STMicroelectronics LD1585Cxx Technical data

5 A low dropout fast response positive voltage regulator

Features

■ Typical dropout 1.2 V

■ Fast transient response

■ Three terminal adjustable or fixed output

voltage 1.5 V, 2.5 V, 2.85 V, 5 V, 8 V, 9 V

■ Guaranteed output current up to 5 A

■ Output tolerance ±1% at 25 °C and ±2 % in full

temperature range

■ Internal power and thermal limit

■ Wide operating temperature range

0 °C to 125 °C

■ Package available: TO-220, D

■ Pinout compatibility with standard adjustable

VREG

Description

The LD1585C is a LOW DROP voltage regulator
able to provide up to 5 A of output current.
Dropout is guaranteed at a maximum of 1.4 V at
the maximum output current, decreasing at lower
loads. The device has been improved to be
utilized in low voltage applications where transient
response and minimum input voltage are critical.

2

PAK/A

LD1585Cxx

adjustable and fixed

TO-220

The most important feature of the device consist
in lower dropout voltage and very fast transient
response. A 2.85 V output version is suitable for
SCSI-2 active termination. Unlike PNP regulators,
where a part of the output current is wasted as
quiescent current, the LD1585C quiescent current
flows into the load, so increase efficiency. Only a
10 µF minimum capacitor is need for stability.

The device is supplied in TO-220, D

2

D

PAK/A. On chip trimming allows the regulator to
reach a very tight output voltage tolerance, within
±1% at 25 °C.

D2PAK/A

2

PAK and

Table 1. Device summary

Order codes

Part number

TO-220 D

LD1585CXX15 LD1585CD2M15R 1.5 V

LD1585CXX25 LD1585CD2M25R 2.5 V

LD1585CXX28 LD1585CD2M28R 2.85 V

LD1585CXX50 LD1585CV50 LD1585CD2M50R 5.0 V

LD1585CXX80 LD1585CD2M80R 8.0 V

LD1585CXX90 LD1585CD2M90R 9.0 V

LD1585CXX LD1585CV ADJ

November 2007 Rev 6 1/23

2

PAK/A (T&R) Output voltage

www.st.com

23

Contents LD1585Cxx

Contents

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

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

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

4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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

6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2/23

LD1585Cxx Diagram

1 Diagram

Figure 1. Schematic diagram

3/23

Pin configuration LD1585Cxx

2 Pin configuration

Figure 2. Pin connections (top view)

TO-220

D2PAK/A

4/23

LD1585Cxx Maximum ratings

3 Maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

T

P

T

V

I

I

O

D

STG

OP

DC input voltage 30 V

Output current Internally Limited mA

Power dissipation Internally Limited mW

Storage temperature range -55 to +150 °C

Operating junction temperature range 0 to +125 °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 TO-220 D2PAK/A Unit

R

R

thJC

thJA

Thermal resistance junction-case 3 3 °C/W

Thermal resistance junction-ambient 50 62.5 °C/W

5/23

Typical application LD1585Cxx

4 Typical application

Figure 3. Application circuits

VO = V

(1+R2/R1)

REF

6/23

LD1585Cxx Electrical characteristics

5 Electrical characteristics

Table 4. Electrical characteristics of LD1585C#15 (VI = 4.5 V, CI = CO =10 µF, TJ = 0 to 125 °C,

unless otherwise specified.)

Symbol Parameter Test conditions Min. Typ. Max. Unit

I

= 0 mA, TJ = 25°C 1.485 1.5 1.515 V

V

Output voltage

O

ΔV

ΔV

Line regulation

O

Load regulation

O

V

Dropout voltage IO = 5 A 1.2 1.4 V

d

Quiescent current VI ≤ 25V 5 10 mA

I

q

Short circuit current VI - VO = 5V 5.5 7 A

I

sc

Thermal regulation T

SVR Supply voltage rejection

O

I

= 0 to 5A, VI = 3 to 25V

O

I

= 0 mA, VI = 3 to 15V TJ = 25°C 0.005 0.2 %

O

I

= 0 mA, VI = 3 to 15V 0.005 0.2 %

O

I

= 0 to 5A, TJ = 25°C 0.05 0.3 %

O

= 0 to 5A 0.05 0.5 %

I

O

= 25°C, 30ms pulse 0.004 0.02 %/W

J

f = 120 Hz, C

= 25µF, IO = 5A

O

VI - VO = 3 ± 1V

(1)

1.47 1.5 1.53 V

60 75 dB

RMS output noise voltage

eN

(% of V

)

O

= 25°C, f =10Hz to 10kHz 0.003 %

T

J

S Temperature stability 0.5 %

S Long term stability T

1. See short-circuit current curve for available output current at fixed dropout.

= 125°C, 1000Hrs 0.03 1 %

J

7/23

Electrical characteristics LD1585Cxx

Table 5. Electrical characteristics of LD1585C#25 (VI = 5.5 V, CI = CO =10 µF, TJ = 0 to 125 °C,

unless otherwise specified.)

