SPX1117M3-L/TR_技术文档

SPX1117

800mA Low Dropout Voltage Regulator

August 2010

Rev. 2.1.0

GENERAL DESCRIPTION

APPLICATIONS

The SPX1117 is a low power positive-voltage

regulator designed to satisfy moderate power

requirements with a cost effective, small

footprint solution.

 Desktop PC Servers

 Graphic/Video Cards

 Industrial Equipments

 Power Supplies

This device is an excellent choice for use in

battery-powered applications and portable

computers. The SPX1117 features very low

quiescent current and a low dropout voltage of

1.1V at a full load. As output current

decreases, quiescent current flows into the

load, increasing efficiency. SPX1117 is

available in adjustable or fixed 1.5V, 1.8V,

2.5V, 3.3V and 5V output voltages.

FEATURES

 Guaranteed 800mA Output Current

 Guaranteed 1A Peak Current

 Three Terminal Adjustable or Fixed

1.5V, 1.8V, 2.5V, 3.3V and 5V

The SPX1117 is offered in 3-pin SOT-223 and

TO-263 surface mount packages.

 Low Quiescent Current

 Low Dropout Voltage of 1.1V at 800mA

 0.1% Line and 0.2% Load Regulation

 Stable with 2.2µF Ceramic Capacitor

 Overcurrent and Thermal Protection

An output capacitor of 10µF provides

unconditional stability while a smaller 2.2µF

capacitor is sufficient for most applications.

 Lead Free, RoHS Compliant Packages

SOT223 and TO263

FUNCTIONAL DIAGRAM

Fig. 1: SPX1117 Application Diagram

Exar Corporation

www.exar.com

48720 Kato Road, Fremont CA 94538, USA

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

SPX1117

800mA 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.

Power Dissipation................................ Internally Limited

Lead Temperature (Soldering, 5 sec) .....................260°C

Storage Temperature.............................. -65°C to 150°C

Operating Junction Temperature Range...-40°C to +125°C

Input Supply Voltage .............................................. 20V

Input to Output Voltage ........................................18.8V

ESD Rating (HBM - Human Body Model).................... 2kV

ELECTRICAL SPECIFICATIONS

Specifications with standard type are for an Operating Ambient Temperature of T_A= 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 T_J= 25°C, and are provided for

reference purposes only. Unless otherwise indicated, C_IN= C_OUT=10µF, T_A= 25°C.

Parameter

1.5V Version

Min.

Typ.

Max.

Units

Conditions

1.500

1.515

1.530

I_OUT=5mA, V_IN=3.0V, T_J=25°C

1.485

1.470

Output Voltage

1.8V Version

V

•

5mA≤ I_OUT≤800mA, 2.9V≤ V_IN≤10V

1.800

2.500

3.300

5.000

1.250

1.818

1.836

I_OUT=5mA, V_IN=3.3V, T_J=25°C

1.782

1.764

Output Voltage

2.5V Version

V

5mA≤ I_OUT≤800mA, 3.2V≤ V_IN≤10V

2.525

2.550

I_OUT=5mA, V_IN=4.0V, T_J=25°C

2.475

2.450

Output Voltage

3.3V Version

5mA≤ I_OUT≤800mA, 3.9V≤ V_IN≤10V

3.333

3.366

I_OUT=5mA, V_IN=4.8V, T_J=25°C

3.267

3.234

Output Voltage

5.0V Version

5.050

5.100

I

_OUT=5mA, V_IN=6.5V, T_J=25°C

4.950

4.900

Output Voltage

All Voltage Options

Reference Voltage

5mA≤ I_OUT≤800mA, 6.4V≤ V_IN≤12V

1.262

1.270

I_OUT=5mA, (V_IN– V_OUT)=2V, T_J=25°C

1.238

1.225

V

5mA≤I_OUT≤800mA, 1.4V≤(V_IN–V_OUT)≤10V

Output Voltage Temperature

Stability

0.3

3

%

V_INMIN≤ V_IN≤12V, V_OUT= Fixed/Adj.,

Line Regulation (note 1)

Load Regulation (note 1)

7

mV

I

_OUT=5mA

5mA≤ I_OUT≤800mA, V_OUT= Fixed/Adj.

