TEXAS INSTRUMENTS REG104 Technical data

REG

104

REG104

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REG104

SBVS025G – SEPTEMBER 2001 – REVISED SEPTEMBER 2005

DMOS

1A Low-Dropout Regulator

FEATURES

● NEW DMOS TOPOLOGY:

Ultra Low Dropout Voltage: 230mV typ at 1A and 3.3V Output Output Capacitor NOT Required for Stability

● FAST TRANSIENT RESPONSE

● VERY LOW NOISE: 33µV

RMS

● HIGH ACCURACY: ±2% max

● HIGH EFFICIENCY:

I

= 1.7mA at I

GND

Not Enabled: I

OUT

= 0.5µA

GND

= 1A

● 2.5V, 2.7V, 3.0V, 3.3V, 5.0V AND

ADJUSTABLE OUTPUT VERSIONS

● THERMAL PROTECTION

● SMALL SURFACE-MOUNT PACKAGES:

SOT223-5, DDPAK-5

APPLICATIONS

● PORTABLE COMMUNICATION DEVICES

● BATTERY-POWERED EQUIPMENT

● MODEMS

● BAR-CODE SCANNERS

● BACKUP POWER SUPPLIES

DESCRIPTION

The REG104 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 230mV 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 1.7mA (at I drops to 0.5µA in

not enabled

mode. Unlike regulators with PNP pass devices, quiescent current remains relatively constant over load variations and under dropout conditions.

The REG104 has very low output noise (typically 33µV for V

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

OUT

in portable communications equipment. On-chip trimming results in high output voltage accuracy. Accuracy is maintained over temperature, line, and load variations. Key parameters are tested over the specified temperature range (–40°C to +85°C).

The REG104 is well protected—internal circuitry provides a current limit which protects the load from damage. Thermal protection circuitry keeps the chip from being damaged by excessive temperature. The REG104 is available in the DDPAK-5 and the SOT223-5.

= 1A) and

OUT

RMS

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.

REG104

(Fixed Voltage

Versions)

Gnd

V

+

C

OUT

(1)

NOTE: (1) Optional.

V

IN

www.ti.com

Enable

V

OUT

+

0.1µF

REG104-A

Gnd

R Adj R

+

1

2

(1)

C

OUT

ABSOLUTE MAXIMUM RATINGS

Supply Input Voltage, VIN.......................................................–0.3V to 16V

Enable Input Voltage, V

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

NR Pin Voltage, V

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

Operating Temperature Range ....................................... –55°C to +125°C

Storage Temperature Range .......................................... –65°C to +150°C

Junction Temperature ..................................................... –55°C to +150°C

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

ESD Rating: HBM (V

HBM (All other pins)........................................................ 2kV

CDM.............................................................................. 500V

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

to GND) ..................................................... 1.5kV

OUT

(1)

IN

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

REG104xx-

(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.

yyyy/zzz

(1)

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

DDPAK-5

1234

V

Gnd

O

(1)

NR/Adjust

(KTT Package)

Tab is Gnd

5

V

IN

Enable

NOTE: (1) For REG104A-A: voltage setting resistor pin. All other models: noise reduction capacitor pin.

SOT223-5

Tab is Gnd

12345

Enable

GndV

IN

V

OUT

(DCQ Package)

NR/Adjust

(1)

2

REG104

SBVS025G

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

= 3.0V for REG104-A), V

OUT

ENABLE

= 2V, I

= 10mA, CNR = 0.01µF, and C

OUT

PARAMETER CONDITION MIN TYP MAX UNITS OUTPUT VOLTAGE

Output Voltage Range V

REG104-2.5 2.5 V

OUT

REG104-2.7 2.7 V REG104-3.0 3.0 V REG104-3.3 3.3 V REG104-5 5V REG104-A V

Reference Voltage V Adjust Pin Current I

Accuracy ±0.5 ±2%

= –40°C to +85°C ±3.0 %

T

J

vs Temperature dV

vs Line and Load I

= –40°C to +85°CV

T

J

DC DROPOUT VOLTAGE

(2, 3)

