Datasheet L7905C, L7905CV, L7905CV-DG, L7905CD2T-TR, L7905CP Datasheet (ST)

Features

■ Output current up to 1.5 A

■ Output voltages of - 5; - 8; - 12; - 15 V

■ Thermal overload protection

■ Short circuit protection

■ Output transition SOA protection

Description

The L79xxC series of three-terminal negative
regulators is available in TO-220, TO-220FP and
D²PAK packages and several fixed output
voltages, making it useful in a wide range of
applications. These regulators can provide local
on-card regulation, eliminating the distribution
problems associated with single point regulation;
furthermore, having the same voltage option as
the L78xx positive standard series, they are
particularly suited for split power supplies. If
adequate heat sinking is provided, they can
deliver over 1.5 A output current. Although
designed primarily as fixed voltage regulators,
these devices can be used with external
components to obtain adjustable voltages and
currents.

L79xxC

Negative voltage regulators

Datasheet − production data

TO-220

D²PAK

TO-220FP

Table 1. Device summary

Order codes

Part numbers

TO-220 D²PAK TO-220FP

L7905C L7905CV L7905CV-DG

L7908C L7908CV L7908CV-DG

L7912C L7912CV L7912CV-DG

L7915C L7915CV L7915CV-DG

1. TO-220 Dual Gauge frame.

May 2012 Doc ID 2149 Rev 21 1/24

This is information on a product in full production.

(1)

(1)

(1)

(1)

L7905CD2T-TR L7905CP - 5 V

L7912CD2T-TR L7912CP - 12 V

L7915CD2T-TR L7915CP - 15 V

Output

voltages

- 8 V

www.st.com

24

Contents L79xxC

Contents

1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2/24 Doc ID 2149 Rev 21

L79xxC Diagram

1 Diagram

Figure 1. Schematic diagram

Doc ID 2149 Rev 21 3/24

Pin configuration L79xxC

2 Pin configuration

Figure 2. Pin connections (top view)

TO-220

TO220FP

D²PAK (any type)

4/24 Doc ID 2149 Rev 21

L79xxC Maximum ratings

3 Maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

for V

= - 5 to - 18 V -35

O

= - 20 to - 24 V -40

for V

O

V

T

P

T

V

I

STG

OP

DC input voltage

I

Output current Internally limited

O

Power dissipation Internally limited

D

Storage temperature range -65 to 150 °C

Operating junction temperature range 0 to 150 °C

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these condition is not implied.

Table 3. Thermal data

Symbol Parameter D²PAK TO-220 TO-220FP Unit

R

thJC

R

thJA

Thermal resistance junction-case 3 5 5 °C/W

Thermal resistance junction-ambient 62.5 50 60 °C/W

Doc ID 2149 Rev 21 5/24

Test circuit L79xxC

4 Test circuit

Figure 3. Test circuit

6/24 Doc ID 2149 Rev 21

L79xxC Electrical characteristics

5 Electrical characteristics

Refer to the test circuits, TJ = 0 to 125 °C, VI = -10 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF
unless otherwise specified.

Table 4. Electrical characteristics of L7905C

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

V

ΔV

ΔV

ΔI

ΔV

eN Output noise voltage B = 10Hz to 100kHz, T

Output voltage TJ = 25°C -4.8 -5 -5.2 V

O

= -5 mA to -1 A, PO ≤ 15 W

I

Output voltage

O

(1)

Line regulation

O

(1)

Load regulation

O

I

Quiescent current TJ = 25°C 3 mA

d

Quiescent current change

d

/ΔT Output voltage drift IO = 5 mA -0.4 mV/°C

O

O

= -8 to -20 V

V

I

V

= -7 to -25 V, TJ = 25°C 100

I

= -8 to -12 V, TJ = 25°C 50

V

I

= 5 mA to 1.5 A, TJ = 25°C 100

I

O

-4.75 -5 -5.25 V

IO = 250 to 750 mA, TJ = 25°C 50

I

= 5 mA to 1 A 0.5

O

VI = -8 to -25 V 1.3

= 25°C 100 µV

J

SVR Supply voltage rejection ΔVI = 10 V, f = 120Hz 54 60 dB

V

I

1. 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.

