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参数资料
| 型号： | MP2562DS-LF |
| 厂商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 4800 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | ROHS COMPLIANT, MS-012AA, SOIC-8 |
| 文件页数： | 6/20页 |
| 文件大小： | 563K |
| 代理商： | MP2562DS-LF |
MP2562 – 1A, 4MHz, 50V STEP-DOWN CONVERTER
MP2562 Rev. 0.91
www.MonolithicPower.com
14
4/5/2010
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2010 MPS. All Rights Reserved.
High Frequency Operation
The switching frequency of MP2562 can be
programmed up to 4MHz by an external resistor.
Please pay attention to the following if the
switching frequency is above 2MHz.
The minimum on time of MP2562 is about
100ns (typ). Pulse skipping operation can be
seen more easily at higher switching frequency
due to the minimum on time. Recommended
operating voltage is 12V or below, and 24V or
below at 2MHz. Refer to Figure 2 below for
detailed information.
Recommended VIN (max)
vs Switching Frequency
30
25
20
15
10
5
1500 2000 2500 3000 3500 4000
VOUT=3.3V
fs (KHz)
V
IN
(MAX)
(V)
VOUT=2.5V
Figure 2—Recommend Max VIN vs. fS
Since the internal bootstrap circuitry has higher
impedance, which may not be adequate to
charge the bootstrap capacitor during each (1-
D)×Ts charging period, an external bootstrap
charging diode is strongly recommended if the
switching frequency is above 2MHz (see
External Bootstrap Diode section for detailed
implementation information).
With higher switching frequencies, the inductive
reactance (XL) of capacitor comes to dominate,
so that the ESL of input/output capacitor
determines the input/output ripple voltage at
higher switching frequency. As a result of that,
high frequency ceramic capacitor is strongly
recommended as input decoupling capacitor
and output filtering capacitor for such high
frequency operation.
Layout becomes more important when the
device switches at higher frequency. It is
essential
to
place
the
input
decoupling
capacitor, catch diode and the MP2562 (Vin pin,
SW pin and PGND) as close as possible, with
traces that are very short and fairly wide. This
can help to greatly reduce the voltage spike on
SW node, and lower the EMI noise level as well.
Try to run the feedback trace as far from the
inductor and noisy power traces as possible. It
is often a good idea to run the feedback trace
on the side of the PCB opposite of the inductor
with a ground plane separating the two. The
compensation components should be placed
closed to the MP2562. Do not place the
compensation components close to or under
high dv/dt SW node, or inside the high di/dt
power loop. If you have to do so, the proper
ground plane must be in place to isolate those.
Switching loss is expected to be increased at
high switching frequency. To help to improve
the thermal conduction, a grid of thermal vias
can be created right under the exposed pad. It
is recommended that they be small (15mil
barrel diameter) so that the hole is essentially
filled up during the plating process, thus aiding
conduction to the other side. Too large a hole
can cause ‘solder wicking’ problems during the
reflow soldering process. The pitch (distance
between the centers) of several such thermal
vias in an area is typically 40mil. Please refer to
the PCB layout guide and example on EV2562
datasheet.
External Bootstrap Diode
It is recommended that an external bootstrap
diode be added when the input voltage is no
greater than 5V or the 5V rail is available in the
system. This helps improve the efficiency of the
regulator. The bootstrap diode can be a low
cost one such as IN4148 or LL4148.
MP2562
SW
BST
5V
Figure 3—External Bootstrap Diode
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MP2562DS-LF-Z | 功能描述:开关变换器、稳压器与控制器 1A/50V, 4MHz Non-sync Buck RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MP2565DN-LF | 功能描述:开关变换器、稳压器与控制器 2.5A, 4MHz, 50V Step-Down Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MP2565-DN-LF-Z | 制造商:Monolithic Power Systems 功能描述:2.5A, 4MHZ, 50V STEP-DOWN CONVERTER, - Bulk |
| MP2565DN-LF-Z | 功能描述:开关变换器、稳压器与控制器 2.5A, 4MHz, 50V Step-Down Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MP2565DQ-LF-P | 功能描述:开关变换器、稳压器与控制器 2.5A, 4MHz, 50V Step-Down Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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