Texas Instruments PT6931N, PT6932A, PT6932C, PT6932N, PT6931A Datasheet

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P T 6 9 3 0 S e r i e s

SLTS062 - DECEMBER 1999

Application Notes

5V TO 3.3V/2.5V 25 WATT DUAL OUTPUT

INTEGRATED SWITCHING REGULATOR Mechanical Outline

Product Selector Guide

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Features

•Dual Outputs:

+3.3V/6A

+2.5V/2.2A or +1.8V/1.5A

•Adjustable Output Voltage

•Remote Sense (both outputs)

•Standby Function

•Over-Temperature Protection

•Soft-Start

•Internal Sequencing

•23-pin Excalibur™ Package

The PT6930 is a new series of 25W dual output ISRs designed to power the latest generation DSP chips. Both output voltages are independently adjustable with external resistors. In addition, the second output voltage of the PT6931 can be selected for either 2.5V or 1.8V to accommodate the next generation of DSP chips. The internal power sequencing of both outputs meet the requirements of TI’s ‘C6000 series DSPs.

Patent pending on package assembly							Pin-Out Information
							Pin	Function	Pin	Function
Standard Application							1	V1 Remote Sense	13	V1out
							2	Do Not Connect	14	V1out
C1 = Req’d 560µF electrolytic				(1)			3	STBY	15	V1out
C2 = Req’d 330µF electrolytic				(1)			4	Vin	16	V1 Adjust
C3 = Optional 100µF electrolytic						V2SENSE	5	Vin	17	Do Not Connect
STBY						V1SENSE	6	Vin	18	V2out
		3	22	1		V1 O U T	7	GND	19	V2out
				18-21			8	GND	20	V2out
VIN	4,5,6	PT6930
						V2 O U T	9	GND	21	V2out
				12-15
		7-11	16	23		+	10	GND	22	V2 Remote Sense
C1					+	C3
				C2			11	GND	23	V2 Adjust*
GND						GND	12	V1out
							*Note:	forPT6931only:

Ordering Information

PT6931 = +3.3 Volts

+2.5/+1.8 Volts

PT6932 = +3.3 Volts

+1.5 Volts

PT Series Suffix (PT1234X)

Case/Pin

Configuration

Vertical Through-Hole	N
Horizontal Through-Hole	A
Horizontal Surface Mount	C

(For dimensions and PC board layout, see Package Styles 1320 and 1330.)

withpin23open,V2out=2.5V

withpin23shortedtopin22,V2out=1.8V

Preliminary Specifications

Characteristics										PT6930 SERIES
(Ta= 25°C unless noted)	Symbols		Conditions						Min		Typ		Max		Units
Output Current	Io		Ta =	+60°C, 200 LFM, pkg N			V1 = 3.3V		0.1 (2)		—		5.5	(3)
							V2 = 2.5V		0		—		2.2	(3)	A
							V2 = 1.8V		0		—		1.75(3)
							V2 = 1.2V		0		—		1.2	(3)
			Ta =	+25°C, natural convection			V1 = 3.3V		0.1		—		6.0
							V2 = 2.5V		0		—		2.2		A
							V2 = 1.8V		0		—		1.75
							V2 = 1.2V		0		—		1.2
Input Voltage Range	Vin		0.1A ≤		Io ≤ Imax				4.5		—		5.5		V
Output Voltage Tolerance	∆ Vo		Vin = +5V, Io = Imax, both outputs						Vo-0.1		—		Vo+0.1		V
			0°C ≤		Ta ≤ +65°C
Line Regulation	Regline		4.5V ≤		Vin ≤	5.5V, Io = Imax	V1 = 3.3V		—		±7		±17		mV
							V2 = 2.5V		—		±7		±13
Load Regulation	Regload		Vin = +5V, 0.1 ≤ Io ≤ Imax				V1 = 3.3V		—		±17		±33		mV
							V2 = 2.5V		—		±4		±10
Vo Ripple/Noise	Vn		Vin = +5V, Io = Imax				V1 = 3.3V		—		50		—		mV
							V2 = 2.5V		—		25		—
Transient Response	ttr		Io step between 0.5xImax and Imax				V1 = 3.3V		—		25		—		µSec
with C2 = 330µF	Vos		Vo over/undershoot						—		60		—		mV
							V2 = 2.5V		—		60		—
Efficiency	η		Vin = +5V, Io = 4A total						—		75		—		%
Switching Frequency	ƒo		4.5V ≤		Vin ≤	5.5V			475		600		725		kHz
			0.1A ≤		Io ≤	Imax
Absolute Maximum	Ta		—						-40 (4)		—		+85 (5)		°C
Operating Temperature Range
Storage Temperature	Ts		—						-40		—		+125		°C
Weight	—		Vertical/Horizontal						—		29		—		grams

Notes: (1) The PT6930 series requires a 560µF electrolytic capacitor on the input and a 330µF electrolytic capacitor on the output for proper operation in all applications.

(2)Iomin current of 0.25A can be divided btween both outputs; V1, or V2. The ISR will operate down to no-load with reduced specifications.

(3)Iomax listed for each output assumes the maximum current drawn simultaneously on both outputs. Consult the factory for the absolute maximum.

(4)For operating temperatures below 0°C, use tantalum type capacitors on both the input and output.

(5)See Safe Operating Area curves for appropriate derating.

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com

For assistance or to order, call [phone]

P T 6 9 3 0 S e r i e s

C H A R A C T E R I S T I C D A T A

PT6931, V2out = 2.5V, I2out = 2.2A (See Foot Note)

	Total Efficiency vs I1out
	90
	80
(%)	70						Vin
Efficiency
							4.5V
							5.0V
	60						5.5V
	50
	40
	0	1	2	3	4	5	6
			Output Current (A)
	Total Power Dissipation vs I1out
	40
(mV)	30
							Vin
Ripple	20						5.5V
							5.0V
							4.5V
	10
	0
	0	1	2	3	4	5	6
			Output Current (A)
	V1out Ripple vs I1out
	8
(Watts)	6
							Vin
	4						5.5V
PDiss							5.0V
							4.5V
	2
	0
	0	1	2	3	4	5	6
			Output Current (A)
	Safe Operating Area vs I1out
	90.0
( C)	80.0
Temperature	70.0
	50.0						Airflow
	60.0						200LFM
							120LFM
Ambient							60LFM
	40.0						Nat conv
	30.0
	20.0
	0.0	1.0	2.0	3.0	4.0	5.0	6.0

Output Current (A)

Note: All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com