TL1963A-15_技术文档

TL1963A-xx

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1.5-A LOW-NOISE FAST-TRANSIENT-RESPONSE LOW-DROPOUT REGULATOR

1

FEATURES

2

•

Optimized for Fast Transient Response

•

Reverse-Battery Protection

No Reverse Current

Thermal Limiting

Output Current: 1.5 A

Dropout Voltage: 340 mV

Low Noise: 40 µV_RMS(10 Hz to 100 kHz)

1-mA Quiescent Current

APPLICATIONS

•

3.3-V to 2.5-V Logic Power Supplies

Post Regulator for Switching Supplies

No Protection Diodes Needed

Controlled Quiescent Current in Dropout

Fixed Output Voltages: 1.5 V, 1.8 V, 2.5 V,

and 3.3 V

KTT PACKAGE

(TOP VIEW)

•

Adjustable Output Voltage: 1.21 V to 20 V

SENSE/ADJ

OUT

5

4

3

2

1

Less Than 1-µA Quiescent Current in

Shutdown

GND

IN

•

Stable with 10-µF Output Capacitor

SHDN

Stable with Ceramic Capacitors

DESCRIPTION/ORDERING INFORMATION

The TL1963A-xx is a low-dropout (LDO) regulator optimized for fast transient response. The device can supply

1.5 A of output current with a dropout voltage of 340 mV. Operating quiescent current is 1 mA, dropping to less

than 1 µA in shutdown. Quiescent current is well controlled; it does not rise in dropout as it does with many other

regulators. In addition to fast transient response, the TL1963A-xx regulators have very low output noise, which

makes them ideal for sensitive RF supply applications.

Output voltage range is from 1.21 V to 20 V. The TL1963A-xx regulators are stable with output capacitors as low

as 10 µF. Small ceramic capacitors can be used without the necessary addition of ESR, as is common with other

regulators. Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting, and

reverse-current protection. The devices are available in fixed output voltages of 1.5 V, 1.8 V, 2.5 V, and 3.3 V,

and as an adjustable device with a 1.21-V reference voltage. The TL1963A-xx regulators are available in the

5-pin TO-263 (KTT) package.

ORDERING INFORMATION⁽¹⁾

V_OUT

T_A

PACKAGE⁽²⁾

ORDERABLE PART NUMBER

TOP-SIDE MARKING

TL1963A-15

(TYP)

1.5 V

1.8 V

2.5 V

3.3 V

ADJ

TL1963A-15KTTR

TL1963A-18KTTR

TL1963A-25KTTR

TL1963A-33KTTR

TL1963AKTTR

TL1963A-18

TL1963A-25

TL1963A-33

TL1963A

–40°C to 125°C

TO-263 (KTT)

Reel of 500

(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerPAD, PowerFLEX are trademarks of Texas Instruments.

UNLESS OTHERWISE NOTED this document contains

PRODUCTION DATA information current as of publication date.

Products conform to specifications per the terms of Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

TL1963A-xx

SLVS719A–JUNE 2008–REVISED AUGUST 2008 ........................................................................................................................................................ www.ti.com

TERMINAL FUNCTIONS

DESCRIPTION

NO.

NAME

Shutdown. The SHDN pin is used to put the TL1963A-xx regulators into a low-power shutdown state. The output

is off when the SHDN pin is pulled low. The SHDN pin can be driven either by 5-V logic or open-collector logic

with a pullup resistor. The pullup resistor is required to supply the pullup current of the open-collector gate,

normally several microamperes, and the SHDN pin current, typically 3 µA. If unused, the SHDN pin must be

connected to V_IN. The device is in the low-power shutdown state if the SHDN pin is not connected.

1

SHDN

Input. Power is supplied to the device through the IN pin. A bypass capacitor is required on this pin if the device

is more than six inches away from the main input filter capacitor. In general, the output impedance of a battery

rises with frequency, so it is advisable to include a bypass capacitor in battery-powered circuits. A bypass

capacitor (ceramic) in the range of 1 µF to 10 µF is sufficient. The TL1963A-xx regulators are designed to

withstand reverse voltages on the IN pin with respect to ground and the OUT pin. In the case of a reverse input,

which can happen if a battery is plugged in backwards, the device acts as if there is a diode in series with its

input. There is no reverse current flow into the regulator, and no reverse voltage appears at the load. The device

protects both itself and the load.

2

IN

Ground. The exposed thermal pad is connected to ground and must be soldered to the PCB for rated thermal

performance.

3

4

GND

OUT

Output. The output supplies power to the load. A minimum output capacitor (ceramic) of 10 µF is required to

prevent oscillations. Larger output capacitors are required for applications with large transient loads to limit peak

voltage transients.

Adjust. For the adjustable TL1963A, this is the input to the error amplifier. This pin is internally clamped to ±7 V.

It has a bias current of 3 µA that flows into the pin. The ADJ pin voltage is 1.21 V referenced to ground, and the

output voltage range is 1.21 V to 20 V.