Dropout voltage IO = 1 A, TJ = 25°C, ΔVO = 100 mV 1.4 V

d

Short circuit current 2.1 A

sc

mV

mV

mA

Doc ID 2149 Rev 21 7/24

Electrical characteristics L79xxC

Refer to the test circuits, TJ = 0 to 125 °C, VI = -14 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF
unless otherwise specified.

Table 5. Electrical characteristics of L7908C

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

V

ΔV

ΔV

ΔI

ΔV

Output voltage TJ = 25°C -7.7 -8 -8.3 V

O

Output voltage

O

(1)

Line regulation

O

(1)

Load regulation

O

I

Quiescent current TJ = 25°C 3 mA

d

Quiescent current change

d

/ΔT Output voltage drift IO = 5 mA -0.6 mV/°C

O

IO = -5 mA to -1 A, PO ≤ 15 W
V

= -11.5 to -23 V

I

V

= -10.5 to -25 V, TJ = 25°C 160

I

= -11 to -17 V, TJ = 25°C 80

V

I

I

= 5 mA to 1.5 A, TJ = 25°C 160

O

= 250 to 750 mA, TJ = 25°C 80

I

O

I

= 5 mA to 1 A 0.5

O

= -11.5 to -25 V 1

V

I

-7.6 -8 -8.4 V

eN Output noise voltage B = 10Hz to 100kHz, TJ = 25°C 175 µV

SVR Supply voltage rejection ΔV

V

I

1. 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.

Dropout voltage IO = 1 A, TJ = 25°C, ΔVO = 100 mV 1.1 V

d

Short circuit current 1.5 A

sc

= 10 V, f = 120Hz 54 60 dB

I

mV

mV

mA

8/24 Doc ID 2149 Rev 21

L79xxC Electrical characteristics

Refer to the test circuits, TJ = 0 to 125 °C, VI = -19 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF
unless otherwise specified.

Table 6. Electrical characteristics of L7912C

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

V

ΔV

ΔV

ΔI

ΔV

Output voltage TJ = 25°C -11.5 -12 -12.5 V

O

Output voltage

O

(1)

Line regulation

O

(1)

Load regulation

O

I

Quiescent current TJ = 25°C 3 mA

d

Quiescent current change

d

/ΔT Output voltage drift IO = 5 mA -0.8 mV/°C

O

IO = -5 mA to -1 A, PO ≤ 15 W
V

= -15.5 to -27 V

I

V

= -14.5 to -30 V, TJ = 25°C 240

I

= -16 to -22 V, TJ = 25°C 120

V

I

I

= 5 mA to 1.5 A, TJ = 25°C 240

O

= 250 to 750 mA, TJ = 25°C 120

I

O

I

= 5 mA to 1 A 0.5

O

= -15 to -30 V 1

V

I

-11.4 -12 -12.6 V

eN Output noise voltage B = 10Hz to 100kHz, TJ = 25°C 200 µV

SVR Supply voltage rejection ΔV

V

I

1. 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.

Dropout voltage IO = 1 A, TJ = 25°C, ΔVO = 100 mV 1.1 V

d

Short circuit current 1.5 A

sc

= 10 V, f = 120Hz 54 60 dB

I

mV

mV

mA

Doc ID 2149 Rev 21 9/24

Electrical characteristics L79xxC

Refer to the test circuits, TJ = 0 to 125 °C, VI = -23 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF
unless otherwise specified.

Table 7. Electrical characteristics of L7915C

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

V

ΔV

ΔV

ΔI

ΔV

Output voltage TJ = 25°C -14.4 -15 -15.6 V

O

Output voltage

O

(1)

Line regulation

O

(1)

Load regulation

O

I

Quiescent current TJ = 25°C 3 mA

d

Quiescent current change

d

/ΔT Output voltage drift IO = 5 mA -0.9 mV/°C

O

IO = -5 mA to -1 A, PO ≤ 15 W
V

= -18.5 to -30 V

I

V

= -17.5 to -30 V, TJ = 25°C 300

I

= -20 to -26 V, TJ = 25°C 150

V

I

I

= 5 mA to 1.5 A, TJ = 25°C 300

O

= 250 to 750 mA, TJ = 25°C 150

I

O

I

= 5 mA to 1 A 0.5

O

= -18.5 to -30 V 1

V

I

-14.3 -15 -15.7 V

eN Output noise voltage B = 10Hz to 100kHz, TJ = 25°C 250 µV

SVR Supply voltage rejection ΔV

V

I

1. 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.

