一 : l

二 : SPX29302T5-L

SPX29300/01/02

October 2010

3A Low Dropout Voltage Regulator

Rev. 2.1.0

GENERAL DESCRIPTION

The SPX29300/01/02 are 3A, highly accurate voltage regulators with a low dropout voltage of 600mV (typical) at 3A.

These regulators are specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. They are fully fault protected against over-current, reverse battery, and positive and negative voltage transients. On-Chip trimming adjusts the reference voltage to 1% initial accuracy.

The SPX29300 is offered in a 3-pin TO-263 package, the SPX29301 is offered in a 5-pin TO-263 while SPX29302 is offered in a 5-pin TO-263 and 5-pin TO-220 packages.

APPLICATIONS

? Adjustable Power Supplies ? Constant Current Regulators ? Audio and Video/Graphic Cards ? Battery Chargers

FEATURES

? 3A Guaranteed Output Current ? Low Dropout Voltage of 600mV @ 3A ? Adjustable Output down to 1.25V ? 1% Output Accuracy

? Tight Load and Line Regulation ? Fast Transient Response ? Reverse Battery Protection

? Zero Current Shutdown (SPX29301/02) ? Power Good Flag (SPX29301)

? Lead Free 3-Pin TO-263, 5-pin TO-220 and TO-263 Packages

TYPICAL APPLICATION DIAGRAM

Fig. 1: SPX29300 and SPX29302 Application Diagrams

Exar Corporation

48720 Kato Road, Fremont CA 94538, USA

Tel. +1 510 668-7000 – Fax. +1 510 668-7001

T5 SPX29302T5-L

SPX29300/01/02

3A Low Dropout Voltage Regulator

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

Input Voltage VIN1 ................................................... 20V Storage Temperature .............................. -65°C to 150°C Lead Temperature (Soldering, 5 sec) ..................... 260°C ESD Rating (HBM - Human Body Model) .......................... All pins except EN ................................................. 2kV En pin ................................................................. 1kV

OPERATING RATINGS

Input Voltage Range VIN ........................................... 16V Junction Temperature Range .................... -40°C to 125°C Thermal Resistance ...................................................... TO-220-5 Junction to Ambient ....................... 29.3°C/W TO-263-3 Junction to Ambient ....................... 31.4°C/W TO-263-5 Junction to Ambient ....................... 31.2°C/W TO-220-5, TO-263-3, TO-263-5 Junction to Case .. 3°C/W

Note 1: Maximum positive supply voltage of 20V must be of limited duration (<100ms) and duty cycle of less than 1%. The maximum continuous supply voltage is 16V.

ELECTRICAL SPECIFICATIONS

Specifications with standard type are for an Operating Junction Temperature of TJ = TA = 25°C only; limits applying over the full Operating Junction Temperature range are denoted by a “?”. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise indicated, VIN = VOUT + 1V and IOUT=10mA, CIN = 6.8μF, COUT = 10μF, TA= 25°C.

Parameter

Fixed Voltage Versions Output Voltage, 1.8V Version Output Voltage, 2.5V Version Output Voltage, 3.3V Version Output Voltage, 5.0V Version All Voltage Versions Line Regulation Load Regulation ΔV/ΔT

Dropout Voltage

Except 1.8V Version (note 3) Ground Current (note 5) Ground Pin Current at Dropout Current Limit

Output Noise Voltage Reference Voltage

Temperature Coefficient

3.0

IOUT=10mA, (VOUT+1V)≤VIN≤16V

VIN=VOUT + 1V, 10mA≤IOUT ≤IFL (note 2) ppm/?C ? VOUT Temp Coefficient (note 6) mV mA

IOUT=100mA IOUT=1.5A ? IOUT=3A IOUT=1.5A

IOUT=3A

1.782 1.764 2.475 2.450 3.267 3.234 4.950 4.900

V V V V

IOUT=10mA

? 10mA≤IOUT≤3A, 2.8V≤VIN≤16V IOUT=10mA

10mA≤IOUT≤3A, 3.5V≤VIN≤16V IOUT=10mA

? 10mA≤IOUT≤3A, 4.3V≤VIN≤16V IOUT=10mA

? 10mA≤IOUT≤3A, 6.0V≤VIN≤16V

Min.

