Datasheet MT501 Datasheet (Mos-Tech) [ru]

Features

 The most easy used linear constant current LED driver
 15mA~ 60mA, 1 to 2 channel constant current

regulator

 No external current setting resistor is needed
 1.5V ~ 12V wide supply voltage range supports self

power structure in lighting application

 Very low dropout voltage

IPN ≦ 40mA → VPN ≒ 0.4V
IPN ＞ 40mA → VPN ≒ 0.6V

 PWM dimming by VDD pin
 2uS/2uS current rising/falling time
 -40℃ ~ 120℃ junction operating temperature
 Cascade-able for higher voltage applications*

( type 1Axx only)

 Current leak/no leak design for lighting/display

Application

 Low chip to chip current skew

IPN ≦ 40mA → chip current skew < ±5%
IPN ＞ 40mA → chip current skew < ±6%

 Less than 1%/V load (or line) regulation
 Minimized footprint
 Green package

* Patent pending

Product Description

MT501 is a simple general purpose current regulation

component that can be easily used in various LED lighting

applications. With the excellent load/line regulation and

minimized chip current skew, MT501 keep LED’s current

very stable even when power or load fluctuate in a wide

range and make light intensity very uniform in large area of

LED light source.

Except power supply function, the VDD pin of MT501 is

output enable (OE) also, and can be used in digital PWM

controlled circuit to achieve more precise current adjusting

in gray level applications.

The minimized power supply voltage let MT501 be used

as a current regulative diode (CRD) when VDD and VP pin

are tight together. This application makes MT501 very easy

to be used. Just like a diode, when this diode is inserted in

LED series, the current in circuit is regulated.

In high supply voltage and low LED load voltage

applications, two or more single channel MT501 (A type)

can be connected in series to share redundant high voltage.

With the unique share voltage technology of MOS-TECH

Semiconductor, the extra redundant voltage can be shared

by each MT501 by a reasonable mechanism. This special

capability let MT501 very suit for the usage of wide range

power supply that many liner type LED drivers cannot work.

Applications

Type A – For lighting application

 General LED lighting
 LCD back lighting
 LED torch / flashlight
 RGB lighting

Type B – For display application (No current leak)

 RGB display pixel driver

Package Type

 SOT 23-3 (single channel, type A/B)

 SOT23-5 (dual channel, type A) – two independent

driver in single package.

 SOT89-3 (single channel, type A, package option)

MOS-TECH Semiconductor Co.,LTD

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LOW POWER LIGHTING LED DRIVER DATA SHEET

MT501

15 ~ 60mA Single/Dual channel LED Driver

V

1 A X X

V

P

N

V

DD

V

1 B X X

V

P

N

V

DD

V

DD1

V

DD2

2 A X X

V

P1

V

P

1AXX
XXXX

V

V

P2

N

V

V

DD

N

Pin Name

Function

VDD

Power supply

VP

Current in

VN

Current out

Part Number: MT501

Example: “1A25” is single channel cascade-able MT501, current 25mA.

“1B25” is single channel NU501, current 25mA

“2A20” is dual channel NU501, current 20mA.

PS: Before you issue your P.O., please contact your agent or

MOS-TECH Semiconductor to make sure the channel and center current

that is available.

Characteristic

Symbol

Rating

Unit

Supply voltage

VDD

0 ~ 16

V

Output voltage

VP

-0.2 ~ 17

V

Output current

IPN

IS** +10%

mA

Power Dissipation (Ta=25°C)

PD

SOT 23

0.25

W

SOT 89

0.7

Thermal Resistance (On PCB, Ta=25°C)

RTH(j-a)

SOT 23

300

°C /W

SOT 89

180

Operating temperature

TOPR

-40~+85

°C

Storage temperature

TSTG

-55~+150

°C

Terminal Description

Ordering Information

Top marking

A xx

x

Channels

Product type

Output current (mA)

Block Diagram per channel and Ideal IV characteristic

V

DD

Ipn

Vp

Vrefence

Vn

Maximum Ratings (T = 25°C)

Ip

Is

Vt Viboost

Type A – IV curve Type B – IV curve

Ip

Iboost

Is

Vp

Vt

Vp

Electrical Characteristics and Recommended Operating Conditions

Characteristic Symb

Supply voltage V

ol Condition Min. Typ. Max. Unit

Room Temp.

DD

Supply current IDD - 100 150 250 uA

Minimum dropout voltage V

Maximum output voltage V

Output breakdown voltage V

Output current I

Leakage I

Line regulation %/V

Load regulation %/V

Thermal regulation

Threshold voltage (Type A only) V

Current boost (Type A only) I

Chip current skew I

**

is output saturation current.