For all models except 5V I For 5V model I

For all models except 5V I

= –40°C to +85°C

T

J

For 5V models I

= –40°C to +85°C

T

J

REF

ADJ

/dT TJ = –40°C to +85°C70ppm/°C

OUT

V

DROP

= 10mA to 1A, VIN = (V

OUT

IN

= (V

I

OUT

OUT OUT OUT

OUT

+ 0.7V) to 15V ±0.5 ±2.5 %

OUT

+ 0.9V) to 15V ±3.5 %

= 10mA 3 25 mV = 1A 230 400 mV = 1A 320 500 mV

= 1A 480 mV = 1A 580 mV

REF

VOLTAGE NOISE

f = 10Hz to 100kHz V Without CNR (all models) CNR = 0, C With C

OUTPUT CURRENT

Current Limit

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

NR

(4)

= –40°C to +85°C 1.0 2.2 A

T

J

n

I

CL

= 0 35µV

OUT

= 10µF10µV

OUT

1.2 1.7 2.1 A

RIPPLE REJECTION

f = 120Hz 65 dB

ENABLE CONTROL

V

High (output enabled) V

ENABLE

Low (output disabled) –0.2 0.5 V

V

ENABLE

I

High (output enabled) I

ENABLE

Low (output disabled) V

I

ENABLE

Output Disable Time 50 µs

ENABLE

V

= 2V to VIN, VIN = 2.1V to 6.5

ENABLE

= 0V to 0.5V 2 100 nA

ENABLE

(5)

2V

Output Enable Softstart Time 1.5 ms

THERMAL SHUTDOWN

Junction Temperature

Shutdown 150 °C Reset from Shutdown 130 °C

GROUND PIN CURRENT

Ground Pin Current I

GND

Enable Pin Low V

INPUT VOLTAGE V Operating Input Voltage Range

(6)

IN

Specified Input Voltage Range V

= –40°C to +85°CV

T

J

I

= 10mA 0.5 0.7 mA

OUT

= 1A 1.7 1.8 mA

I

OUT

≤ 0.5V 0.5 µA

ENABLE

2.1 15 V

> 2.7V V

IN

> 2.9V V

IN

+ 0.7 15 V

OUT

+ 0.9 15 V

OUT

TEMPERATURE RANGE

Specified Range T Operating Range –55 +125 °C

J

–40 +85 °C

Storage Range –65 +150 °C Thermal Resistance

DDPAK-5 Surface Mount SOT223-5 Surface Mount

θ

JC

θ

JC

Junction-to-Case 4 °C/W Junction-to-Case 15 °C/W

NOTES: (1) The REG104 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

at fixed load. (3) Not applicable for V (4) Current limit is the output current that produces a 15% change in output voltage from V (5) For V (6) The REG104 no longer regulates when V

> 6.5V, see typical characteristic

IN

to V

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

OUT

less than 2.7V.

OUT

V

ENABLE

< V

IN

OUT

vs I

+ V

ENABLE

= V

+ 1V and I

IN

.

. In drop-out or when the input voltage is between 2.7V and 2.1V, the impedance from V

DROP (MAX)

Output Voltage Change vs V

OUT

.

IN

(1)

= 0.1µF

, unless otherwise noted.

REG104GA REG104FA

5.5 V

1.295 V

0.2 1 µA

/V • V

RMS

OUT

/V • V

RMS

OUT

IN

1 100 nA

= 10mA.

µV

RMS

µV

RMS

V

= V

+ 1V

IN

OUT

IN

REG104

SBVS025G

3

TYPICAL CHARACTERISTICS

For all models, at TJ = +25°C and V

= 2V, unless otherwise noted.

ENABLE

0.8

0.6

0.4

OUTPUT VOLTAGE CHANGE vs I

(VIN = V

+ 1V, Output Voltage % Change

OUT

Referred to I

= 10mA at +25°C)

OUT

+125°C

OUT

0.2 0

–0.2

+25°C

–0.4 –0.6 –0.8

Output Voltage Change (%)

–55°C

–1

–1.2

0 200100 600500400300 700 800 900 1000

Output Current (mA)

0.5

OUTPUT VOLTAGE CHANGE vs V

(Output Voltage % Change Referred to

V

= V

I

OUT

= 10mA

+ 1V at I

IN

OUT

= 10mA)

OUT

I

OUT

= 200mA

IN

0

I

= 1000mA

–0.5

OUT

–1

–1.5

Output Voltage Change (%)