Typ.

Max.

Units

Conditions

VIN = 0.5V less than specified VOUT IOUTVOUT=0V (note 4) μVRMS

ppm/?C

10Hz-100KHz, IOUT=100mA, COUT=10μF 10Hz-100KHz, IOUT=100mA, COUT=33μF Note 7

Reference Voltage and Adjustable Pin - SPX29302

1.228

1.215

Reference Voltage V

1.203 Adjust Pin Bias Current Adjust Pin Bias Current

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Temperature Coefficient

nA

VREF≤VOUT≤(VIN-1), 2.3V≤VIN≤16V 10mA≤IL≤IFL, TJ<TJMAX

?

nA/?C

? 2010 Exar Corporation 2/10

Rev. 2.1.0

T5 SPX29302T5-L

SPX29300/01/02

Parameter

3A Low Dropout Voltage Regulator

Min. 40 25 2.4

Typ.

Max.

Units

Conditions

Power Good Flag Output – SPX29301 Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis

Enable Input – SPX29301/02 Input Logic Voltage Low (OFF) Input Logic Voltage High (ON) Enable Input Pin

Regulator Output Current in Shutdown

V

μA

VIN<10V ? VEN=16V VEN=0.8V ?

μA

mV

mV

95 75

mV

140

VOH=16V

Device set for 5V, VIN=4.5V, IOL=250μA

Device set for 5V, Note 8

Device set for 5V, Note 8 ?

Device set for 5V, Note 8 ? Note 9 Note 2: Full load current (IFL) is defined as 3.0A.

Note 3: Dropout voltage is defined (VIN-VOUT) when the output voltage drops to 99% of its nominal value. Note 4: VIN=VOUT(nom)+1V. Use pulse-testing procedures to minimize temperature rise.

Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current.

Note 6: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range

Note 7: Thermal regulation is defined as the change in output voltage at time T after a change in power dissipation is applied, excluding load/line regulation effects. Specifications for a 200mA load pulse as VIN=20V (a 4W pulse) for t=10ms. Note 8: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured 6V input. To express these thresholds in terms of output voltage change, multiply the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmable output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 383mV. Threshold remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed. Note 9: VEN ≤ 0.8V and VIN ≤ 16V, VOUT = 0.

BLOCK DIAGRAM

Fig. 2: SPX29300/01/02 Block Diagram

? 2010 Exar Corporation 3/10 Rev. 2.1.0

T5 SPX29302T5-L

SPX29300/01/02

3A Low Dropout Voltage Regulator

PIN ASSIGNMENT

Fig. 3: SPX29300/01/02 Pin Assignment

ORDERING INFORMATION

Part Number

Bulk

Lead Free

500/Tape & Reel Lead Free

Bulk

Lead Free

500/Tape & Reel Lead Free

Bulk

Lead Free

500/Tape & Reel Lead Free

Bulk

Lead Free

500/Tape & Reel Lead Free

Bulk

Lead Free

500/Tape & Reel Lead Free

Bulk

Lead Free

500/Tape & Reel Lead Free

Bulk

Lead Free

“YY” = Year – “WW” = Work Week – “L” = Lead Free Designator – “X” = Lot Number

? 2010 Exar Corporation 4/10

Rev. 2.1.0

T5 SPX29302T5-L

SPX29300/01/02

3A Low Dropout Voltage RegulatorTYPICAL PERFORMANCE CHARACTERISTICS All data taken at VIN = VOUT + 1V, TJ = TA = 25°C, unless otherwise specified.

Fig. 4: Dropout Voltage vs Load Current

Fig. 5: Startup

Fig. 6: Line Regulation

IOUT=10mA, VOUT=3.3V

Fig. 7: Load Regulation VOUT=3.3V

? 2010 Exar Corporation 5/10

Rev. 2.1.0

T5 SPX29302T5-L

SPX29300/01/02

3A Low Dropout Voltage Regulator

THEORY OF OPERATION

The SPX29300/01/02 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage.

