Texas Instruments 78HT265HC, 78HT253VC, 78HT253HC, 78HT233VC, 78HT233SC Datasheet

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7 8 H T 2 0 0 S e r i e s

2 AMP POSITIVE STEP-DOWN	Revised 9/22/99
INTEGRATED SWITCHING REGULATOR

•High Efficiency > 82%

•Wide Input Range

•Self-Contained Inductor

•Short-Circuit Protection

•Over-Temperature Protection

•Fast Transient Response

The 78HT200 is a series of wide input voltage, 3 terminal Integrated Switching Regulators (ISRs). Employing a ceramic substrate, these ISRs have a maximum output current of 2A. The output voltage is laser trimmed for high accuracy.

The 78HT200 series regulators have internal short-circuit and overtemperature protection and may be used in a wide variety of applications.

Pin-Out Information	Ordering Information
Pin No. Function	78HT2	XX	Y C

Standard Application				1	Vin
				2	GND
				3	Vout
Vin	1	78HT200	3	Vout
C1		2	C2	+
GND				GND

C1 = Optional 1µF ceramic

C2 = Required 100µF electrolytic

Output Voltage			Package Suffix
33	= 3.3 Volts		V = Vertical Mount
46	= 4.6 Volts		S = Surface Mount
05 = 5.0 Volts			H = Horizontal
53	= 5.25 Volts		Mount
65	= 6.5 Volts
75	= 7.5 Volts
10	= 10.0 Volts

(For dimensions and PC board layout see Package Style 500.)

Specifications

Characteristics				78HT200 SERIES
(Ta = 25°C unless noted)	Symbols	Conditions		Min	Typ	Max	Units
Output Current	Io	Over Vin range		0.1*	—	2.0	A
Input Voltage Range	Vin	Io = 0.1 to 2.0A	Vo < 4.6V	7	—	15	V
			Vo > 4.6V	Vo +2V	—	28	V
Output Voltage Tolerance	∆Vo	Over Vin range, Io = 2.0A		—	±1.0	±2.0	%Vo
		Ta = 0°C to +60°C
Line Regulation	Regline	Over Vin range		—	±0.4	±0.8	%Vo
Load Regulation	Regload	0.1 ≤ Io ≤ 2.0A		—	±0.2	±0.4	%Vo
Ripple/Noise	Vn	Vin = Vin min, Io = 2.0A		—	1	—	%Vo
Transient Response	ttr	50% load change		—	100	—	µSec
(with 100µF output cap)		Vo over/undershoot			5.0		%Vo
Efficiency	η	Vin = 9V, Io = 2.0A, Vo = 5V		—	82	—	%
Switching Frequency	ƒo	Over Vin and Io ranges Vo > 4.6V		700	750	800	kHz
			Vo = 3.3V	0.95	1.0	1.05	MHz
Absolute Maximum	Ta	—		-40	—	+85	°C
Operating Temperature Range
Recommended Operating	Ta	Free Air Convection, (40-60LFM)		-40	—	+85**	°C
Temperature Range		Over Vin and Io ranges
Thermal Resistance	θja	Free Air Convection, (40-60LFM)		—	38	—	°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	—	—		—	7	—	Grams

* ISR will operate down to no load with reduced specifications.

** See Thermal Derating chart.

Note: The 78HT200 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.

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