5

ADJ

Sense. For fixed voltage versions of the TL1963A-xx (TL1963A-1.5, TL1963A-1.8, TL1963A-2.5, and

TL1963A-3.3), the SENSE pin is the input to the error amplifier. Optimum regulation is obtained at the point

where the SENSE pin is connected to the OUT pin of the regulator. In critical applications, small voltage drops

are caused by the resistance (R_P) of PC traces between the regulator and the load. These may be eliminated by

connecting the SENSE pin to the output at the load as shown in Figure 32. Note that the voltage drop across the

external PC traces adds to the dropout voltage of the regulator. The SENSE pin bias current is 600 µA at the

rated output voltage. The SENSE pin can be pulled below ground (as in a dual supply system in which the

regulator load is returned to a negative supply) and still allow the device to start and operate.

5

SENSE

2

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ABSOLUTE MAXIMUM RATINGS⁽¹⁾

over operating free-air temperature range (unless otherwise noted)

IN

–20 V to 20 V

–7 V to 7 V

OUT

Input-to-output differential⁽²⁾

V_IN

Input voltage range

SENSE

ADJ

SHDN

–20 V to 20 V

Indefinite

t_short

T_lead

T_J

Output short-circuit duration

Maximum lead temperature

10-second soldering time

300°C

Operating virtual-junction temperature range

Storage temperature range

–40°C to 125°C

–65°C to 150°C

T_stg

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating

conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) Absolute maximum input-to-output differential voltage cannot be achieved with all combinations of rated IN pin and OUT pin voltages.

With the IN pin at 20 V, the OUT pin may not be pulled below 0 V. The total measured voltage from IN to OUT cannot exceed ±20 V.

PACKAGE THERMAL DATA⁽¹⁾

(2)

PACKAGE

BOARD

θ_JA

θ_JC

θ_JP

TO-263 (KTT)

High K, JESD 51-5

26.5°C/W

31.8°C/W

0.38°C/W

(1) Maximum power dissipation is a function of T_J(max), θ_JA, and T_A. The maximum allowable power dissipation at any allowable ambient

temperature is P_D= (T_J(max) – T_A)/θ_JA. Operating at the absolute maximum T_Jof 150°C can affect reliability.

(2) For packages with exposed thermal pads, such as QFN, PowerPAD™, and PowerFLEX™, θ_JPis defined as the thermal resistance

between the die junction and the bottom of the exposed pad.

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TL1963A-xx

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ELECTRICAL CHARACTERISTICS⁽¹⁾

Over operating temperature range T_J= –40°C to 125°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

T_J

25°C

MIN TYP⁽²⁾MAX UNIT

I_LOAD= 0.5 A

I_LOAD= 1.5 A

1.9

2.1

V_IN

Minimum input voltage⁽³⁾⁽⁴⁾

V

Full range

25°C

2.5

V_IN= 2.21 V, I_LOAD= 1 mA

1.477

1.447

1.773

1.737

2.462

2.412

3.250

3.200

1.192

1.174

1.500 1.523

1.500 1.545

1.800 1.827

1.800 1.854

2.500 2.538

2.500 2.575

3.300 3.350

3.300 3.400

1.21 1.228

1.21 1.246

TL1963A-1.5

TL1963A-1.8

TL1963A-2.5

TL1963A-3.3

TL1963A

V_IN= 2.5 V to 20 V,

I_LOAD= 1 mA to 1.5 A

Full range

25°C

V_IN= 2.3 V, I_LOAD= 1 mA

V_IN= 2.8 V to 20 V,

I_LOAD= 1 mA to 1.5 A

Full range

25°C

V_OUT

Regulated output voltage⁽⁵⁾

V

V_IN= 3 V, I_LOAD= 1 mA

V_IN= 3.5 V to 20 V,

I_LOAD= 1 mA to 1.5 A

Full range

25°C

V_IN= 3.8 V, I_LOAD= 1 mA

V_IN= 4.3 V to 20 V,

I_LOAD= 1 mA to 1.5 A

Full range

25°C

V_IN= 2.21 V, I_LOAD= 1 mA

V_ADJ

ADJ pin voltage⁽³⁾⁽⁵⁾

V

V_IN= 2.5 V to 20 V,

I_LOAD= 1 mA to 1.5 A

Full range

ΔV_IN= 2.21 V to 20 V,

I_LOAD= 1 mA

TL1963A-1.5

TL1963A-1.8

TL1963A-2.5

TL1963A-3.3

TL1963A⁽³⁾

Full range

2

2.5

3

6

7

ΔV_IN= 2.3 V to 20 V,

I_LOAD= 1 mA

ΔV_IN= 3 V to 20 V,

I_LOAD= 1 mA

Line regulation

10

5

mV

ΔV_IN= 3.8 V to 20 V,

I_LOAD= 1 mA

3.5

ΔV_IN= 2.21 V to 20 V,

I_LOAD= 1 mA

1.5

2

25°C

Full range

25°C

9

18

10

20

15

30

20

70

8

V_IN= 2.5 V,

ΔI_LOAD= 1 mA to 1.5 A

TL1963A-1.5

TL1963A-1.8

TL1963A-2.5

TL1963A-3.3

TL1963A⁽³⁾

2

2.5

3

V_IN= 2.8 V,

ΔI_LOAD= 1 mA to 1.5 A

Full range

25°C

V_IN= 3.5 V,

ΔI_LOAD= 1 mA to 1.5 A

Load regulation

mV

Full range

25°C

V_IN= 4.3 V,

ΔI_LOAD= 1 mA to 1.5 A

Full range

25°C

2

V_IN= 2.5 V,

ΔI_LOAD= 1 mA to 1.5 A

Full range

18

(1) The TL1963A-xx regulators are tested and specified under pulse load conditions such that T_J≈ T_A. The TL1963A-xx is fully tested at

T_A= 25°C. Performance at –40°C and 125°C is specified by design, characterization, and correlation with statistical process controls.

