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| 型号： | LTM4607IV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC BUCK/BOOST SYNC ADJ 5A 141LGA |
| 产品培训模块： | Buck-Boost uModule Regulators High Voltage µModule DC/DC Regulators Power Module vs. Discrete DC to DC |
| 软件下载： | LTM460(5,7) Spice Models LTM4607 Spice Model |
| 产品目录绘图： | LTM Series_15x15x2.8 |
| 设计资源： | LTM4607IV#PBF Footprint.bxl |
| 特色产品： | μModule Products DC/DC μModule Regulator Family |
| 标准包装： | 119 |
| 系列： | µModule® |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 4.5V |
| 电压 - 输入（最大）： | 36V |
| Voltage - Output 1： | 0.8 ~ 24 V |
| 电流 - 输出（最大）： | 5A |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 141-LGA |
| 尺寸/尺寸： | 0.59" L x 0.59" W x 0.11" H（15.0mm x 15.0mm x 2.8mm） |
| 包装： | 托盘 |
| 工作温度： | -40°C ~ 85°C |
| 效率： | 98% |
| 产品目录页面： | 2711 (CN2011-ZH PDF) |
| 配用： | DC1198A-B-ND - BOARD DEMO LTM4607 |
LTM4607
APPLICATIONS INFORMATION
0.6
0.4
0.2
1.5μH
2.5μH
3.3μH
4.7μH
V OUT = 12V
? = 400kHz
to achieve the same output ripples as the buck mode. If
assuming that the ESR dominates the output ripple, the
output ripple is as follows:
Δ V OUT(P-P) = ESR ? I L(MAX)
If a total low ESR about 5mΩ is chosen for output capaci-
tors, the maximum output ripple of 70mV occurs at the
input voltage of 5V with the peak inductor current at 14A.
0
5
6
7
8
9
10
11
12
An RC snubber is recommended on SW1 to obtain low
switching noise, as shown in Figure 17.
INPUT VOLTAGE V IN (V)
4607 F04
Wide Input Mode Operation
R SENSE =
2 ?
+ Δ I L
Figure4.CurrentRippleRatioatDifferentInputsforBoostMode
Figure 4 shows the current ripple ratio at different input
voltages based on the inductor values: 1.5μH, 2.5μH,
3.3μH and 4.7μH. If we need 30% ripple current ratio at
all inputs, the 3.3μH inductor can be selected.
At boost mode, sensing resistor selection is based on
the maximum input current and the allowed maximum
sensing threshold 160mV.
2 ? 160mV
P
η ? V IN(MIN)
Consider the safety margin about 30%, we can choose
the sensing resistor as 7mΩ.
For the input capacitor, only minimum capacitors are
needed to handle the maximum RMS current, since it
is a continuous input current at boost mode. A 100μF
capacitor is only needed if the input source impedance is
compromised by long inductive leads or traces.
Since the output capacitors at boost mode need to filter
the square wave current, more capacitors are expected
If a wide input range is required from 5V to 36V, the mod-
ule will work in different operation modes. If input voltage
V IN = 5V to 36V, V OUT = 12V and ? = 400kHz, the design
needs to consider the worst case in buck or boost mode
design. Therefore, the maximum output power is limited
to 60W. The sensing resistor is chosen at 7mΩ, the input
capacitor is the same as the buck mode design and the
output capacitor uses the boost mode design. Since the
maximum output ripple normally occurs at boost mode
in the wide input mode design, more inductor ripple cur-
rent, up to 150% of the inductor current, is allowed at
buck mode to meet the ripple design requirement. Thus,
a 3.3μH inductor is chosen at the wide input mode. The
maximum output ripple voltage is still 70mV if the total
ESR is about 5mΩ.
Additionally, the current limit may become very high when
the module runs at buck mode due to the low sensing
resistor used in the wide input mode operation.
Safety Considerations
The LTM4607 modules do not provide isolation from V IN
to V OUT . There is no internal fuse. If required, a slow blow
fuse with a rating twice the maximum input current needs
to be provided to protect each unit from catastrophic failure.
15
For more information www.linear.com/LTM4607
4607fc
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM4607V | 制造商:LINER 制造商全称:Linear Technology 功能描述:36VIN, 24VOUT High Effi ciency Buck-Boost DC/DC μModule |
| LTM4608 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low VIN, 8A DC/DC μModuleTM with Tracking, Margining, and Frequency Synchronization |
| LTM4608_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low VIN, 8A DC/DC Module Regulator with Tracking, Margining, and Frequency Synchronization |
| LTM4608A | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low VIN, 8A DC/DC μModule with Tracking, Margining, and Frequency Synchronization |
| LTM4608A_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low VIN, 8A DC/DC Module Regulator with Tracking, Margining, and Frequency Synchronization |
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