Texas Instruments REG101UA Schematics

REG101

SBVS026D – JULY 2001 – REVISED SEPTEMBER 2005

DMOS

100mA Low-Dropout Regulator

REG101

FEATURES

● NEW DMOS TOPOLOGY:

Ultra Low Dropout Voltage:

60mV typ at 100mA Output capacitor NOT required for stability

● FAST TRANSIENT RESPONSE

●

VERY LOW NOISE:

23µVrms

● HIGH ACCURACY: ±1.5% max

● HIGH EFFICIENCY:

I

= 500µA at I

GND

Not Enabled: I

OUT

GND

= 10nA

= 100mA

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

ADJUSTABLE OUTPUT VERSIONS

● OTHER OUTPUT VOLTAGES AVAILABLE

UPON REQUEST

● FOLDBACK CURRENT LIMIT

● THERMAL PROTECTION

● SMALL SURFACE-MOUNT PACKAGES:

SOT23-5 and SO-8

APPLICATIONS

DESCRIPTION

The REG101 is a family of low-noise, low-dropout linear regulators with low ground pin current. Its new DMOS topology provides significant improvement over previous designs, including low dropout voltage (only 60mV 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 500µA (at I and drops to 10nA when not in enabled mode. Unlike regulators with PNP pass devices, quiescent current remains relatively constant over load variation and under dropout conditions.

The REG101 has very low output noise (typically 23µVrms for V

= 3.3V with CNR = 0.01µF), making it ideal for use

OUT

in portable communications equipment. Accuracy is maintained over temperature, line, and load variations. Key parameters are tested over the specified temperature range (–40°C to +85°C).

The REG101 is well protected—internal circuitry provides a current limit that protects the load from damage. Thermal protection circuitry keeps the chip from being damaged by excessive temperature. The REG101 is available in the SOT23-5 and the SO-8 packages.

= 100mA)

OUT

● PORTABLE COMMUNICATION DEVICES

● BATTERY-POWERED EQUIPMENT

● PERSONAL DIGITAL ASSISTANTS

● MODEMS

● BAR-CODE SCANNERS

● BACKUP POWER SUPPLIES

Enable

V

IN

+

0.1µF

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.

REG101

(Fixed Voltage

Versions)

Gnd

+

C

V

OUT

(1)

OUT

NOTE: (1) Optional.

www.ti.com

Enable

V

IN

+

0.1µF

REG101-A

Gnd

R Adj R

1

2

V

OUT

+

(1)

C

OUT

ABSOLUTE MAXIMUM RATINGS

Supply Input Voltage, VIN.......................................................–0.3V to 12V

Enable Input Voltage, V

Feedback Voltage, VFB........................................................ –0.3V to 6.0V

NR Pin Voltage, V

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

Operating Temperature Range (T Storage Temperature Range (T Lead Temperature

NOTE: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability.

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

EN

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

NR

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

J

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

(soldering, 3s, SOT23-5, and SO-8)

A

(1)

IN

..................... +240°C

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 handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation 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

PRODUCT V

REG101xx-

(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.

yyyy/zzz

(1)

(2)

OUT

XX is package designator. YYYY is typical output voltage (5 = 5.0V, 2.85 = 2.85V, A = Adjustable). ZZZ is package quantity.

PIN CONFIGURATIONS

Top View

V

OUT

V

OUT

NR/Adjust

GND

SO-8

(2)

1

(2)

2

(1)

3

4

(U Package)

8

7

6

5

(3)

V

IN

(3)

V

IN

NC

Enable

V

GND

Enable

IN

1

2

3

(N Package)

SOT23-5

5

4

V

OUT

NR/Adjust

(1)

NOTE: (1) For REG101A-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

REG101

SBVS026D

ELECTRICAL CHARACTERISTICS

Boldface limits apply over the specified temperature range, TJ = –40°C to +85°C.