I_OUT=100mA

•

6

12

1.20

1.25

1.30

10

1.00

1.05

1.10

5

Dropout Voltage (note 2)

V

I_OUT=500mA

I_OUT=800mA

Quiescent Current

Adjust Pin Current

Current Limit

mA

µA

4.25V≤ V_IN≤6.5V

50

120

2.0

1.5

0.01

A

(V_IN– V_OUT)=5V

1.0

60

Thermal Regulation

0.1

%/W

25°C, 30ms pulse

f

V

_RIPPLE=120Hz, (V_IN– V_OUT)=2V,

_RIPPLE=1V_PP

Ripple Rejection

75

dB

2/11

Rev. 2.1.0

SPX1117

800mA Low Dropout Voltage Regulator

Parameter

Long Term Stability

Min.

Typ.

Max.

Units

Conditions

125°C, 1000Hrs

% of V_OUT, 10Hz≤f≤10kHz

0.03

%

RMS Output Noise

0.003

Note 1:

For fixed voltage option V_INMIN=V_OUT+1.5V

For adjustable voltage option V_IN-V_OUT=1.4V

Note 2: Dropout voltage is the input voltage minus output voltage that produces a 1% decrease in output voltage with

respect to the nominal output voltage at V_IN=V_OUT+1.5V

PIN ASSIGNMENT

Fig. 2: SPX1117 Pin Assignment (Top View, TAB connected to V_OUT

)

ORDERING INFORMATION

Temperature

Packing

Quantity

Part Number

SPX1117M3-L

Marking

Package

SOT223-3

TO-263-3

Note 1

Note 2

Range

78/Tube

2.5K/Tape & Reel

78/Tube

1117M3

YYWWL

-40°C≤T_J≤+125°C

Lead Free

SPX1117M3-L/TR

SPX1117M3-L-1-5

SPX1117M3-L-1-5/TR

SPX1117M3-L-1-8

SPX1117M3-L-1-8/TR

SPX1117M3-L-2-5

SPX1117M3-L-2-5/TR

SPX1117M3-L-3-3

SPX1117M3-L-3-3/TR

SPX1117M3-L-5-0

SPX1117M3-L-5-0/TR

SPX1117T-L

1117M3

15YYWWL

-40°C≤T_J≤+125°C

2.5K/Tape & Reel

78/Tube

1117M3

18YYWWL

2.5K/Tape & Reel

78/Tube

1117M3

25YYWWL

2.5K/Tape & Reel

78/Tube

1117M3

33YYWWL

2.5K/Tape & Reel

78/Tube

1117M3

50YYWWL

2.5K/Tape & Reel

50/Tube

SPX1117T

YYWWLX

500/Tape & Reel

50/Tube

SPX1117T-L/TR

SPX1117T-L-3-3

SPX1117T

33YYWWLX

500/Tape & Reel

SPX1117T-L-3-3/TR

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

3/11

Rev. 2.1.0

SPX1117

800mA Low Dropout Voltage Regulator

TYPICAL PERFORMANCE CHARACTERISTICS

All data taken at T_A= 25°C, unless otherwise specified - Schematic and BOM from Application Information section of this

datasheet.

Fig. 4: Line Regulation

Fig. 3: Load Regulation

SPX1117M3-L-3-3, I_OUT=10mA

SPX1117M3-L-3-3, V_IN=4.8V

Fig. 6: Current Limit

I_OUTpulsed from 10mA to Current limit

SPX1117M3-L-3-3, V_IN=4.8V, C_IN=C_OUT=2.2µF

Fig. 5: Dropout Voltage vs Output Current

SPX1117M3-L-3-3, V_IN=4.8V, C_OUT=2.2µF

Fig. 8: V_OUTvs Temperature

V_IN=2.5V, I_OUT=10mA

Fig. 7: Current Limit

Output Voltage Deviation

SPX1117M3-L-3-3, I_OUT=10mA to 1A Step

4/11

Rev. 2.1.0

SPX1117

800mA Low Dropout Voltage Regulator

Fig. 9: V_IN=3.0V, I_OUT=10mA

Fig. 10: V_IN=3.3V, I_OUT=10mA

Fig. 11: V_IN=4.0V, I_OUT=10mA

Fig. 12: V_IN=4.85V, I_OUT=10mA

Fig. 14: Output Voltage vs Temperature

Different I_OUT, V_OUT=1.8V (Adj), V_IN=3.3V

Fig. 13: Line Regulation vs Temperature

V_OUT=1.8V (Adj), V_IN=3.3V

Fig. 15: Line Regulation over Temperature

I_LOAD=800mA, V_OUT=1.8V(adj)

