ST LD1580 User Manual

LD1580

LD1580

7 A VERY LOW DROP POSITIVE VOLTAGE REGULATOR ADJUSTABLE AND FIXED

PRELIMINARY DATA

■OUTPUT CURRENT LIMIT

■LOW DROPOUT VOLTAGE: TYPICALLY 400mV AT 7A OUTPUT CURRENT

■OUTPUT VOLTAGE REMOTE SENSE PIN

■FAST TRANSIENT RESPONSE

■THERMAL SHUTDOWN PROTECTION WITH HYSTERESIS

■WIDE OPERATING TEMPERATURE RANGE -40°C TO 125°C

■NO SUPPLY SEQUENCING PROBLEMS IN DUAL SUPPLY MODE

■OUTPUT VOLTAGES AVAILABLE 1.5 V, 1.8V, 2.5 V, 3.0 V, 3.3 V ADJUSTABLE.

DESCRIPTION

The LD1580 is a very low dropout positive linear voltage regulator particularly suitable in applications requiring output currents up to 7 A.

The LD1580 typical dropout voltage is 400mV				at
7A	while	it	decreases	at
lighter loads.

This very low dropout is achieved thanks to a

second input voltage pin, named VCONTROL, which is also responsable of the output power

stage driving.

The LD1580 is provided with an output voltage remote sense pin which reduces dramatically any

HEPTAWATTTM PENTAWATTTM

5

1

P2PAK

SPAK-5L

SPAK-7L

output voltage variations that could occur due to load changes.

On fixed voltage devices, the ADJ pin is still available. A small capacitor on this pin helps to improve transient response.

SCHEMATIC DIAGRAM

November 2002

1/18

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

LD1580

The LD1580 also features a built-in output current limit function and a thermal shutdown protection with hysteresis which prevents from excessive power dissipation in case of insufficient

ABSOLUTE MAXIMUM RATINGS

heatsinking. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ±2% at the maximum output current and over the full temperature range.

Symbol	Parameter	Value	Unit
VPOWER	DC VPOWER voltage	from -0.3 to 6	V
VCONTROL	DC VCONTROL voltage	from -0.3 to 13	V
IOUT	Output Current	Internally Limited	A
PD	Power Dissipation	Internally Limited	W
Tstg	Storage Temperature Range	-55 to +150	°C
Top	Operating Junction Temperature Range	-40 to +125	°C

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

THERMAL DATA

	Symbol	Parameter	PENTAWATTTM	P2PAK	SPAK-5L	Unit
			HEPTAWATTTM		SPAK-7L
	Rthj-case	Thermal Resistance Junction-case	3	3	2	°C/W
	Rthj-amb	Thermal Resistance Junction-ambient	50	62.5	TBD	°C/W

CONNECTION DIAGRAM (top view)

HEPTAWATTTM		PENTAWATTTM
P2PAK	SPAK-5L	SPAK-7L
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					LD1580
ORDERING CODES
P2PAK (*)	PENTAWATT	SPAK-5L (*)	SPAK-7L (*)	HEPTAWATT	OUTPUT VOLTAGE
			LD1580K7-15	LD1580V7V15	1.5V
			LD1580K7-18	LD1580V7V18	1.8V
			LD1580K7-25	LD1580V7V25	2.5V
			LD1580K7-30	LD1580V7V30	3.0V
			LD1580K7-33	LD1580V7V33	3.3V
LD1580P2T	LD1580V5V	LD1580K5			Adjustable

(*) Available in Tape & Reel with the suffix "R" for fixed version and "-R" for adjustable version.