(2) Typical values represent the likely parametric nominal values determined at the time of characterization. Typical values depend on the

application and configuration and may vary over time. Typical values are not ensured on production material.

(3) The TL1963A (adjustable version) is tested and specified for these conditions with the ADJ pin connected to the OUT pin.

(4) For the TL1963A, TL1963A-1.5 and TL1963A-1.8, dropout voltages are limited by the minimum input voltage specification under some

output voltage/load conditions.

(5) Operating conditions are limited by maximum junction temperature. The regulated output voltage specification does not apply for all

possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be

limited. When operating at maximum output current, the input voltage range must be limited.

4

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ELECTRICAL CHARACTERISTICS (continued)

Over operating temperature range T_J= –40°C to 125°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

T_J

MIN TYP⁽²⁾MAX UNIT

25°C

0.02

0.06

0.1

I_LOAD= 1 mA

Full range

25°C

0.1

0.17

0.22

0.27

0.35

0.45

0.55

1.5

I_LOAD= 100 mA

I_LOAD= 500 mA

I_LOAD= 1.5 A

Dropout voltage^(4)(6)(7)

V_IN= V_OUT(NOMINAL)

Full range

25°C

V_DROPOUT

V

0.19

0.34

Full range

25°C

Full range

I_LOAD= 0 mA

I_LOAD= 1 mA

I_LOAD= 100 mA

I_LOAD= 500 mA

I_LOAD= 1.5 A

1

1.1

3.8

15

1.6

GND pin current⁽⁷⁾⁽⁸⁾

V_IN= V_OUT(NOMINAL)+ 1

I_GND

5.5

mA

25

80

120

C_OUT= 10 µF, I_LOAD= 1.5 A,

B_W= 10 Hz to 100 kHz

e_N

Output voltage noise

25°C

40

µV_RMS

µA

I_ADJ

ADJ pin bias current⁽³⁾⁽⁹⁾

25°C

Full range

25°C

3

0.9

10

2

V_OUT= OFF to ON

V_OUT= ON to OFF

V_SHDN= 0 V

Shutdown threshold

SHDN pin current

V

0.25

0.75

0.01

3

1

I_SHDN

µA

V_SHDN= 20 V

25°C

30

Quiescent current in

shutdown

V_IN= 6 V, V_SHDN= 0 V

25°C

0.01

1

µA

V_IN– V_OUT= 1.5 V (avg), V_RIPPLE= 0.5 V_P-P

f_RIPPLE= 120 Hz, I_LOAD= 0.75 A

,

Ripple rejection

Current limit

55

63

2

dB

V_IN= 7 V, V_OUT= 0 V

V_IN= V_OUT(NOMINAL)+ 1

25°C

I_LIMIT

I_IL

A

Full range

1.6

Input reverse leakage

current

V_IN= –20 V, V_OUT= 0 V

Full range

1

mA

TL1963A-1.5

TL1963A-1.8

Reverse output current⁽¹⁰⁾TL1963A-2.5

V_OUT= 1.5 V, V_IN< 1.5 V

V_OUT= 1.8 V, V_IN< 1.8 V

V_OUT= 2.5 V, V_IN< 2.5 V

V_OUT= 3.3 V, V_IN< 3.3 V

25°C

600 1200

I_RO

µA

TL1963A-3.3

TL1963A

V_OUT= 1.21 V, V_IN< 1.21 V

300

600

(6) Dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specified output current. In

dropout, the output voltage is equal to: V_IN– V_DROPOUT

.

(7) To satisfy requirements for minimum input voltage, the TL1963A (adjustable version) is tested and specified for these conditions with an

external resistor divider (two 4.12-kΩ resistors) for an output voltage of 2.4 V. The external resistor divider adds a 300-mA DC load on

the output.

(8) GND pin current is tested with V_IN= (V_OUT(NOMINAL)+ 1 V) and a current source load. The GND pin current decreases at higher input

voltages.

(9) ADJ pin bias current flows into the ADJ pin.

(10) Reverse output current is tested with the IN pin grounded and the OUT pin forced to the rated output voltage. This current flows into the

OUT pin and out the GND pin.

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TYPICAL CHARACTERISTICS

DROPOUT VOLTAGE

vs

OUTPUT CURRENT

DROPOUT VOLTAGE

vs

TEMPERATURE

500

450

400

350

300

250

200

150

100

50

480

360

240

120

0

I_OUT= 1.5 A

T_A= 125°C

I_OUT= 0.5 A

T_A= 25°C

I_OUT= 100 mA

I_OUT= 1 mA

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

-50

-25

0

25

50

75

100

125

T

_A– Free-Air Temperature – °C

Output Current – A

Figure 1.

Figure 2.

