200pF
R C
SHUTDOWN
D1
8
1
C C
C2
V OUT
GND (BATTERY AND LOAD RETURN)
1302 F09
Figure 9. Suggested Component Placement for LT1302
11
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相关代理商/技术参数 |
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|---|---|
| LT1302CS8PBF | 制造商:Linear Technology 功能描述:Step up dc-dc converter,LT1302CS8 5V 2A |
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| LT1303CN8 | 功能描述:IC REG BOOST ADJ 0.2A 8DIP 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT1303CN8#PBF | 功能描述:IC REG BOOST ADJ 0.2A 8DIP 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 |
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