REG

102

REG102

REG

102

SBVS024F – NOVEMBER 2000 – REVISED SEPTEMBER 2005

DMOS

250mA Low-Dropout Regulator

FEATURES

q

NEW DMOS TOPOLOGY:

Ultra Low Dropout Voltage:

150mV typ at 250mA

Output Capacitor

not

Required for Stability

q

FAST TRANSIENT RESPONSE

q

VERY LOW NOISE: 28

µ

Vrms

q

HIGH ACCURACY:

±

1.5% max

q

HIGH EFFICIENCY:

I

GND

= 600

µ

A at I

OUT

= 250mA

Not Enabled: I

GND

= 0.01

µ

A

q

2.5V, 2.8V, 2.85V, 3.0V, 3.3V, AND 5.0V

ADJUSTABLE OUTPUT VERSIONS

q

OTHER OUTPUT VOLTAGES AVAILABLE UPON

REQUEST

q

FOLDBACK CURRENT LIMIT

q

THERMAL PROTECTION

q

SMALL SURFACE-MOUNT PACKAGES:

SOT23-5, SOT223-5, and SO-8

DESCRIPTION

The REG102 is a family of low-noise, low-dropout linear

regulators with low ground pin current. The new DMOS

topology provides significant improvement over previous

designs, including low-dropout voltage (only 150mV typ at

full load), and better transient performance. In addition, no

output capacitor is required for stability, unlike conventional

low-dropout regulators that are difficult to compensate and

require expensive low ESR capacitors greater than 1µF.

Typical ground pin current is only 600µA (at I

OUT

= 250mA)

and drops to 10nA when not enabled. Unlike regulators with

PNP pass devices, quiescent current remains relatively con-

stant over load variations and under dropout conditions.

The REG102 has very low output noise (typically 28µVrms

for V

OUT

= 3.3V with C

NR

= 0.01µF), making it ideal for use

in portable communications equipment. On-chip trimming

results in high output voltage accuracy. Accuracy is main-

tained over temperature, line, and load variations. Key pa-

rameters are tested over the specified temperature range

(–40°C to +85°C).

The REG102 is well protected—internal circuitry provides a

current limit that protects the load from damage; furthermore,

thermal protection circuitry keeps the chip from being dam-

aged by excessive temperature. The REG102 is available in

SOT23-5, SOT223-5, and SO-8 packages.

APPLICATIONS

q

PORTABLE COMMUNICATION DEVICES

BATTERY-POWERED EQUIPMENT

PERSONAL DIGITAL ASSISTANTS

MODEMS

BAR-CODE SCANNERS

BACKUP POWER SUPPLIES

Enable

V

IN

+

0.1µF

REG102

(Fixed Voltage

Versions)

GND

+

V

OUT

C

OUT(1)

V

IN

Enable

V

OUT

+

0.1µF

REG102-A

R

1

Adj

GND

NOTE: (1) Optional.

R

2

+

C

OUT(1)

NR

NR = Noise Reduction

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.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is 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.

www.ti.com

ABSOLUTE MAXIMUM RATINGS

(1)

Supply Input Voltage, V

IN

....................................................... –0.3V to 12V

Enable Input Voltage, V

EN

....................................................... –0.3V to V

IN

Feedback Voltage, V

FB

........................................................ –0.3V to 6.0V

NR Pin Voltage, V

NR

............................................................. –0.3V to 6.0V

Output Short-Circuit Duration ...................................................... Indefinite

Operating Temperature Range (T

J

) ................................ –55°C to +125°C

Storage Temperature Range (T

A

) ................................... –65°C to +150°C

Lead Temperature (soldering, 3s) .................................................. +240°C

NOTE: (1) Stresses above these ratings may cause permanent damage.

Exposure to absolute maximum conditions for extended periods may degrade

device reliability.

ELECTROSTATIC

DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas

Instruments recommends that all integrated circuits be handled

with appropriate precautions. Failure to observe proper han-

dling and installation procedures can cause damage.

ESD damage can range from subtle performance degrada-

tion to complete device failure. Precision integrated circuits

may be more susceptible to damage because very small

parametric changes could cause the device not to meet its

published specifications.

PACKAGE/ORDERING INFORMATION

(1)

PRODUCT

REG102xx-

yyyy/zzz

XX

is package designator.

YYYY

is typical output voltage (5 = 5.0V, 2.85 = 2.85V, A = Adjustable).

ZZZ

is package quantity.

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

(2) Output voltages from 2.5V to 5.1V in 50mV increments are available; minimum order quantities apply. Contact factory for details and availability.

V

OUT(2)

PIN CONFIGURATIONS

Top View

SOT23-5

V

IN

GND

Enable

1

2

3

(N Package)

V

IN

V

OUT

GND

Enable

NR/Adjust

(1)

4

NR/Adjust

(1)

1

2

3

4

5

V

OUT

SOT223-5

V

OUT(2)

V

OUT(2)

NR/Adjust

(1)

GND

1

2

3

4

(U Package)

SO-8

8

7

6

5

V

IN(3)

V

IN(3)

NC

Enable

Tab is GND

(G Package)

NOTES: (1) For REG102A-A: voltage setting resistor pin.

