78HT305 Datasheet, PDF (1/3 Pages) Texas Instruments – 3 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR

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78HT300 Series
3 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Revised 6/30/98
• High Efficiency > 80%
• Wide Input Range
• Self-Contained Inductor
• Short-Circuit Protection
• Over-Temperature Protection
• Fast Transient Response
Standard Application
Vin
C1
GND
1 _78HT300 3
Vout
+
2
C2
GND
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
Pin-Out Information
Pin No. Function
1
V_in
2 GND
3
V_out
The 78HT300 is a series of wide
input voltage, 3 terminal Integrated
Switching Regulators (ISRs). Em-
ploying a ceramic substrate, these
ISRs have a maximum output current
of 3A. The output voltage is laser-
trimmed for high accuracy.
The 78HT300 series regulators
have internal short-circuit and over-
temperature protection and may be
used in a wide variety of applications.
Ordering Information
78HT3 XX Y C
Output Voltage
05 = 5.0 Volts
53 = 5.25 Volts
Package Suffix
V = Vertical Mount
H = Horizontal
Mount
(For dimensions and PC board
layout see Package Style 600.)
Specifications
Characteristics
(T_a = 25°C unless noted)
Output Current
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
Ripple/Noise
Transient Response
(with 100µF output cap)
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperature Range
Symbols
Io
Vin
∆Vo
Reg_line
Regload
Vn
ttr
η
ƒo
Ta
Conditions
Over Vin range
Io = 0.1 to 3.0A
Over Vin range
T_a = 0°C to +60°C
Over V_in range
0.1 ≤ I_o ≤ 3.0A
Vin = Vin min, Io = 3.0A
50% load change
V_o over/undershoot
V_in = 9V, I_o = 3.0A
Over Vin and Io ranges
—
Recommended Operating
Ta
Temperature Range
Thermal Resistance
θ_ja
Storage Temperature
Ts
Mechanical Shock
—
Mechanical Vibration
—
Weight
—
Free Air Convection, (40-60LFM)
Over Vin and Io ranges
Free Air Convection, (40-60LFM)
—
Per Mil-STD-883D, Method 2002.3
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
—
* ISR will operate down to no load with reduced specifications.
** See Thermal Derating chart.
Note: The 78HT300 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
78HT300 SERIES
Min
Typ
0.1*
—
Vo+3
—
—
±1.0
—
±0.4
—
±0.2
—
1
—
100
5.0
—
80
700
750
-40
—
-40
—
—
35
-40
—
—
500
—
10
—
11
Max
Units
3.0
A
28
V
±2.0
%Vo
±0.8
%V_o
±0.4
%V_o
—
%Vo
—
µSec
%V_o
—
%
800
kHz
+70
°C
+70**
—
+125
—
—
—
°C
°C/W
°C
G’s
G’s
Grams
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com