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参数资料
| 型号： | DC1379A |
| 厂商： | Linear Technology |
| 文件页数： | 9/22页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LTM8025 |
| 软件下载： | LTM8025 Spice Model |
| 设计资源： | DC1379A Design Files DC1379A Schematic |
| 标准包装： | 1 |
| 系列： | µModule® |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 3A |
| 输入电压： | 5.5 ~ 36 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 250kHz ~ 2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM8025 |
| 相关产品： | LTM8025IV#PBF-ND - IC CONVERTER BUCK 3A ADJ 70LGA LTM8025MPV#PBF-ND - IC CONVERTER BUCK 3A ADJ 70LGA LTM8025EV#PBF-ND - IC CONVERTER BUCK 3A ADJ 70LGA |
LTM8025
BLOCK DIAGRAM
V IN
8.2μH
V OUT
0.2μF
15pF
499k
4.4μF
AUX
BIAS
RUN/SS
SHARE
SYNC
CURRENT
MODE
CONTROLLER
GND
RT
PGOOD
ADJ
8025 BD
OPERATION
The LTM8025 is a standalone nonisolated step-down
switching DC/DC power supply that can deliver up to 3A of
output current. This module provides a precisely regulated
output voltage programmable via one external resistor
from 0.8V to 25V. The input voltage range is 3.6V to 36V.
Given that the LTM8025 is a step-down converter, make
sure that the input voltage is high enough to support the
desired output voltage and load current.
As shown in the Block Diagram, the LTM8025 contains a
current mode controller, power switching element, power
inductor, power Schottky diode and a modest amount of
input and output capacitance. The LTM8025 is a fixed
frequency PWM regulator. The switching frequency is set
by simply connecting the appropriate resistor value from
the RT pin to GND.
An internal regulator provides power to the control circuitry.
The bias regulator normally draws power from the V IN
pin, but if the BIAS pin is connected to an external volt-
age higher than 2.8V, bias power will be drawn from the
external source (typically the regulated output voltage).
This improves efficiency. The RUN/SS pin is used to place
the LTM8025 in shutdown, disconnecting the output and
reducing the input current to less than 1μA.
To further optimize efficiency, the LTM8025 automatically
switches to Burst Mode ? operation in light load situations.
Between bursts, all circuitry associated with controlling
the output switch is shut down reducing the input supply
current to 50μA in a typical application.
The oscillator reduces the LTM8025’s operating frequency
when the voltage at the ADJ pin is low. This frequency
foldback helps to control the output current during start-
up and overload.
The LTM8025 contains a power good comparator which
trips when the ADJ pin is at roughly 90% of its regulated
value. The PGOOD output is an open-collector transistor
that is off when the output is in regulation, allowing an
external resistor to pull the PGOOD pin high. Power good is
valid when the LTM8025 is enabled and V IN is above 3.6V.
The LTM8025 is equipped with a thermal shutdown that
will inhibit power switching at high junction tempera-
tures. The activation threshold of this function, however,
is above 125°C to avoid interfering with normal operation.
Thus, prolonged or repetitive operation under a condition
in which the thermal shutdown activates may damage or
impair the reliability of the device.
8025fc
For more information www.linear.com/LTM8025
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DC1379B | 制造商:Linear Technology 功能描述:BOARD EVAL LTM8025 制造商:Linear Technology 功能描述:EVAL BOARD, LTM8025 BUCK REGULATOR, Silicon Manufacturer:Linear Technology, Silicon Core Number:LTM8025, Kit Application Type:Power Management - Voltage Regulator, Application Sub Type:Synchronous Buck Regulator , RoHS Compliant: NA |
| DC1381B01XC_D4X WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DC1383A-A | 功能描述:BOARD DELTA SIGMA ADC LTC2451 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:QuikEval™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| DC1384A-A | 功能描述:BOARD DELTA SIGMA ADC LTC2452 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:QuikEval™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| DC1385A | 功能描述:BOARD EVAL LTM4614 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:µModule® 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
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