I

S

VDD >=3.8V 0.4 - 0.6 V

PNmin

IPN = I

PNmax

IPN = 0, VDD = 0V - - 17 V

PNBD

S

Leakage

DD

P

0V < VDD < 0.4V,

%/10℃

iboost

boost

Skew

V

DD

Switching Characteristics (T = 25°°°°C)

IS <= 25mA 1.5 - 12

V

>= 1V

PN

IS > 40mA 2.5 - 12

S

- - 0.25 / I

Spec. 15 - 60 mA

Type A 1 - 5 uA

VP = 10V

12V > V

Type B 0 - 0.5 uA

> 1.6V - -

DD

8V > VP > 1.6V - -

V

= VP = 2V - -

DD

IP = IS*1.1 11 12 13 V

VP = V

7 10 13 % * IS

iboost

IPN <= 40mA - - 5

= VP = 2V

IPN > 40mA - - 6

±

±
±

0.5

V IS <= 40mA 2 - 12

PN

1

1

V

%/V

%/V

%/10

℃

%

Characteristic Symbol Condition Min. Typ. Max. Unit

Propagation Delay Time

VDD from “L” to “H”

Output current rising time t

Propagation Delay Time

VDD from “H” to “L”

Output current falling time t

Test Circuit

Function

generator

t

pLH

Rise

t

VP=1V, V

pHL

VP=1V, V

Fall

VP=1V, V

VP=1V, V

V

DD

= 0V → 3V - 1 - uS

DD

= 0V → 3V - 1.5 5 uS

DD

= 3V → 0V - 1 - uS

DD

= 3V → 0V - 1.5 5 uS

DD

+V

R

Load

V

P

MT501

V

N

0.1

0.511.8

2.6

3.4

4.255.8

6.6

7.4

8.299.8

10.6

11.4

12.21313.8

14.6

15.4

16.2

17

V

V

V

V

V

V

V

V

V

V

Timing Waveform

V

DD

V

P

I/V curve

50%

t

Rise

t

50%

10%

50%

pHL

90%

t

Fall

t

pLH

90%

50%

10%

V

DD

DD

MT501

N

P

70.00

60.00

(mA)

50.00

PN

40.00

30.00

20.00

Output current I

10.

00

0.00

Load regulation characteristic (A type)

1A60

1A55

1A2

1A18

1A50

1A30

1A25

0

1A40

1A35

1A45

V

DD

= 3.8V

Output voltage V

PN

(V)

V

DD

Load regulation characteristic (B type)

DD

MT501

N

P

(mA)

PN

1B30

1B25

Output current I

V

= 3.8V

DD

Output voltage V

PN

(V)

70.0

0.9

1.4

1.9

2.4

2.9

3.5

4.4

5.2

6.2

7.2

8.2

9.2

IDD

Vs. V

DD

Characteristic (Room Temp)

V

PN

= 2V

Line regulation characteristic

60.0

50.0

(mA)

PN

40.0

30.0

20.0

Output current I

10.

0

1A60

1A5
1A50

1A45
1A40

1A35

1A30
1A25

1A2

1A18

5

0

V

= 1V

PN

0.0

Supply voltage V

DD

(V)

IDD Vs. Temperature Characteristic

VDD= 5V

(uA)

DD

I

Supply voltage V

DD

(V)

(uA)

DD

I

Temperature (°C)

Application design consideration

MT501 is a linear constant current driver. While this device is designed in lighting system, the heat generation should be

considered. Generally, the higher current designed in system, the higher power will suffer by this

power consuming by MT501 and to increase the whole system efficiency, the drop voltage across

minimized. The following design note can reduce the heat generation from

output constant current and the needed supply voltage (normal operation condition).

1. Drop the power supply voltage as low as possible in the normal operation condition.

2. Get the LEDs in current loop as many as possible in the normal operation condition.

3. Get a voltage sharing resistor in series in current loop .

4. If system power is greater that 24V, it suggests to connect a small SMD type capacitor (0.1uF~10uF) between VDD and

VN pin. That will greatly improve the stability of system.

1AXX

V

V

V

1AXX

V

+24

V

1A20

V

generator

1B20

V

V

V

V

12V

V

V

generator

RGB PWM signal

1B20

V

1B20

V

1B20

V

1B20

1B20

1B20

1B20

1B20

1B20

PWM R

PWM R

PWM G

PWM G

PWM B

PWM B

V

12V

V

12V

V

P

Application Circuits

 5V PWM indicator application

+5V

PWM

DD

MT501

N

V

P

 24V PWM lighting with dimming application

With the special designed character of leak, the A type
NU501 can be used in dimming application even when
system power is higher than the maximum VP voltage.

PWM

generator

V

MT501

P

V

N

DD

 12V

lighting application

V

V

DD

P

MT501 MT501

N

V

DD1 VDD2

P1

V

N

 High voltage drop application

DD

V

P

MT501

V

DD

N

P

MT501

8V ~ 24V

 Parallel application

DD

MT501

V

N

DD

P

MT501

V

N

P

 RGB display pixel application

+5V

PWM

PWM R

V

DD

MT501

V

N

PWM G

V

V

DD

P

MT501 MT501

V

N

PWM B

V

V

P

V

DD

P

V

N

V

DD

P

MT501 MT501 MT501

V

N

V

DD

V

N

DD

P

V

V

P

N

2

V

DD

MT501

V

N

V

P

V

DD

MT501

V

N

V

V

V

P

DD

MT501

V

N

P

N

 36V light tube application

LED Vf = 3.3V ~ 3.5V

V

= 35.5V ~ 40V

LED

Package Dimensions

Taping Specification

 SOT23-3

PACKAGE Q’TY/REEL

SOT23-3 3,000 ea

SOT23-5 3,000 ea

SOP89 1,000 ea

 SOT23-5

 SOT89

MOS-TECH Semiconductor Co.,LTD

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Notes regarding these materials

1. This document is provided for reference purposes only so that Mos-tech customers may select the appropriate
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programs, algorithms, and application circuit examples.