Symbol Parameter Test conditions Min. Typ. Max. Unit

I

= 0 mA, TJ = 25°C 2.475 2.5 2.525 V

V

Output voltage

O

ΔV

ΔV

Line regulation

O

Load regulation

O

V

Dropout voltage IO = 5 A 1.2 1.4 V

d

Quiescent current VI ≤ 25V 5 10 mA

I

q

Short circuit current VI - VO = 5.5V 5.5 7 A

I

sc

Thermal regulation T

SVR Supply voltage rejection

O

I

= 0 to 5A, VI = 4 to 25V

O

I

= 0 mA, VI = 4 to 15V, TJ = 25°C 0.005 0.2

O

= 0 mA, VI = 4 to 15V 0.005 0.2

I

O

I

= 0 to 5A, TJ = 25°C 0.05 0.3

O

= 0 to 5A 0.05 0.5

I

O

= 25°C, 30ms pulse 0.004 0.02 %/W

J

f = 120 Hz, C

= 25µF, IO = 5A

O

VI - VO = 3 ± 1V

(1)

2.45 2.5 2.55 V

60 75 dB

mV

mV

RMS output noise voltage

eN

(% of V

)

O

= 25°C, f =10Hz to 10kHz 0.003 %

T

J

S Temperature stability 0.5 %

S Long term stability T

1. See short-circuit current curve for available output current at fixed dropout.

= 125°C, 1000Hrs 0.03 1 %

J

8/23

LD1585Cxx Electrical characteristics

Table 6. Electrical characteristics of LD1585C#285 (VI = 5.85 V, CI = CO =10 µF, TJ = 0 to 125 °C,

unless otherwise specified.)

Symbol Parameter Test conditions Min. Typ. Max. Unit

I

= 0 mA, TJ = 25°C 2.821 2.85 2.879 V

V

Output voltage

O

ΔV

ΔV

Line regulation

O

Load regulation

O

V

Dropout voltage IO = 5 A 1.2 1.4 V

d

Quiescent current VI ≤ 25V 5 10 mA

I

q

Short circuit current VI - VO = 5.5V 5.5 7 A

I

sc

Thermal regulation T

SVR Supply voltage rejection

O

I

= 0 to 5A, VI = 4.5 to 25V

O

I

= 0 mA, VI = 4.5 to 15V, TJ = 25°C 0.005 0.2

O

= 0 mA, VI = 4.5 to 15V 0.005 0.2

I

O

I

= 0 to 5A, TJ = 25°C 0.05 0.3

O

= 0 to 5A 0.05 0.5

I

O

= 25°C, 30ms pulse 0.004 0.02 %/W

J

f = 120 Hz, C

= 25µF, IO = 5A

O

VI - VO = 3 ± 1V

(1)

2.793 2.85 2.907 V

60 75 dB

mV

mV

RMS output noise voltage

eN

(% of V

)

O

= 25°C, f =10Hz to 10kHz 0.003 %

T

J

S Temperature stability 0.5 %

S Long term stability T

1. See short-circuit current curve for available output current at fixed dropout.

= 125°C, 1000Hrs 0.03 1 %

J

9/23

Electrical characteristics LD1585Cxx

Table 7. Electrical characteristics of LD1585C#50 (VI = 8 V, CI = CO =10 µF, TJ = 0 to 125 °C,

unless otherwise specified.)

Symbol Parameter Test conditions Min. Typ. Max. Unit

I

= 0 mA, TJ = 25°C 4.95 5 5.05 V

V

Output voltage

O

ΔV

ΔV

Line regulation

O

Load regulation

O

V

Dropout voltage IO = 5 A 1.2 1.4 V

d

Quiescent current VI ≤ 25V 5 10 mA

I

q

Short circuit current VI - VO = 5.5V 5.5 7 A

I

sc

Thermal regulation T

SVR Supply voltage rejection

O

I

= 0 to 5A, VI = 6.5 to 30V

O

I

= 0 mA, VI = 6.5 to 20V, TJ = 25°C 0.005 0.2

O

= 0 mA, VI = 6.5 to 20V 0.005 0.2

I

O

I

= 0 to 5A, TJ = 25°C 0.05 0.3

O

= 0 to 5A 0.05 0.5

I

O

= 25°C, 30ms pulse 0.004 0.02 %/W

J

f = 120 Hz, C

= 25µF, IO = 5A

O

VI - VO = 3 ± 1V

(1)

4.9 5 5.1 V

60 75 dB

mV

mV

RMS output noise voltage

eN

(% of V

)

O

= 25°C, f =10Hz to 10kHz 0.003 %

T

J

S Temperature stability 0.5 %

S Long term stability T

1. See short-circuit current curve for available output current at fixed dropout.

= 125°C, 1000Hrs 0.03 1 %

J

10/23

LD1585Cxx Electrical characteristics

Table 8. Electrical characteristics of LD1585C#80 (VI = 11 V, CI = CO =10 µF, TJ = 0 to 125 °C,

unless otherwise specified.)