QUIESCENT CURRENT

vs

OUTPUT VOLTAGE

vs

TEMPERATURE

1.5

1.4

1.3

1.2

1.1

1

1.84

1.83

1.82

1.81

1.8

V_IN= 6 V

V_OUTFixed 1.8 V

TL1963A-1.8

I = 1 mA

I_O_O_U_U_T_T= 1 mA

I_OUT= 0 A

V_SHDN= V_IN

V Fixed 3.3 V

TL1963A-3.3

OUT

0.9

0.8

0.7

0.6

0.5

1.79

1.78

1.77

1.76

V Adjustable

TL1963A (Adjustable)

OUT

-50

-25

0

25

50

75

100

125

-50

-25

0

25

50

75

100

125

T_A– Free-Air Temperature – °C

Figure 3.

Figure 4.

6

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TYPICAL CHARACTERISTICS (continued)

OUTPUT VOLTAGE

vs

TEMPERATURE

OUTPUT VOLTAGE

vs

TEMPERATURE

2.58

2.56

2.54

2.52

2.5

3.38

3.36

3.34

3.32

3.3

V

Fixed 2.5 V

TL1963A-2.5

I_OUT= 1 mA

OUT

V_OUTFixed 3.3 V

TL1963A-3.3

I = 1 mA

I_O_O_U_U_T_T= 1 mA

I_OUT= 1 mA

3.28

3.26

3.24

3.22

2.48

2.46

2.44

2.42

-50

-25

0

25

50

75

100

125

-50

-25

0

25

50

75

100

125

T_A– Free-Air Temperature – °C

Figure 5.

Figure 6.

OUTPUT VOLTAGE

vs

TEMPERATURE

QUIESCENT CURRENT

vs

INPUT VOLTAGE

1.23

1.2

1

T_J= 25°C

R_OUT= 4.3 kW

_SHDN= V_IN

Adjustable

V

Adjustable

T^OL^U1^T963A (Adjustable)

1.225

1.22

I

= 1 mA

I^OUT= 1 mA

OUT

V

V = 6 V

V_I_I_N_N= 6 V

V

OUT

TL1963A (Adjustable)

0.8

0.6

0.4

0.2

0

1.215

1.21

1.205

1.2

1.195

1.19

-50

-25

0

25

50

75

100

125

0

2

4

6

8

10 12 14 16

18 20

T_A– Free-Air Temperature – °C

Input Voltage – V

Figure 7.

Figure 8.

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TYPICAL CHARACTERISTICS (continued)

GROUND CURRENT

vs

INPUT VOLTAGE

GROUND CURRENT

vs

INPUT VOLTAGE

100

90

80

70

60

50

40

30

20

10

0

10

8

T_J= 25°C

V_SHDN= V_IN

TL1963A (Adjustable)

V_OUTAdjustable

TL1963A (Adjustable)

V_OUTAdjustable

V_OUT= 1.21 V

6

I_OUT= 1.5 A

I_OUT= 300 mA

4

I_OUT= 1 A

I_OUT= 100 mA

2

I_OUT= 0.5 A

I_OUT= 10 mA

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

Input Voltage – V

Figure 9.

Figure 10.

GROUND CURRENT

vs

INPUT VOLTAGE

GROUND CURRENT

vs

INPUT VOLTAGE

40

35

30

25

20

15

10

5

120

100

80

60

40

20

0

T_J= 25°C

_SHDN= V_IN

V_SHDN= V_IN

V

Fixed 3.3 V

TL1963A-3.3

OUT

TVL19F63ixAe-d3.33.3 V

OUT

I_OUT= 300 mA

I_OUT= 100 mA

I_OUT= 1.5 A

I_OUT= 10 mA

I_OUT= 1 A

I_OUT= 0.5 A

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

Input Voltage – V

Figure 11.

Figure 12.

8

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TYPICAL CHARACTERISTICS (continued)

GROUND CURRENT

vs

OUTPUT CURRENT

SHDN INPUT CURRENT

vs

TEMPERATURE

1

0.75

0.5

80

70

60

50

40

30

20

10

0

V_IN= V_OUT(nom) + 1

V_SHDN= 0 V

0.25

0

-50

-25

0

25

50

75

100

125

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

T_A– Free-Air Temperature – °C

Output Current – A

Figure 13.

Figure 14.

SHDN INPUT CURRENT

vs

SHDN INPUT VOLTAGE

SHDN THRESHOLD (OFF TO ON)

vs

TEMPERATURE

2.5

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

I_OUT= 1 mA

2.25

2

1.75

1.5

1.25

1

0.75

0.5

0.25

0

2

4

6

8

10 12 14 16 18 20

-50

-25

0

25

50

75

100

125

T_A– Free-Air Temperature – °C

SHDN Input Voltage – V

Figure 15.

Figure 16.

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TYPICAL CHARACTERISTICS (continued)

SHDN THRESHOLD (ON TO OFF)

ADJ BIAS CURRENT

vs

TEMPERATURE

vs

TEMPERATURE

5

4.5

4

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

I_OUT= 1 mA

3.5

3

2.5

2

1.5

1

0.5

0

-50

-25

0

25

50

75

100

125

-50

-25

0

25

50

75

100

125

T_A– Free-Air Temperature – °C

Figure 17.

Figure 18.

