CYStech Electronics Corp.

Spec. No. : C535E3
Issued Date : 2003.04.08
Revised Date :
Page No. : 1/4

PL7909E3

CYStek Product Specification

3-TERMINAL NEGATIVE VOLTAGE REGULATOR

PL7909XE3

Description

The PL7909XE3 series of three-terminal negative regulators are
available in the TO-220AB package. These regulators can provide
local on-card regulation, eliminating the distribution problems
associated with single point regulation. Each employs internal current
limiting, thermal shutdown and safe operating area protection, making it essentially indestructible.
If adequate heat sinking is provided, they can deliver over 1A output current. Although designed
primarily as fixed voltage regulators, these devices can be used with external components to
obtain adjustable voltages and currents.
PL7909XE3 is characterized for operation from 0

C to +125

C, and if operating temperature is

always high, please refer to the power dissipation curve.

Absolute Maximum Ratings

(Ta=25

Input Voltage ...................................................................................................................... -35 V

Total Power Dissipation .................................................................................... Internally limited

Operating Junction Temperature ....................................................................... 0

C to +125

Maximum Junction Temperature ..................................................................................... 125

Storage Temperature Range .......................................................................... -55

C to +150

Lead Temperature (Soldering 10S) ................................................................................. 230

Typical Application

Schematic Diagram

TO-220AB

PL7909

Vout

Vin

C1 C2

Note:

Bypass Capacitors are
recommended for optimum stability
and transient response and should
be located as close as possible to
the regulator.

1.4k

15K

Vin

750

20K

20pF

10pF

600

15K

20K

10K

6.2V

150

0.2

Vout

GND

CYStech Electronics Corp.

Spec. No. : C535E3
Issued Date : 2003.04.08
Revised Date :
Page No. : 2/4

PL7909E3

CYStek Product Specification

Electrical Characteristics

Vin=-14V, Io=500mA, Cin=2.2uF, Cout=1uF, 0

125

C (unless otherwise noted)

PL7909A

Symbol Parameter

Conditions

Min Typ Max

Units

Tj=25

-8.82 -9 -9.18

Vo Output

Voltage

15W, 5mA I

-11.5VVin -23V

-8.73 -9 -9.27

Tj=25

C, -11.5V Vin-25V

- -

180

Line Regulation

Tj=25

C, -12VVin-20V

- - 90

5mA I

1.5A -

180

Load Regulation

250mA I

750mA -

IQ Quiescent

Current I

1A, Tj=25

- 3 8 mA

5mA I

1A -

0.5

Quiescent Current
Change

-11.5VVin-25V -

1.0

Vo /

Output Voltage Drift

Io=5mA

-0.6

mV/

Output Noise Voltage

Ta=25

C, 10Hz f 100KHz

- 175 - µV

RR Ripple

Rejection

Vi=10V, f=120Hz

54 68 - dB

VD Dropout

Voltage

Tj=25

C, I

=1A

- 2 - V

Isc

Short Circuit Current

Tj=25

C, V

=-35V

- 2.2 - A

Ipk

Peak Output Current

Tj=25

1.3 2.2 -

PL7909B

Symbol Parameter

Conditions

Min Typ Max

Units

Tj=25

-8.64 -9 -9.36

Vo Output

Voltage

15W, 5mA I

-11.5VVin -23V

-8.55 -9 -9.45

Tj=25

C, -11.5V Vin-25V

- -

180

Line Regulation

Tj=25

C, -12VVin-20V

- - 90

5mA I

1.5A -

180

Load Regulation

250mA I

750mA -

IQ Quiescent

Current I

1A, Tj=25

- 3 8 mA

5mA I

1A -

0.5

Quiescent Current
Change

-11.5VVin-25V -

1.0

Vo /

Output Voltage Drift

Io=5mA

-0.6

mV/

Output Noise Voltage

Ta=25

C, 10Hz f 100KHz

- 175 - µV

RR Ripple

Rejection

Vi=10V, f=120Hz

54 68 - dB

VD Dropout

Voltage

Tj=25

C, I

=1A

- 2 - V

Isc

Short Circuit Current

Tj=25

C, V

=-35V

- 2.2 - A

Ipk

Peak Output Current

Tj=25

1.3 2.2 -

CYStech Electronics Corp.

Spec. No. : C535E3
Issued Date : 2003.04.08
Revised Date :
Page No. : 3/4

PL7909E3

CYStek Product Specification

Characteristic Curves

Average Case Power Dissipation as A Function

of Ambient Temperauture

0.1

100

125

150

Ambient Temperature (ºC)

r
D

i
ssi

t
i
on

Peak Output Current as A Function of Input-

Output Differentail Voltage

0.5

1.5

2.5

Input-Output Voltage Differential

u
t
C

u
r
r
e

n
t

Ripple Rejection as A Function of Frequency

100

1000

10000

100000

Frequency

i
p

c
t
i
o

n
(

)

Ripple Rejection as A Function of Output

Voltage

Output Voltage

i
p

c
t
i
o

n
(

)

Output Voltage as A Function of Junction

Temperature

6.06

6.1

6.14

6.18

6.22

6.26

-25

100

125

175

Junction Temperature (ºC)

u
t
V

l
t
a

l
ts

)

CYStech Electronics Corp.

Spec. No. : C535E3
Issued Date : 2003.04.08
Revised Date :
Page No. : 4/4

PL7909E3

CYStek Product Specification

TO-220AB Dimension

*: Typical

Inches Millimeters

DIM

Min. Max. Min. Max.

DIM

Min. Max. Min. Max.

A 0.2197

0.2949 5.58 7.49 I

0.1508

3.83

B 0.3299

0.3504 8.38 8.90 K 0.0295 0.0374 0.75 0.95

C 0.1732 0.185 4.40 4.70 M 0.0449 0.0551 1.14 1.40
D 0.0453

0.0547 1.15 1.39 N

0.1000

2.54

E 0.0138

0.0236 0.35 0.60 O 0.5000

0.5618 12.70 14.27

G 0.3803

0.4047 9.66 10.28 P 0.5701

0.6248 14.48 15.87

H -

0.6398

16.25

Notes:

1.Controlling dimension: millimeters.

2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.
3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.

Material:

Lead: 42 Alloy ; solder plating

Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0

Important Notice:

All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek.

CYStek reserves the right to make changes to its products without notice.

CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.

CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.

Style: Pin 1.Gnd 2.Vin 3.Vout

4.Vin

3-Lead TO-220AB Plastic Package

CYStek Package Code: E3

Marking:

7909

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: PL7918XE3