Sipex Corporation SPX2955AS, SPX2955AS-3.3, SPX2955AS-5.0, SPX2955AT3, SPX2955AT3-3.3 Datasheet

	SPX2955/56/57
	350mA Low Drop Out Voltage Regulator
	with Shutdown
	(PRELIMINARY INFORMATION)
FEATURES	APPLICATIONS
• Output Accuracy 5V, 3.3V@ 350mA Output	• Battery Powered Systems
• Very Low Quiescent Current	• Cordless Telephones
• Low Dropout Voltage	• Radio Control Systems
• Extremely Tight Load And Line Regulation	• Portable/Palm Top/Notebook Computers
• Very Low Temperature Coefficient	• Portable Consumer Equipment
• Current & Thermal Limiting	• Portable Instrumentation
• Error Flag Warns Of Output Dropout	• Automotive Electronics
• Logic-Controlled Electronic Shutdown	• SMPS Post-Regulator
• Output Programmable From 1.24V to 29V	• Voltage Reference

PRODUCT DESCRIPTION

The SPX2955/56/57 is a low power voltage regulator. This device is an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. The SPX2955/56/57 features very low quiescent current (100 A Typ.) and very low dropout voltage. This includes a tight initial tolerance of 1% max and 2% max., and very low output temperature coefficient, making the SPX2955/56/57 useful as a low-power voltage reference.

The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. The SPX2955/56/57 is offered in 3-pin and 5-pin TO-220 package compatible with other 5 volt and adjustable regulators, in 8-Pin Plastic Dip SO-8 (same pin out as SPX2951) and surface mount TO-263 packages.

The regulator output voltage (of the 8-pin package and 5-pin TO-220 & TO-263) may be pin-strapped for a 5V and 3.3V or programmed from 1.24V to 29V with an external pair of resistors. Look for SPX2951 for 150mA and SPX2954 for 250mA applications.

PIN CONNECTIONS

TO-263-5 Package

SPX2956/57

1 2 3 4 5

Top View

Five Lead Package Pin Functions:

SPX2956		SPX2957
1)	ERROR	ADJUST
2)	INPUT	SHUTDOWN
3)	GND	GND
4)	OUTPUT	INPUT
5)	SHUTDOWN	OUTPUT

TO-220-5 Package

8-Pin Surface Mount

	OUTPUT	1	8	INPUT
	SENSE	2	ALPHA 7	FEEDBACK
SPX2956/57	SHUTDOWN	3	SPX2955AS29306	5V/ 3.3V TAP
	GROUND	4	5	ERROR

Top View

1 2 3 4 5

Top View

TO-220-3 Package
SPX2955	3	VOUT
	1	VIN
	2	GND
Front View
TO-263-3 Package
		3 VOUT
SPX2955		2 GND
		1 V IN
Front View

Rev. 11/21/00

SPX2955/56/57

ABSOLUTE MAXIMUM RATINGS

Power Dissipation..........................................	Internally Limited
Lead Temp. (Soldering, 5 Seconds) ................................	260°C
Storage Temperature Range ..............................	-65° to +150°C
Operating Junction Temperature Range (Note 9)
SPX2955/56/57......................................	-40C° to +125°C

Operating Input Supply Voltage	....................... 3.0V to +60V
Feedback Input Voltage ..................................	-1.5V to +30V
Shutdown Input Voltage..................................	-0.3V to +30V
Error Comparator Output ................................	-0.3V to +30V
ESD Rating ............................................................	2KV Min

ELECTRICAL CHARACTERISTICS at VS=±15V,TA=25°C, unless otherwise specified. Boldface applies over the full operating temperature range.

