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參數(shù)資料
| 型號： | LM20145 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 5A, PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator |
| 中文描述： | 第5A，頻率可調(diào)的PowerWise㈢同步降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 1/22頁 |
| 文件大?。?/td> | 601K |
| 代理商： | LM20145 |
November 1, 2007
LM20145
5A, PowerWise
Adjustable Frequency Synchronous Buck
Regulator
General Description
The LM20145 is a full featured adjustable frequency syn-
chronous buck regulator capable of delivering up to 5A of
continuous output current. The current mode control loop can
be compensated to be stable with virtually any type of output
capacitor. For most cases, compensating the device only re-
quires two external components, providing maximum flexibil-
ity and ease of use. The device is optimized to work over the
input voltage range of 2.95V to 5.5V making it suited for a wide
variety of low voltage systems.
The device features internal over voltage protection (OVP)
and over current protection (OCP) circuits for increased sys-
tem reliability. A precision enable pin and integrated UVLO
allows the turn-on of the device to be tightly controlled and
sequenced. Start-up inrush currents are limited by both an
internally fixed and externally adjustable Soft-Start circuit.
Fault detection and supply sequencing is possible with the
integrated power good circuit.
The LM20145 is designed to work well in multi-rail power
supply architectures. The output voltage of the device can be
configured to track a higher voltage rail using the SS/TRK pin.
If the output of the LM20145 is pre-biased at startup it will not
sink current to pull the output low until the internal soft-start
ramp exceeds the voltage at the feedback pin.
The frequency of this device can be adjusted from 250 kHz to
750 kHz by connecting an external resistor from the RT pin to
ground.
The LM20145 is offered in a 16-pin eTSSOP package with an
exposed pad that can be soldered to the PCB, eliminating the
need for bulky heatsinks.
Features
■
Input voltage range 2.95V to 5.5V
■
Accurate current limit minimizes inductor size
■
97% peak efficiency
■
Adjustable switching frequency (250 kHz to 750 kHz)
■
32 m
integrated FET switches
■
Starts up into pre-biased loads
■
Output voltage tracking
■
Peak current mode control
■
Adjustable output voltage down to 0.8V
■
Adjustable Soft-Start with external capacitor
■
Precision enable pin with hysteresis
■
Integrated OVP, UVLO, power good and thermal
shutdown
■
eTSSOP-16 exposed pad package
Applications
■
Simple to design, high efficiency point of load regulation
from a 5V or 3.3V bus
■
High Performance DSPs, FPGAs, ASICs and
microprocessors
■
Broadband, Networking and Optical Communications
Infrastructure
Typical Application Circuit
30030701
PowerWise
is a registered trademark of National Semiconductor Corporation.
2007 National Semiconductor Corporation
300307
www.national.com
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM20145_08 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:5A, PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator |
| LM20145CS-A | 制造商:CEC Industries 功能描述:LED, RPL, BULB, AMBER, T-6, E12, Lamp Base Type:Candelabra Screw, LED Color:Ambe |
| LM20145CS-B | 制造商:CEC Industries 功能描述:LED, RPL, BULB, BLUE, T-6, E12; Lamp Base Type:Candelabra Screw; LED Color:Blue; Wavelength Typ:470nm; Power Rating:720mW; Bulb Size:T-6; Supply Voltage:145V; Current Rating:30mA; Average Bulb Life:100000h; Beam Divergence:360 ;RoHS Compliant: No |
| LM20145CS-G | 制造商:CEC Industries 功能描述:LED, RPL, BULB, GREEN, T-6, E12; Lamp Base Type:Candelabra Screw; LED Color:Green; Wavelength Typ:525nm; Power Rating:720mW; Bulb Size:T-6; Supply Voltage:145V; Current Rating:30mA; Average Bulb Life:100000h; Beam Divergence:360 ;RoHS Compliant: No |
| LM20145CS-R | 制造商:CEC Industries 功能描述:LED, RPL, BULB, RED, T-6, E12; Lamp Base Type:Candelabra Screw; LED Color:Red; Wavelength Typ:629nm; Power Rating:720mW; Bulb Size:T-6; Supply Voltage:145V; Current Rating:30mA; Average Bulb Life:100000h; Beam Divergence:360 ;RoHS Compliant: No |
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