REG1117A datasheet(8/35 Pages) BURR-BROWN

Part #	REG1117A

Description	800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85, 3.3V, 5V, and Adjustable

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Manufacturer	BURR-BROWN [Burr-Brown (TI)]

Direct Link	http://www.burr-brown.com

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8 / 35 page

REG1117

REG1117A

SBVS001D − OCTOBER 1992 − REVISED JULY 2004

www.ti.com

8

TYPICAL CHARACTERISTICS (continued)

At TA = +25°C, all models, unless otherwise noted.

LOAD TRANSIENT RESPONSE

0.1

0

−0.1

0.5

0

−0.5

0

2040

6080

100

Time (

µs)

C

IN =10µF

COUT =10µF

Tantalum

V

IN =4.25V

Preload = 0.1A

LINE TRANSIENT RESPONSE

60

40

20

0

−20

−40

5.25

4.25

3.25

0

20

40

60

80

100 120 140 160 180 200

Time (

µs)

C

IN =1µF

C

OUT =10µFTantalum

I

OUT =0.1A

APPLICATIONS INFORMATION

Figure 1 shows the basic hookup diagram for fixed-voltage

models. All models require an output capacitor for proper

operation,

and

for

improving

high-frequency

load

regulation; a 10

µF tantalum capacitor is recommended.

Aluminum electrolytic types of 50

µF or greater can also be

used. A high-quality capacitor should be used to assure

that the ESR (Effective Series Resistance) is less than

0.5

Ω.

REG1117

V

O

V

IN

10

µF

Tantalum

10

µF

Tantalum

++

Figure 1. Fixed-Voltage Model—Basic

Connections

Figure 2 shows a hookup diagram for the adjustable

voltage model. Resistor values are shown for some

commonly-used output voltages. Values for other voltages

can be calculated from the equation shown in Figure 2. For

best load regulation, connect R1 close to the output pin and

R2 close to the ground side of the load as shown.

THERMAL CONSIDERATIONS

The REG1117 has current limit and thermal shutdown

circuits that protect it from overload. The thermal shutdown

activates at approximately TJ = 165°C. For continuous

operation, however, the junction temperature should not

be allowed to exceed 125

°C. Any tendency to activate the

thermal shutdown in normal use is an indication of an

inadequate heat sink or excessive power dissipation. The

power dissipation is equal to:

PD = (VIN – VOUT) IOUT

The junction temperature can be calculated by:

TJ = TA + PD (

qJA)

where TA is the ambient temperature, and qJA is the

junction-to-ambient thermal resistance.

REG1117

(Adj)

V

IN

V

O

C

2

10

µF

C

1

10

µF

C

3

(1)

10

µF

+

R

1

R

2

Load

32

1

NOTES: (1) C

3 optional. Improves high−frequency line rejection. (2) Resistors are standard 1% values.

V

O =

x (1.25V) + (50

µA) (R

2)

R

1

R

1 +R2

This term is negligible with

proper choice of values

−see

table at right.

V

OUT

R

1

R

2

(V)(

Ω)(2)

(

Ω)(2)

1.25

Open

Short

1.5

750

147

2.1

158

107

2.85

169

215

3

137

191

3.3

115

187

5

113

340

10

113

787

Figure 2. Adjustable-Voltage Model—Basic Connections

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