Texas Instruments PT78ST105H, PT78ST105S, PT78ST105V, PT78ST106H, PT78ST106S Datasheet

For assistance or to order, call [phone]											Application Notes
											Mechanical Outline
P T 7 8 S T 1 0 0 S e r i e s											Product Selector Guide
						1.5 AMP POSITIVE STEP-DOWN					Revised 7/15/98
						INTEGRATED SWITCHING REGULATOR
				•	Very Small Footprint			3 terminal regulators. These ISRs have a
				• High Efficiency > 85%				maximumoutputcurrentof 1.5Ampsandan
				•	Self-Contained Inductor			output voltage that is laser trimmed to a variety
				•	Internal Short-Circuit Protection			of industrystandard voltages.
				•	Over-Temperature Protection				These 78 series regulators have excellent
				•	Fast Transient Response			line and load regulation with internal short-
				•	Wide Input Range			circuit and over-temperature protection, and
					This is the new generation of			are offered in a variety of standard output
								voltages. These ISRs are very flexible and
				PT78ST100 Series wide input range				may be used in a wide variety of applications.
				Pin-Out Information				Ordering Information
					Pin	Function		PT78ST1 XX		Y
					1	Vin		Output Voltage		Package Suffix
Standard Application					2	GND
								33 = 3.3 Volts		V = Vertical Mount
					3	Vout
								36 = 3.6 Volts		S = Surface Mount
Vin	1 PT78ST100		3	Vout				05 = 5.0 Volts		H = Horizontal
								51 = 5.1 Volts			Mount
				+				53 = 5.25 Volts
C1		2	C2					06 = 6.0 Volts
COM				COM				65 = 6.5 Volts
								07 = 7.0 Volts
								08 = 8.0 Volts
	C1 = Optional 1µF ceramic							09 = 9.0 Volts
	C2 = Required 100µF electrolytic							10 = 10.0 Volts
								12 = 12.0 Volts
								14 = 13.9 Volts
						Pkg Style 500		15 = 15.0 Volts
Specifications
Characteristics								PT78ST100 SERIES
(Ta = 25°C unless noted)				Symbols	Conditions			Min	Typ	Max	Units
Output Current				Io	Over Vin range			0.1*	—	1.5	A
Short Circuit Current				Isc	Vin = Vin min			—	3.5	—	Apk
Input Voltage Range				Vin	0.1 ≤ Io ≤ 1.5A		Vo= 3.3V	9	—	26	V
							Vo= 5V	9	—	38	V
							Vo= 12V	16	—	38	V
Output Voltage Tolerance				Vo	Over Vin range, Io=1.5A			—	±1.0	±2.0	%Vo
					Ta = 0°C to +60°C
Line Regulation				Regline	Over Vin range			—	±0.2	±0.4	%Vo
Load Regulation				Regload	0.1 ≤ Io ≤ 1.5A			—	±0.1	±0.2	%Vo
Vo Ripple/Noise				Vn	Vin= 9V, Io= 1.5A		Vo= 5V	—	65	—	mVpp
					Vin= 16V, Io= 1.5A		Vo= 12V		90		mVpp
Transient Response				ttr	50% load change			—	100	—	µSec
(with 100µF output cap)					Vo over/undershoot			—	5	—	%Vo

Efficiency	η	Vin= 10V, Io= 1A	Vo= 3.3V
		Vin= 10V, Io= 1A	Vo= 5V
		Vin= 17V, Io= 1A	Vo= 12V

—	80	—	%
—	85	—	%
—	90	—	%

Switching Frequency	ƒo	Over Vin range, Io=1.5A	600	650	700	kHz
Absolute Maximum	Ta	—	-40	—	+85	°C
Operating Temperature Range
Recommended Operating	Ta	Free Air Convection, (40-60LFM)	-40	—	+80**	°C
Temperature Range		At Vin= 24V, Io=1.0A
Thermal Resistance	θja	Free Air Convection, (40-60LFM)	—	45	—	°C/W
Storage Temperature	Ts	—	-40	—	+125	°C
Mechanical Shock	—	Per Mil-STD-883D, Method 2002.3	—	500	—	G’s
Mechanical Vibration	—	Per Mil-STD-883D, Method 2007.2,	—	5	—	G’s
		20-2000 Hz, soldered in a PC board
Weight	—	—	—	6.5	—	grams
*ISR will operate down to no load with reduced specifications.		**See Thermal Derating chart.

Note: The PT78ST100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.

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