CURRENT LIMIT

vs

INPUT/OUTPUT DIFFERENTIAL VOLTAGE

CURRENT LIMIT

vs

TEMPERATURE

3.5

3

5

DV_OUT= 100 mV

?

V_IN= 7 V

V_OUT= 0 V

T_A= -40°C

T_A= 25°C

4

3

2

1

0

2.5

2

T_A= 125°C

1.5

1

0.5

0

2

4

6

8

10 12

14

16 18

20

-50

-25

0

25

50

75

T_A– Free-Air Temperature – °C

100

125

Input/Output Differential Voltage – V

Figure 19.

Figure 20.

10

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TYPICAL CHARACTERISTICS (continued)

REVERSE OUTPUT CURRENT

vs

OUTPUT VOLTAGE

TEMPERATURE

12

10

8

1000

800

600

400

200

0

T_J= 25°C

V_IN= 0 V

Current flows into OUT pin

V_OUTAdjustable

TL1963A (Adjustable)

V_OUT= V_ADJ

6

V Fixed 3.3V

TL1963A-3.3

OUT

V_OUT= 3.3 V

4

2

V_OUTAdjustable

TL1963A (Adjustable)

V = 1.21 V

V_O_OU_U_T_T= 1.21 V

0

V Fixed 3.3 V

TL1963A-3.3

OUT

V_OUT= V_FB

-2

0

2

4

6

8

10

-50

-25

0

25

50

75

100

125

Output Voltage – V

T_A– Free-Air Temperature – °C

Figure 21.

Figure 22.

RIPPLE REJECTION

vs

LOAD REGULATION

vs

TEMPERATURE

FREQUENCY

80

20

15

10

5

I_OUT= 1.5 A

70

60

50

40

30

20

10

0

TL1963A (Adjustable)

V_OUTAdjustable

0

-5

-10

-15

-20

-25

-30

-35

TL1963A-1.8

V_OUTFixed 1.8 V

V_IN= 2.7 V

C_IN= 0

TL1963A-2.5

V_OUTFixed 2.5 V

C_IN= 0

C_OUT= 10 µF (ceramic)

C_OUT= 10 µF

I_OUT= 750 mA

TL1963A-3.3

V_OUTFixed 3.3 V

I

_OUT= 750 mA

V_Ripple= 0.05 V

V_Ripple= 0.05^PPV_pp

T_A= 25°C

1100

110000

1010k0

101000k0

10100000k0 10010M00

-50

-25

0

25

50

75

100

125

T_A– Free-Air Temperature – °C

Frequency – Hz

Figure 23.

Figure 24.

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11

TL1963A-xx

SLVS719A–JUNE 2008–REVISED AUGUST 2008 ........................................................................................................................................................ www.ti.com

TYPICAL CHARACTERISTICS (continued)

OUTPUT NOISE VOLTAGE

vs

FREQUENCY

LOAD TRANSIENT RESPONSE

1

V_IN= 4.3 V

C

= 10 µF

C_OUT= 10 µF (ceramic)

C = 10 µF

C_I_I_N_N= 10 µF

OUT

I_OUT= 1.5 A

C_OUT= 10 µF (ceramic)

I

_OUT= 1.5 A

C

_OUT= 10 µF

20 mV

0 mV

V_OUT

TL1963A-3.3

V_OUTFixed 3.3 V

-20 mV

0.1

500 mA

10 mA

TL1963A (Adjustable)

V_OUTAdjustable

I_OUT

0.01

500 µs per division

10

100k

100

1k

Frequency - Hz

10k

Figure 25.

Figure 26.

LOAD TRANSIENT RESPONSE

V_IN= 4.3 V

C

= 10 µF

_IN= 10 µF

C

IN

C_OUT= 10 µF (ceramic)

C

_OUT= 10 µF

V_OUT

20 mV

0 mV

-20 mV

1.5 A

I_OUT

10 mA

500 µs per division

Figure 27.

12

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TYPICAL CHARACTERISTICS (continued)

LINE TRANSIENT RESPONSE

I_{O=UT1.5 A}

= 1.5 A

= 10 µF

I_OUT

C

IN

_IN= 10 µF

C_OUT= 10 µF (ceramic)

C_OUT= 10 µF

5.3 V

V_IN

4.3 V

5 mV

-5 mV

V_OUT

Figure 28.

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13

TL1963A-xx

SLVS719A–JUNE 2008–REVISED AUGUST 2008 ........................................................................................................................................................ www.ti.com

APPLICATION INFORMATION

The TL1963A-xx series are 1.5-A LDO regulators optimized for fast transient response. The devices are capable

of supplying 1.5 A at a dropout voltage of 340 mV. The low operating quiescent current (1 mA) drops to less

than 1 µA in shutdown. In addition to the low quiescent current, the TL1963A-xx regulators incorporate several

protection features which make them ideal for use in battery-powered systems. The devices are protected

against both reverse input and reverse output voltages. In battery-backup applications where the output can be

held up by a backup battery when the input is pulled to ground, the TL1963A-xx acts as if it has a diode in series

with its output and prevents reverse current flow. Additionally, in dual-supply applications where the regulator

load is returned to a negative supply, the output can be pulled below ground by as much as 20 V and still allow

the device to start and operate.