At TJ = +25°C, VIN = V

OUT

+ 1V (V

= 2.5V for REG101-A), V

OUT

ENABLE

= 1.8V, I

= 2mA, CNR = 0.01µF, and C

OUT

PARAMETER CONDITION MIN TYP MAX UNITS OUTPUT VOLTAGE

Output Voltage V

OUT

REG101-2.5 2.5 V REG101-2.8 2.8 V REG101-2.85 2.85 V REG101-3.0 3.0 V REG101-3.3 3.3 V REG101-5 5V REG101-A 2.5 5.5 V

Reference Voltage V Adjust Pin Current I

REF

ADJ

Accuracy ±0.5 ±1.5 %

Over Temperature vs Temperature dV

Includes Line and Load

Over Temperature V

DC DROPOUT VOLTAGE

(2)

For all models I

Over Temperature I

VOLTAGE NOISE V

Without C With C

NR

(all fixed voltage models) CNR = 0.01µF, C

NR

/dT 50 ppm/°C

OUT

V

DROP

I

= 2mA to 100mA, VIN = (V

OUT

n

+ 0.4V) to 10V

OUT

+ 0.6V) to 10V ±2.7 %

= 2mA 4 10 mV

= 100mA 60 100 mV

= 100mA 130 mV

IN

= (V

OUT

I

OUT

f = 10Hz to 100kHz

CNR = 0, C

= 0 23µVrms/V • V

OUT

= 10µF7µVrms/V • V

OUT

OUTPUT CURRENT

Current Limit

(3)

I

CL

130 170 220 mA

Over Temperature 110 240 mA

Short-Circuit Current I

SC

RIPPLE REJECTION

f = 120Hz I

= 100mA 65 dB

OUT

ENABLE CONTROL

V

High (output enabled) V

ENABLE

V

Low (output disabled) –0.2 0.5 V

ENABLE

I

High (output enabled) I

ENABLE

I

Low (output disabled) V

ENABLE

Output Disable Time C Output Enable Time C

ENABLE

V

= 1.8V to VIN, VIN = 1.8V to 6.5

ENABLE

= 0V to 0.5V 2 100 nA

ENABLE

= 1.0µF, R

OUT

= 1.0µF, R

OUT

(4)

= 33Ω 200 µs

LOAD

= 33Ω 1.5 ms

LOAD

1.8 V

THERMAL SHUTDOWN

Junction Temperature

Shutdown 160 °C Reset from Shutdown 140 °C

GROUND PIN CURRENT

Ground Pin Current I

GND

Enable Pin Low V

INPUT VOLTAGE V Operating Input Voltage Range

(5)

IN

Specified Input Voltage Range V

Over Temperature VIN > 1.8V V

I

= 2mA 400 500 µA

OUT

I

= 100mA 500 650 µA

OUT

≤ 0.5V 0.01 0.2 µA

ENABLE

1.8 10 V

> 1.8V V

IN

+ 0.4 10 V

OUT

+ 0.6 10 V

OUT

TEMPERATURE RANGE

Specified Range T Operating Range T Storage Range T

J J A

–40 +85 °C –55 +125 °C –65 +150 °C

Thermal Resistance

SOT23-5 Surface Mount SO-8 Surface Mount

θ

JA

θ

JA

Junction-to-Ambient 200 °C/W Junction-to-Ambient 150 °C/W

NOTES: (1) The REG101 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

load.

= V

(3) Current limit is the output current that produces a 10% change in output voltage from V (4) For V (5) The REG101 no longer regulates when V

> 6.5V, see typical characteristic “I

ENABLE

vs V

ENABLE

< V

+ V

IN

OUT

DROP (MAX)

”.

ENABLE

. In drop-out, the impedance from VIN to V

+ 1V and I

IN

OUT

= 2mA.

OUT

is typically less than 1Ω at TJ = +25°C.

OUT

(1)

= 0.1µF

, unless otherwise noted.

REG101NA REG101UA

1.267 V

0.2 1 µA

±2.2 %

±0.8 ±2.0 %

OUT

60 mA

IN

1 100 nA

= V

IN

µVrms µVrms

+ 1V at fixed

OUT

V

REG101

SBVS026D

3

TYPICAL CHARACTERISTICS

For all models, at TJ = +25°C and V

= 1.8V, unless otherwise noted.

ENABLE

OUTPUT VOLTAGE CHANGE vs I

(V

= V

+ 1V, Output Voltage % Change

IN

OUT

0.80

Referred to I

= 50mA at +25°C)

OUT

0.60

0.40

0.20

+25°C

0.00

–0.20 –0.40

Output Voltage Change (%)

–0.60

–55°C

–0.80

2004010 30 6050 70 80 90 100

I

(mA)

OUT

LINE REGULATION

20

(Referred to V

= V

+ 1V at I

IN

OUT

15 10

5 0

I

OUT

= 2mA

I

OUT

= 50mA

–5

–10

Output Voltage Change (mV)

–15

I

OUT

= 100mA

–20

012345 867

VIN – V

OUT

(V)

= 50mA)

OUT

+125°C

LOAD REGULATION vs TEMPERATURE

(V

= V

+ 1V)