–2

02 6841012

Input Voltage Above V

OUT

(V)

350

DC DROPOUT VOLTAGE vs I

OUT

300

250

+125°C

200

150

100

DC Dropout Voltage (mV)

50

0

0 200 600400 800 1000

I

(mA)

OUT

OUTPUT VOLTAGE CHANGE vs I

(Output Voltage % Change Referred to

I

= 10mA at +25°C)

I

OUT

= 10mA

0.6

0.4

0.2 0

–0.2 –0.4 –0.6

Output Voltage (%)

I

= 1000mA

OUT

–0.8

–1

–1.2

–60 –40 –20 40 600 20 10080 120

Temperature (°C)

OUT

I

= 200mA

OUT

+25°C

–55°C

350

DC DROPOUT VOLTAGE vs TEMPERATURE

300

I

= 1000mA

OUT

250

200

150

100

DC Dropout Voltage (mV)

50

0

–75 –50 –25 25 500 10075 125

I

OUT

= 200mA

I

OUT

= 10mA

Temperature (°C)

4

LINE REGULATION vs TEMPERATURE

= V

IN

+ 1V to 16V)

OUT

0.5

(V

0.4

0.3 I

= 10mA

OUT

0.2

0.1

Output Voltage Change (%)

I

OUT

= 200mA

0

–75 –50 –25 25 500 10075 125

Temperature (°C)

REG104

SBVS025G

TYPICAL CHARACTERISTICS (Cont.)

6V

V

IN

V

OUT

V

OUT

5V

50mV/div50mV/div

50µs/div

LINE TRANSIENT RESPONSE

C

OUT

= 10µF

C

OUT

= 0

REG104-3.3

I

OUT

= 200mA

For all models, at TJ = +25°C and V

LOAD TRANSIENT RESPONSE

500mV/div500mV/div

= 2V, unless otherwise noted.

ENABLE

REG104-3.3

C

= 0

OUT

C

= 10µF

OUT

V

OUT

V

OUT

1A

10mA

C

500mV/div500mV/div

1A

REG104–A

= 0.01µF, V

FB

10µs/div

LOAD TRANSIENT RESPONSE

= 3.3V

OUT

C

= 0

OUT

C

= 10µF

OUT

10µs/div

I

LOAD

Load = 200mA, C

50mV/div50mV/div

6V 5V

LOAD TRANSIENT RESPONSE

REG104–A

FB

C

OUT

C

OUT

= 0.01µF, V

= 0

= 10µF

OUT

= 3.3V

50µs/div

V

IN

LOAD REGULATION vs TEMPERATURE

= V

(V

0.5

IN

0.4

0.3

0.2

0.1

Output Voltage Change (%)

0

–60 –40 –20 40 600 20 10080 120

REG104

SBVS025G

+ 1V and 10mA < I

OUT

Temperature (°C)

< 1000mA)

OUT

10

OUTPUT NOISE DENSITY

5 2 1

0.5

0.2 CNR = 0 C

OUT

C

= 0.01µF

NR

C

OUT

= 0

= 10µF

Noise Density (µV/√Hz)

0.1

0.05

0.02

0.01 10 100 1000 10000 100,000

Frequency (Hz)

5

TYPICAL CHARACTERISTICS (Cont.)

For all models, at TJ = +25°C and V

= 2V, unless otherwise noted.

ENABLE

1.8

GROUND PIN CURRENT vs TEMPERATURE

I

= 1000mA

1.6

OUT

1.4

1.2

(mA)

1

GND

I

0.8

0.6

I

OUT

I

OUT

= 200mA

= 10mA

0.4 –60 –40 –20 0 20 40 60 80 120100

Temperature (°C)

GROUND PIN CURRENT vs I

1.6

1.4

1.2

(mA)

1

GND

I

0.8

0.6

OUT

GROUND PIN CURRENT, NOT ENABLED

vs TEMPERATURE

3

V

= 0V

ENABLE

2.5

2

(µA)

1.5

GND

I

1

0.5

0

–75 –50 –25 0 25 50 75 100 125

Temperature (°C)

vs TEMPERATURE

I

0.28

0.26

ADJUST

REG104-A

0.24

0.22

0.20

0.18

Adjust Pin Current (µA)

0.16

0.4

1 10010 1000

I

(mA)

