PT78HT200 Datasheet, PDF (1/3 Pages) Texas Instruments – 2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR

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PT78HT200 S e r i e s
2 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
• High Efficiency > 85%
• Wide Input Range
• Self-Contained Inductor
• Short-Circuit Protection
• Over-Temperature Protection
• Fast Transient Response
This is the new generation of the
PT78HT200 Series wide input range
3 terminal regulators. These ISRs have
a maximum output current of 2.0 Amps.
The output voltage is laser trimmed
for high accuracy.
These 78 series regulators have excel-
lent line and load regulation with internal
short-circuit and over-temperature protec-
tion, and are offered in a variety of standard
output voltages. These ISRs are very flex-
ible and may be used in a wide variety of
applications.
Standard Application
Vin
C1
COM
1 _PT78HT200 3
Vout
+
2
C2
COM
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
Pin-Out Information
Pin Function
1
V_in
2 GND
3
V_out
Ordering Information
PT78HT2 XX Y
Output Voltage
33 = 3.3 Volts
05 = 5.0 Volts
53 = 5.25 Volts
65 = 6.5 Volts
Package Suffix
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
Specifications
Pkg Style 500
Characteristics
(T_a = 25°C unless noted)
Output Current
Short Circuit Current
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
Vo Ripple/Noise
Transient Response
(with 100µF output cap)
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperature Range
Recommended Operating
Temperature Range
Thermal Resistance
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
Symbols
Io
Isc
V_in
∆Vo
Regline
Regload
Vn
ttr
η
ƒo
Ta
Ta
θ_ja
T_s
—
—
—
Conditions
Over Vin range
Vin = Vin min
0.1 ≥ I_o ≥ 2.0A
V_o=3.3V
Vo=5V
Vo=6.5V
Over Vin range, Io = 2.0A
T_a = 0°C to +60°C
Over Vin range
0.1 ≤ I_o ≤ 2.0A
Vin = Vin min, Io = 2.0A
50% load change
V_o over/undershoot
Vin=9V, Io = 2.0A
Vo=5V
Over Vin and Io ranges Vo=5V, 6.5V
Vo=3.3V
—
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 PT78HT200 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
PT78HT200 SERIES
Min
Typ
0.1*
—
—
6.0
9
—
9
—
10.5
—
—
±1.0
—
±0.4
—
±0.2
—
±1
—
100
5.0
—
80
700
750
950
1,000
-40
—
-40
—
—
40
-40
—
—
500
—
5
—
6.5
Max
2.0
—
15
28
28
±2.0
±0.8
±0.4
—
—
—
800
1,050
+85
+75**
—
+125
—
—
—
Units
A
Apk
V
V
V
%Vo
%Vo
%V_o
%Vo
µSec
%V_o
%
kHz
kHz
°C
°C
°C/W
°C
G’s
G’s
Grams
16
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