IN

OUT

0.0%

–0.1%

10mA < I

< 100mA

OUT

–0.2%

–0.3%

Output Voltage Change (%)

2mA < I

< 1000mA

OUT

–0.4%

–25–50 0 7525 50 100 125

Temperature (°C)

LINE REGULATION vs TEMPERATURE

0.10 I

= 100mA

OUT

0.08

0.06

0.04

0.02

0.00

(V

+ 1V) < VIN < 10V

OUT

–0.02 –0.04 –0.06

Output Voltage Change (%)

–0.08 –0.10

(V

+ 0.4V) < VIN < 10V

OUT

–50 –25 0 25 50 75 100 125

Temperature (°C)

100

80

60

40

DC Dropout Voltage (mV)

20

0

0 10 100

4

DC DROPOUT VOLTAGE vs I

OUT

+125°C

+25°C

–55°C

20 30 40 50 60 70 80 90

I

(mA)

OUT

100

DC DROPOUT VOLTAGE vs TEMPERATURE

I

= 100mA

OUT

80

60

40

DC Dropout Voltage (mV)

20

0

–50 1251007550250–25

Temperature (°C)

REG101

SBVS026D

TYPICAL CHARACTERISTICS (Cont.)

0

10

20

30

40

50

60

70

80

90

100

5

15

25

35

45

55

65

75

85

95

30

25

20

15

10

5

0

Percentage of Units (%)

V

OUT

Drift (ppm/°C)

OUTPUT VOLTAGE DRIFT HISTOGRAM

–50 –25 0 25 50 75 125100

600 575 550 525 500 475 450 425 400

I

GND

(µA)

Temperature (°C)

GROUND PIN CURRENT vs TEMPERATURE

I

OUT

= 100mA

V

OUT

= 5V

V

OUT

= 3.3V

V

OUT

= 2.5V

VIN = V

OUT

+ 1V

For all models, at TJ = +25°C and V

= 1.8V, unless otherwise noted.

ENABLE

18

OUTPUT VOLTAGE ACCURACY HISTOGRAM

16 14 12 10

8 6

Percentage of Units (%)

4 2 0

0.0

0.2

–1.0

–0.8

–0.6

–0.4

–0.2

0.4

Error (%)

OUTPUT VOLTAGE vs TEMPERATURE

(Output Voltage % Change Referred

to I

= 50mA at +25°C)

0.50

OUT

0.40

0.30

0.20

I

OUT

= 2mA

0.10

0.00

–0.10 –0.20 –0.30

Output Voltage Change (%)

–0.40

I

OUT

= 100mA

–0.50

–50 25–25 0 50 75 100 125

Temperature (°C)

I

OUT

0.6

= 50mA

0.8

1.0

GROUND PIN CURRENT, NOT ENABLED

vs TEMPERATURE

1µ

V

= 0.5V

ENABLE

V

+ 1V

= V

IN

OUT

100n

(A)

10n

GND

I

1n

100p

–50 25–25 0 50 75 100 125

Temperature (°C)

600

GROUND PIN CURRENT vs I

V

= 5.0V

500

OUT

400

(µA)

300

GND

I

200

100

0

REG101

SBVS026D

VIN = V

OUT

+ 1V

0203010 5040 7060 9080 100

OUT

V

= 3.3V

OUT

V

= 2.5V

OUT

I

(mA)

OUT

5

TTYPICAL CHARACTERISTICS (Cont.)

For all models, at TJ = +25°C and V

= 1.8V, unless otherwise noted.

ENABLE

80

RIPPLE REJECTION vs FREQUENCY

I

= 2mA

I

OUT

= 100mA

C

I

OUT

= 2mA

= 10µF

70 60 50 40 30

Ripple Rejection (dB)

20 10

C

= 0µF

OUT

0

10 100 1k 10k 100k 10M1M

Frequency (Hz)

RMS NOISE VOLTAGE vs C

60

REG101-5.0

50

40

REG101-3.3

30

20

REG101-2.5

Noise Voltage (µVrms)

10

CNR = 0.01µF

10Hz < BW < 100kHz

0

0.1

110

C

(µF)

OUT

I

C

OUT

= 100mA

= 10µF

30

RIPPLE REJECTION vs (V

– V

IN

REG101-3.3

25

20

15

10

Ripple Rejection (dB)

5

0

Frequency = 100kHz

C

I

OUT

0 0.1 0.40.2 0.3 0.5 0.6 0.7 10.8 0.9

VIN - V

OUT

(V)

