ST MICROELECTRONICS L 4940 V5 Datasheet

®

VERY LOW DROP 1.5 A REGULATORS

■ PRECISE 5 V, 8.5 V, 10 V, 12 V OUTPUTS

■ LOW D RO P O U T V O LT A G E ( 500 m V ty p

at 1.5A )

■ VERY LOW QUIESCENT CURRENT

■ THERMAL SHUTDOWN

■ SHORT CIRCUIT PROTECTION

■ REVERSE POLARITY PROTECTION

DESCRIP TION

The L4940 series of three terminal positive
regulators is available in TO-220 and D
package and with several fixed output voltages,
making it useful in a wide range of industrial and
consumer applications. Thanks to its very low
input/output voltage drop, these devices are
particularly suitable for battery powered
equipments, reducing consumption and
prolonging battery life. Each type employs
internal current limiting, antisaturation circuit,
thermal shut-down and safe area protection.

2

PAK

TO-220

L4940 series

D2PAK
TO-263

BLOCK DIAG RAM

September 1998

1/13

L4940 series

PIN CONNECT ION AND ORDER CO DE S

ORDERING NUMBERS OUTPUT VOLTAGE

TO-220 D

L4940V5 L4940D2T5 5V
L4940V85 L4940D2T85 8.5V
L4940V10 L4940D2T10 10V
L4940V12 L4940D2T12 12V

ABSOLUTE MAXIMUM RATING

2

PAK

Symbol Description Values Unit

V

Forward Input Voltage 30 V

I

V

Reverse Input Voltage

IR

I

O utpu t Curr ent Internally Limited

O

P

Power Dissipation Internally Limited

tot

T

, T

j

Junction and Storage Temperature -40 to 150

stg

= 5 V RO = 100 Ω

V

O

V

= 8.5 V RO = 180 Ω

O

= 10 V RO = 200 Ω

V

O

= 12 V RO = 240 Ω

V

O

-15 V

THERMAL DATA

Symbol Description Value Unit

2

PAK

3

62.5

o
o

R

thj-case

R

thj-amb

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

TO-220 D

3

50

o

C

C/W
C/W

2/13

TEST CIRCUITS
Figure 1 : DC Parameter.

Figure 2 : Load Rejection.

L4940 series

Figure 3 : Ripple Rejection.

3/13

L4940 series

ELECTRICAL CHARACTERISTICS FOR L4940V5 (refer to the test circuit s, Tj = 25 oC,

V

= 7V, Ci = 0.1 µF, Co = 22 µF unless otherwise specified)

i

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Output Voltage Io = 500 mA 4.9 5 5.1 V

V

o

Output Voltage Io = 5 mA to 1500 mA

V

o

Operating Input Voltage Io = 5 mA 17 V

V

i

Line Regulation Io = 5 mA Vi = 6 to 17 V 4 10 mV

∆V

o

Load Regulation Io = 5 to 1500 mA

∆V

o

Quiescent Current Io = 5 mA

I

Q

Quiescent Current Change Io = 5 mA

∆I

Q

Output Voltage Drift 0.5 mV/oC

V

∆

o

∆

T

SVR Supply Voltage Rejection I

Dropout Voltage Io = 0.5 A

V

d

I

Short Circuit Current Vi = 14 V

sc

V

= 6.5 to 16 V

i

I

= 500 to 1000 mA

o

I

= 1.5 A Vi = 6.5 V

o

I

= 1.5 A Vi = 6.5 to 16 V

o

= 1 A f = 120 Hz 58 68 dB

o

I

= 1.5 A

o

V

= 6.5 V

i

4.8 5 5.2 V

8
5

5

30

25
15

8

50

3

15

200
500

2

2.2

400
900

2.7

2.9

mV

mA

mA

mV

A

ELECTRICAL CHARACTERISTICS FOR L4940V85 (refer to the test circuit s, Tj = 25 oC,
V