Typical Applications

2.5 V at 1.5 A

IN

OUT

10 µF

(ceramic)

10 µF

(ceramic)

TL1963A-2.5

V

IN

> 3 V

SENSE

GND

SHDN

Figure 29. 3.3 V to 2.5 V Regulator

R5

0.01k

TL1963A-1.8

OUT

IN

LOAD

+

R1

1k

C1

10 µF

SHDN SENSE

GND

V_IN> 2.7 V

R2

80.6k

R4 R6

2.2k 2.2k

R8

100k

C3

1 µF

R3

2k

R7

470k

+

-

C2

3.3 µF

NOTE: All capacitors are ceramic.

Figure 30. Adjustable Current Source

14

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R1

0.01k

IN

3.3 V at 3 A

OUT

TL1963A-3.3

C2

22 µF

V_IN> 3.7 V

C1

10 µF

SHDN SENSE

GND

R2

0.01k

IN

OUT

R6

6.65k

TL1963A

SHDN SENSE

GND

SHDN

R7

4.12k

R3

2.2k

R4

2.2k

R5

1k

+

–

C3

0.01 µF

NOTE: All capacitors are ceramic.

Figure 31. Paralleling Regulators for Higher Output Current

R

P

IN

OUT

TL1963A

SENSE

GND

SHDN

V

IN

Load

R

P

Figure 32. Kelvin Sense Connection

Adjustable Operation

The adjustable version of the TL1963A has an output voltage range of 1.21 V to 20 V. The output voltage is set

by the ratio of two external resistors as shown in Figure 33. The device maintains the voltage at the ADJ pin at

1.21 V referenced to ground. The current in R1 is then equal to 1.21 V / R1, and the current in R2 is the current

in R1 plus the ADJ pin bias current. The ADJ pin bias current, 3 µA at 25°C, flows through R2 into the ADJ pin.

The output voltage can be calculated using the formula shown in Figure 33. The value of R1 should be less than

4.17 kΩ to minimize errors in the output voltage caused by the ADJ pin bias current. Note that in shutdown the

output is turned off, and the divider current is zero.

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TL1963A-xx

SLVS719A–JUNE 2008–REVISED AUGUST 2008 ........................................................................................................................................................ www.ti.com

V

OUT

IN

OUT

TL1963A

ADJ

R

2

V

IN

R

1

GND

R2

R1

+

(I_ADJ)(R2)

+

V_OUT= 1.21 V 1

)

V_ADJ= 1.21 V

I_ADJ= 3 µA at 25°C

Output range = 1.21 V to 20 V

Figure 33. Adjustable Operation

The adjustable device is tested and specified with the ADJ pin tied to the OUT pin for an output voltage of

1.21 V. Specifications for output voltages greater than 1.21 V are proportional to the ratio of the desired output

voltage to 1.21 V: V_OUT/1.21 V. For example, load regulation for an output current change of 1 mA to 1.5 A is

–3 mV (typ) at V_OUT= 1.21 V. At V_OUT= 5 V, load regulation is:

(5 V/1.21 V)(–3 mV) = –12.4 mV

Output Capacitance and Transient Response

The TL1963A-xx regulators are designed to be stable with a wide range of output capacitors. The ESR of the

output capacitor affects stability, most notably with small capacitors. A minimum output capacitor of 10 µF with

an ESR of 3 Ω or less is recommended to prevent oscillations. Larger values of output capacitance can decrease

the peak deviations and provide improved transient response for larger load current changes. Bypass capacitors,

used to decouple individual components powered by the TL1963A-xx, increase the effective output capacitor

value.

Extra consideration must be given to the use of ceramic capacitors. Ceramic capacitors are manufactured with a

variety of dielectrics, each with different behavior over temperature and applied voltage. The most common

dielectrics used are Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics are good for providing high

capacitances in a small package, but exhibit strong voltage and temperature coefficients. When used with a 5-V

regulator, a 10-µF Y5V capacitor can exhibit an effective value as low as 1 µF to 2 µF over the operating

temperature range. The X5R and X7R dielectrics result in more stable characteristics and are more suitable for

use as the output capacitor. The X7R type has better stability across temperature, while the X5R is less

expensive and is available in higher values.

Voltage and temperature coefficients are not the only sources of problems. Some ceramic capacitors have a

piezoelectric response. A piezoelectric device generates voltage across its terminals due to mechanical stress,

similar to the way a piezoelectric accelerometer or microphone works. For a ceramic capacitor the stress can be

induced by vibrations in the system or thermal transients.

Overload Recovery

Like many IC power regulators, the TL1963A-xx has safe operating area protection. The safe area protection

decreases the current limit as input-to-output voltage increases and keeps the power transistor inside a safe

operating region for all values of input-to-output voltage. The protection is designed to provide some output

current at all values of input-to-output voltage up to the device breakdown.

When power is first turned on, as the input voltage rises, the output follows the input, allowing the regulator to

start up into very heavy loads. During start up, as the input voltage is rising, the input-to-output voltage

differential is small, allowing the regulator to supply large output currents. With a high input voltage, a problem

can occur wherein removal of an output short does not allow the output voltage to recover. Other regulators also

exhibit this phenomenon, so it is not unique to the TL1963A-xx.

16

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The problem occurs with a heavy output load when the input voltage is high and the output voltage is low.

