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MP2492

更新时间： 2024-04-09 19:01:55
品牌 Logo 应用领域
芯源 - MPS /
页数 文件大小 规格书
11页 582K
描述
2A, 55V, 100KHz 降压变换器，具有可调输出限流功能

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MP2492 数据手册

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MP2492–2A,55V, 100kHzWITH PROGRAMMABLE OUTPUT CURRENT LIMIT  
PIN FUNCTIONS  
QFN10 SOIC-8  
Name Description  
Pin #  
Pin #  
Supply Voltage. The MP2492 operates from a +4.5V to +55V unregulated input.  
CIN is needed to prevent large voltage spikes from appearing at the input. Put CIN  
as close to the IC as possible. It is the drain of the internal power device and  
power supply for the whole chip.  
1
1
VIN  
GND Ground. This pin is the voltage reference for the regulated output voltage. For this  
Exposed reason care must be taken in its layout. This node should be placed outside of the  
2
2
Pad  
D1 to CIN ground path to prevent switching current spikes from inducing voltage  
noise into the part, Exposed Pad must be connected to Ground pin.  
3
4
EN  
FB  
On/Off Control Input.  
An external resistor divider from the output to GND, tapped to the FB pin sets the  
output voltage.  
3
4
Connect to an external capacitor used for Soft-Start and compensation for current  
limiting loop.  
5
SS  
6
7
5
6
ISN  
ISP  
Negative Current Sense Input for load current limiting.  
Positive Current Sense  
Power good signal. When FB is less than 90% of 0.8V, PGOOD is low. It is an  
8
PGOOD open-drain output. Use a high value pull-up resistor externally to pull it up to  
system power supply.  
Bootstrap. This capacitor is needed to drive the power switch’s gate above the  
supply voltage. It is connected between SW and BST pins to form a floating  
supply across the power switch driver. An on-chip regulator is used to charge up  
the external boot-strap capacitor. If the on-chip regulator is not strong enough, one  
optional diode can be connected from IN or OUT to charge the external boot-strap  
capacitor.  
9
7
8
BST  
10  
SW  
Switch Output. It is the source of power device.  
MP2492 Rev. 1.0  
12/20/2010  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2010 MPS. All Rights Reserved.  
4
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