Motorola LM350T, LM350BT Datasheet

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The LM350 is an adjustable three–terminal positive voltage regulator
capable of supplying in excess of 3.0 A over an output voltage range of 1.2 V
to 33 V . This voltage regulator is exceptionally easy to use and requires only
two external resistors to set the output voltage. Further, it employs internal
current limiting, thermal shutdown and safe area compensation, making it
essentially blow–out proof.

The LM350 serves a wide variety of applications including local, on card
regulation. This device also makes an especially simple adjustable switching
regulator, a programmable output regulator , or by connecting a fixed resistor
between the adjustment and output, the LM350 can be used as a precision
current regulator.

• Guaranteed 3.0 A Output Current

• Output Adjustable between 1.2 V and 33 V

• Load Regulation Typically 0.1%

• Line Regulation Typically 0.005%/V

• Internal Thermal Overload Protection

• Internal Short Circuit Current Limiting Constant with Temperature

• Output Transistor Safe Area Compensation

• Floating Operation for High Voltage Applications

• Standard 3–lead Transistor Package

• Eliminates Stocking Many Fixed Voltages

THREE–TERMINAL

ADJUSTABLE POSITIVE

VOLTAGE REGULATOR

SEMICONDUCTOR

TECHNICAL DATA

T SUFFIX

PLASTIC PACKAGE

CASE 221A

Pin 1. Adjust

2. V

3. V

1

2

3

Heatsink surface is connected to Pin 2.

out
in

Simplified Application

V

in

Cin*

0.1

µ

F

* = Cin is required if regulator is located an appreciable distance from power supply filter.

** = CO is not needed for stability, however, it does improve transient response.

V

out

Since I

is controlled to less than 100

Adj

this term is negligible in most applications.

MOTOROLA ANALOG IC DEVICE DATA

+

1.25 Vǒ1

I

Adj

LM350

Adjust

)

R

2

R

2

Ǔ

R

1

µ

v

out

R

1

240

+

CO**

µ

1

)

I

AdjR2

A, the error associated with

F

ORDERING INFORMATION

Operating

Device

LM350T
LM350BT# Plastic Power

# Automotive temperature range selections are

available with special test conditions and additional
tests. Contact your local Motorola sales office for
information.

 Motorola, Inc. 1996 Rev 0

Temperature Range

TJ = –40° to +125°C

Package

Plastic PowerTJ = 0° to +125°C

1

LM350

MAXIMUM RATINGS

Rating Symbol Value Unit

Input–Output V oltage Differential VI–V
Power Dissipation P
Operating Junction Temperature Range T
Storage Temperature Range T
Soldering Lead Temperature (10 seconds) T

ELECTRICAL CHARACTERISTICS (V

= 5.0 V; IL = 1.5 A; TJ = T

I–VO

O

D

J

stg

solder

Characteristics

Line Regulation (Note 2)

TA = 25°C, 3.0 V ≤ VI–VO ≤ 35 V

Load Regulation (Note 2)

TA = 25°C, 10 mA ≤ Il ≤ 3.0 A

VO ≤ 5.0 V
VO ≥ 5.0 V

Thermal Regulation, Pulse = 20 ms,

(TA = +25°C)
Adjustment Pin Current 3 I
Adjustment Pin Current Change

3.0 V ≤ VI–VO ≤ 35 V

10 mA ≤ IL ≤ 3.0 A, PD ≤ P

max

Reference Voltage

3.0 V ≤ VI–VO ≤ 35 V

10 mA ≤ IO ≤ 3.0 A, PD ≤ P

max

Line Regulation (Note 2)

3.0 V ≤ VI–VO ≤ 35 V

Load Regulation (Note 2)

10 mA ≤ IL ≤ 3.0 A

VO ≤ 5.0 V
VO ≥ 5.0 V

Temperature Stability (T

low

≤ TJ ≤ T

) 3 T

high

Minimum Load Current to
Maintain Regulation (VI–VO = 35 V)

Maximum Output Current

VI–VO ≤ 10 V, PD ≤ P

VI–VO = 30 V, PD ≤ P
RMS Noise, % of V

TA= 25°C, 10 Hz ≤ f ≤ 10 kHz

max

, TA = 25°C

max

O

Ripple Rejection, VO = 10 V, f = 120 Hz (Note 3)

Without C

C
Long Term Stability, TJ = T

TA= 25°C for Endpoint Measurements

Adj

Adj

= 10 µF

high

(Note 4)

Thermal Resistance, Junction–to–Case

Peak (Note 5)

Average (Note 6)

NOTES: 1. T

to T

low

2.Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately.
Pulse testing with low duty cycle is used.