THERMAL CONSIDERATIONS

Although the SPX29300/01/02 offers limiting circuitry for overload conditions, it is still necessary to insure that the maximum junction temperature is not exceeded in the application. Heat will flow through the lowest resistance path, the junction-to-case path. In order to insure the best thermal flow of the component, proper mounting is required.

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capacitor will guarantee stability over all load conditions.

A tantalum capacitor is recommended if a faster load transient response is needed. If the power source has high AC impedance, a 0.1μF ceramic capacitor between input & ground is recommended.

MINIMUM LOAD CURRENT

To ensure a proper behavior of the regulator under light load, a minimum load of 5mA for SPX29300/01/02 is required.

ADJUSTABLE REGULATOR DESIGN

The SPX29300/01/02 is an adjustable regulator that can be programmed to any value between 1.25V and 16V using 2 external resistors, R1 and R2. The relationship between the resistors and the output voltage is:

??????????????

????????

??1?? TO-220 DESIGN EXAMPLE:

Assume that VIN 10V, VOUT 5V, IOUT = 1.5A, TA = 50°C, θHA= 1°C/W, θCH= 2°C/W, and θJC= 3C°/W, where: TA = ambient temperature,

θHA= heatsink to ambient thermal resistance θCH= case to heatsink thermal resistance θJC = junction to case thermal resistance The power calculated under these conditions is:

??????????????????????????????????????7.5??

And the junction temperature is calculated as

????????????????????????????????????????????

or

??????50??7.5????1??2??3????95°??

Reliable operation is insured.Capacitor Requirements

ERROR FLAG

The SPX29301 features an error flag that indicates either an over current or under current voltage condition. The flag output goes low, sinking 10mA when either conditions occurs.

ENABLE INPUT

The SPX29301/02 has an Enable function that switches the regulator on and off. Their thresholds are TTL compatible. When the regulator is active, approximately 20μA flows through the Enable pin.

TYPICAL APPLICATION CIRCUITS

Figure 1 represents the typical implementation for an adjustable output regulator. The values of R1 and R2 set the output voltage value as follows:

??????????????????????1??

????

?? ??

CAPACITOR REQUIREMENTS

The output capacitor is needed to insure stability and minimize the output noise. The value of the capacitor varies with the load. However, a minimum value of 10μF aluminum

? 2010 Exar Corporation

6/10

A minimum value of 10kohms is recommended for R2 with a range between 10k? and 47k?.

Rev. 2.1.0

T5 SPX29302T5-L

SPX29300/01/02

3A Low Dropout Voltage RegulatorPACKAGE SPECIFICATION 3-PIN TO-263

? 2010 Exar Corporation 7/10

Rev. 2.1.0

T5 SPX29302T5-L

SPX29300/01/02

3A Low Dropout Voltage Regulator5-PIN TO-263

? 2010 Exar Corporation 8/10

Rev. 2.1.0

T5 SPX29302T5-L

SPX29300/01/02

3A Low Dropout Voltage Regulator5-PIN TO-220

? 2010 Exar Corporation 9/10

Rev. 2.1.0

T5 SPX29302T5-L

SPX29300/01/02

3A Low Dropout Voltage RegulatorREVISION HISTORY Revision

1.0.0 Date 12/17/2009 Initial Release of Datasheet

Reformat of datasheet

Inserted ESD data

Modified Dropout Voltage and Ground Current values in electrical characteristics table

Corrected typographical error in result of calculus in note 8

Removed “Gound Current vs Load Current”, “Enable Threshold vs Temperature” and

“Power Supply Rejection Ratio curves”

Updated “Dropout Voltage vs Load Current”, “Line Regulation” and “Load Regulation”

curves Added “start Up” curve

Corrected Adjustable Regulator Design paragraph equation Description 2.0.0 03/31/2010 2.1.0

10/19/2010

FOR FURTHER ASSISTANCE

Exar Technical Documentation:

http://www.exar.com/TechDoc/default.aspx? Email: customersupport@exar.com

EXAR CORPORATION

HEADQUARTERS AND SALES OFFICES

48720 Kato Road

Fremont, CA 94538 – USA

Tel.: +1 (510) 668-7000

Fax: +1 (510) 668-7030

扩展：spx29302t5中文资料 / spx29302t5 / spx29302t5应用电路

www.exar.com

NOTICE

EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies.

EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.

Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.

? 2010 Exar Corporation 10/10

Rev. 2.1.0

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三 : beherewithyouM.L

As if a childish angel came

好像一个孩子气的天使降临

You hummed a song of dream

哼唱着一支梦的歌谣

Light the night,there's a whole starry skyhiding in your eyes
你点亮了黑夜，一整片星空藏在你眼底
We might play different roles in one world
也许我们在这个世界扮演着不同的角**ut we all have the same hope.
但是我们拥有同一个心愿
Just for you.
只为了你
'Cause you're the one showed us what is miracle
因为你让我们懂得什么是奇迹
Every day pray for you hand in hand in hand
手牵手每日为你祈祷
Crowned you with glory in dreamland
在梦之国度用荣耀为你加冕
Our dreams are so young
我们的梦想还很年轻
The days are so long
未来的日子还很漫长
You make us strong
你让我们变得坚强

When the whole world is going to rain
当全世界约好一起下雨
Let us make it clear in our dreams
让我们一起在梦里放晴
Be here with you
一鹿有我
Heart to heart drive away the clouds of gloom
心连心为你驱散乌云
All the pain and tears gone with the wind
所有痛苦和泪水都已随风而逝
You will shine like stars on the stage
你会如璀璨星光在这舞台闪耀
Be here with you
一鹿有我
Hold you dream with out love and make it through
用爱守护你的梦想坚持到底

We can feel your determined strength inside
我们能感受到你内心坚定的力量
Hanged on[www.61k.com] to dream in foreign land
独自一人在异乡坚持自己的梦想
And we know you always try to hide loneliness behindsmile
我们知道你总是用微笑掩饰孤单
When you danced on which belongs to you
当你站在属于你的舞台恣意舞蹈
The sweat ran into your eyes
汗水流进你的双眼
Still smile. You seem to tell us that you're alright
依然微笑着，你似乎在告诉我们你没事
Imagine you playing football with your friends
想象你和朋友驰骋在绿茵场
Imagine you practicing again and again
想象你一遍又一遍地练习
Wherever you are
无论你在哪里
Whatever you do
无论你做什么
Be right here for you
我们永远不离不弃

You show us how it feels to feel therainbow within my reach
你让我们体会到触摸遥不可及的彩虹是什么感觉
And when you fall with the wind,everywhere is paradise
Oh paradise
当你乘坐着风降落在我们的世界
无论何处都是天堂

When the whole world is going to rain
当全世界约好一起下雨
Let us make it clear in our dreams
让我们一起在梦里放晴
Be here with you
一鹿有我
Heart to heart drive away the cloud of gloom
心连心为你驱散乌云
All the pain and tears gone with the wind
所有痛苦和泪水都已随风而逝
We'll always guard you so don't hold back your tears
我们永远守护着你所以别再强忍着泪水
Believe it
请相信
We will be there forever until the whole world end
我们会陪伴着你直到世界尽头
Oh if you smile,the sunshine will flood on all the land.
若你微笑，日光倾城

四 : ；‘’l

不合格vf

五 : L诗

晨雾

晓风绵绵绕松树，

清河潺潺无一物。

雾霭沉沉落一处，

小雨滴滴撒满路。

恋月( 文章阅读网：www.61k.com )

玉盘难成怀中宝，

月光闪耀，

星辰眨眼笑。

枝头柳絮飘过月，

八月会上望明眼。

湖边闹市湖中玉，

湖里明月，

湖外行人闹。

玩月不休闹不停，

只望既望赏满月。

追月

东方渐露洁白玉，

撒满地，光如昼。

霓虹靓灯亦无彩，

微风飘动，星辰失色，

一夜青天亮。

菊花西风无奈落，

心中欢喜追月去，

感叹明月无暇美。

诚然低头，

桥下光影洁白有裂纹。

殇别

自古伤秋离别痛，

如今悲苦竹心残。

落月冷清满寂寞，

晓风无奈尽为泪。]

轮回

忘川河畔开红莲，

轮回百世枯叶帘。

逡巡几载洛阳边，

情伤难回九霄前。。

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