Sipex Corporation SPX2931AS-3.0, SPX2931AS-3.3, SPX2931AS-3.5, SPX2931AU, SPX2931AU-3.0 Datasheet

		SPX2931
100mA Low Dropout Voltage Regulator
FEATURES
• 3.5V, 3.3V, and 3.0V Versions are Available	•	Reverse Battery Protection
• Output Current in Excess of 100 mA	•	Short Circuit Protection
• Input-Output Differential is Less Than 0.6V	• 60V Load Dump Protection
• Mirror-Image Insertion Protection	• -20V Reverse Transient Protection
• Internal Thermal Overload Protection	APPLICATION
• Available in TO-220, TO-92, SOT-89, and SO-8 Package Types	•	Portable Instrumentation
• Available as Adjustable with TTL Compatible Switch	•	Radio Control Systems
• Similar Improved to Industry Standard LM2931	•	Cordless Telephones

PRODUCT DESCRIPTION

The SPX2931 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 SPX2931 features offers very low quiescent currents

(0.4 mA.), and very low drop output voltage (typ. 50 mV at light load and 300 mV at 100 mA). Other features include the logiccompatible On/Off input which enables the regulator to be switched on and off. The SPX2931 is offered in a 3-pin TO-92/TO-220 package and SOT-89/SO-8 package.

PIN CONNECTIONS

	TO-92 (N)							SOT-89 (M1)				8-Pin Surface Mount (S)
1			2		3										Fixed Output
											VOUT
								SPX2931							1	8				VIN

	1	2	3	GND	2	7	GND
VOUT	VIN			GND		SPX2931	GND
					3	6
GND	VIN	GND	VOUT	BYP	4	5	ON/OFF

Bottom View

Top View

Top View

TO-220-3 (U)

Fixed

SPX2931
1	2	3

Front View

1.VIN

2.GND

3.VOUT

Rev. 10/24/00

SPX2931

ABSOLUTE MAXIMUM RATINGS

Power Dissipation...........................................	Internally limited
Lead Temp. (soldering, 5 Seconds).................................	260°C
Storage Temperature Range ...........................	-65°C to +150°C
Operating Junction Temperature Range ...........	-40°C to +85°C
Input Supply Voltage.............................................	-0.3 to +26V
ESD Rating.........................................................................	2KV

ELECTRICAL CHARACTERISTICS at VS = 14V, TA = 25°C, IO = 10 mA, C2 = 100 µF, unless otherwise specified. ( Note 1)

Parameter	Conditions		SPX2931A						SPX2931				Units
		Min		Typ		Max		Min		Typ		Max
3.0 Volt Version		SPX2931A-3							SPX2931-3
Output Voltage	6V<VIN< 26V,	2.94		3.00		3.06	2.91			3.00		3.09	V
				3.00						3.00			V
	IO = 100 mA Over Temp.	2.88				3.12	2.85					3.15
3.3 Volt Version				SPX2931A-3.3					SPX2931-3.3
Output Voltage	6V < VIN< 26V,	3.23		3.30		3.36	3.20			3.30		3.39	V
				3.30						3.30			V
	IO = 100 mA Over Temp.	3.20				3.39	3.16					3.43
5 Volt Version				SPX2931A	-5					SPX2931-	5
Output Voltage	6V <VIN< 26V,	4.81		5.00		5.19	4.75			5.00		5.25	V
													V
	IO =100 mA Over Temp.	4.75				5.25	4.5					5.5
All Voltage Options
Long Term Stability				20						20			mV/1000
Line Regulation	9V < VIN < 16V			2.0		10				4.0		30	mV
	6V < VIN < 26V,			4.0		30
Load Regulation	5 mA < IO < 100 mA			14		50				14		50	mV
Dropout Voltage	IO=10 mA			0.05		0.2				0.05		0.2	V
	IO=50 mA			0.07		0.1				0.07		0.1	V
	IO=100 mA			0.3		0.6				0.3		0.6	V
Quiescent Current	IO < 10 mA, 6V < VIN < 26V			0.4		1.0				0.4		1.0	mA
	-40°C < Tj < 85°C			15						15			mA
	IO = 100 mA, VIN = 14V,
	TJ = 25°C
Maximum Operational Input		26		33				26		33			V
Voltage
Maximum Line Transient	RL= 500Ω, VO<5.5V, 100ms	60		70				50		70			V
Reverse Polarity Input	VO > -0.3V, RL = 500Ω	-15		-30				-15		30			V
Voltage, DC
Reverse Polarity Input	1% Duty Cycle, τ < 100ms,	-50		-80				-50		-80			V
Voltage, Transient	RL = 500Ω
Output Noise Voltage	10Hz-100kHz, COUT=100µF			500						500			µVrms
Ripple Rejection	FO = 120Hz			80						80			dB

Note 1: See TYPICAL APPLICATIONS notes to ensure constant junction temperature, low duty cycle pulse testing used. Note 2: All limits are at 25°C or over the full operating temperature junction range of -40°C to +85°C.

Note 3: The maximum power dissipation is a function of maximum junction temperature, total thermal resistance, and ambient temperature. Note 4: Human body model, 100 µF discharged through 1.5 KΩ.

Rev. 10/24/00

SPX2931

Application Hints

The SPX2931 requires an output capacitor for device stability. The value required varies greatly depending upon the application circuit and other factors. The high frequency characteristics of electrolytic capacitors depend greatly on the type and also on the manufacturer. Sometimes only bench testing is the only means to determine the proper capacitor type and value. The high quality 100 F aluminum electrolytic covers all general application circuits, this stability can be obtained with a tantalum electrolytic value of 47 F.

Another critical point of electrolytic characteristics is its performance over temperature. The SPX2931 is designed to operate starting at -40°C which may not be true in the case of electrolytic. Higher temperatures generally no problem. The electrolytic. type in aluminum will freeze around -30°C. This could cause an oscillation at output of regulator. At a lower temperature requirement by many applications the capacitor should maintain its performance. So as a result, for an application which regulator junction temperature does not exceed 25°C, the output capacitor can be reduced by the

factor of two over the value needed for the entire temperature range.

Other points with linear regulators is that the twitch higher output current stability decreases. In most applications the SPX2931 is operating at few milliamps. In these applications the output capacitance can be further reduced. For example, when the regulator is running at 10mA output current the output capacitance value is half compared to the same regulator that is running at 100 mA.

With the SPX2931 adjustable regulator, the minimum value of output capacitance is a function of the output voltage. The value decreases with higher output voltages, since the internal loop gain is reduced.

The worst case occurs at the lower temperature and maximum operating currents, the entire circuit and the electrolytic, should be cooled down to the minimum temperature. The minimum of 0.6 volts required at the input of regulator above the output to keep the power dissipation and die heating to its minimum. After the value for the capacitor has been determined for actual use, the value should be doubled.

Rev. 10/24/00