RMS NOISE VOLTAGE vs C

110 100

90 80 70

REG101-3.3

REG101-2.5

REG101-5.0

60 50

Noise Voltage (µVrms)

40 30

CNR = 0µF

10Hz < BW < 100kHz

20

110 1k

100 10k

CNR (pF)

)

OUT

= 10µF

OUT

= 100mA

NR

10

I

= 100mA

OUT

C

= 0µF

NR

(µV/√Hz)

N

e

1

0.1

C

= 0µF

OUT

C

0.01 10 100 1k 10k 100k

OUT

= 1µF

= 10µF

10

I

= 100mA

OUT

C

= 0.01µF

NR

1

(µV/√Hz)

N

e

0.1

0.01 10 100 1k 10k 100k

Frequency (Hz)

6

NOISE SPECTRAL DENSITY

C

Frequency (Hz)

OUT

C

= 0µF

C

= 1µF

OUT

= 10µF

OUT

REG101

SBVS026D

TYPICAL CHARACTERISTICS (Cont.)

–50 –25

I

SC

125

180

160

140

120

100

80

60

40

I

OUT

(mA)

Temperature (°C)

CURRENT LIMIT vs TEMPERATURE

I

CL

0 25 50 75 100

V

IN = VOUT

+ 1V

LINE TRANSIENT RESPONSE

50µs/div

5.3V

50mV/div50mV/div

V

IN

V

OUT

V

OUT

4.3V

REG101-3.3

I

OUT

= 100mA

C

OUT

= 0

C

OUT

= 10µF

TURN-OFF

200µs/div

1V/div1V/div

V

ENABLE

V

OUT

REG101-3.3

C

NR

= 0.01µF

C

OUT

= 0µF

R

LOAD

= 1600Ω

C

OUT

= 10µF

R

LOAD

= 33Ω

C

OUT

= 1.0µF

R

LOAD

= 33Ω

For all models, at TJ = +25°C and V

= 1.8V, unless otherwise noted.

ENABLE

3.5

FOLDBACK CURRENT LIMIT

3.0

REG101-3.3

2.5

2.0

1.5

Output Voltage (V)

1.0

0.5

I

SC

0

04020 140 160

80 100 12060 180

Output Current (mA)

LOAD TRANSIENT RESPONSE

REG101-3.3

V

= 4.3V

IN

200mV/div200mV/div

I

CL

C

= 0µF

OUT

V

OUT

100mA

10mA

R

1V/div1V/div

REG101

SBVS026D

C

= 0µF

OUT

= 1600Ω

LOAD

10µs/div

TURN-ON

250µs/div

C

R

OUT LOAD

C

OUT

= 10µF

= 33Ω

= 10µF

C

OUT

R

LOAD

REG101-3.3

V

= V

IN

OUT

C

= 0.01µF

NR

= 0µF

= 33Ω

+ 1V

V

OUT

I

OUT

V

OUT

V

ENABLE

7

TYPICAL CHARACTERISTICS (Cont.)

For all models, at TJ = +25°C and V

I

10µ

ENABLE

1µ

(A)

100n

ENABLE

I

T = +125°C

T = +25°C

10n

T = –55°C

1n

678910

= 1.8V, unless otherwise noted.

ENABLE

vs V

ENABLE

V

(V)

ENABLE

V

OUT

R

LOAD

500mV/div

V

POWER UP/POWER DOWN

= 3.0V

= 30Ω

V

IN

OUT

1s/div

(µVrms)

n

V

200mV/div

100mA

10mA

80

RMS NOISE VOLTAGE vs C

70

60

10Hz < frequency < 100kHz

ADJ

REG101–A

= 3.3V

V

OUT

= 0.1µF

C

OUT

50

40

30

20

10 100 1k 10k 100k

C

(pF)

ADJ

LOAD TRANSIENT-ADJUSTABLE VERSION

C

= 0

OUT

C

= 10µF

OUT

REG101–A

= 4.3V

V

IN

= 3.3V

V

OUT

V

I

OUT

0.350

0.300

0.250

0.200

(µA)

ADJ

0.150

I

0.100

0.050

0.000

50mV/div

5.3V

4.3V

ADJUST PIN CURRENT vs TEMPERATURE

–50 –25 0 25 50 75 100 125

Temperature (°C)

LINE TRANSIENT-ADJUSTABLE VERSION

C

= 0

OUT

= 10µF

C

OUT

REG101–A

= 100mA

I

OUT

= 0.01µF

C

FB

= 3.3V

V

OUT

V

OUT

V

OUT

V

IN

8

REG101

SBVS026D