3.C

Adj

4.Since Long–Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability
from lot to lot.

5.Thermal Resistance evaluated measuring the hottest temperature on the die using an infrared scanner. This method of evaluation yields very
accurate thermal resistance values which are conservative when compared to the other measurement techniques.

6.The average die temperature is used to derive the value of thermal resistance junction to case (average).

= 0° to +125°C; P

high

, when used, is connected between the adjustment pin and ground.

= 25 W for LM350T; T

max

low

to T

35 Vdc

Internally Limited W

–40 to +125 °C
–65 to +150 °C

300 °C

low

to T

high

; P

[Note 1], unless otherwise noted.)

max

Figure Symbol Min Typ Max Unit

1 Reg

2 Reg

Reg

1,2 ∆I

3 V

1 Reg

2 Reg

3 I

3 I

line

load

therm

Adj

Adj

ref

line

load

S

Lmin

max

– 0.0005 0.03 %/V

–
–

5.0

0.1

0.5

– 0.002 – % VO/W

– 50 100 µA
– 0.2 5.0 µA

1.20 1.25 1.30 V

– 0.02 0.07 %/V

–
–

20

0.3

1.5
– 1.0 – % V
– 3.5 10 mA

3.0

0.25

4.5

1.0

N – 0.003 – % V

4 RR

–

66

65
80

3 S – 0.3 1.0 %/1.0 k

R

= –40° to +125°C; P

high

θJC

max

–
–

= 25 W for LM350BT

2.3
–

1.5

25

70

mV

% V

O

mV

% V

O
O

A
–
–

O

dB
–
–

Hrs.

°C/W

–

2

MOTOROLA ANALOG IC DEVICE DATA

310 310 230 120

125K

135

12.4K3.6K

LM350

Representative Schematic Diagram

5.6K

6.7K

5.0pF

12K

6.8K

510

170
160

200

6.3V

13K

6.3V

V

in

6.3V

190

*

30
pF

5.8K

110

5.1K

Figure 1. Line Regulation and ∆I

V

CC

V

IH

VILV

in

LM350

30
pF

2.4K

12.5K

/Line Test Circuit

Adj

Line Regulation (%/V) =

V

out

I

L

VOH – V

V

OL

OL

x 100

105

4

0.45
V

out

Adjust

V

OH

V

OL

C

0.1µF

in

* Pulse Testing Required:

1% Duty Cycle is suggested.

MOTOROLA ANALOG IC DEVICE DATA

I

Adj

Adjust

R

2

1%

240

R

1

1%

+

1

µ

FC

O

R

L

3

LM350

V

in

C

in

* Pulse Testing Required:

1% Duty Cycle is suggested.

0.1

V

in

µ

F

V

in

Figure 2. Load Regulation and ∆I

Load Regulation (% VO) =

Load Regulation (mV) = VO

LM350

I

Adj

Adjust

R

2

1%

V

VO (min Load) – VO (max Load)

VO (min Load)

(min Load)

out

R

I

L

240

1

1%

C

O

Figure 3. Standard T est Circuit

V

LM350

out

/Load Test Circuit

Adj

–VO

(max Load)

+

1.0

µ

F

I

X 100

L

VO (min Load)

VO

(max Load)

R

L

(max Load)

*

R

L

(min Load)

24V
14V

V

I

0.1

C

in

Pulse Testing Required:
1% Duty Cycle is suggested.

f = 120 Hz

µ

F

C

0.1

in

I

Adj

I

SET

Adjust

R

2

1%

To Calculate R2:
V

= I

out

Assume I

R

1

SET R2

SET

240
1%

+ 1.250 V

= 5.25 mA

V

ref

+

1.0

O

µ

R

L

FC

V

O

Figure 4. Ripple Rejection T est Circuit

V

in

µ

F

LM350

Adjust

V

out

240

R

1

1%

I

L

D1 *
1N4002

C

+

1.0µF

O

V

= 10 V

out

R

L

V

O

+

1.65K

R

2

1%

4

**
C

10

Adj

*D1 Discharges C

**C

provides an AC ground to the adjust pin.

Adj

µ

F

if Output is Shorted to Ground.

Adj

MOTOROLA ANALOG IC DEVICE DATA