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参数资料
| 型号： | MP1484EN-LF-Z |
| 厂商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 5.3 A SWITCHING REGULATOR, 380 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, MS-012BA, SOIC-8 |
| 文件页数： | 6/10页 |
| 文件大小： | 243K |
| 代理商： | MP1484EN-LF-Z |
MP1484 – 3A, 18V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
MP1484 Rev. 0.1
www.MonolithicPower.com
5
12/14/2007
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2007 MPS. All Rights Reserved.
OPERATION
FUNCTIONAL DESCRIPTION
The MP1484 regulates input voltages from
4.75V to 18V down to an output voltage as low
as 0.925V, and supplies up to 3A of load
current.
The MP1484 uses current-mode control to
regulate the output voltage. The output voltage
is measured at FB through a resistive voltage
divider and amplified through the internal
transconductance error amplifier. The voltage at
the COMP pin is compared to the switch current
(measured internally) to control the output
voltage.
The
converter
uses
internal
N-Channel
MOSFET switches to step-down the input
voltage to the regulated output voltage. Since
the high side MOSFET requires a gate voltage
greater than the input voltage, a boost capacitor
connected between SW and BS is needed to
drive the high side gate. The boost capacitor is
charged from the internal 5V rail when SW is low.
When the FB pin voltage exceeds 20% of the
nominal regulation value of 0.925V, the over
voltage comparator is tripped and the COMP
pin and the SS pin are discharged to GND,
forcing the high-side switch off.
LOCKOUT
COMPARATOR
INTERNAL
REGULATORS
IN
EN
+
ERROR
AMPLIFIER
1.2V
OVP
RAMP
CLK
0.925V
7V
0.3V
CURRENT
COMPARATOR
CURRENT
SENSE
AMPLIFIER
1.1V
SHUTDOWN
COMPARATOR
7
COMP 6
SS 8
FB 5
GND
4
OSCILLATOR
110/340KHz
S
R
Q
SW
3
BS
1
IN
5V
2
OVP
IN < 4.10V
EN OK
Zener
+
Q
+
1.5V
+
2.5V
+
--
Figure 1—Functional Block Diagram
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相关代理商/技术参数 |
参数描述 |
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| MP1492 | 制造商:MPS 制造商全称:Monolithic Power Systems 功能描述:2A, 4.2V-16V Input, Fast Transient Synchronous Step-down Converter |
| MP1492DS | 制造商:MPS 制造商全称:Monolithic Power Systems 功能描述:2A, 4.2V-16V Input, Fast Transient Synchronous Step-down Converter |
| MP1492DS-A | 制造商:MPS 制造商全称:Monolithic Power Systems 功能描述:2A, 4.2V-16V Input, Fast Transient Synchronous Step-down Converter |
| MP1492DS-A-LF | 功能描述:直流/直流开关转换器 MP1492DS-A-LF RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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