L7918ACD2T - STMicroelectronics, Inc.

1/13June 2004

■OUTPUT CURRENT TO 1.5A

■OUTPUT VOLTAGES OF -5; -6; -8; -1 2 ; - 15;

-18; -20; -24V

■THERMAL OVERLOAD PROTECTION

■SHORT CIRCUIT PROTECTION

■OUTPUT TRANSITION SOA PROTECTION

DESCRIPTION

The L7900AC series of three-terminal negative

regulators is available in TO-220 and D2PAK

packages and several fixed output voltages.

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 L7800A positive standard series, they are

particularly suited for split power supplies. If

adequate heat sinking is provided, they can

deliver over 1.5A out put current.

Although designed primarily as fixed voltage

regulators, these devices can be used with

external components to obtain adjustable voltages

and currents.

L7900AC

SERIES

2% NEGATIVE V OLTAGE REGULATORS

SCHEMATIC DIAGRAM

TO-220

D2PAK

Rev. 7

L7900AC SERIES

2/13

Table 1: Absolute Maximum Ratings

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is

not implie d.

Table 2: Therm al Data

Fi gure 1: Conn ect i on Diagr am (top view)

Table 3: Orde ring Codes

(* ) A vailable in Tape & Reel with the suffix "-TR".

(* *) Availab l e on Request.

Symbol Parameter Value Unit

VIDC Input Voltage for VO = -5 to -18V -35 V

for VO = -20, -24V -40

IOOutput Current Internally Limited

Ptot Power Dissip ation Internally Limited

Tstg Storage Temperature Range -65 to 150 °C

Top Operating Junction Temperature Range 0 to 125 °C

Symbol Parameter D2PAK TO-220 Unit

Rthj-case Thermal Resistance Junction-case Max 33°C/W

Rthj-amb Thermal Resistance Junction-ambient Max 62.5 50 °C/W

TYPE TO-220 D2PAK (*) OUTPUT VOLTAGE

L7905AC L7905ACV L7905ACD2T -5 V

L7906AC L7906ACV (**) L7906ACD2T (**) -6 V

L7908AC L7908ACV L7908ACD2T -8 V

L7912AC L7912ACV L7912ACD2T -12 V

L7915AC L7915ACV L7915ACD2T (**) -15 V

L7918AC L7918ACV (**) L7918ACD2T (**) -18 V

L7920AC L7920ACV L7920ACD2T (**) -20 V

L7924AC L7924ACV L7924ACD2T (**) -24 V

TO-220 D2PAK

L7900AC SERIE S

3/13

Fi gure 2: Ap plica tio n Cir cuits

Table 4: Electrical Characteristics Of L7905A (refer to the test circuits, TJ = 0 t o 125° C, VI = -1 0V,

IO = 500 mA, CI = 2.2 µ F , CO = 1 µF unless otherwise specified).

(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effect s must be taken int o acc ount

separately. Pulse testing with low duty cycle is used.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VOOutput Voltage TJ = 25°C -4.9 -5 -5.1 V

VOOutput Voltage IO = -5 mA to -1 A PO ≤ 15W

VI = 8 to 20 V -4.8 -5 -5.2 V

∆VO(*) Line Regulation VI = -7 to -25 V TJ = 25°C 100 mV

VI = -8 to -12 V TJ = 25°C 50

∆VO(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 100 mV

IO = 250 to 750 mA TJ = 25°C 50

IdQuiescent Current TJ = 25°C 3 mA

∆IdQuiescent Current Change IO = 5 mA to 1 A 0.5 mA

VI = -8 to -25 V 1.3

∆VO/∆T Output Voltage Drift IO = 5 mA -0.4 mV/°C

eN Output Noise Voltage B = 10Hz to 100KHz TJ = 25°C 100 µV

SVR Supply Voltage Rejection ∆VI = 10 V f = 120Hz 54 60 dB

VdDropout Voltage IO = 1 A TJ = 25°C ∆VO = 100

mV 1.4 V

Isc Short Circuit Current 2.1 A

Iscp Short Circuit Peak Current TJ = 25°C 2.5 A

L7900AC SERIES

4/13

Table 5: Electrical Characteristics Of L7906A (refer to the test circuits, TJ = 0 t o 125° C, VI = -1 1V,

IO = 500 mA, CI = 2.2 µ F , CO = 1 µF unless otherwise specified).

(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effect s must be taken int o acc ount

separately. Pulse testing with low duty cycle is used.

Table 6: Electrical Characteristics Of L7908A (refer to the test circuits, TJ = 0 t o 125° C, VI = -1 4V,

IO = 500 mA, CI = 2.2 µ F , CO = 1 µF unless otherwise specified).