OUT

CURRENT LIMIT vs TEMPERATURE

1850

V

= V

OUT

OUT-NOMINAL

1800

1750

V

= 1V

OUT

1700

1650

Current Limit (mA)

1600

1550

–60 –40 –20 40 600 20 10080 120

Temperature (°C)

• 0.90

0.14 –20–40 0 40 80 120–60 20 60 100 140

Temperature (°C)

RIPPLE REJECTION vs FREQUENCY

70

60

50

C

OUT

40

Ripple Rejection (dB)

30

20

10 100 1k 10k 100k

Frequency (Hz)

= 10µF

C

OUT

= 0

6

REG104

SBVS025G

TYPICAL CHARACTERISTICS (Cont.)

OUTPUT VOLTAGE DRIFT HISTOGRAM

Percent of Units (%)

V

OUT

Drift (ppm/°C)

40 45 50 55 60 65 70 75 80 85 90

45 40 35 30 25 20 15 10

5 0

For all models, at TJ = +25°C and V

= 2V, unless otherwise noted.

ENABLE

75

RIPPLE REJECTION vs I

V

70

RIPPLE

OUT

= 3Vp-p, f = 120Hz

65

60

55

50

Ripple Rejection (dB)

45

40

0 200 400 600 800 1000

I

(mA)

OUT

OUTPUT DISABLE TIME

= 0

C

OUT

1V/div

SOFT START

V

1V/div

2V V

OUT

ENABLE

0

250µs/div

V

OUT

2V

0

REG104

SBVS025G

10µs/div

V

ENABLE

OUTPUT VOLTAGE ACCURACY HISTOGRAM

60

50

40

30

20

Percent of Units (%)

10

0

–1 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 1

Error (%)

7

BASIC OPERATION

The REG104 series is a family of LDO (Low DropOut) linear regulators. The family includes five fixed output versions (2.5V to 5.0V) and an adjustable output version. An internal DMOS power device provides low dropout regulation with near constant ground pin current (largely independent of load and dropout conditions) and very fast line and load transient response. All versions include internal current limit and thermal shutdown circuitry.

Figure 1 shows the basic circuit connections for the fixed voltage models. Figure 2 gives the connections for the adjustable output version (REG104A) and example resistor values for some commonly used output voltages. Values for other voltages can be calculated from the equation shown in Figure 2.

Enable

V

IN

0.1µF

REG104

In Out

Gnd NR

C

0.01µF

NR

V

OUT

C

OUT

None of the versions require an output capacitor for regulator stability. The REG104 will accept any output capacitor type less than 1µF. For capacitance values larger than 1µF the effective ESR should be greater than 0.1Ω. This minimum ESR value includes parasitics such as printed circuit board traces, solder joints, and sockets. A minimum 0.1µF low ESR capacitor connected to the input supply voltage is recommended.

ENABLE

The Enable pin allows the regulator to be turned on and off. This pin is active HIGH and compatible with standard TTLCMOS levels. Inputs below 0.5V (max) turn the regulator off and all circuitry is disabled. Under this condition ground-pin current drops to approximately 0.5µA.

When not used, the Enable pin may be connected to V Internal to the part, the Enable pin is connected to an input resistor-zener diode circuit, as shown in Figure 3, creating a nonlinear input impedance.

Enable

175kΩ

V

= 10V

Z

IN

.

Optional

FIGURE 1. Fixed Voltage Nominal Circuit for REG104.

Enable

5

V

IN

0.1µF

Pin numbers for SOT-223 package.

1

REG104

V

= (1 + R1/R2) • 1.295V

OUT

To reduce current through divider, increase resistor values (see table at right).

As the impedance of the resistor divider increases, I

(~200nA) may introduce an error.

ADJ

C

improves noise and transient response.

FB

2

R

Adj R

1

2

I

ADJ

4

3

Gnd

C

FB

0.01µF

FIGURE 3. Enable Pin Equivalent Input Circuit.

EXAMPLE RESISTOR VALUES

V

(V) R1 (Ω)

OUT

1.295 Short Open

2.5 12.1k 13k

3 16.9k 13k

3.3 20k 13k

5 37.4k 13k

NOTE: (1) Resistors are standard 1% values.