Symbol Parameter Test conditions Min. Typ. Max. Unit

I

= 0 mA, TJ = 25°C 7.92 8 8.08 V

V

Output voltage

O

ΔV

ΔV

Line regulation

O

Load regulation

O

V

Dropout voltage IO = 5 A 1.2 1.4 V

d

Quiescent current VI ≤ 25V 5 10 mA

I

q

Short circuit current VI - VO = 5.5V 5.5 7 A

I

sc

Thermal regulation T

SVR Supply voltage rejection

O

I

= 0 to 5A, VI = 9.5 to 30V

O

I

= 0 mA, VI = 9.5 to 20V, TJ = 25°C 0.005 0.2

O

= 0 mA, VI = 9.5 to 20V 0.005 0.2

I

O

I

= 0 to 5A, TJ = 25°C 0.05 0.3

O

= 0 to 5A 0.05 0.5

I

O

= 25°C, 30ms pulse 0.004 0.02 %/W

J

f = 120 Hz, C

= 25µF, IO = 5A

O

VI - VO = 3 ± 1V

(1)

7.84 8 8.16 V

60 75 dB

mV

mV

RMS output noise voltage

eN

(% of V

)

O

= 25°C, f =10Hz to 10kHz 0.003 %

T

J

S Temperature stability 0.5 %

S Long term stability T

1. See short-circuit current curve for available output current at fixed dropout.

= 125°C, 1000Hrs 0.03 1 %

J

11/23

Electrical characteristics LD1585Cxx

Table 9. Electrical characteristics of LD1585C#90 (VI = 12 V, CI = CO =10 µF, TJ = 0 to 125 °C,

unless otherwise specified.)

Symbol Parameter Test conditions Min. Typ. Max. Unit

I

= 0 mA, TJ = 25°C 8.91 9 9.09 V

V

Output voltage

O

ΔV

ΔV

Line regulation

O

Load regulation

O

V

Dropout voltage IO = 5 A 1.2 1.4 V

d

Quiescent current VI ≤ 25V 5 10 mA

I

q

Short circuit current VI - VO = 5.5V 5.5 7 A

I

sc

Thermal regulation T

SVR Supply voltage rejection

O

I

= 0 to 5A, VI = 10.5 to 30V

O

I

= 0 mA, VI = 10.5 to 20V, TJ = 25°C 0.005 0.2

O

= 0 mA, VI = 10.5 to 20V 0.005 0.2

I

O

I

= 0 to 5A, TJ = 25°C 0.05 0.3

O

= 0 to 5A 0.05 0.5

I

O

= 25°C, 30ms pulse 0.004 0.02 %/W

J

f = 120 Hz, C

= 25µF, IO = 5A

O

VI - VO = 3 ± 1V

(1)

8.82 9 9.18 V

60 75 dB

mV

mV

RMS output noise voltage

eN

(% of V

)

O

= 25°C, f =10Hz to 10kHz 0.003 %

T

J

S Temperature stability 0.5 %

S Long term stability T

1. See short-circuit current curve for available output current at fixed dropout.

= 125°C, 1000Hrs 0.03 1 %

J

12/23

LD1585Cxx Electrical characteristics

Table 10. Electrical characteristics of LD1585C# (VI = 4.25 V, CI = CO =10 µF, TJ = 0 to 125 °C,

unless otherwise specified.)

Symbol Parameter Test conditions Min. Typ. Max. Unit

I

= 10mA, VI - VO = 3V, TJ = 25°C 1.237 1.25 1.263 V

V

Output voltage

O

ΔV

ΔV

I

O(min)

Line regulation

O

Load regulation

O

V

Dropout voltage IO = 5A 1.2 1.4 V

d

Minimum load current VI = 25V 3 10 mA

Short circuit current VI - VO = 5.5V 5.5 7 A

I

sc

Thermal regulation T

SVR Supply voltage rejection

O

I

= 10mA to 5A, VI - VO =1.5 to 25V

O

I

= 10mA, VI = 2.75 to 15V TJ = 25°C 0.015 0.2 %

O

= 10mA, VI = 2.75 to 15V 0.1 0.2 %

I

O

(1)

