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PT78HT233

更新时间： 2024-02-15 20:10:44
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3.3Vout 2Amp Wide-Input Positive Step-Down ISR

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PT78HT233 数据手册

 浏览型号PT78HT233的Datasheet PDF文件第2页浏览型号PT78HT233的Datasheet PDF文件第3页 
PT78HT200 Series  
2 Amp Positive Step-Down  
Integrated Switching Regulator  
SLTS057B  
(Revised 10/15/2000)  
•
•
•
•
•
•
High Efficiency: Up to 90%  
Wide Input Range  
Self-Contained Inductor  
Short-Circuit Protection  
Over-Temperature Protection  
Fast Transient Response  
current of 2A. The output voltage is  
also laser trimmed for high accuracy.  
Features include excellent line and  
load regulation, internal short-circuit  
and over-temperature protection.  
The PT78HT200 series is available  
in three package outlines, including  
horizontal SMD. Their small size and  
output voltage selection makes these  
regulators ideal for use in a variety  
of applications.  
The PT78HT200 is a series of fixed  
output, wide-input range, 3-terminal  
Integrated Switching Regulators (ISRs).  
These ISRs have a maximum output  
Pin-Out Information  
Ordering Information  
PT78HT2  
XX  
Y
Pin Function  
1
2
3
V
in  
Standard Application  
GND  
Vout  
Output Voltage  
Package Suffix  
V
S
H
= Vertical Mount  
= Surface Mount  
= Horizontal  
Mount  
33 = 3.3 Volts  
05 = 5.0 Volts  
53 = 5.25 Volts  
65 = 6.5 Volts  
08 = 8.0 Volts  
Vin  
Vout  
1
3
PT78HT200  
2
+
C1  
COM  
C2  
COM  
C1 = Optional 1µF ceramic  
C2 = Required 100µF electrolytic (1)  
Pkg Style 500  
Specifications  
PT78HT200 SERIES  
Typ  
Characteristics  
(Ta = 25°C unless noted)  
Symbols  
Io  
Conditions  
Min  
0.1  
—
Max  
2.0  
—
Units  
A
(2)  
Output Current  
Over Vin range  
Vin = Vin min  
0.1 ≥ Io ≥ 2.0A  
—
Short Circuit Current  
Input Voltage Range  
Isc  
6.0  
Apk  
Vin  
Vo =3.3V  
Vo =5.0V  
9
—
—
—
—
15  
28  
28  
28  
9
V
V
o =6.5V  
10.5  
12  
Vo =8.0V  
Output Voltage Tolerance  
∆Vo  
Over Vin range, Io = 2.0A  
Ta = 0°C to +60°C  
—
1.0  
2.0  
%Vo  
Line Regulation  
Load Regulation  
Vo Ripple/Noise  
Regline  
Regload  
Vn  
Over Vin range  
—
—
—
—
0.ꢀ  
0.2  
1
0.8  
0.ꢀ  
—
%Vo  
%Vo  
%Vo  
0.1 ≤ Io ≤ 2.0A  
Vin = Vin min, Io = 2.0A  
Transient Response  
(with 100µF output cap)  
ttr  
50% load change  
Vo over/undershoot  
100  
5.0  
—
µSec  
%Vo  
Efficiency  
η
V
in=9V, Io = 2.0A  
in =12V, Io =2.0A  
Vo =3.3V  
Vo =5.0V  
Vo =8.0V  
—
—
—
80  
85  
90  
—
—
—
V
%
Vin =15V, Io =2.0A  
Switching Frequency  
ƒo  
Over Vin and Io ranges  
V
V
o ≥5.0V  
o =3.3V  
700  
950  
750  
800  
kHz  
°C  
1,000  
1,050  
Absolute Maximum  
Ta  
Over Vin range  
-ꢀ0  
—
+85 (3)  
Operating Temperature Range  
Thermal Resistance  
Storage Temperature  
Mechanical Shock  
θja  
Ts  
—
—
Free Air Convection, (ꢀ0-60LFM)  
—
—
-ꢀ0  
—
ꢀ0  
—
500  
5
—
°C/W  
°C  
+125  
—
Per Mil-STD-883D, Method 2002.3  
G’s  
Mechanical Vibration  
Per Mil-STD-883D, Method 2007.2,  
20-2000 Hz, soldered in a PC board  
—
—
G’s  
Weight  
—
—
—
6.5  
—
Grams  
Notes: (1) The PT78HT200 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.  
(2) ISR will operate down to no load with reduced specifications.  
(3) See Safe Operating Area curves for derating  
For technical support and more information, see inside back cover or visit www.ti.com/powertrends  
123

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