(1)

R2 (Ω)

1.21k 1.3k

1.69k 1.3k

2.0k 1.3k

3.74k 1.3k

C

OUT

Optional

Load

V

OUT

(1)

FIGURE 2. Adjustable Voltage Circuit for REG104A.

8

REG104

SBVS025G

The Enable Pin Current versus Applied Voltage relationship is shown in Figure 4. When the Enable pin is connected to V

greater than 10V, a series resistor may be used to limit

IN

the current.

100

10

1

Since the value of V

is 1.295V, this relationship reduces to:

REF

V

µ

V

=

N

RMS

V

•35

OUT

Connecting a capacitor, CNR, from the Noise-Reduction (NR) pin to ground can reduce the output noise voltage. Adding C

, as shown in Figure 5, forms a low-pass filter for the

NR

voltage reference. For C

= 10nF, the total noise in the

NR

10Hz to 100kHz bandwidth is reduced by approximately a factor of 3.5. This noise reduction effect is shown in Figure 6.

0.1

Enable Current (µA)

0.01

0.001 0 2 4 6 8 10 12 14 16

Enable Voltage

FIGURE 4. Enable Pin Current versus Applied Voltage.

OUTPUT NOISE

A precision band-gap reference is used for the internal reference voltage, V the dominant noise source within the REG104. It generates approximately 45µV the reference output. The regulator control loop gains up the reference noise, so that the noise voltage of the regulator is approximately given by:

VV

=µ

N

, for the REG104. This reference is

REF

in the 10Hz to 100kHz bandwidth at

RMS

RR

+

12

=µ •45

45

RMS RMS

2

R

V

V V

OUT REF

45

35

10Hz - 100kHz)

RMS

Output Noise Voltage

(µV

25

0.001 0.01 0.1 1 CNR (µF)

REG104-3.3

C

= 0

OUT

C

= 10µF

OUT

FIGURE 6. Output Noise versus Noise Reduction Capacitor.

The REG104 adjustable version does not have the noisereduction pin available, however, the adjust pin is the summing junction of the error amplifier. A capacitor, C

V

IN

FB

,

NR

(fixed output

versions only)

C

NR

(optional)

Enable

FIGURE 5. Block Diagram.

REG104

SBVS025G

V

REF

(1.295V)

Low Noise

Charge Pump

Over Current

Over Temp

Protection

DMOS Output

REG104

V

OUT

R

1

Adj

(Adjustable

R

Versions)

2

NOTE: R1 and R2 are internal on fixed output versions.

9

connected from the output to the adjust pin will reduce both the output noise and the peak error from a load transient. Figure 7 shows improved output noise performance for two capacitor combinations.

10.0

1.0

nV/√Hz

C

= 0, CFB = 0

OUT

C

= 0, CFB = 0.01µF

OUT

C

= 10µF, CFB = 0.01µF

0.1

OUT

10010 1000 10000 100000

Frequency

FIGURE 7. Output Noise Density on Adjustable Versions.

The REG104 utilizes an internal charge pump to develop an internal supply voltage sufficient to drive the gate of the DMOS pass element above V

. The charge-pump switching

IN

noise (nominal switching frequency = 2MHz) is not measurable at the output of the regulator.

DROP-OUT VOLTAGE

The REG104 uses an N-channel DMOS as the ment. When the input voltage is within a few hundred millivolts of the output voltage, the DMOS device behaves like a resistor. Therefore, for low values of V regulator’s input-to-output resistance is the Rds DMOS pass element (typically 230mΩ). For static (DC) loads, the REG104 will typically maintain regulation down to V

IN

to V

voltage drop of 230mV at full rated output current.

OUT

In Figure 8, the bottom line (DC dropout) shows the minimum V

to V

IN

voltage drop required to prevent dropout under

OUT

DC load conditions.

250

200

150

100

Drop Out Voltage (mV)

50

0

0 100 200 300 400 500

REG104 –3.3 at 25°C

DC Transient

I

OUT

(mA)

IN

to V

pass

OUT

of the

ON

ele-

, the

For large step changes in load current, the REG104 requires a larger voltage drop across it to avoid degraded transient response. The boundary of this shown as the top line in Figure 8. Values of V

transient dropout

region is

to V

IN

OUT

voltage drop above this line insure normal transient response.

