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