PT78HT200 Series
2 Amp Positive Step-Down
Integrated Switching Regulator
SLTS057B
(Revised 10/15/2000)
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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