Common situations are immediately after the removal of a short circuit or when the shutdown pin is pulled high

after the input voltage has already been turned on. The load line for such a load may intersect the output current

curve at two points. If this happens, there are two stable output operating points for the regulator. With this

double intersection, the input power supply may need to be cycled down to zero and brought up again to make

the output recover.

Output Voltage Noise

The TL1963A-xx regulators have been designed to provide low output voltage noise over the 10-Hz to 100-kHz

bandwidth while operating at full load. Output voltage noise is typically 40 nV/√Hz over this frequency bandwidth

for the TL1963A (adjustable version). For higher output voltages (generated by using a resistor divider), the

output voltage noise is gained up accordingly. This results in RMS noise over the 10-Hz to 100-kHz bandwidth of

14 µV_RMSfor the TL1963A, increasing to 38 µV_RMSfor the TL1963A-3.3.

Higher values of output voltage noise may be measured when care is not exercised with regards to circuit layout

and testing. Crosstalk from nearby traces can induce unwanted noise onto the output of the TL1963A-xx.

Power-supply ripple rejection must also be considered; the TL1963A-xx regulators do not have unlimited

power-supply rejection and pass a small portion of the input noise through to the output.

Thermal Considerations

The power handling capability of the device is limited by the maximum rated junction temperature (125°C). The

power dissipated by the device is made up of two components:

1. Output current multiplied by the input/output voltage differential: I_OUT(V_IN– V_OUT

2. GND pin current multiplied by the input voltage: I_GNDV_IN.

)

The GND pin current can be found using the GND Pin Current graphs in Typical Characteristics. Power

dissipation is equal to the sum of the two components listed above.

The TL1963A-xx series regulators have internal thermal limiting designed to protect the device during overload

conditions. For continuous normal conditions, the maximum junction temperature rating of 125°C must not be

exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to

ambient. Additional heat sources mounted nearby must also be considered.

For surface-mount devices, heat sinking is accomplished by using the heat-spreading capabilities of the PC

board and its copper traces. Copper board stiffeners and plated through-holes also can be used to spread the

heat generated by power devices.

Table 1 lists thermal resistance for several different board sizes and copper areas. All measurements were taken

in still air on 1/16-inch FR-4 board with one-ounce copper.

Table 1. KTT Package (5-Pin TO-263)

COPPER AREA

TOPSIDE⁽¹⁾

2500 mm²

1000 mm²

125 mm²

THERMAL RESISTANCE

(JUNCTION TO AMBIENT)

BOARD AREA

BACKSIDE

2500 mm²

23°C/W

25°C/W

33°C/W

(1) Device is mounted on topside.

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17

TL1963A-xx

SLVS719A–JUNE 2008–REVISED AUGUST 2008 ........................................................................................................................................................ www.ti.com

Calculating Junction Temperature

Example: Given an output voltage of 3.3 V, an input voltage range of 4 V to 6 V, an output current range of 0 mA

to 500 mA, and a maximum ambient temperature of 50°C, what is the maximum junction temperature?

The power dissipated by the device is equal to:

I_OUT(MAX)(V_IN(MAX)– V_OUT) + I_GND(V_IN(MAX)

)

where,

I_OUT(MAX)= 500 mA

V_IN(MAX)= 6 V

I_GNDat (I_OUT= 500 mA, V_IN= 6 V) = 10 mA

So,

P = 500 mA (6 V – 3.3 V) + 10 mA (6 V) = 1.41 W

Using a KTT package, the thermal resistance is in the range of 23°C/W to 33°C/W, depending on the copper

area. So the junction temperature rise above ambient is approximately equal to:

1.41 W × 28°C/W = 39.5°C

The maximum junction temperature is then be equal to the maximum junction-temperature rise above ambient

plus the maximum ambient temperature or:

T_JMAX= 50°C + 39.5°C = 89.5°C

Protection Features

The TL1963A-xx regulators incorporate several protection features that make them ideal for use in

battery-powered circuits. In addition to the normal protection features associated with monolithic regulators, such

as current limiting and thermal limiting, the devices are protected against reverse input voltages, reverse output

voltages and reverse voltages from output to input.

Current limit protection and thermal overload protection are intended to protect the device against current

overload conditions at the output of the device. For normal operation, the junction temperature should not exceed

125°C.

The input of the device withstands reverse voltages of 20 V. Current flow into the device is limited to less than

1 mA (typically less than 100 µA), and no negative voltage appears at the output. The device protects both itself

and the load. This provides protection against batteries that can be plugged in backward.

The output of the TL1963A-xx can be pulled below ground without damaging the device. If the input is left open

circuit or grounded, the output can be pulled below ground by 20 V. For fixed voltage versions, the output acts

like a large resistor, typically 5 kΩ or higher, limiting current flow to typically less than 600 µA. For adjustable

versions, the output acts like an open circuit; no current flows out of the pin. If the input is powered by a voltage

source, the output sources the short-circuit current of the device and protects itself by thermal limiting. In this

case, grounding the SHDN pin turns off the device and stops the output from sourcing the short-circuit current.

The ADJ pin of the adjustable device can be pulled above or below ground by as much as 7 V without damaging

the device. If the input is left open circuit or grounded, the ADJ pin acts like an open circuit when pulled below

ground and like a large resistor (typically 5 kΩ) in series with a diode when pulled above ground.

