LM305A - National Semiconductor

TL/H/7755

LM105/LM205/LM305/LM305A, LM376 Voltage Regulators

January 1995

LM105/LM205/LM305/LM305A,

LM376 Voltage Regulators

General Description

The LM105 series are positive voltage regulators similar to

the LM100, except that an extra gain stage has been added

for improved regulation. A redesign of the biasing circuitry

removes any minimum load current requirement and at the

same time reduces standby current drain, permitting higher

voltage operation. They are direct, plug-in replacements for

the LM100 in both linear and switching regulator circuits

with output voltages greater than 4.5V. Important character-

istics of the circuits are:

YOutput voltage adjustable from 4.5V to 40V

YOutput currents in excess of 10A possible by adding

external transistors

YLoad regulation better than 0.1%, full load with current

limiting

YDC line regulation guaranteed at 0.03%/V

YRipple rejection on 0.01%V

Y45 mA output current without external pass transistor

(LM305A)

Like the LM100, they also feature fast response to both load

and line transients, freedom from oscillations with varying

resistive and reactive loads and the ability to start reliably on

any load within rating. The circuits are built on a single sili-

con chip and are supplied in a TO-99 metal can.

The LM105 is specified for operation for b55§CsTAs

a125§C, and the LM305/LM305A is specified for 0§CsTA

sa70§C.

Schematic and Connection Diagrams

TL/H/7755–1

Metal Can Package

TL/H/7755–3

Top View

Order Number LM105H, LM105H/883,

SMD Ý5962-8958801, LM305H or LM305AH

See NS Package Number H08C

C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

(Note 5)

LM105 LM305 LM305A

Input Voltage 50V 40V 50V

Input-Output Differential 40V 40V 40V

Power Dissipation (Note 1) 800 mW 800 mW 800 mW

Operating Temperature Range b55§Ctoa

125§Cb0§Ctoa

70§C0

Ctoa

70§C

Storage Temperature Range b65§Ctoa

150§Cb65§Ctoa

150§C

Lead Temperature (Soldering, 10 seconds) 300§C 300§C 300§C

Electrical Characteristics (Note 2)

Parameter Conditions LM105 LM305 LM305A Units

Min Typ Max Min Typ Max Min Typ Max

Input Voltage Range 8.5 50 8.5 40 8.5 50 V

Output Voltage Range 4.5 40 4.5 30 4.5 40 V

Input-Output Voltage 3.0 30 3.0 30 3.0 30 V

Differential

Load Regulation RSC e10X,T

Ae25§C 0.02 0.05 0.02 0.05 %

(Note 3) RSC e10X,T

AeT

A(MAX) 0.03 0.1 0.03 0.1 %

RSC e10X,T

AeT

A(MIN) 0.03 0.1 0.03 0.1 %

0sIOs12 mA 0 sIOs12 mA

RSC e0X,T

Ae25§C 0.02 0.2 %

RSC e0X,T

Ae70§C 0.03 0.4 %

RSC e0X,T

Ae0

C 0.03 0.4 %

0sIOs45 mA

Line Regulation TAe25§C %/V

0§CsTAsa70§C %/V

VIN bVOUT s5V, TAe25§C 0.025 0.06 0.025 0.06 0.025 0.06 %/V

VIN bVOUT t5V, TAe25§C 0.015 0.03 0.015 0.03 0.015 0.03 %/V

Temperature Stability TA(MIN) sTAsTA(MAX) 0.3 1.0 0.3 1.0 0.3 1.0 %

Electrical Characteristics (Note 2) (Continued)

Parameter Conditions LM105 LM305 LM305A Units

Min Typ Max Min Typ Max Min Typ Max

Feedback Sense Voltage 1.63 1.7 1.81 1.63 1.7 1.81 1.55 1.7 1.85 V

Output Noise Voltage 10 Hz sfs10 kHz

CREF e0 0.005 0.005 0.005 %

CREF e0.1 mF 0.002 0.002 0.002 %

Standby Current Drain VIN e30V, TAe25§C mA

VIN e40V 0.8 2.0 mA

VIN e50V 0.8 2.0 0.8 2.0 mA

Current Limit TAe25§C, RSC e10X,225 300 375 225 300 375 225 300 375 mV

Sense Voltage VOUT e0V, (Note 4)

Long Term Stability 0.1 0.1 0.1 %

Ripple Rejection CREF e10 mF, f e120 Hz 0.003 0.003 0.003 %/V

iJA TO-99 Board Mount 230 230 230 §C/W

in Still Air

iJA TO-99 Board Mount in 92 92 92 §C/W

400 LF/Min Air Flow

iJC TO-99 25 25 25 §C/W

Note 1: The maximum junction temperature of the LM105 and LM305A is 150§C, and the LM305 is 85§C. For operation at elevated temperatures, devices in the

H08C package must be derated based on a thermal resistance of 168§C/W junction to ambient, or 25§C/W junction to case. Peak dissipations to 1W are allowable

providing the dissipation rating is not exceeded with the power average over a five second interval for the LM105 and averaged over a two second interval for the

LM305.

Note 2: Unless otherwise specified, these specifications apply for temperatures within the operating temperature range, for input and output voltages within the

range given, and for a divider impedance seen by the feedback terminal of 2 kX. Load and line regulation specifications are for a constant junction temperature.

Temperature drift effects must be taken into account separately when the unit is operating under conditions of high dissipation.

Note 3: The output currents given, as well as the load regulation, can be increased by the addition of external transistors. The improvement factor will be roughly

equal to the composite current gain of the added transistors.

Note 4: With no external pass transistor.

Note 5: Refer to RETS105X Drawing for military specifications for the LM105.

Typical Performance Characteristics LM105/LM305/LM305A

Load Regulation Load Regulation Characteristics

Current Limiting

Current Limit Sense Voltage Short Circuit Current Values

Optimum Divider Resistance

Minimum Input Voltage Regulator Dropout Voltage Supply Voltage Rejection

Minimum Output Voltage Standby Current Drain Transient Response

TL/H/7755–6

Typical Applications

10A Regulator with Foldback Current Limiting

²Solid tantalum.

*Electrolytic

TL/H/7755–4

1.0A Regulator with Protective Diodes

²Protects against shorted input or inductive leads on

unregulated supply.

*Protects against input voltage reversal.

³Protects against output voltage reversal.

TL/H/7755–5

Linear Regulator with Foldback Current Limiting

TL/H/7755–8

Current Regulator

TL/H/7755–9

Typical Applications (Continued)

Shunt Regulator

TL/H/7755–10

Switching Regulator

²Solid tantaium.

³125 turns e22 on Arnold

Engineering A262123-2

molybdenum permally

core. TL/H/7755–11

Basic Positive Regulator with Current Limiting

TL/H/7755–12

1.0A Regulator with Protective Diodes

²Protects against shorted

input or inductive loads on

unregulated supply.

*Protects against input

voltage reversal.

³Protects against output

voltage reversal.

TL/H/7755–13

Linear Regulator with Foldback Current Limiting

TL/H/7755–14

LM105/LM205/LM305/LM305A, LM376 Voltage Regulators

Physical Dimensions inches (millimeters)

Metal Can Package (H)

Order Number LM105H, LM105H/883, SMD Ý5962-8958801, LM305H or LM305AH

NS Package Number H08C

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with instructions for use provided in the labeling, can effectiveness.

be reasonably expected to result in a significant injury

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