In the transient dropout region between

DC

and

Transient

transient response recovery time increases. The time required to recover from a load transient is a function of both the magnitude and rate of the step change in load current and the available worst-case conditions (full-scale load change with V V

voltage drop close to DC dropout levels), the REG104

OUT

headroom

VIN to V

voltage drop. Under

OUT

to

IN

can take several hundred microseconds to re-enter the specified window of regulation.

TRANSIENT RESPONSE

The REG104 response to transient line and load conditions improves at lower output voltages. The addition of a capacitor (nominal value 10nF) from the output pin to ground may improve the transient response. In the adjustable version, the addition of a capacitor, C

(nominal value 10nF), from the

FB

output to the adjust pin will also improve the transient response.

THERMAL PROTECTION

Power dissipated within the REG104 will cause the junction temperature to rise. The REG104 has thermal shutdown circuitry that protects the regulator from damage. The thermal protection circuitry disables the output when the junction temperature reaches approximately 150°C, allowing the device to cool. When the junction temperature cools to approximately 130°C, the output circuitry is again enabled. Depending on various conditions, the thermal protection circuit may cycle on and off. This limits the dissipation of the regulator, but may have an undesirable effect on the load.

Any tendency to activate the thermal protection circuit indicates excessive power dissipation or an inadequate heat sink. For reliable operation, junction temperature should be limited to 125°C, maximum. To estimate the margin of safety in a complete design (including heat sink), increase the ambient temperature until the thermal protection is triggered. Use worst-case loads and signal conditions. For good reliability, thermal protection should trigger more than 35°C above the maximum expected ambient condition of your application. This produces a worst-case junction temperature of 125°C at the highest expected ambient temperature and worst-case load.

The internal protection circuitry of the REG104 has been designed to protect against overload conditions. It was not intended to replace proper heat sinking. Continuously running the REG104 into thermal shutdown will degrade reliability.

,

FIGURE 8. Transient and DC Dropout.

10

REG104

SBVS025G

POWER DISSIPATION

5

4

3

2

1

0

Power Dissipation (Watts)

0 25 50 75 125100

Ambient Temperature (°C)

CONDITIONS

#1 #2 #3 #4

The REG104 is available in two different package configurations. The ability to remove heat from the die is different for each package type and, therefore, presents different considerations in the printed circuit board (PCB) layout. The PCB area around the device that is free of other components moves the heat from the device to the ambient air. While it is difficult to impossible to quantify all of the variables in a thermal design of this type, performance data for several configurations are shown in Figure 9. In all cases the PCB copper area is bare copper, free of solder resist mask, and not solder plated. All examples are for 1-ounce copper. Using heavier copper will increase the effectiveness in moving the heat from the device. In those examples where there is copper on both sides of the PCB, no connection has been provided between the two sides. The addition of plated through holes will improve the heat sink effectiveness.

Power dissipation depends on input voltage and load conditions. Power dissipation is equal to the product of the average output current times the voltage across the output element, V

Power dissipation can be minimized by using the lowest possible input voltage necessary to assure the required output voltage.

IN

to V

voltage drop.

OUT

PVV I

=•( – )

DIN

OUT OUT AVG

()

CONDITION PACKAGE PCB AREA

1 DDPAK 4in2 Top Side Only 27°C/W 2 SOT-223 4in2 Top Side Only 53°C/W 3 DDPAK None 65°C/W 4 SOT-223 0.5in

2

Top Side Only 110°C/W

θ

JA

FIGURE 9. Maximum Power Dissipation versus Ambient

Temperature for the Various Packages and PCB Heat Sink Configurations.

REG104

SBVS025G

11

REGULATOR MOUNTING

The tab of both packages is electrically connected to ground. For best thermal performance, the tab of the DDPAK surface-mount version should be soldered directly to a circuitboard copper area. Increasing the copper area improves heat dissipation. Figure 10 shows typical thermal resistance from junction to ambient as a function of the copper area for the DDPAK. Figure 11 shows the same relationship for the SOT-223.

