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Part: 78ST105SC
Category:
Power Management
-> Plug-in Power Solutions->Non-Isolated->Single Posi
Description: ti 78ST105, 5Vout 1.5A Wide Input Positive Step-down Isr
Company: Texas Instruments, Inc.
Datasheet: Download 78ST105SC datasheet File size : 137 kB
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Datasheet text preview:
For assistance or to order, call
(800) 531-5782
78ST100
Series
1.5 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR
Revised 6/30/98
· · · · · · ·
Very Small Footprint High Efficiency > 85% Self-Contained Inductor Internal Short-Circuit Protection Over-Temperature Protection Fast Transient Response Wide Input Range
The 78ST100 is a series of wide input voltage, 3-terminal Integrated Switching Regulators (ISRs). These ISRs have a maximum output current of 1.5A and an output voltage that is laser trimmed to a variety of industry standard voltages. These 78 series regulators have excellent line and load regulation with internal shortcircuit and over-temperature protection, are very flexible, and may be used in a wide variety of applications.
Pin-Out Information
Pin
1
Ordering Information
Function
V in GND Vo u t
78ST1 XX
Output Voltage 33 = 3.3 Volts 36 = 3.6 Volts 05 = 5.0 Volts 51 = 5.1 Volts 65 = 6.5 Volts 07 = 7.0 Volts 08 = 8.0 Volts 09 = 9.0 Volts 12 = 12.0 Volts
YC
Package Suffix V = Vertical Mount S = Surface Mount H = Horizontal Mount
Standard Application
Vin
1
2 3
78ST100
2
3
Vout + GND
C1 GND
C2
C1 = Optional 1µF ceramic C2 = Required 100µF electrolytic
Specifications
Characteristics (Ta = 25°C unless noted) Output Current Short Circuit Current Input Voltage Range Symbols Io Isc Vin Vo Regline Regload Vn ttr
Pkg Style 500
78ST100 SERIES
Conditions Over Vin range
Vin = Vin min
Min 0.1* -- Vo= 3.3V Vo= 5V Vo= 12V 7 7 14.5 -- -- -- Vo= 5V Vo= 12V -- -- -- Vo= 3.3V Vo= 5V Vo= 12V -- -- -- 600 -40 -40 -- -40 -- -- --
Typ -- 3.5 -- -- -- ±1.0 ±0.2 ±0.1 65 90 100 5 80 85 90 650 -- -- 45 -- 500 5 6.5
Max 1.5 -- 26 30 30 ±2.0 ±0.4 ±0.2 -- -- -- -- -- -- 700 +85 +80** -- +125 -- -- --
Units A Apk V V V %Vo %Vo %Vo mVpp mVpp µSec %Vo % % % kHz °C °C °C/W °C G's G's grams
0.1 Io 1.5A Over Vin range, Io=1.5A
Ta = 0°C to +60°C
Output Voltage Tolerance Line Regulation Load Regulation Vo Ripple/Noise Transient Response (with 100µF output cap) Efficiency
Over Vin range 0.1 Io 1.5A Vin= 9V, Io= 1.5A Vin= 16V, Io= 1.5A 50% load change Vo over/undershoot Vin= 10V, Io= 1A Vin= 10V, Io= 1A Vin= 17V, Io= 1A Over Vin range, Io=1.5A -- Free Air Convection, (40-60LFM) At Vin= 24V, Io=1.0A 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 --
**See Thermal Derating chart.
Switching Frequency Absolute Maximum Operating Temperature Range Recommended Operating Temperature Range Thermal Resistance Storage Temperature Mechanical Shock Mechanical Vibration Weight
o Ta Ta
ja
Ts -- -- --
*ISR will operate down to no load with reduced specifications.
Note: The 78ST100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
2
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
For assistance or to order, call
(800) 531-5782
78ST100
CHARACTERISTIC DATA
Series
78ST133_ 3.3 VDC
(See Note 1)
78ST105_ 5.0 VDC
(See Note 1)
78ST112_ 12.0 VDC
DATA SHEETS
(See Note 1)
Efficiency vs Output Current
100 100
Efficiency vs Output Current
100
Efficiency vs Output Current
90
90
90
Efficiency (%)
Efficiency (%)
Efficiency (%)
Vin
80
7.0V 10.0V 15.0V 20.0V 25.0V 30.0V
Vin
80
7.0V 10.0V 15.0V 20.0V 25.0V 30.0V
80
Vi n
14.0V 20.0V 25.0V 30.0V 35.0V
70
70
70
60
60
60
50
50
50
40 0.0 0.5 1.0 1.5
40 0.0 0.5 1.0 1.5
40 0.0 0.5 1.0 1.5
Iout (A)
Iout (A)
Iout (A)
Ripple vs Output Current
60 50
Ripple vs Output Current
80 70 140 120
Ripple vs Output Current
Vi n
60
Vi n
7.0V 10.0V 15.0V 20.0V 25.0V 30.0V
Ripple (mV)
Ripple (mV)
40 30 20 10 0 0.0 0.5 1.0 1.5
7.0V 10.0V 15.0V 20.0V 25.0V 30.0V
Ripple (mV)
100 80 60 40 20 0
Vi n
14.0V 20.0V 25.0V 30.0V 35.0V
50 40 30 20 10 0 0.0 0.5 1.0 1.5
0.0
0.5
1.0
1.5
Iout (A)
Iout (A)
Iout (A)
Thermal Derating (Ta)
1. 6 1. 4 1. 2 1 0. 8 0. 6 0. 4 0. 2 0 9 13 17 21
(See Note 2)
1. 6
Thermal Derating (Ta)
1. 4
(See Note 2)
1.6 1.4
Thermal Derating (Ta)
(See Note 2)
60°C 70°C 85°C 60°C
1. 2 1.2
60°C 70°C
70°C
Iout (A)
Iout (A)
Iout (A)
1
1
85°C
0. 8 0. 6 0. 4 0. 2 0
85°C
0.8 0.6 0.4 0.2 0
25
9
12
15
18
21
24
27
30
33
36
39
16
19
22
25
28
31
34
37
40
Vin (Volts)
Vin (Volts)
Vin (Volts)
Power Dissipation vs Output Current
1.8 1.6 1.4 1.8 1.6
Power Dissipation vs Output Current
2.5
Power Dissipation vs Output Current
Vi n
7.0V 10.0V 15.0V 20.0V 25.0V 30.0V
1.4
2.0
Vi n
7.0V 10.0V 15.0V 20.0V 25.0V 30.0V
Pd (Watts)
Pd (Watts)
Pd (Watts)
1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.0 0.5 1.0 1.5
1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.0 0.5 1.0 1.5
Vi n
1.5
14.0V 20.0V 25.0V 30.0V 35.0V
1.0
0.5
0.0 0.0 0.5 1.0 1.5
Iout (A)
Iout (A)
Iout (A)
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.)
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
3
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