Texas Instruments PT78HT205V, PT78HT233H, PT78HT233S, PT78HT253H, PT78HT253S Datasheet
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For assistance or to order, call (800) 531-5782
PT78HT200 Series
2 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
Standard Application
Vin
C1
1
PT78HT200
2
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
• High Efficiency > 85%
• Wide Input Range
• Self-Contained Inductor
• Short-Circuit Protection
• Over-Temperature Protection
• Fast Transient Response
a maximum output current of 2.0 Amps.
The output voltage is laser trimmed
for high accuracy.
These 78 series regulators have excellent line and load regulation with internal
short-circuit and over-temperature protection, and are offered in a variety of standard
This is the new generation of the
PT78HT200 Series wide input range
3 terminal regulators. These ISRs have
Pin-Out Information
Pin Function
1V
in
2 GND
3V
out
C2
Vout
+
COMCOM
3
output voltages. These ISRs are very flexible and may be used in a wide variety of
applications.
Ordering Information
PT78HT2
Output Voltage
33 = 3.3 Volts
05 = 5.0 Volts
53 = 5.25 Volts
65 = 6.5 Volts
Y
XX
Package Suffix
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
Pkg Style 500
Specifications
Characteristics
(Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units
Output Current I
Short Circuit Current I
Input Voltage Range V
Output Voltage Tolerance ∆V
Line Regulation Reg
Load Regulation Regload 0.1 ≤ Io ≤ 2.0A — ±0.2 ±0.4 %V
V
Ripple/Noise V
o
Transient Response t
(with 100µF output cap) Vo over/undershoot 5.0 %V
Efficiency η Vin=9V, Io = 2.0A Vo=5V — 80 — %
Switching Frequency ƒ
Absolute Maximum T
Operating Temperature Range
Recommended Operating T
Temperature Range Over Vin and Io ranges
Thermal Resistance θ
Storage Temperature T
Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s
Mechanical Vibration — Per Mil-STD-883D, Method 2007.2,
Weight — — — 6.5 — Grams
*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.
o
sc
in
o
line
n
tr
o
a
a
ja
s
Over Vin range 0.1* — 2.0 A
Vin = V
min — 6.0 — Apk
in
0.1 ≥ Io ≥ 2.0A Vo=3.3V 9 — 15 V
Over Vin range, Io = 2.0A
Ta = 0°C to +60°C
Over Vin range — ±0.4 ±0.8 %V
Vin = V
min, I
in
50% load change — 100 — µSec
Over Vin and Io ranges Vo=5V, 6.5V 700 750 800 kHz
— -40 — +85 °C
Free Air Convection, (40-60LFM)
Free Air Convection, (40-60LFM) — 40 — °C/W
— -40 — +125 °C
20-2000 Hz, soldered in a PC board
V
=5V 9 — 28 V
o
Vo=6.5V 10.5 — 28 V
= 2.0A — ±1 — %Vo
o
Vo=3.3V 950 1,000 1,050 kHz
PT78HT200 SERIES
— ±1.0 ±2.0 %Vo
-40 — +75** °C
—5
—
o
o
o
G’s
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Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
CHARACTERISTIC DATA
PT78HT233 3.3 VDC (See Note 1)
For assistance or to order, call (800) 531-5782
PT78HT200 Series
PT78HT205 5.0 VDC (See Note 1)
Wide Input Range Products
DATA SHEETS
Efficiency vs Output Current
100
90
80
70
Efficiency - %Ripple-(mV)Iout-(Amps)PD-(Watts)
60
50
40
0 0.5 1 1.5 2
Iout-(Amps)
Ripple vs Output Current
120
100
80
60
40
20
0
00.511.52
Iout-(Amps)
Thermal Derating (Ta) (See Note 2)
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
9 12151821242730
70°C
85°C
Vin-(Volts)
60°C
50°C
Efficiency vs Output Current
100
Vin
9.0V
10.0V
15.0V
90
80
70
Efficiency - %Ripple-(mV)Iout-(Amps)PD-(Watts)
60
50
40
00.511.52
Vin
9.0V
12.0V
15.0V
18.0V
24.0V
28.0V
Iout-(Amps)
Ripple vs Output Current
120
Vin
26.0V
20.0V
15.0V
10.0V
9.0V
100
80
60
40
20
0
00.511.52
Vin
28.0V
24.0V
18.0V
15.0V
12.0V
9.0V
Iout-(Amps)
Thermal Derating (Ta) (See Note 2)
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
9 1215182124 2730
85°C
Vin-(Volts)
70°C
50°C
60°C
Power Dissipation vs Output Current
2.5
2
1.5
1
0.5
0
00.511.52
Iout-(Amps)
Note 1: All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note 2: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.)
Vin
26.0V
20.0V
15.0V
10.0V
9.0V
Power Dissipation vs Output Current
2.5
2
1.5
1
0.5
0
0 0.5 1 1.5 2
Iout-(Amps)
Vin
28.0V
24.0V
18.0V
15.0V
12.0V
9.0V
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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