= 10.5V, Ci = 0.1 µF, Co = 22 µF unless otherwise specified)

i

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Output Voltage Io = 500 m A 8.3 8.5 8.7 V

V

o

Output Voltage Io = 5 mA to 1500 mA

V

o

Operating Input Voltage Io = 5 mA 17 V

V

i

Line Regulation Io = 5 mA Vi = 9.5 to 17 V 4 9 mV

∆V

o

Load Regulation Io = 5 to 1500 mA

∆V

o

Quiescent Current Io = 5 mA

I

Q

Quiescent Current Change Io = 5 mA

∆I

Q

Output Voltage Drift 0.8 mV/oC

V

∆

o

∆

T

SVR Supply Voltage Rejection I

Dropout Voltage Io = 0.5 A

V

d

I

Short Circuit Current Vi = 14 V

sc

V

= 10.2 to 16 V

i

I

= 500 to 1000 mA

o

I

= 1.5 A Vi = 10.2 V

o

I

= 1.5 A Vi = 10.2 to 16 V

o

= 1 A f = 120 Hz 58 66 dB

o

I

= 1.5 A

o

V

= 10.2 V

i

8.15 8.5 8.85 V

12

8
4

30

30
16

8

50

2.5
15

200
500

2

2.2

400
900

2.7

2.9

mV

mA

mA

mV

A

4/13

L4940 series

ELECTRICAL CHARACTERISTICS FOR L4940V10 (refer to the test circuit s, Tj = 25 oC,

V

= 12V, Ci = 0.1 µF, Co = 22 µF unless otherwise specified)

i

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Output Voltage Io = 500 mA 9.8 10 10.2 V

V

o

Output Voltage Io = 5 mA to 1500 mA

V

o

Operating Input Voltage Io = 5 mA 17 V

V

i

Line Regulation Io = 5 mA Vi = 11 to 17 V 3 8 mV

∆V

o

Load Regulation Io = 5 to 1500 mA

∆V

o

Quiescent Current Io = 5 mA

I

Q

Quiescent Current Change Io = 5 mA

∆I

Q

Output Voltage Drift 1 mV/oC

V

∆

o

∆

T

SVR Supply Voltage Rejection I

Dropout Voltage Io = 0.5 A

V

d

I

Short Circuit Current Vi = 14 V

sc

V

= 11.7 to 16 V

i

I

= 500 to 1000 mA

o

I

= 1.5 A Vi = 11.7 V

o

I

= 1.5 A Vi = 11.7 to 16 V

o

= 1 A f = 120 Hz 56 62 dB

o

I

= 1.5 A

o

V

= 11.7 V

i

9.6 10 10.4 V

15
10

4

30

35
20

8

50

2

13

200
500

2

2.2

400
900

2.7

2.9

mV

mA

mA

mV

A
A

ELECTRICAL CHARACTERISTICS FOR L4940V12 (refer to the test circuit s, Tj = 25 oC,
V

= 14V, Ci = 0.1 µF, Co = 22 µF unless otherwise specified)

i

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Output Voltage Io = 500 m A 11.75 12 12.25 V

o

V

Output Voltage Io = 5 mA to 1500 mA

o

V

Operating Input Voltage Io = 5 mA 17 V

i

Line Regulation Io = 5 mA Vi = 13 to 17 V 3 7 mV

∆V

o

Load Regulation Io = 5 to 1500 mA

∆V

o

I

Quiescent Current Io = 5 mA

Q

Quiescent Current Change Io = 5 mA

∆I

Q

Output Voltage Drift 1.2 mV/oC

V

∆

o

∆

T

SVR Supply Voltage Rejection I

V

Dropout Voltage Io = 0.5 A

d

I

Short Circuit Current Vi = 14 V 2 2.7 A

sc

Z

Output Impedance f = 1KHz Io = 0.5A 40

o

V

= 13.8 to 17 V

i

I

= 500 to 1000 mA

o

I

= 1.5 A Vi = 13.8 V

o

I

= 1.5 A Vi = 13.8 to 16 V

o

= 1 A f = 120 Hz 55 61 dB

o

I

= 1.5 A

o

11.5 12 12.5 V

15
10

4

30

35
25

8

50

1.5
10

200
500

400
900

mV

mA

mA

mV

mΩ

5/13

L4940 series

Figure 4 : Dropout voltage vs. Output Current. Figure 5 : Dropout Voltage vs. Temperature.

