STMicroelectronics LM123, LM223, LM323 User Manual

LM123/LM223

LM323

THRE E-TERMINA L 3A-5V

POSITIVE VOLTAG E REGULATORS

■ OUTPUT CURRENT : 3A

■ INTERNAL CURRENT AND THERMAL

LIMITING

■ TYPICAL OUTPUT IMPEDANCE: 0.01Ω

■ MINIMUM INPUT VOLTAGE: 7.5V

■ POWER DISSIPATION: 30W

DESCRIPTION

The LM123, LM223, LM323 are three-terminal
positive voltage regulators with a preset 5V output
and a load driving capability of 3A. New circuit
design and processing techniques are used to
provide the high o utput curren t without sac rificing
the regulation characteristics of lower current
devices.

The 3A regulator is virtually blowout proof.
Current limiting, power limiting and thermal

shut-down provide the same high level of reliability
obtained with these techniqu es in the LM209, 1A
regulator. An overall worst case specification for
the combined effects of input voltage, load
current, ambient temperature, and power

TO-220

TO-3

dissipation ensure that the LM123, LM223, LM323
will perform satisfactorily as a system element.

SCHEMATIC DIAGRAM

Rev. 3

1/11November 2005

LM123-LM223-LM323

Table 1: Absolute Maximum Ratings

Symbol Parameter Value Unit

V

I
P
T

T

oper

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.

Table 2: Thermal Data

Symbol Parameter TO-220 TO-3 Unit

R

thj-case

R

thj-amb

Figure 1: Conn ection Di agram (top view)

Input Voltage

I

Output Current

O

Power Dissipation

tot

Storage Temperature Range

stg

Operating Junction Temperature Range LM123 -55 to 150

LM323 0 to 125

Thermal Resistance Junction-case Max
Thermal Resistance Junction-ambient Max

32°C/W

50 35 °C/W

20 V
Internally Limited
Internally Limited

-65 to 150 °C

°CLM223 -25 to 125

Table 3: Order Codes

TYPE TO-220 TO-3 TEMPERATURE RANGE

LM123 LM123K -55°C to 150°C
LM223 LM223K -25°C to 150°C
LM323 LM323T LM323K 0°C to 125°C

2/11

TO-220

TO-3

LM123-LM223-LM323

Table 4: Electrical Characteristics Of LM123/LM223 (TJ = -55 to 150°C for LM123,

= -25 to 150°C for LM223 unless otherwise specified).

T

J

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Output Voltage Range

O

(Note 2)

V

Output Voltage Range

O

(Note 2)

K

Line Regulation (Note 3) VI = 7.5 to 15 V TJ = 25°C 5 25 mV

VI

Load Regulation (Note 3) IO = 0 to 3 AVI = 7.5 V TJ = 25°C 25 100 mV

K

VO

Quiescent Current VI = 7.5 to 15 V IO = 0 to 3 A 12 20 mA

I

IB

Output Noise Voltage Ta = 25°C f = 10 Hz to 100 KHz 40 µV

V

NO

I

Short Circuit Current Limit VI = 15 V TJ = 25°C 3 4.5 A

OS

Long Term Stability 35 mV

K

VH

Notes: 1. Although power dissipation is internally limited, specifications apply only for P ≤ 30W.

2. Select ed devices with tighten ed t ol erance out put voltage avai l able.

3. Load and line regulation are specif i ed at constant j unction temperature. Pulse testi ng is require d wi t h a pulse width ≤ 1m s and
duty cycle ≤ 5%.

Table 5: Electrical Characteristics Of LM323 (TJ = 0 to 150°C, unless otherwise specified).

