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| 型号： | LTC3403EDD |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.3 V ~ 3.5 V |
| 输入电压： | 2.5 V ~ 5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 600mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3403
APPLICATIO S I FOR ATIO
Table 1. Representative Surface Mount Inductors
The selection of C OUT is driven by the required effective
Part
Number
Sumida
CDRH2D11
Value
( μ H)
1.5
2.2
3.3
DCR
( ? MAX)
0.068
0.098
0.123
MAX DC
Current (A)
0.90
0.78
0.60
Size
WxLxH (mm 3 )
3.2 x 3.2 x 1.2
series resistance (ESR). Typically, once the ESR require-
ment for C OUT has been met, the RMS current rating
generally far exceeds the I RIPPLE(P-P) requirement. The
output ripple V OUT is determined by:
? V OUT L ? ESR +
Sumida
CDRH2D18/LD
Sumida
2.2
3.3
4.7
2.2
0.041
0.054
0.078
0.116
0.85
0.75
0.63
0.95
3.2 x 3.2 x 2.0
3.5 x 4.1 x 0.8
? ? I
?
?
1 ?
8 f C OUT ? ?
CMD4D06
Murata
LQH32C
Taiyo Yuden
LQLBC2518
Toko
D412F
3.3
4.7
1.0
2.2
4.7
1.0
1.5
2.2
2.2
3.3
4.7
0.174
0.216
0.060
0.097
0.150
0.080
0.110
0.130
0.14
0.20
0.22
0.77
0.75
1.00
0.79
0.65
0.78
0.66
0.60
1.14
0.90
0.80
2.5 x 3.2 x 2.0
1.8 x 2.5 x 1.8
4.6 x 4.6 x 1.2
where f = operating frequency, C OUT = output capacitance
and I L = ripple current in the inductor. For a fixed output
voltage, the output ripple is highest at maximum input
voltage since I L increases with input voltage.
Aluminum electrolytic and dry tantalum capacitors are
both available in surface mount configurations. In the case
of tantalum, it is critical that the capacitors are surge tested
for use in switching power supplies. An excellent choice is
the AVX TPS series of surface mount tantalum. These are
specially constructed and tested for low ESR so they give
C IN and C OUT Selection
In continuous mode, the source current of the top MOSFET
is a square wave of duty cycle V OUT /V IN . To prevent large
voltage transients, a low ESR input capacitor sized for the
maximum RMS current must be used. The maximum
RMS capacitor current is given by:
the lowest ESR for a given volume. Other capacitor types
include Sanyo POSCAP, Kemet T510 and T495 series, and
Sprague 593D and 595D series. Consult the manufacturer
for other specific recommendations.
The bulk capacitance values in Figure 1(a) (C IN = 10 μ F,
C OUT = 4.7 μ F) are tailored to mobile phone applications, in
which the output voltage is expected to slew quickly
C IN required I RMS ? I OMAX
[ V OUT ( V IN – V OUT )] 1 / 2
V IN
according to the needs of the power amplifier. Holding the
output capacitor to 4.7 μ F facilitates rapid charging and
discharging. When the output voltage descends quickly in
This formula has a maximum at V IN = 2V OUT , where I RMS
= I OUT /2. This simple worst-case condition is commonly
used for design because even significant deviations do not
offer much relief. Note that the capacitor manufacturer’s
ripple current ratings are often based on 2000 hours of life.
This makes it advisable to further derate the capacitor, or
choose a capacitor rated at a higher temperature than
forced continuous mode, the LTC3403 will actually pull
current from the output until the command from V REF is
satisfied. On alternate half cyles, this current actually exits
the V IN terminal, potentially causing a rise in V IN and
forcing current into the battery. To prevent deterioration
of the battery, use sufficient bulk capacitance with low
ESR; at least 10 μ F is recommended.
required. Always consult the manufacturer if there is any
question.
3403f
10
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| LTC3403EDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN 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: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 |
| LTC3403EDD#TR | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN 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 |
| LTC3403EDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN 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: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 |
| LTC3404 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.4MHz High Efficiency Monolithic Synchronous Step-Down Regulator |
| LTC3404EMS8 | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP 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 |
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