All other models: noise reduction capacitor pin.

(2) Both pin 1 and pin 2 must be connected.

(3) Both pin 7 and pin 8 must be connected.

2

REG102

www.ti.com

SBVS024F

ELECTRICAL CHARACTERISTICS

Boldface

limits apply over the specified temperature range,

T

J

= –40

°

C to +85

°

C.

At T

J

= +25°C, V

IN

= V

OUT

+ 1V (V

OUT

= 2.5V for REG102-A), V

ENABLE

= 1.8V, I

OUT

= 5mA, C

NR

= 0.01µF, and C

OUT

= 0.1µF

(1)

, unless otherwise noted.

REG102NA

REG102GA

REG102UA

PARAMETER

OUTPUT VOLTAGE

Output Voltage Range

REG102-2.5

REG102-2.8

REG102-2.85

REG102-3.0

REG102-3.3

REG102-5

REG102-A

Reference Voltage

Adjust Pin Current

Accuracy

Over Temperature

vs Temperature

vs Line and Load

Over Temperature

DC DROPOUT VOLTAGE

(2)

For all models

Over Temperature

VOLTAGE NOISE

f = 10Hz to 100kHz

Without C

NR

(all models)

With C

NR

(all fixed voltage models)

OUTPUT CURRENT

Current Limit

(3)

Over Temperature

Short-Circuit Current Limit

RIPPLE REJECTION

f = 120Hz

ENABLE CONTROL

V

ENABLE

High (output enabled)

V

ENABLE

Low (output disabled)

I

ENABLE

High (output enabled)

I

ENABLE

Low (output disabled)

Output Disable Time

Output Enable Softstart Time

THERMAL SHUTDOWN

Junction Temperature

Shutdown

Reset from Shutdown

GROUND PIN CURRENT

Ground Pin Current

Enable Pin Low

INPUT VOLTAGE

Operating Input Voltage Range

(5)

Specified Input Voltage Range

Over Temperature

TEMPERATURE RANGE

Specified Range

Operating Range

Storage Range

Thermal Resistance

SOT23-5 Surface-Mount

SO-8 Surface-Mount

SOT223-5 Surface-Mount

V

IN

V

IN

> 1.8V

V

IN

> 1.8V

T

J

T

J

T

A

1.8

V

OUT

+ 0.4

V

OUT

+ 0.6

–40

–55

–65

Junction-to-Ambient

Junction-to-Case

Junction-to-Ambient

200

150

15

See Figure 8

10

+85

+125

+150

V

°C

°C/W

I

GND

I

OUT

= 5mA

I

OUT

= 250mA

V

ENABLE

≤

0.5V

V

ENABLE

I

ENABLE

V

ENABLE

= 1.8V to V

IN

, V

IN

= 1.8V to 6.5

(4)

V

ENABLE

= 0V to 0.5V

C

OUT

= 1.0µF, R

LOAD

= 13Ω

C

OUT

= 1.0µF, R

LOAD

= 13Ω

1.8

–0.2

1

2

50

1.5

V

OUT

2.5

2.8

2.85

3.0

3.3

5

2.5

V

REF

I

ADJ

dV

OUT

/dT

I

OUT

= 5mA to 250mA, V

IN

= (V

OUT

+ 0.4V) to 10V

V

IN

= (V

OUT

+ 0.6V) to 10V

V

DROP

I

OUT

= 5mA

I

OUT

= 250mA

I

OUT

= 250mA

1.26

0.2

±0.5

50

±0.8

4

150

5.5

1

±1.5

±

2.3

V

µA

%

ppm/°C

%

mV

CONDITION

MIN

TYP

MAX

UNITS

±

2.8

10

220

270

±2.0

V

n

C

NR

= 0, C

OUT

= 0

C

NR

= 0.01µF, C

OUT

= 10µF

I

CL

I

SC

340

300

23µVrms/V • V

OUT

7µVrms/V • V

OUT

400

150

65

V

IN

0.5

100

470

490

µVrms

mA

dB

V

nA

µs

ms

160

140

400

600

0.01

500

800

0.2

°C

µA

θ

JA

θ

JA

θ

JC

θ

JA

NOTES: (1) The REG102 does not require a minimum output capacitor for stability, however, transient response can be improved with proper capacitor selection.

(2) Dropout voltage is defined as the input voltage minus the output voltage that produces a 2% change in the output voltage from the value at V

IN

= V

OUT

+ 1V at fixed load.

(3) Current limit is the output current that produces a 10% change in output voltage from V

IN

= V

OUT

+ 1V and I

OUT

= 5mA.

(4) For V

ENABLE

> 6.5V, see typical characteristic

I

ENABLE

vs V

ENABLE

.

(5) The REG102 no longer regulates when V

IN

< V

OUT

+ V

DROP (MAX)

. In dropout, the impedance from V

IN

to V

OUT

is typically less than 1Ω at T

J

= +25°C.

REG102

SBVS024F

www.ti.com

3

TYPICAL CHARACTERISTICS

For all models, at T

J

= +25°C and V

ENABLE

= 1.8V, unless otherwise noted.

