Texas Instruments 78SR174VC, 78SR174SC, 78SR174HC, 78SR153VC, 78SR153SC Datasheet

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78SR100 Series

• Very Small Footprint

• High Efficiency > 85%

• Self-Contained Inductor

• Internal Short-Circuit Protection

• Over-Temperature Protection

• Wide Input Range

1.5 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR

The 78SR100 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.

Revised 6/30/98

Standard Application

Vin

1

78SR100

Pin-Out Information

Pin Function

1V

in

2 GND
3V

out

3

Vout

Ordering Information

78SR1

Output Voltage

05 = 5.0 Volts
53 = 5.25 Volts
06 = 6.0 Volts
74 = 7.15 Volts

C

XX Y

Package Suffix

V = Vertical Mount
S = Surface Mount
H = Horizontal

Mount

08 = 8.0 Volts

C1

C2

2

GNDGND

09 = 9.0 Volts
10 = 10.0 Volts
12 = 12.0 Volts
14 = 13.9 Volts

C1 = Optional 1µF ceramic
C2 = Optional 1µF ceramic

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 Reg
V

Ripple/Noise V

o

Transient Response t

Efficiency η V

Switching Frequency ƒ
Absolute Maximum T

Operating Temperature Range
Recommended Operating T

Temperature Range At Vin= 24V, Io=1.0A
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.

o

sc

in

o

line

load

n

tr

o

a

a

ja

s

Pkg Style 500

Over Vin range 0.1* — 1.5 A

Vin = V

min — 3.5 — Apk

in

0.1 ≤ Io ≤ 1.5A Vo= 5V 7 — 30 V

Over Vin range, Io=1.5A

Ta = 0°C to +60°C

Over Vin range — ±0.2 ±0.4 %V

0.1 ≤ Io ≤ 1.5A — ±0.1 ±0.2 %V
Vin= 9V, Io= 1.5A Vo= 5V — 50 — mV

Vin= 16V, Io= 1.5A Vo= 12V 80 mV
50% load change — 100 — µSec

Vo over/undershoot — 30 — %V

= 10V, Io= 1A Vo= 5V — 85 — %

in

Vin= 17V, Io= 1A Vo= 12V — 90 — %
Over Vin range, Io=1.5A 600 650 700 kHz
—

Free Air Convection, (40-60LFM)

Free Air Convection, (40-60LFM) — 45 — °C/W
— -40 — +125 °C

20-2000 Hz, soldered in a PC board

Vo= 12V 14.5 — 30 V

15 = 15.0 Volts

78SR100 SERIES

— ±1.0 ±2.0 %V

-40 — +85 °C

-40 — +80** °C

—5

—

G’s

o

o
o

pp
pp

o

2

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com

CHARACTERISTIC DATA

For assistance or to order, call [phone]

78SR100 Series

78SR133_ 3.3 VDC (See Note 1)

78SR105_ 5.0 VDC (See Note 1)

Efficiency vs Output Current Efficiency vs Output Current

100

90

80

70

60

Efficiency (%)Ripple (mV)Iout (A)Pd (Watts)

50

40

0.0 0.5 1.0 1.5

Iout (A)

Vin

7.0V

10.0V

15.0V

20.0V

25.0V

30.0V

100

90

80

70

60

Efficiency (%)

50

40

0.0 0.5 1.0 1.5

Iout (A)

Ripple vs Output Current Ripple vs Output Current

60

50

40

30

20

10

0

0.0 0.5 1.0 1.5

Iout (A)

Vin

7.0V

10.0V

15.0V

20.0V

25.0V

30.0V

80

70

60

50

40

30

Ripple (mV)

20

10

0

0.0 0.5 1.0 1.5

Iout (A)

78SR112_ 12.0 VDC (See Note 1)

DATA SHEETS

Efficiency vs Output Current

100

90

Vin

7.0V

10.0V

15.0V

20.0V

25.0V

30.0V

80

70

60

Efficiency (%)

50

40

0.0 0.5 1.0 1.5

Vin

14.0V

20.0V

25.0V

30.0V

35.0V

Iout (A)

Ripple vs Output Current

140

Vin

7.0V

10.0V

15.0V

20.0V

25.0V

30.0V

120

100

80

60

Ripple (mV)Iout (A)

40

20

0

0.0 0.5 1.0 1.5

Iout (A)

Vin

14.0V

20.0V

25.0V

30.0V

35.0V

Thermal Derating (Ta) (See Note 2) Thermal Derating (Ta) (See Note 2)

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

9 13172125

85°C

60°C

70°C

1.6

1.4

1.2

1

0.8

Iout (A)

0.6

0.4

0.2

0

9 12151821242730333639

60°C

70°C

85°C

Thermal Derating (Ta) (See Note 2)

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

85°C

16 19 22 25 28 31 34 37 40

Vin (Volts)

Power Dissipation vs Output Current Power Dissipation vs Output Current

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

0.0 0.5 1.0 1.5

Vin

7.0V

10.0V

15.0V

20.0V

25.0V

30.0V

1.8

1.6

1.4

1.2

1.0

0.8

Pd (Watts)

0.6

0.4

0.2

0.0

0.0 0.5 1.0 1.5

Vin

7.0V

10.0V

15.0V

20.0V

25.0V

30.0V

Power Dissipation vs Output Current

2.5

2.0

1.5

1.0

Pd (Watts)

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.)

60°C

70°C

Vin (Volts)Vin (Volts)

Vin

14.0V

20.0V

25.0V

30.0V

35.0V

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com

3

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