TYPICAL APPLICATION CIRCUITS FOR FIXED VERSION

TYPICAL APPLICATION CIRCUITS FOR ADJUSTABLE VERSION

R

VO = VREF (1 + ¾¾2 )

R1

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LD1580

ELECTRICAL CHARACTERISTICS FOR LD1580xx15 ( Tj = -40 °C to 125 °C, C P=330 µF, CC=10 µF, COUT=100 µF, unless otherwise specified)

Symbol	Parameter	Test Conditions		Min.	Typ.	Max.	Unit
VO	Output Voltage	VCONTROL=4 V, VPOWER=2.3 V		1.485	1.5	1.515	V
		Tj=25 °C, I OUT=0 mA
		VCONTROL=3 V to 12 V		1.470	1.5	1.530
		VPOWER=2.1 V to 5.5 V
		IOUT=0 to 7 A
VO	Line Regulation	VCONTROL=2.65 V to 12 V			0.08	0.24	%
		VPOWER=2 V to 5.5 V
		IOUT=10 mA
VO	Load Regulation	VCONTROL=4 V, VPOWER=2.3 V			0.08	0.4	%
		IOUT=0 to 7 A
IC	VCONTROL Pin Current	VCONTROL=4 V, VPOWER=2.3 V			6	10	mA
		IOUT=100 mA
		VCONTROL=4 V, VPOWER=2.3 V			30	60
		IOUT=4 A
		VCONTROL=4 V, VPOWER=2 V			33	70
		IOUT=4 A
		VCONTROL=4 V, VPOWER=2.3 V			60	120
		IOUT=7 A
IQ	Quiescent Current	VCONTROL=4 V, VPOWER=2.3 V			5	10	mA
		IOUT=0 A
IOUT	Output Current Limit	VCONTROL=4 V, VPOWER=2.3 V	(Note	8	9		A
		1)
SVR	Supply Voltage Rejection	VCONTROL=VPOWER=4 V Avg,		60	80		dB
		VRIPPLE=1 VP-P
		IOUT=4 A, Tj=25 °C
VDC	Minimun VCONTROL Voltage	VPOWER=2.3 V, IOUT=100 mA	(Note 2)		0.95	1.15	V
	(VCONTROL-VO)
		VPOWER=2.3 V, IOUT=1 A			0.95	1.15
		VPOWER=2.3 V, IOUT=4 A			1	1.2
		VPOWER=2.3 V, IOUT=7 A			1.05	1.3
VDP	Minimun VPOWER Voltage	VCONTROL=4 V, IOUT=1 A	(Note 2)		0.05	0.15	V
	(VPOWER-VO)
		VCONTROL=4 V, IOUT=4 A			0.2	0.4
		VCONTROL=4 V, IOUT=7 A			0.4	0.6
TSHDN	Shutdown Temperature				170		°C
	Threshold
THYST	Thermal Shutdown				5		°C
	Hysteresis

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LD1580

ELECTRICAL CHARACTERISTICS FOR LD1580xx18 ( Tj = -40 °C to 125 °C, C P=330 µF, CC=10 µF, COUT=100 µF, unless otherwise specified)

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VO

Output Voltage

VCONTROL=4 V, VPOWER=2.6 V

1.782

1.8

1.818

V

Tj=25 °C, I OUT=0 mA

VCONTROL=3.3 V to 12 V

1.764

1.8

1.836

VPOWER=2.4 V to 5.5 V

IOUT=0 to 7 A

VO

Line Regulation

VCONTROL=2.95 V to 12 V

0.08

0.24

%

VPOWER=2.3 V to 5.5 V

IOUT=10 mA

VO

Load Regulation

VCONTROL=4.3 V, VPOWER=2.6 V

0.08

0.4

%

IOUT=0

to 7 A

IC

VCONTROL Pin Current

VCONTROL=4.3 V, VPOWER=2.6 V

6

10

mA

IOUT=100 mA

VCONTROL=4.3 V, VPOWER=2.6 V

30

60

IOUT=4 A

VCONTROL=4.3 V, VPOWER=2.3 V

33

70

IOUT=4 A

VCONTROL=4.3 V, VPOWER=2.6 V

60

120

IOUT=7 A

IQ

Quiescent Current

VCONTROL=4.3 V, VPOWER=2.6 V

5

10

mA

IOUT=0 A

IOUT

Output Current Limit

VCONTROL=4.3 V, VPOWER=2.6 V

(Note

8

9

A

1)

