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参数资料
| 型号： | PT78HT265T |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX |
| 文件页数： | 1/9页 |
| 文件大小： | 263K |
| 代理商： | PT78HT265T |
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
2 Amp Positive Step-Down
Integrated Switching Regulator
PT78HT200 Series
Standard Application
C1 = Optional 1F ceramic
C2 = Required 100F electrolytic (1)
Pin-Out Information
Pin
Function
1Vin
2
GND
3Vout
Ordering Information
PT78HT2
Output Voltage
XX
Y
33
= 3.3 Volts
05
= 5.0 Volts
53
= 5.25 Volts
65
= 6.5 Volts
08
= 8.0 Volts
Package Suffix
V
= Vertical Mount
S
= Surface Mount
H
= Horizontal
Mount
High Efficiency: Up to 90%
Wide Input Range
Self-Contained Inductor
Short-Circuit Protection
Over-Temperature Protection
Fast Transient Response
The PT78HT200 is a series of fixed
output, wide-input range, 3-terminal
Integrated Switching Regulators (ISRs).
These ISRs have a maximum output
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.
PT78HT200
C2
+
Vout
COM
Vin
C1
1
2
3
Pkg Style 500
SLTS057B
(Revised 10/15/2000)
Specifications
Characteristics
PT78HT200 SERIES
(Ta = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Over Vin range
0.1 (2)
—
2.0
A
Short Circuit Current
Isc
Vin = Vin min
—
6.0
—
Apk
Input Voltage Range
Vin
0.1
≥ Io ≥ 2.0A
Vo =3.3V
9
—
15
Vo =5.0V
9
—
28
V
Vo =6.5V
10.5
—
28
Vo =8.0V
12
—
28
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
Vo Ripple/Noise
Vn
Vin = Vin min, Io = 2.0A
—
±1
—
%Vo
Transient Response
ttr
50% load change
—
100
—
Sec
(with 100F output cap)
Vo over/undershoot
5.0
%Vo
Efficiency
η
Vin=9V, Io = 2.0A
Vo =3.3V
—
80
—
Vin =12V, Io =2.0A
Vo =5.0V
—
85
—
%
Vin =15V, Io =2.0A
Vo =8.0V
—
90
—
Switching Frequency
o
Over Vin and Io ranges
Vo ≥5.0V
700
750
800
kHz
Vo =3.3V
950
1,000
1,050
Absolute Maximum
Ta
Over Vin range
-40
—
+85 (3)
°C
Operating Temperature Range
Thermal Resistance
θja
Free Air Convection, (40-60LFM)
—
40
—
°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
—
6.5
—
Grams
Notes: (1) The PT78HT200 Series requires a 100F 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
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