PARAMETER	CONDITIONS	Typ.	SPX2955/56/57A		SPX2955/56		UNITS
	(Note 2)		Min	Max	Min	Max
3.3V Version
Output Voltage		3.3	3.267	3.333	3.234	3.366	V
	-	3.3	3.217	3.382	3.185	3.415
	40°C ≤TJ ≤+125°C
	1mA ≤IL ≤ 350mA
5V Version
Output Voltage	-40°C ≤TJ ≤+125°C	5.0	4.950	5.050	4.900	5.100	V
		5.0	4.880	5.120	4.870	5.130
	1mA ≤IL ≤ 350mA
All Voltage Options			SPX2955/56/57A		SPX2955/56/57
Output Voltage		20		100		150	ppm/°C
Temperature Coefficient	(Note 1)
Line Regulation ( Note 3)	6V ≤ VIN ≤30V (Note 4)	0.03		0.1		0.20	%max
				0.40		0.80
Load Regulation ( Note 3 )	IL = 1 to 350mA	0.04		0.20		0.30	%max
	IL = 0.1 to 1mA			0.30		0.50
Dropout Voltage	IL = 1mA	60		100		100	mV
( Note 5 )				150		150
	IL = 100mA	220		250		250
				300		300
	IL = 250mA	250		300		350
				420		420
	IL = 350mA	375		400		500
				500		600
Ground Current	IL = 1mA	50		100		100	A
				150		150
	IL = 100mA	0.5		1		1	mA
				2		2
	IL = 250mA	4		8		8
				10		10
	IL = 350mA	5		10		10
				15		15
Current Limit	VOUT = 0			700		700	mA
				800		800
Thermal Regulation		0.05		0.2		0.2	%/w
Output Noise,	CL = 2.2 F	400					V
10Hz to 100kHz							Vrms
IL = 100mA	CL = 33 F	260

Rev. 11/21/00

SPX2955/56/57

(Continued)

PARAMETER	CONDITIONS	Typ.	SPX2955/57A		SPX2955/57		UNITS
	(Note 2)		Min	Max	Min	Max
Adjustable Versions only		Typ.	SPX2955/57A		SPX2955/57B
Reference Voltage		1.235	1.210	1.260	1.200	1.270	V
			1.200	1.270	1.990	1.280
Reference Voltage	Over Temperature (Note 6)		1.185	1.285	1.185	1.285	V
Feedback Pin Bias Current		20		40		60	NA
				60		80
Reference Voltage Temperature	(Note 7)						ppm/°C
Coefficient		50
Feedback Pin Bias Current							nA/°C
Temperature Coefficient		0.1
Error Comparator
Output Leakage Current	V0H = 30V	0.01		1.00		1.00	A
				2.00		2.00
Output Low Voltage	VIN = 4.5V	150		250		250	mV
	I0L = 400 A			400		400
Upper Threshold Voltage	(Note 8)	60	40		40		mV
			25		25
Lower Threshold Voltage	(Note 8)	75		95		95	mV
				140		140
Hysteresis	(Note 8)	15					mV
Shutdown Input
Input logic Voltage	Low (Regulator ON)						V
	High (Regulator OFF)	1.3	2.0	0.7	2.0	0.7
Shut down Pin Input Current	VS = 2.4V	30		50		90	A
				100		150
	VS = 30V	450		600		800
				750		1000
Regulator Output Current in Shutdown		3	10			15	A
			20			25

Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.

Note 2: Unless otherwise specified all limits are guaranteed for Tj = 25°C, VIN = 6V, IL = 100 A and CL = 1 F. Additional conditions for the 8-pin versions are

feedback tied to 5V tap and output tied to output sense (VOUT = 5V) and VSHUTDOWN ≤ 0.8V.

Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation.

Note 4: Line regulation for the SPX2955/56/57 is tested at 150°C for IL = 1 mA. For IL = 100 A and TJ = 125°C, line regulation is guaranteed by design to 0.2%. See typical performance characteristics for line regulation versus temperature and load current.

Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account.

Note 6: VREF ≤VOUT ≤ (Vin - 1V), 2.3 ≤Vin≤30V, 100 A≤IL≤ 250 mA, TJ ≤ TJMAX.

Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.

Note 8: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT =0, Feedback pin tied to 5V Tap.

Note 9: The junction -to-ambient thermal resistance of the TO-92 package is 180°C/ W with 0.4” leads and 160°C/ W with 0.25” leads to a PC board.

The thermal resistance of the 8-Pin DIP package is 105°C/W junction-to-ambient when soldered directly to a PC board. Junction-to-ambient thermal resistance for the SOIC (S) package is 160°C/W.

Rev. 11/21/00