Figure 6 : Output voltage vs. Temperature

(L4940V5).

Figure 8 : Output voltage vs. Temperature
(L4040V10).

Figure 7 : Output Voltage vs. Temperature
(L4940V85).

Figure 9 : Output Voltage vs. Temperature
(L4940V12).

6/13

L4940 series

Figure 10 : Quiescent Current vs. Temperature

(L4940V5).

Figure 12 : Quiescent Current vs. Output Current
(L4940V5).

Figure 11 : Quiescent Current vs. Input Voltage
(L4940V5).

Figure 13 : Short-circuit Current vs. Temperature
(L4940V5).

Figure 14 : Peak Output Current vs.
Input/Output Differential V oltage (L4940V5).

Figure 15 : Low Voltage Behavior (L4940V5 ).

7/13

L4940 series

Figure 16 : Low Voltage Behavior (L4940V85). Figure 17 : Low Voltage Behavior (L4940V10).

Figure 18 : Low Voltage Behavior (L4940V12). Figure 19 : Supply Voltage Rejection vs.

Frequency (L4940V5).

Figure 20 : Supply Voltage Rejection vs.
output Current.

8/13

Figure 21 : Load Dump Char acteristics
(L4940V5 ).

L4940 series

Figure 22 : Line Transient Response (L4940V5). Figure 23 : Load Transient Response.

Figure 24 : Total Power Dissipation.

Figure 25 : Distributed Supply with On-card L4940 and L4941 Low-drop Regulators.

9/13

L4940 series

Figure 26 : Distributed Supply with On-card L4940 and L4941 Low-drop Regulators.

ADVANTAGES OF THESE APPLICA TIO NS ARE :
On card regulation with short-circuit and thermal protection on each output.

Very high total system effic iency due to the switching preregulation and very low-drop postregulations.

Figure 27.

ADVANTAGES OF THIS CONFIGURATIO N ARE :
Very high regulation (line and load) on both the output voltages.

12 V output short-circuit and thermally protected.
Very high efficiency on the 12 V output due to the very low drop regulator.

10/13

TO-220 MECHANICAL DATA

L4940 series

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 4.8 0.189
C 1.37 0.054
D 2.4 2.8 0.094 0.110

D1 1.2 1.35 0.047 0.053

E 0.35 0.55 0.014 0.022
F 0.61 0.94 0.024 0.037

F2 1.15 1.4 0.045 0.055

G 4.95 5.08 5.21 0.195 0.200 0.205
H2 10.4 0.409
H3 10.05 10.4 0.396 0.409

L2 16.2 0.638
L3 26.3 26.7 27.1 1.035 1.051 1.067
L5 2.6 3 0.102 0.118
L6 15.1 15.8 0.594 0.622
L7 6 6.6 0.236 0.260

Dia. 3.65 3.85 0.144 0.152

mm inch

P011D

11/13

L4940 series

TO-263 (D2PAK) MECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 4.3 4.6 0.169 0.181
A1 2.49 2.69 0.098 0.106

B 0.7 0.93 0.027 0.036
B2 1.25 1.4 0.049 0.055

C 0.45 0.6 0.017 0.023
C2 1.21 1.36 0.047 0.053

D 8.95 9.35 0.352 0.368

E 10 10.28 0.393 0.404

G 4.88 5.28 0.192 0.208

L 15 15.85 0.590 0.624

L2 1.27 1.4 0.050 0.055
L3 1.4 1.75 0.055 0.068

mm inch

E

A

C2

L2

D

L

L3

B2

B

A1

C

G

P011P6/C

12/13

L4940 series

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subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
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13/13