1.225 1.25 1.275 V

IO = 10mA to 5A, TJ = 25°C 0.1 0.3 %

= 0 to 5A 0.25 0.5 %

I

O

= 25°C, 30ms pulse 0.004 0.02 %/W

J

f = 120 Hz, C

= 25µF, C

O

IO = 5A, VI - VO = 3 ± 1V

ADJ

= 25µF,

60 75 dB

I

ΔI

Adjust pin current IO = 10 mA 50 100 µA

ADJ

Adjust pin current change IO = 10mA to 5A, VI = 3 to 25V

ADJ

RMS output noise voltage

eN

(% of V

)

O

= 25°C, f =10Hz to 10kHz 0.003 %

T

J

(1)

0.2 5 µA

S Temperature stability 0.5 %

S Long term stability T

1. See short-circuit current curve for available output current at fixed dropout.

= 125°C, 1000Hrs 0.5 %

J

13/23

Typical characteristics LD1585Cxx

6 Typical characteristics

(unless otherwise specified TJ = 25 °C, CI = CO = 10 µF tant.)

Figure 4. Output voltage vs temperature Figure 5. Short circuit current vs dropout

Figure 6. Line regulation vs temperature Figure 7. Line regulation vs temperature

voltage

Figure 8. Load regulation vs temperature Figure 9. Load regulation vs temperature

14/23

LD1585Cxx Typical characteristics

Figure 10. Dropout voltage vs temperature Figure 11. Dropout voltage vs output current

Figure 12. Adjust pin current vs input voltage Figure 13. Adjust pin current vs temperature

Figure 14. Adjust pin current change vs

temperature

Figure 15. Quiescent current vs temperature

15/23

Typical characteristics LD1585Cxx

Figure 16. Reference voltage vs temperature Figure 17. Minimum load current vs

temperature

Figure 18. Supply voltage rejection vs output

current

Figure 20. Supply voltage rejection vs

frequency

Figure 19. Supply voltage rejection vs output

current

Figure 21. Supply voltage rejection vs

frequency

16/23

LD1585Cxx Typical characteristics

Figure 22. Supply voltage rejection vs

Figure 24. Line transient Figure 25. Load transient

temperature

Figure 23. Supply voltage rejection vs

temperature

VI=15 to 16V, IO=200mA, CI = 1µF(tant), CO=10µF(tant)

Figure 26. Load transient

VI=7 V, IO=0.1 to 5 A, CI = 10µF(tant), CO=10µF(tant)

VI=15 V, IO=0.1 to 5 A, CI = 10µF(tant), CO=10µF(tant)

17/23

Package mechanical data LD1585Cxx

7 Package mechanical data

In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.

18/23

LD1585Cxx Package mechanical data

D2PAK/A mechanical data

mm. inch.

Dim.

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

A 4.40 4.60 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 0.028 0.037

B1 0.8 1.3 0.031 0.051

B2 1.14 1.7 0.045 0.067

C 0.45 0.60 0.018 0.024

C2 1.23 1.36 0.048 0.054

D 8.95 9.350.352 0.368

D1 8 0.315

E 10 10.4 0.394 0.409

E1 8.5 0.335

G4.88 5.28 0.192 0.208

L 15 15.85 0.591 0.624

L2 1.27 1.4 0.050 0.055

M2.4 3.2 0.094 0.126

R 0.4 0.016

V2 0° 8°0° 8°

7106164/D

19/23

Package mechanical data LD1585Cxx

TO-220 mechanical data

Dim.

A 4.40 4.60 0.173 0.181

C1.23 1.32 0.048 0.051

D 2.40 2.72 0.094 0.107

D1 1.27 0.050

E0.49 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

G4.95 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

L93.5 3.93 0.137 0.154

DIA. 3.75 3.85 0.147 0.151

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

mm. inch.

20/23

P011C

LD1585Cxx Package mechanical data

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.

21/23

Revision history LD1585Cxx

8 Revision history

Table 11. Document revision history

Date Revision Changes

07-Oct-2004 3 Mistake order codes - Table 1.

20-Oct-2005 4 Order codes has been updated.

08-Jun-2007 5 Order codes updated.

29-Nov-2007 6 Added Ta bl e 1 .

22/23

LD1585Cxx

Please Read Carefully:

Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.

All ST products are sold pursuant to ST’s terms and conditions of sale.

Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.

UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.

UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.

Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.

ST and the ST logo are trademarks or registered trademarks of ST in various countries.

Information in this document supersedes and replaces all information previously supplied.

The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.

© 2007 STMicroelectronics - All rights reserved

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 of America

www.st.com

23/23