THERMAL RESISTANCE vs PCB COPPER AREA

50

40

(°C/W)

JA

30

20

10

Thermal Resistance, θ

0

012345

Copper Area (inches

REG104

Surface Mount Package

1 oz. copper

2

)

Although the tabs of the DDPAK and the SOT-223 are electrically grounded, they are not intended to carry any current. The copper pad that acts as a heat sink should be isolated from the rest of the circuit to prevent current flow through the device from the tab to the ground pin. Solder pad footprint recommendations for the various REG104 devices are presented in the Application Bulletin

mendations for Surface-Mount Devices

Solder Pad Recom-

(SBFA015A), avail-

able from the Texas Instruments web site (www.ti.com).

Circuit Board Copper Area

DDPAK Surface Mount Package

REG104

FIGURE 10. Thermal Resistance versus PCB Area for the Five-Lead DDPAK.

180 160 140

(°C/W)

JA

120

θ

100

Thermal Resistance,

THERMAL RESISTANCE vs PCB COPPER AREA

REG104

Surface Mount Package

1 oz. copper

80 60 40 20

0

012345

Copper Area (inches

2

)

FIGURE 11. Thermal Resistance versus PCB Area for the Five Lead SOT-223.

Circuit Board Copper Area

REG104

SOT-223 Surface Mount Package

12

REG104

SBVS025G

PACKAGE OPTION ADDENDUM

www.ti.com

PACKAGING INFORMATION

Orderable Device Status

REG104FA-2.5 OBSOLETE DDPAK/

REG104FA-2.5/500 NRND DDPAK/

REG104FA-2.5KTTT NRND DDPAK/

REG104FA-2.7 OBSOLETE DDPAK/

REG104FA-2.7/500 ACTIVE DDPAK/

REG104FA-2.7/500G3 ACTIVE DDPAK/

REG104FA-2.7KTTT ACTIVE DDPAK/

REG104FA-3 OBSOLETE DDPAK/

REG104FA-3.3 OBSOLETE DDPAK/

REG104FA-3.3/500 ACTIVE DDPAK/

REG104FA-3.3KTTT ACTIVE DDPAK/

REG104FA-3/500 NRND DDPAK/

REG104FA-3/500G3 ACTIVE DDPAK/

REG104FA-3KTTT NRND DDPAK/

REG104FA-5 OBSOLETE DDPAK/

REG104FA-5/500 ACTIVE DDPAK/

REG104FA-5KTTT ACTIVE DDPAK/

REG104FA-A OBSOLETE DDPAK/

REG104FA-A/500 ACTIVE DDPAK/

REG104FA-AKTTT ACTIVE DDPAK/

REG104GA-2.5 NRND SOP DCQ 6 78 Green (RoHS &

REG104GA-2.5/2K5 NRND SOP DCQ 6 2500 Green (RoHS &

REG104GA-2.7 ACTIVE SOP DCQ 6 78 Green (RoHS &

REG104GA-2.7/2K5 ACTIVE SOP DCQ 6 2500 Green (RoHS &

REG104GA-2.7/2K5G4 ACTIVE SOP DCQ 6 2500 Green (RoHS &

(1)

Package

Type

TO-263

Package Drawing

KTT 5 TBD Call TI Call TI

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

KTT 5 TBD Call TI Call TI

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

KTT 5 TBD Call TI Call TI

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

KTT 5 TBD Call TI Call TI

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

KTT 5 TBD Call TI Call TI

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

Pins Package

Qty

Eco Plan

no Sb/Br)

(2)

Lead/Ball Finish MSL Peak Temp

Call TI Level-2-260C-1 YEAR

22-Sep-2005

(3)

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

Orderable Device Status

(1)

Package

Type

Package Drawing

Pins Package

Qty

Eco Plan

(2)

REG104GA-2.7G4 ACTIVE SOP DCQ 6 78 Green (RoHS &

Lead/Ball Finish MSL Peak Temp

Call TI Level-2-260C-1 YEAR

22-Sep-2005

(3)

no Sb/Br)

REG104GA-3 NRND SOP DCQ 6 78 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-3.3 ACTIVE SOP DCQ 6 78 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-3.3/2K5 ACTIVE SOP DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-3.3/2K5G4 ACTIVE SOP DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-3/2K5 NRND SOP DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-3/2K5G4 ACTIVE SOP DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-5 ACTIVE SOP DCQ 6 78 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-5/2K5 ACTIVE SOP DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-5/2K5G4 ACTIVE SOP DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-A ACTIVE SOP DCQ 6 78 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-A/2K5 ACTIVE SOP DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-A/2K5G4 ACTIVE SOP DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

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) 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. 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 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

Addendum-Page 2

PACKAGE OPTION ADDENDUM

www.ti.com

to Customer on an annual basis.