OUTPUT VOLTAGE CHANGE vs I

OUT

(V

IN

= V

OUT

+ 1V, Output Voltage % Change

Referred to I

OUT

= 125mA at +25°C)

0.80

0.60

LOAD REGULATION vs TEMPERATURE

(V

IN

= V

OUT

+ 1V)

0

Output Voltage Change (%)

0.40

+25°C

0.20

0

–0.20

–0.40

–0.60

–0.80

0

25

50

75

100

125

150

175 200

225 250

I

OUT

(mA)

–55°C

+125°C

Output Voltage Change (%)

–0.1

–0.2

–0.3

–0.4

–0.5

–0.6

–0.7

–50

5mA < I

OUT

< 250mA

25mA < I

OUT

< 250mA

–25

0

25

50

75

100

125

Temperature (°C)

LINE REGULATION

(Referred to V

IN

= V

OUT

+ 1V at I

OUT

= 125mA)

20

0

Output Voltage Change (%)

All Fixed Output

Voltage Versions

I

OUT

= 5mA

I

OUT

= 125mA

15

10

5

0

–5

–10

–15

I

OUT

= 250mA

–20

0

1

2

3

4

5

6

7

8

V

IN

– V

OUT

(V)

LINE REGULATION vs TEMPERATURE

I

OUT

= 250mA

–0.05

–0.10

–0.15

–0.20

–0.25

(V

OUT

+ 0.4V) < V

IN

< 10V

–0.30

–50

–25

0

25

50

75

100

125

(V

OUT

+ 1V) < V

IN

< 10V

Output Voltage Change (mV)

Temperature (°C)

DC DROPOUT VOLTAGE vs I

OUT

250

DC DROPOUT VOLTAGE vs TEMPERATURE

I

OUT

= 250mA

DC Dropout Voltage (mV)

200

+125°C

150

+25°C

100

–55°C

50

150

100

50

0

50

100

150

200

250

I

OUT

(mA)

0

–50

–25

0

25

50

75

100

125

Temperature (°C)

4

REG102

www.ti.com

SBVS024F

TYPICAL CHARACTERISTICS

(Cont.)

For all models, at T

J

= +25°C and V

ENABLE

= 1.8V, unless otherwise noted.

OUTPUT VOLTAGE ACCURACY HISTOGRAM

18

16

25

Percentage of Units (%)

30

OUTPUT VOLTAGE DRIFT HISTOGRAM

14

12

10

8

6

4

2

0

–1.0

–0.8

–0.6

–0.4

–0.2

0.0

0.2

0.4

0.6

0.8

1.0

Percentage of Units (%)

20

15

10

5

0

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

V

OUT

Drift (ppm/°C)

GROUND PIN CURRENT, NOT ENABLED

vs TEMPERATURE

1µ

V

ENABLE

= 0.5V

V

IN

= V

OUT

+ 1V

Error (%)

OUTPUT VOLTAGE vs TEMPERATURE

(Output Voltage % Change Refered

to I

OUT

= 125mA at +25°C)

0.80

0.60

Output Voltage Change (%)

0.40

0.20

0

–0.20

–0.40

–0.60

–0.80

–1.00

–50

I

OUT

= 125mA

I

OUT

= 5mA

I

GND

(A)

100n

10n

I

OUT

= 250mA

1n

–25

0

25

50

75

100

125

100p

–50

–25

0

25

50

75

100

125

Temperature (°C)

GROUND PIN CURRENT vs I

OUT

800

700

600

I

GND

(µA)

GROUND PIN CURRENT vs TEMPERATURE

750

725

V

OUT

= 5V

I

OUT

= 250mA

V

OUT

= 5.0V

700

I

GND

(µA)

675

V

OUT

= 3.3V

650

625

600

575

550

V

OUT

= 2.5V

500

400

300

200

100

0

25

50

75

100

125

150 175 200

225 250

I

OUT

(mA)

V

OUT

= 2.5V

V

OUT

= 3.3V

–50

–25

0

25

50

75

100

125

Temperature (°C)

REG102

SBVS024F

www.ti.com

5

参数名称	属性值
功能数量	1
端子数量	8
最大输出电流	0.2500 A
最大输出电压	5.14 V
最小输出电压	4.86 V
最大输入电压	10 V
最小输入电压	5.27 V
加工封装描述	GREEN, PLASTIC, MS-012AA, SOIC-8
无铅	Yes
欧盟RoHS规范	Yes
中国RoHS规范	Yes
状态	ACTIVE
工艺	NMOS
包装形状	RECTANGULAR
包装尺寸	SMALL OUTLINE
表面贴装	Yes
端子形式	GULL WING
端子间距	1.27 mm
端子涂层	NICKEL PALLADIUM GOLD
端子位置	DUAL
包装材料	PLASTIC/EPOXY
最大电压差	0.2700 V
调节类型	FIXED POSITIVE LDO REGULATOR
额定输出电压	5 V

REG102UA-2.85/2K5

REG102UA-2.85/2K5概述

REG102UA-2.85/2K5规格参数

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