Dropout voltage IO = 1 A, TJ = 25°C, ΔVO = 100 mV 1.1 V

d

Short circuit current 1.3 A

sc

= 10 V, f = 120Hz 54 60 dB

I

mV

mV

mA

10/24 Doc ID 2149 Rev 21

L79xxC Application information

6 Application information

Figure 4. Fixed output regulator

1. To specify an output voltage, substitute voltage value for "XX".

2. Required for stability. For value given, capacitor must be solid tantalum. If aluminium electrolytic are used,
at least ten times value should be selected. C1 is required if regulator is located an appreciable distance
from power supply filter.

3. To improve transient response. If large capacitors are used, a high current diode from input to output
(1N4001 or similar) should be introduced to protect the device from momentary input short circuit.

Figure 5. Split power supply (± 15 V - 1 A)

(*) Against potential latch-up problems.

Doc ID 2149 Rev 21 11/24

Application information L79xxC

Figure 6. Circuit for increasing output voltage

VO=VXX(R1+R2)/R

VXX/R2 > 3I

2

IN OUT

d

C3 Optional for improved transient response and ripple rejection.

IN OUT

GND

GND

Figure 7. High current negative regulator (- 5 V / 4 A with 5 A current limiting)

IN

IN

GND

GND

OUT

OUT

12/24 Doc ID 2149 Rev 21

L79xxC Package mechanical data

7 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of

®

ECOPACK
specifications, grade definitions and product status are available at:
ECOPACK

packages, depending on their level of environmental compliance. ECOPACK®

®

is an ST trademark.

www.st.com

Table 8. TO-220 mechanical data

Type STD - ST Dual Gauge Type STD - ST Single Gauge

Dim.

Min. Typ. Max. Min. Typ. Max.

A 4.40 4.60 4.40 4.60

b 0.61 0.88 0.61 0.88

b1 1.14 1.70 1.14 1.70

c 0.48 0.70 0.48 0.70

D 15.25 15.75 15.25 15.75

D1 1.27

E 10.00 10.40 10.00 10.40

e 2.40 2.70 2.40 2.70

mm. mm.

.

e1 4.95 5.15 4.95 5.15

F 1.23 1.32 0.51 0.60

H1 6.20 6.60 6.20 6.60

J1 2.40 2.72 2.40 2.72

L 13.00 14.00 13.00 14.00

L1 3.50 3.93 3.50 3.93

L20 16.40 16.40

L30 28.90 28.90

∅P 3.75 3.85 3.75 3.85

Q 2.65 2.95 2.65 2.95

Note: In spite of some difference in tolerances, the packages are compatible.

Doc ID 2149 Rev 21 13/24

Package mechanical data L79xxC

Figure 8. Drawing dimension TO-220 (type STD-ST Dual Gauge)

14/24 Doc ID 2149 Rev 21

0015988_S

L79xxC Package mechanical data

Figure 9. Drawing dimension TO-220 (type STD-ST Single Gauge)

8174627_B

Doc ID 2149 Rev 21 15/24

Package mechanical data L79xxC

Figure 10. Drawing dimension tube for TO-220 Dual Gauge (mm)

Figure 11. Drawing dimension tube for TO-220 Single Gauge (mm)

16/24 Doc ID 2149 Rev 21

L79xxC Package mechanical data

H

TO-220FP mechanical data

Dim.

mm. inch.

Min. Typ Max. Min. Typ. Max.

A 4.40 4.60 0.173 0.181

B 2.5 2.7 0.098 0.106

D 2.5 2.75 0.098 0.108

E 0.45 0.70 0.017 0.027

F 0.75 1 0.0300.039

F1 1.15 1.50 0.045 0.059

F2 1.15 1.50 0.045 0.059

G4.95 5.2 0.194 0.204

G1 2.4 2.7 0.094 0.106

H 10.0 10.40 0.393 0.409

L2 16 0.630

L3 28.6 30.6 1.126 1.204

L4 9.8 10.6 0.3850.417

L5 2.93.6 0.114 0.142

L6 15.9 16.4 0.626 0.645

L7 99.3 0.354 0.366

DIA. 33.2 0.118 0.126

7012510A-

Doc ID 2149 Rev 21 17/24

Package mechanical data L79xxC

Figure 12. Drawing dimension D²PAK (type STD-ST)

18/24 Doc ID 2149 Rev 21

0079457/L

L79xxC Package mechanical data

Figure 13. Drawing dimension D²PAK (type WOOSEOK-subcon.)