(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effect s must be taken int o acc ount

separately. Pulse testing with low duty cycle is used.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VOOutput Voltage TJ = 25°C -5.88 -6 -6.12 V

VOOutput Voltage IO = -5 mA to -1 A PO ≤ 15W

VI = -9.5 to -21.5 V -5.76-6-6.24V

∆VO(*) Line Regulation VI = -8.5 to -25 V TJ = 25°C 120 mV

VI = -9 to -15 V TJ = 25°C 60

∆VO(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 120 mV

IO = 250 to 750 mA TJ = 25°C 60

IdQuiescent Current TJ = 25°C 3 mA

∆IdQuiescent Current Change IO = 5 mA to 1 A 0.5 mA

VI = -9.5 to -25 V 1.3

∆VO/∆T Output Voltage Drift IO = 5 mA -0.6 mV/°C

eN Output Noise Voltage B = 10Hz to 100KHz TJ = 25°C 144 µV

SVR Supply Voltage Rejection ∆VI = 10 V f = 120Hz 54 60 dB

VdDropout Voltage IO = 1 A TJ = 25°C ∆VO = 100

mV 1.4 V

Isc Short Circuit Current 2 A

Iscp Short Circuit Peak Current TJ = 25°C 2.5 A

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VOOutput Voltage TJ = 25°C -7.84 -8 -8.16 V

VOOutput Voltage IO = -5 mA to -1 A PO ≤ 15W

VI = -11.5 to -23 V -7.68-8-8.32V

∆VO(*) Line Regulation VI = -10.5 to -25 V TJ = 25°C 160 mV

VI = -11 to -17 V TJ = 25°C 80

∆VO(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 160 mV

IO = 250 to 750 mA TJ = 25°C 80

IdQuiescent Current TJ = 25°C 3 mA

∆IdQuiescent Current Change IO = 5 mA to 1 A 0.5 mA

VI = -11.5 to -25 V 1

∆VO/∆T Output Voltage Drift IO = 5 mA -0.6 mV/°C

eN Output Noise Voltage B = 10Hz to 100KHz TJ = 25°C 175 µV

SVR Supply Voltage Rejection ∆VI = 10 V f = 120Hz 54 60 dB

VdDropout Voltage IO = 1 A TJ = 25°C ∆VO = 100

mV 1.1 V

Isc Short Circuit Current 1.5 A

Iscp Short Circuit Peak Current TJ = 25°C 2.5 A

L7900AC SERIE S

5/13

Table 7: Electrical Characteristics Of L7912A (refer to the test circuits, TJ = 0 t o 125° C, VI = -1 9V,

IO = 500 mA, CI = 2.2 µ F , CO = 1 µF unless otherwise specified).

(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effect s must be taken int o acc ount

separately. Pulse testing with low duty cycle is used.

Table 8: Electrical Characteristics Of L7915A (refer to the test circuits, TJ = 0 t o 125° C, VI = -2 3V,

IO = 500 mA, CI = 2.2 µ F , CO = 1 µF unless otherwise specified).

(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effect s must be taken int o acc ount

separately. Pulse testing with low duty cycle is used.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VOOutput Voltage TJ = 25°C -11.75 -12 -12.25 V

VOOutput Voltage IO = -5 mA to -1 A PO ≤ 15W

VI = -15.5 to -27 V -11.5 -12 -12.5 V

∆VO(*) Line Regulation VI = -14.5 to -30 V TJ = 25°C 240 mV

VI = -16 to -22 V TJ = 25°C 120

∆VO(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 240 mV

IO = 250 to 750 mA TJ = 25°C 120

IdQuiescent Current TJ = 25°C 3 mA

∆IdQuiescent Current Change IO = 5 mA to 1 A 0.5 mA

VI = -15 to -25 V 1

∆VO/∆T Output Voltage Drift IO = 5 mA -0.8 mV/°C

eN Output Noise Voltage B = 10Hz to 100KHz TJ = 25°C 200 µV

SVR Supply Voltage Rejection ∆VI = 10 V f = 120Hz 54 60 dB

VdDropout Voltage IO = 1 A TJ = 25°C ∆VO = 100

mV 1.1 V

Isc Short Circuit Current 1.5 A

Iscp Short Circuit Peak Current TJ = 25°C 2.5 A

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VOOutput Voltage TJ = 25°C -14.7 -15 -15.3 V