5/11

Rev. 2.1.0

SPX1117

800mA Low Dropout Voltage Regulator

APPLICATION INFORMATION

O

UTPUT CAPACITOR

To ensure the stability of the SPX1117, an

output capacitor of at least 2.2µF (tantalum or

ceramic) or 10µF (aluminum) is required. The

value may change based on the application

requirements

of

the

output

load

or

temperature range. The value of ESR can vary

based on the type of capacitor used in the

applications to guarantee stability. The

recommended value for ESR is 0.5Ωor less. A

larger value of output capacitance (up to

100µF) can improve the load transient

response.

Fig. 18

S

OLDERING METHODS

The SPX1117 SOT-223 package is designed to

be compatible with infrared reflow or vapor-

phase reflow soldering techniques. During

soldering, the non-active or mildly active

fluxes may be used. The SPX1117 die is

attached to the heatsink lead which exits

opposite the input, output, and ground pins.

Hand soldering and wave soldering should be

avoided since these methods can cause

damage to the device with excessive thermal

gradients on the package. The SOT-223

recommended soldering method are as

follows: vapor phase reflow and infrared

reflow with the component preheated to within

65C of the soldering temperature range.

Fig. 16: Load Step Response 0mA to 800mA

V_IN=3.3V, V_OUT=1.8V, C_IN=10µF, C_OUT=2.2µF, Ceramic

Signal 1=V_OUT, Signal 4=I_LOAD

T

HERMAL CHARACTERISTICS

The thermal resistance of SPX1117 (SOT-223

package) is 15°C/W from junction to tab and

31°C/W from tab to ambient for a total of 46

°C/W from junction to ambient (Table 1). The

SPX1117 features the internal thermal limiting

to protect the device during overload

conditions. Special care needs to be taken

during continuous load conditions such that

the maximum junction temperature does not

exceed 125 °C. Thermal protection is activated

at >155°C and deactivated at <140 °C.

Taking the FR-4 printed circuit board and 1/16

thick with 1 ounce copper foil as an

experiment (fig.19), the PCB material is

effective at transmitting heat with the tab

attached to the pad area and a ground plane

Fig. 17: Load Step Response 0mA to 800mA

V_IN=3.3V, V_OUT=1.8V, C_IN=10µF, C_OUT=2.2µF, OSCON

Signal 1=V_OUT, Signal 4=I_LOAD

6/11

Rev. 2.1.0

SPX1117

800mA Low Dropout Voltage Regulator

layer on the backside of the substrate. Refer

to table 1 for the results of the experiment.

Where

C: value of capacitor in Farads

F_R: ripple frequency in Hz

The

thermal

interaction

from

other

R1: value of resistor R1 in ohms

components in the application can affect the

thermal resistance of the SPX1117. The actual

thermal resistance can be determined with

experimentation.

If an ADJ-bypass capacitor is used, the

amplitude of the output ripple will be

independent of the output voltage. If an ADJ-

bypass capacitor is not used, the output ripple

will be proportional to the ratio of the output

voltage to the reference voltage:

SPX1117 power dissipation is calculated as

follows:

ꢀ_ꢁꢂ ꢃꢄ ꢇ ꢄ_ꢈꢉꢊꢋ ꢌ ꢍ_ꢈꢉꢊ

ꢅꢆ

ꢄ_ꢈꢉꢊ

ꢧ ꢂ

Maximum Junction Temperature

ꢄ_ꢤꢨꢩ

ꢎ ꢂ ꢎ_{ꢐꢃꢑꢐꢒꢋ}ꢓ ꢀ_ꢁꢌ ꢔꢕꢖꢗꢘꢙꢚ ꢗꢖꢛꢜꢛꢔꢙꢝꢞꢖ ꢃꢟꢞꢔ ꢔꢠ ꢙꢘꢡ. ꢋ

ꢏ

Where M=multiplier for the ripple seen when

the ADJ pin is optimally bypassed.

Maximum junction temperature must not

exceed 125°C.

V_REF=1.25V

Ripple rejection for the adjustable version is

shown in Figure 20.

Fig. 20: Ripple Rejection

V_IN=3.3V, V_OUT=1.8V(adj), I_LOAD=200mA

Fig. 19: Substrate Layout for SOT-223

O

UTPUT VOLTAGE

R

IPPLE REJECTION

The output of the adjustable regulator can be

set to any voltage between 1.25V and 15V.