0079457/L

Doc ID 2149 Rev 21 19/24

Package mechanical data L79xxC

Table 9. D²PAK mechanical data

Type STD-ST Type WOOSEOK-subcon.

Dim.

Min. Typ. Max. Min. Typ. Max.

A 4.40 4.60 4.30 4.70

A1 0.03 0.23 0 0.20

b 0.70 0.93 0.70 0.90

b2 1.14 1.70 1.17 1.37

c 0.45 0.60 0.45 0.50 0.60

c2 1.23 1.36 1.25 1.30 1.40

D 8.95 9.35 9 9.20 9.40

D1 7.50 7.50

E 10 10.40 9.80 10.20

E1 8.50 7.50

e2.54 2.54

e1 4.88 5.28 5.08

H 15 15.85 15 15.30 15.60

J1 2.49 2.69 2.20 2.60

L 2.29 2.79 1.79 2.79

L1 1.27 1.40 1 1.40

mm. mm.

L2 1.30 1.75 1.20 1.60

R0.4 0.30

V2 0° 8° 0° 3°

Note: The D²PAK package coming from the subcontractor WOOSEOK is fully compatible with the

ST's package suggested footprint.

20/24 Doc ID 2149 Rev 21

L79xxC Package mechanical data

Figure 14. D²PAK footprint recommended data

Table 10. Footprint data

Dim. mm. inch.

A 12.20 0.480

B 9.75 0.384

C 16.90 0.665

D 3.50 0.138

E 1.60 0.063

F 2.54 0.100

G 5.08 0.200

Val ues

Doc ID 2149 Rev 21 21/24

Package mechanical data L79xxC

Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data

Dim.

Min. Typ. Max. Min. Typ. Max.

A180 7.086

C 12.8 13.0 13.2 0.504 0.512 0.519

D 20.2 0.795

N60 2.362

T 14.4 0.567

Ao 10.50 10.6 10.70 0.413 0.417 0.421

Bo 15.70 15.80 15.90 0.618 0.622 0.626

Ko 4.804.90 5.00 0.189 0.193 0.197

Po 3.9 4.0 4.1 0.153 0.157 0.161

P 11.9 12.0 12.1 0.468 0.472 0.476

mm. inch.

22/24 Doc ID 2149 Rev 21

L79xxC Revision history

8 Revision history

Table 11. Document revision history

Date Revision Changes

22-Jun-2004 9 Order codes updated Table 3.

31-Aug-2005 10 Add new order codes (TO-220 E Type) on Table 3.

19-Jan-2007 11 D²PAK mechanical data updated and add footprint data.

06-Jun-2007 12 Order codes updated.

25-Oct-2007 13 Modified:

05-Dec-2007 14 Modified:

18-Feb-2008 15 Modified:

15-Jul-2008 16 Modified:

19-Jan-2010 17

26-May-2010 18 Modified: V

12-Nov-2010 19 Modified: R

18-Nov-2011 20

15-May-2012 21 Added: order codes L7908CV-DG

Modified:

page 15

Added: order codes L7905CV-DG, L7912CV-DG and L7915CV-DG

page 1

Figure 3, Figure 4, Figure 6

Ta b l e 1

.

Table 1 on page 1

Table 1 on page 1

Table 8 on page 13

,

Figure 10

I

thJC

.

and

parameter

value for TO-220

.

.

, added:

Figure 11 on page 16

Table 2 on page 5

and

Figure 7

.

Figure 8 on page 14, Figure 9 on

.

.

Table 3 on page 5

Table 1 on page 1

.

.

Ta b l e 1 o n

Doc ID 2149 Rev 21 23/24

L79xxC

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24/24 Doc ID 2149 Rev 21