In situations where the ADJ pin is connected to a resistor divider that would pull the ADJ pin above its 7-V clamp

voltage if the output is pulled high, the ADJ pin input current must be limited to less than 5 mA. For example, a

resistor divider is used to provide a regulated 1.5-V output from the 1.21-V reference when the output is forced to

20 V. The top resistor of the resistor divider must be chosen to limit the current into the ADJ pin to less than

5 mA when the ADJ pin is at 7 V. The 13-V difference between OUT and ADJ pins divided by the 5-mA

maximum current into the ADJ pin yields a minimum top resistor value of 2.6 kΩ.

In circuits where a backup battery is required, several different input/output conditions can occur. The output

voltage may be held up while the input is either pulled to ground, pulled to some intermediate voltage, or is left

open circuit.

18

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TL1963A-xx

www.ti.com ........................................................................................................................................................ SLVS719A–JUNE 2008–REVISED AUGUST 2008

When the IN pin of the TL1963A-xx is forced below the OUT pin or the OUT pin is pulled above the IN pin, input

current typically drops to less than 2 µA. This can happen if the input of the device is connected to a discharged

(low voltage) battery and the output is held up by either a backup battery or a second regulator circuit. The state

of the SHDN pin has no effect on the reverse output current when the output is pulled above the input.

Submit Documentation Feedback

19

PACKAGE OPTION ADDENDUM

www.ti.com

25-Sep-2008

PACKAGING INFORMATION

Orderable Device

TL1963A-15KTTR

TL1963A-15KTTRG3

TL1963A-15KTTT

TL1963A-18KTTR

TL1963A-18KTTRG3

TL1963A-18KTTT

TL1963A-25KTTR

TL1963A-25KTTRG3

TL1963A-25KTTT

TL1963A-33KTTR

TL1963A-33KTTT

TL1963AKTTR

Status ⁽¹⁾

ACTIVE

PREVIEW

ACTIVE

PREVIEW

ACTIVE

PREVIEW

ACTIVE

PREVIEW

ACTIVE

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

Drawing

DDPAK/

TO-263

KTT

5

500 Green (RoHS &

no Sb/Br)

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Call TI

CU SN

Level-3-245C-168 HR

Call TI

DDPAK/

TO-263

KTT

500 Green (RoHS &

no Sb/Br)

DDPAK/

TO-263

TBD

DDPAK/

TO-263

500 Green (RoHS &

no Sb/Br)

Level-3-245C-168 HR

Call TI

DDPAK/

TO-263

500 Green (RoHS &

no Sb/Br)

DDPAK/

TO-263

TBD

DDPAK/

TO-263

500 Green (RoHS &

no Sb/Br)

Level-3-245C-168 HR

Call TI

DDPAK/

TO-263

500 Green (RoHS &

no Sb/Br)

DDPAK/

TO-263

TBD

DDPAK/

TO-263

500 Green (RoHS &

no Sb/Br)

Level-3-245C-168 HR

Call TI

DDPAK/

TO-263

TBD

DDPAK/

TO-263

500 Green (RoHS &

no Sb/Br)

Level-3-245C-168 HR

TL1963AKTTRG3

DDPAK/

TO-263

500 Green (RoHS &

no Sb/Br)

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and

package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS

compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

25-Sep-2008

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 2

PACKAGE MATERIALS INFORMATION

www.ti.com

23-Jul-2008

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device

Package Package Pins

Type Drawing

SPQ

Reel

A0 (mm)

B0 (mm)

K0 (mm)

P1

W

Pin1

Diameter Width

(mm) W1 (mm)

(mm) (mm) Quadrant

TL1963A-15KTTR

TL1963A-18KTTR

TL1963A-25KTTR

TL1963A-33KTTR

TL1963AKTTR

DDPAK/

TO-263

KTT

5

500

330.0

24.4

10.6

15.8

4.9

16.0

24.0

Q2

DDPAK/

TO-263

DDPAK/

TO-263

DDPAK/

TO-263

DDPAK/

TO-263

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

23-Jul-2008

*All dimensions are nominal

Device

Package Type Package Drawing Pins

SPQ

Length (mm) Width (mm) Height (mm)

TL1963A-15KTTR

TL1963A-18KTTR

TL1963A-25KTTR

TL1963A-33KTTR

TL1963AKTTR

DDPAK/TO-263

KTT

5

500

340.0

38.0

Pack Materials-Page 2

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型号：	TL1963A-15
厂家：	TEXAS INSTRUMENTS
描述：	1.5-A LOW-NOISE FAST-TRANSIENT-RESPONSE LOW-DROPOUT REGULATOR 1.5低噪声快速瞬态响应低压降稳压器稳压器
文件：	总26页 (文件大小：806K)
中文：	中文翻译
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TL1963A-15 [TI]

相关型号：

TL1963A-15DCQR

TL1963A-15DCQT

TL1963A-15DCYR

TL1963A-15DCYT

TL1963A-15KTTR

TL1963A-15KTTRG3

TL1963A-15KTTT

TL1963A-15QKTTRQ1

TL1963A-18

TL1963A-18DCQR

TL1963A-18DCQT

TL1963A-18DCYR