The value of V_OUTcan be quickly approximated

using the formula

Ripple rejection can be improved by adding a

capacitor between the ADJ pin and ground as

shown in Figure 23. When ADJ pin bypassing

is used, the value of the output capacitor

required increases to its maximum. If the ADJ

pin is not bypassed, the value of the output

capacitor can be lowered to 10μF for an

electrolytic aluminum capacitor or 2.2μF for a

ceramic or solid tantalum capacitor (Fig 22).

ꢥ_ꢦꢓ ꢥ_ꢪ

ꢄ_ꢈꢉꢊꢂ 1.25 ꢌ

ꢥ_ꢦ

A small correction to this formula is required

depending on the values of resistors R1 and

R2, since the adjustable pin current (approx

50μA) flows through R2. When IADJ is taken

into account, the formula becomes

However the value of the ADJ-bypass

capacitor should be chosen with respect to the

following equation:

ꢥ_ꢦꢓ ꢥ

ꢄ_ꢈꢉꢊꢂ ꢄ_ꢤꢨꢩ

ꢌ

^ꢪꢓ ꢍ_ꢐꢁꢏꢌ ꢥ_ꢪ

ꢥ_ꢦ

1

ꢢ ꢂ

Where V_REF=1.25V

6.28 ꢌ ꢣ_ꢤꢌ ꢥ_ꢦ

7/11

Rev. 2.1.0

SPX1117

800mA Low Dropout Voltage Regulator

P

RE-BIAS OUTPUT VOLTAGE START-UP

The SPX1117 is not intended for operations

requiring start-up into a pre-biased load.

Proper discharge of the output voltage is

recommended prior of turning on the device

through the application of the input voltage.

L

AYOUT CONSIDERATIONS

Parasitic line resistance can degrade local

regulation. In order to avoid this, connect R₁

directly to V_OUTas illustrated in figure 25. For

the same reason R₂should be connected to

the negative side of the load.

Fig. 24: 5V Regulator with Shutdown

Fig. 25: Recommended Connections for Best Results

Fig. 21: Current Cource

Thermal

Topside

Copper

mm²

Backside

Copper

mm²

PC Board

mm²

Resistance

Jct to amb.

°C/W

46

47

49

51

53

55

58

59

67

72

85

2500

1250

950

2500

1800

600

1250

915

600

2500

0

2500

1600

2500

1600

900

0

1600

0

900

0

Fig. 22:Typical Adjustable Regulator

240

900

Table 1

Fig. 23: Improving Ripple Rejection

8/11

Rev. 2.1.0

SPX1117

800mA Low Dropout Voltage Regulator

PACKAGE SPECIFICATION

3-PIN SOT-223

9/11

Rev. 2.1.0

SPX1117

800mA Low Dropout Voltage Regulator

3-PIN TO-263

10/11

Rev. 2.1.0

SPX1117

800mA Low Dropout Voltage Regulator

REVISION HISTORY

Revision

Date

Description

06/23/2010

08/24/2011

Reformat of Datasheet

Addition of the Pre-Bias Output Voltage Start-up section

2.0.0

2.1.0

FOR FURTHER ASSISTANCE

Email:

customersupport@exar.com

Exar Technical Documentation:

http://www.exar.com/TechDoc/default.aspx?

E

XAR

CORPORATION

H

EADQUARTERS AND

SALES OFFICES

48720 Kato Road

Fremont, CA 94538 – USA

Tel.: +1 (510) 668-7000

Fax: +1 (510) 668-7030

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.

11/11

Rev. 2.1.0


型号：	SPX1117M3-L/TR
厂家：	EXAR CORPORATION
描述：	800mA Low Dropout Voltage Regulator 800毫安低压差稳压器稳压器调节器光电二极管输出元件
文件：	总11页 (文件大小：749K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SPX1117M3-L/TR [EXAR]

相关型号：

SPX1117M3/TR

SPX1117R

SPX1117R-1-5

SPX1117R-1-5/TR

SPX1117R-1-8

SPX1117R-1-8

SPX1117R-1-8/TR

SPX1117R-1.5

SPX1117R-1.5/TR

SPX1117R-1.8

SPX1117R-1.8/TR

SPX1117R-2-5