VOOutput Voltage IO = -5 mA to -1 A PO ≤ 15W

VI = -18.5 to -30 V -14.4 -15 -15.6 V

∆VO(*) Line Regulation VI = -17.5 to -30 V TJ = 25°C 300 mV

VI = -20 to -26 V TJ = 25°C 150

∆VO(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 300 mV

IO = 250 to 750 mA TJ = 25°C 150

IdQuiescent Current TJ = 25°C 3 mA

∆IdQuiescent Current Change IO = 5 mA to 1 A 0.5 mA

VI = -18.5 to -30 V 1

∆VO/∆T Output Voltage Drift IO = 5 mA -0.9 mV/°C

eN Output Noise Voltage B = 10Hz to 100KHz TJ = 25°C 250 µV

SVR Supply Voltage Rejection ∆VI = 10 V f = 120Hz 54 60 dB

VdDropout Voltage IO = 1 A TJ = 25°C ∆VO = 100

mV 1.1 V

Isc Short Circuit Current 1.3 A

Iscp Short Circuit Peak Current TJ = 25°C 2.3 A

L7900AC SERIES

6/13

Table 9: Electrical Characteristics Of L7918A (refer to the test circuits, TJ = 0 t o 125° C, VI = -2 7V,

IO = 500 mA, CI = 2.2 µ F , CO = 1 µF unless otherwise specified).

(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effect s must be taken int o acc ount

separately. Pulse testing with low duty cycle is used.

Table 10: electrical characteristics of L7920A (refer to the test circuits, TJ = 0 to 125°C, VI = -29V,

IO = 500 mA, CI = 2.2 µ F , CO = 1 µF unless otherwise specified).

(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effect s must be taken int o acc ount

separately. Pulse testing with low duty cycle is used.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VOOutput Voltage TJ = 25°C -17.64 -18 -18.36 V

VOOutput Voltage IO = -5 mA to -1 A PO ≤ 15W

VI = -22 to -33 V -17.3 -18 -18.7 V

∆VO(*) Line Regulation VI = -21 to -33 V TJ = 25°C 360 mV

VI = -24 to -30 V TJ = 25°C 180

∆VO(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 360 mV

IO = 250 to 750 mA TJ = 25°C 180

IdQuiescent Current TJ = 25°C 3 mA

∆IdQuiescent Current Change IO = 5 mA to 1 A 0.5 mA

VI = -22 to -33 V 1

∆VO/∆T Output Voltage Drift IO = 5 mA -1 mV/°C

eN Output Noise Voltage B = 10Hz to 100KHz TJ = 25°C 300 µV

SVR Supply Voltage Rejection ∆VI = 10 V f = 120Hz 54 60 dB

VdDropout Voltage IO = 1 A TJ = 25°C ∆VO = 100

mV 1.1 V

Isc Short Circuit Current 1.1 A

Iscp Short Circuit Peak Current TJ = 25°C 2.2 A

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VOOutput Voltage TJ = 25°C -19.6 -20 -20.4 V

VOOutput Voltage IO = -5 mA to -1 A PO ≤ 15W

VI = -24 to -35 V -19.2 -20 -20.8 V

∆VO(*) Line Regulation VI = -23 to -35 V TJ = 25°C 400 mV

VI = -26 to -32 V TJ = 25°C 200

∆VO(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 400 mV

IO = 250 to 750 mA TJ = 25°C 200

IdQuiescent Current TJ = 25°C 3 mA

∆IdQuiescent Current Change IO = 5 mA to 1 A 0.5 mA

VI = -24 to -35 V 1

∆VO/∆T Output Voltage Drift IO = 5 mA -1.1 mV/°C

eN Output Noise Voltage B = 10Hz to 100KHz TJ = 25°C 350 µV

SVR Supply Voltage Rejection ∆VI = 10 V f = 120Hz 54 60 dB

VdDropout Voltage IO = 1 A TJ = 25°C ∆VO = 100

mV 1.1 V

Isc Short Circuit Current 0.9 A

Iscp Short Circuit Peak Current TJ = 25°C 2.2 A

L7900AC SERIE S

7/13

Table 11: Electrical Characteristics Of L792 4A (refer to the test circuits, TJ = 0 to 125°C, V I = -33V ,

IO = 500 mA, CI = 2.2 µ F , CO = 1 µF unless otherwise specified).

(*) Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effect s must be taken int o acc ount

separately. Pulse testing with low duty cycle is used.

APPLICATIONS INFORMATION

Fi gure 3: F i xed Output Regu l ator

NOTE:

1. To s pecify a n out put volt age, sub st i tute voltage value for "X X " .

2. Required for sta bility. For v alue give n, capacitor must b e solid tantalum. If alu minium ele ctrolytics ar e used, at least ten ti mes va lue shoul d

be selecte d. C1 is required i f regula to r i s lo cated an appreciable distance from power supply filter.