SVR

Supply Voltage Rejection

VCONTROL=VPOWER=4.3 V Avg,

58.4

78.4

dB

VRIPPLE=1 VP-P

IOUT=4 A, Tj=25 °C

VDC

Minimun VCONTROL Voltage

VPOWER=2.6 V, IOUT=100 mA

(Note 2)

0.95

1.15

V

(VCONTROL-VO)

V

POWER

=2.6 V, I

OUT

=1 A

0.95

1.15

VPOWER=2.6 V, IOUT=4 A

1

1.2

VPOWER=2.6 V, IOUT=7 A

1.05

1.3

VDP

Minimun VPOWER Voltage

VCONTROL=4.3 V, IOUT=1 A

(Note 2)

0.05

0.15

V

(VPOWER-VO)

V

=4.3 V, I

=4 A

0.2

0.4

CONTROL

OUT

VCONTROL=4.3 V, IOUT=7 A

0.4

0.6

TSHDN

Shutdown Temperature

170

°C

Threshold

THYST

Thermal Shutdown

5

°C

Hysteresis

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LD1580

ELECTRICAL CHARACTERISTICS FOR LD1580xx25 (Tj = -40 °C to 125 °C, C P=330 µF, CC=10 µF, COUT=100 µF, unless otherwise specified)

Symbol	Parameter			Test Conditions				Min.	Typ.	Max.	Unit
VO	Output Voltage	VCONTROL=5 V, VPOWER=3.3 V						2.475	2.5	2.525	V
		Tj=25 °C, I OUT=0 mA
		VCONTROL=4 V to 12 V						2.450	2.5	2.550
		VPOWER=3.1 V to 5.5 V
		IOUT=0 to 7 A
VO	Line Regulation	VCONTROL=3.65 V to 12 V							0.08	0.24	%
		VPOWER=3 V to 5.5 V
		IOUT=10 mA
VO	Load Regulation	VCONTROL=5 V, VPOWER=3.3 V							0.08	0.4	%
		IOUT=0 to 7 A
IC	VCONTROL Pin Current	VCONTROL=5 V, VPOWER=3.3 V							6	10	mA
		IOUT=100 mA
		VCONTROL=5 V, VPOWER=3.3 V							30	60
		IOUT=4 A
		VCONTROL=5 V, VPOWER=3 V							33	70
		IOUT=4 A
		VCONTROL=5 V, VPOWER=3.3 V							60	120
		IOUT=7 A
IQ	Quiescent Current	VCONTROL=5 V, VPOWER=3.3 V							5	10	mA
		IOUT=0 A
IOUT	Output Current Limit	VCONTROL=5 V, VPOWER=3.3 V						8	9		A
		(Note1)
SVR	Supply Voltage Rejection	VCONTROL=VPOWER=5 V Avg,						55.5	75.5		dB
		VRIPPLE=1 VP-P
		IOUT=4 A, Tj=25 °C
VDC	Minimun VCONTROL Voltage	VPOWER=3.3 V, IOUT=100 mA					(Note 2)		0.95	1.15	V
	(VCONTROL-VO)
		V	POWER	=3.3 V, I		=1 A			0.95	1.15
				OUT
		VPOWER=3.3 V, IOUT=4 A							1	1.2
		VPOWER=3.3 V, IOUT=7 A							1.05	1.3
VDP	Minimun VPOWER Voltage	VCONTROL=5 V, IOUT=1 A					(Note 2)		0.05	0.15	V
	(VPOWER-VO)
		V		=5 V, I	OUT	=4 A			0.2	0.4
			CONTROL
		VCONTROL=5 V, IOUT=7 A							0.4	0.6
TSHDN	Shutdown Temperature								170		°C
	Threshold
THYST	Thermal Shutdown								5		°C
	Hysteresis

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