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(4) any other purposes that pose a direct threat to human life
Mos-tech shall have no liability for damages arising out of the uses set forth in the above and purchasers who
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damages arising out of the use of Mos-tech products beyond such specified ranges.

10. Although Mos-tech endeavors to improve the quality and reliability of its products, IC products have specific
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©2010 MOS-TECH Semiconductor Corporation www.mtsemi.com

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ᴀ᭛াᰃখ㗗䆥᭛ˈࠡ义᠔䕑㣅᭛⠜“Cautions”݋᳝ℷᓣᬜ࡯DŽ

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೼ᴀ݀ৌ㾘ᅮⱘֱ䆕㣗ೈݙՓ⫼DŽབᵰ䍙ߎњᴀ݀ৌ㾘ᅮⱘֱ䆕㣗ೈՓ⫼ᯊˈᇍѢ⬅ℸ㗠䗴៤ⱘᬙ䱰ߎ⦄
ⱘџᬙˈᴀ݀ৌᇚϡᡓᢙӏԩ䋷ӏDŽ

10.ᴀ݀ৌϔⳈ㟈࡯Ѣᦤ催ѻકⱘ䋼䞣ৃ䴴ᗻˈԚϔ㠀ᴹ䇈ˈᇐԧѻકᘏӮҹϔᅮⱘὖ⥛থ⫳ᬙ䱰ǃ៪㗙⬅
ѢՓ⫼ᴵӊϡৠ㗠ߎ⦄䫭䇃䖤㸠ㄝDŽЎњ䙓ܡ಴ᴀ݀ৌⱘѻકথ⫳ᬙ䱰៪㗙䫭䇃䖤㸠㗠ᇐ㟈Ҏ䑿џᬙ☿♒
៪䗴៤⼒Ӯᗻⱘᤳ༅ˈᏠᳯᅶ᠋㛑㞾㸠䋳䋷䖯㸠ݫԭ䆒䅵ǃ䞛পᓊ⚻ᇍㄪঞ䖯㸠䰆ℶ䫭䇃䖤㸠ㄝⱘᅝܼ䆒䅵
˄ࣙᣀ⹀ӊ䕃ӊϸᮍ䴶ⱘ䆒䅵˅ҹঞ㗕࣪໘⧚ㄝˈ䖭ᰃ԰Ўᴎ఼㋏㒳ⱘߎֱ䆕DŽ⡍߿ᰃ⠛ᴎⱘ䕃ӊˈ
⬅Ѣ⣀䖯㸠偠䆕ᕜೄ䲒ˈ᠔ҹ㽕∖೼乒ᅶࠊ䗴ⱘ᳔㒜ⱘᴎ఼ঞ㋏㒳Ϟ䖯㸠ᅝܼẔ偠Ꮉ԰DŽ

11. བᵰᡞᴀ䌘᭭᠔䆄䕑ⱘѻકҢ݊䕑ԧ䆒໛Ϟϟˈ᳝ৃ㛑䗴៤၈ܓ䇃৲ⱘ䰽DŽ乒ᅶ೼ᇚᴀ݀ৌѻકᅝ㺙ࠄ
乒ᅶⱘ䆒໛Ϟᯊˈ䇋乒ᅶ㞾㸠䋳䋷ᇚᴀ݀ৌѻક䆒㕂Ўϡᆍᯧ࠹㨑ⱘᅝܼ䆒䅵DŽབᵰҢ乒ᅶⱘ䆒໛Ϟ࠹㨑㗠
䗴៤џᬙᯊˈᴀ݀ৌᇚϡᡓᢙӏԩ䋷ӏDŽ

12.೼᳾ᕫࠄᴀ݀ৌⱘџܜк䴶䅸ৃᯊˈϡৃᇚᴀ䌘᭭ⱘϔ䚼ߚ៪㗙ܼ䚼䕀䕑៪㗙໡ࠊDŽ

13.བᵰ䳔㽕њ㾷݇Ѣᴀ䌘᭭ⱘ䆺㒚ݙᆍˈ៪㗙᳝݊Ҫ݇ᖗⱘ䯂乬ˈ䇋৥ᴀ݀ৌⱘ㧹Ϯにষ䆶DŽ

Keep safety first in your circuit designs!

1. MOS-TECH Semiconductor Corp. puts the maximum effort into making semiconductor products better
and more reliable, but there is always the possibility that trouble may occur with them. Trouble with
semiconductors may lead to personal injury, fire or property damage.
Remember to give due consideration to safety when making your circuit designs, with appropriate
measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of nonflammable material or
(iii) prevention against any malfunction or mishap.

©2010 MOS-TECH Semiconductor Corporation www.mtsemi.com