Ta = 25°C, VI = 7.5 V, IO = 0 4.7 5 5.3 V

TJ = T

min

to T

max

P ≤ P

max

4.6 5.4 V

VI = 7.5 to 15 V IO = 0 to 3 A

= 7.5 V TJ = 25°C 4 5

V

I

rms

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Output Voltage Range

O

(Note 2)

V

Output Voltage Range

O

(Note 2)
Line Regulation (Note 3) VI = 7.5 to 15 V TJ = 25°C 5 25 mV

K

VI

K

Load Regulation (Note 3) IO = 0 to 3 AVI = 7.5 V TJ = 25°C 25 100 mV

VO

Quiescent Current VI = 7.5 to 15 V IO = 0 to 3 A 12 20 mA

I

IB

Output Noise Voltage Ta = 25°C f = 10 Hz to 100 KHz 40 µV

V

NO

I

Short Circuit Current Limit VI = 15 V TJ = 25°C 3 4.5 A

OS

Long Term Stability 35 mV

K

VH

Notes: 1. Although power dissipation is internally limited, specifications apply only for P ≤ 30W.

2. Select ed devices with tighten ed t ol erance out put voltage avai l able.

3. Load and line regulation are specif i ed at constant j unction temperature. Pulse testi ng is require d wi t h a pulse width ≤ 1m s and
duty cycle ≤ 5%.

Ta = 25°C, VI = 7.5 V, IO = 0 4.8 5 5.2 V

TJ = T

min

to T

max

P ≤ P

max

4.75 5.25 V

VI = 7.5 to 15 V IO = 0 to 3 A

V

= 7.5 V TJ = 25°C 4 5

I

rms

3/11

LM123-LM223-LM323

Figure 2: Output Noise Voltage

Figure 3: Output Impedance

Figure 5: Short Circuit Current

Figure 6: Ripple Rejection

Figure 4: Peak Available Output Current

4/11

Figure 7: Dropout Voltage

LM123-LM223-LM323

Figure 8: Line Transient Response

Figure 9: Output Voltage

Figure 10: Quiescent Current

Figure 11: Load Transient Response

5/11

LM123-LM223-LM323

TYPICAL APPLICATION
Figure 12: Basic 3A Regulator

C1 = Required if regulator is distant from filter capacitors.
CL = Regulator is st able with no lo ad capacitor into resistiv e l oads.

Figure 13: Trimming Output To 5V

6/11

Figure 14: 10A Regulator With Complete Overload Protection

LM123-LM223-LM323

* Selected for 20 mA cu rrent from unr egulated negative supply.
** Solid tantalum.
A = LM101A, LM 201A, LM301A.

Figure 15: Adjustable Regulator 0 - 10V/3A

A1 = LM101A, LM201A, LM301A.
CI = 2µF optional - improves ripple rejection, noise and transient response.

7/11

LM123-LM223-LM323

TO-3 MECHANICAL DATA

DIM.

A 11.85 0.466

B 0.96 1.05 1.10 0.037 0.041 0.043

C 1.70 0.066

D 8.7 0.342

E 20.0 0.787

G 10.9 0.429

N 16.9 0.665

P 26.2 1.031

R 3.88 4.09 0.152 0.161

U 39.5 1.555

V 30.10 1.185

MIN. TYP MAX. MIN. TYP. MAX.

mm. inch

P

A

G

U

V

N

O

B

D

C

E

R

P003C/C

8/11

LM123-LM223-LM323

TO-220 MECHANICAL DAT

DIM.

A 4.40 4.60 0.173 0.181
C 1.23 1.32 0.048 0.051
D 2.40 2.72 0.094 0.107

D1 1.27 0.050

E 0.49 0.70 0.019 0.027

F 0.61 0.88 0.024 0.034
F1 1.14 1.70 0.044 0.067
F2 1.14 1.70 0.044 0.067

G 4.95 5.15 0.194 0.203
G1 2.4 2.7 0.094 0.106
H2 10.0 10.40 0.393 0.409

L2 16.4 0.645
L4 13.0 14.0 0.511 0.551
L5 2.65 2.95 0.104 0.116
L6 15.25 15.75 0.600 0.620
L7 6.2 6.6 0.244 0.260
L9 3.5 3.93 0.137 0.154

DIA. 3.75 3.85 0.147 0.151

MIN. TYP MAX. MIN. TYP. MAX.

mm. inch

A

P011C

9/11

LM123-LM223-LM323

Table 6: Revision History

Date Revision Description of Change s

04-Nov-2005 3 Updated curves, no content change.

10/11

LM123-LM223-LM323

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11/11