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| 型号： | LTM4607IV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/26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
OPERATION
V OUT = 0.8V ?
PowerModuleDescription
The LTM4607 is a non-isolated buck-boost DC/DC power
supply. It can deliver a wide range output voltage from 0.8V
to 24V over a wide input range from 4.5V to 36V, by only
adding the sensing resistor, inductor and some external
input and output capacitors. It provides precisely regulated
output voltage programmable via one external resistor.
The typical application schematic is shown in Figure 18.
The LTM4607 has an integrated current mode buck-boost
controller, ultralow R DS(ON) FETs with fast switching speed
and integrated Schottky diodes. With current mode control
and internal feedback loop compensation, the LTM4607
module has sufficient stability margins and good transient
performance under a wide range of operating conditions
and with a wide range of output capacitors. The operating
frequency of the LTM4607 can be adjusted from 200kHz
to 400kHz by setting the voltage on the PLLFLTR pin.
APPLICATIONS INFORMATION
The typical LTM4607 application circuit is shown in
Figure 18. External component selection is primarily
determined by the maximum load current and output
voltage. Refer to Table 3 for specific external capacitor
requirements for a particular application.
Output Voltage Programming
The PWM controller has an internal 0.8V reference voltage.
As shown in the Block Diagram, a 100k internal feedback
resistor connects V OUT and V FB pins together. Adding a
resistor R FB from the V FB pin to the SGND pin programs
the output voltage:
100k + R FB
R FB
Table 1. R FB Resistor (0.5%) vs Output Voltage
Alternatively, its frequency can be synchronized by an in-
put clock signal from the PLLIN pin. The typical switching
frequency is 400kHz.
The Burst Mode and skip-cycle mode operations can be
enabled at light loads to improve efficiency, while the forced
continuous mode and discontinuous mode operations are
used for constant frequency applications. Foldback current
limiting is activated in an overcurrent condition as V FB
drops. Internal overvoltage and undervoltage compara-
tors pull the open-drain PGOOD output low if the output
feedback voltage exits the ±10% window around the
regulation point. Pulling the RUN pin below 1.6V forces
the controller into its shutdown state.
If an external bias supply is applied on the EXTV CC pin,
then an efficiency improvement will occur due to the re-
duced power loss in the internal linear regulator. This is
especially true at the higher end of the input voltage range.
Operation Frequency Selection
The LTM4607 uses current mode control architecture at
constant switching frequency, which is determined by the
internal oscillator’s capacitor. This internal capacitor is
charged by a fixed current plus an additional current that
is proportional to the voltage applied to the PLLFLTR pin.
The PLLFLTR pin can be grounded to lower the frequency
to 200kHz or tied to 2.4V to yield approximately 400kHz.
When PLLFLTR is left open, the PLLFLTR pin goes low,
forcing the oscillator to its minimum frequency.
A graph for the voltage applied to the PLLFLTR pin vs
frequency is given in Figure 2. As the operating frequency
increases, the gate charge losses will be higher, thus the
efficiency is lower. The maximum switching frequency is
approximately 400kHz.
V OUT
R FB
V OUT
R FB
0.8V
Open
9V
9.76k
1.5V
115k
10V
8.66k
2.5V
47.5k
12V
7.15k
3.3V
32.4k
15V
5.62k
5V
19.1k
16V
5.23k
6V
15.4k
20V
4.12k
8V
11k
24V
3.4k
FREQUENCY SYNCHRONIZATION
The LTM4607 can also be synchronized to an external
source via the PLLIN pin instead of adjusting the voltage on
the PLLFLTR pin directly. The power module has a phase-
locked loop comprised of an internal voltage controlled
9
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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