3. To im prove t ransient response. If large capaci to rs a re used, a hig h current di ode from input to ou tput (1N4001 or similar ) should be intro-

duced to pr otect the device from mom ent ary input short circuit.

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VOOutput Voltage TJ = 25°C -23.5 -24 -24.5 V

VOOutput Voltage IO = -5 mA to -1 A PO ≤ 15W

VI = -27 to -38 V -23 -24 -25 V

∆VO(*) Line Regulation VI = -27 to -38 V TJ = 25°C 480 mV

VI = -30 to -36 V TJ = 25°C 240

∆VO(*) Load Regulation IO = 5 mA to 1.5 A TJ = 25°C 480 mV

IO = 250 to 750 mA TJ = 25°C 240

IdQuiescent Current TJ = 25°C 3 mA

∆IdQuiescent Current Change IO = 5 mA to 1 A 0.5 mA

VI = -27 to -38 V 1

∆VO/∆T Output Voltage Drift IO = 5 mA -1 mV/°C

eN Output Noise Voltage B = 10Hz to 100KHz TJ = 25°C 400 µV

SVR Supply Voltage Rejection ∆VI = 10 V f = 120Hz 54 60 dB

VdDropout Voltage IO = 1 A TJ = 25°C ∆VO = 100

mV 1.1 V

Isc Short Circuit Current 1.1 A

Iscp Short Circuit Peak Current TJ = 25°C 2.2 A

L7900AC SERIES

8/13

Figure 4 : Sp lit P ow e r Supp ly (± 1 5 V/1 A)

Against potential l atch-u p proble m s.

Figure 5: Circuit for Increasing Output Voltage

C3 Optional for impr oved tra nsient res ponse and rippl e rej ection.

Figure 6: High Current Negative Regulator (-5V/4A with 5A current limiting)

R1 + R2

VO = V xx 

Vxx

 > 3Id

L7900AC SERIE S

9/13

DIM. mm. inch

MIN. TYP MAX. MIN. TYP. MAX.

A 4.40 4.60 0.173 0.181

C 1.23 1.32 0.048 0.051

D 2.40 2.72 0.094 0.107

D1 1.27 0.050

E 0.49 0.70 0.019 0.027

F 0.61 0.88 0.024 0.034

F1 1.14 1.70 0.044 0.067

F2 1.14 1.70 0.044 0.067

G 4.95 5.15 0.194 0.203

G1 2.4 2.7 0.094 0.106

H2 10.0 10.40 0.393 0.409

L2 16.4 0.645

L4 13.0 14.0 0.511 0.551

L5 2.65 2.95 0.104 0.116

L6 15.25 15.75 0.600 0.620

L7 6.2 6.6 0.244 0.260

L9 3.5 3.93 0.137 0.154

DIA. 3.75 3.85 0.147 0.151

TO-220 ME CHANICAL DATA

P011C

L7900AC SERIES

10/13

DIM. mm. inch

MIN. TYP MAX. MIN. TYP. MAX.

A 4.4 4.6 0.173 0.181

A1 2.49 2.69 0.098 0.106

A2 0.03 0.23 0.001 0.009

B 0.7 0.93 0.027 0.036

B2 1.14 1.7 0.044 0.067

C 0.45 0.6 0.017 0.023

C2 1.23 1.36 0.048 0.053

D 8.95 9.35 0.352 0.368

D1 8 0.315

E 10 10.4 0.393 0.409

E1 8.5 0.335

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

M 2.4 3.2 0.094 0.126

R 0.4 0.016

V2 0˚ 8˚ 0˚ 8˚

D2PAK MECHANICAL DATA

P011P6G

L7900AC SERIE S

11/13

DIM. mm. inch

MIN. TYP MAX. MIN. TYP. MAX.

A 180 7.086

C 12.8 13.0 13.2 0.504 0.512 0.519

D 20.2 0.795

N 60 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 4.80 4.90 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

Tape & Reel D2PAK-P2PAK-D2PAK/A-P2PAK/A MECHANICAL DATA

L7900AC SERIES

12/13

Table 12: Revision History

Date Revisio n Descrip tion of Change s

22-Jun-2004 7 Ordering Codes updated Table 3, pag. 2.

L7900AC SERIE S

13/13

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the

conseq uences of use o f suc h info rmat ion n or for any in fringeme nt of paten ts or oth er righ ts of third part ies whic h may resul t from

its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications

mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information

previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or

systems without express written approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelectronics

All other names are the property of their respective owners

STMicroelectronics GROUP OF COMPANIES

Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -

Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.

http://www.st.com