22-Sep-2005

Addendum-Page 3

PACKAGE OPTION ADDENDUM

www.ti.com

Orderable Device Status

(1)

Package

Type

Package Drawing

Pins Package

Qty

Eco Plan

(2)

Lead/Ball Finish MSL Peak Temp

27-Sep-2005

(3)

REG104GA-3 NRND SOP DCQ 6 78 TBD Call TI Call TI

REG104GA-3.3 ACTIVE SOP DCQ 6 78 TBD Call TI Call TI

REG104GA-3.3/2K5 ACTIVE SOP DCQ 6 2500 TBD Call TI Call TI

REG104GA-3.3/2K5G4 ACTIVE SOP DCQ 6 2500 TBD Call TI Call TI

REG104GA-3/2K5 NRND SOP DCQ 6 2500 TBD Call TI Call TI

REG104GA-3/2K5G4 ACTIVE SOP DCQ 6 2500 TBD Call TI Call TI

REG104GA-5 ACTIVE SOP DCQ 6 78 TBD Call TI Call TI

REG104GA-5/2K5 ACTIVE SOP DCQ 6 2500 TBD Call TI Call TI

REG104GA-5/2K5G4 ACTIVE SOP DCQ 6 2500 TBD Call TI Call TI

REG104GA-A ACTIVE SOP DCQ 6 78 TBD Call TI Call TI

REG104GA-A/2K5 ACTIVE SOP DCQ 6 2500 TBD Call TI Call TI

REG104GA-A/2K5G4 ACTIVE SOP DCQ 6 2500 TBD Call TI Call TI

(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) 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. 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 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 OPTION ADDENDUM

www.ti.com

PACKAGING INFORMATION

Orderable Device Status

REG104FA-2.5 OBSOLETE DDPAK/

REG104FA-2.5/500 NRND DDPAK/

REG104FA-2.5KTTT NRND DDPAK/

REG104FA-2.7 OBSOLETE DDPAK/

REG104FA-2.7KTTT ACTIVE DDPAK/

REG104FA-3 OBSOLETE DDPAK/

REG104FA-3.3 OBSOLETE DDPAK/

REG104FA-3.3/500 ACTIVE DDPAK/

REG104FA-3.3KTTT ACTIVE DDPAK/

REG104FA-3/500 NRND DDPAK/

REG104FA-3/500G3 ACTIVE DDPAK/

REG104FA-3KTTT NRND DDPAK/

REG104FA-3KTTTG3 ACTIVE DDPAK/

REG104FA-5 OBSOLETE DDPAK/

REG104FA-5/500 ACTIVE DDPAK/

REG104FA-5/500G3 ACTIVE DDPAK/

REG104FA-5KTTT ACTIVE DDPAK/

REG104FA-A OBSOLETE DDPAK/

REG104FA-A/500 ACTIVE DDPAK/

REG104FA-AKTTT ACTIVE DDPAK/

REG104GA-2.5 NRND SOT-223 DCQ 6 78 Green (RoHS &

REG104GA-2.5/2K5 NRND SOT-223 DCQ 6 2500 Green (RoHS &

REG104GA-2.5G4 ACTIVE SOT-223 DCQ 6 78 Green (RoHS &

REG104GA-2.7 ACTIVE SOT-223 DCQ 6 78 Green (RoHS &

REG104GA-2.7G4 ACTIVE SOT-223 DCQ 6 78 Green (RoHS &

(1)

Package

Type

TO-263

Package Drawing

KTT 5 TBD Call TI Call TI

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

KTT 5 TBD Call TI Call TI

KTT 5 50 Green (RoHS &

KTT 5 TBD Call TI Call TI

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

KTT 5 TBD Call TI Call TI

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

KTT 5 TBD Call TI Call TI

KTT 5 500 Green (RoHS &

KTT 5 50 Green (RoHS &

Pins Package

Qty

Eco Plan

no Sb/Br)

(2)

Lead/Ball Finish MSL Peak Temp

Call TI Level-2-260C-1 YEAR

28-Nov-2005

(3)

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

Orderable Device Status

(1)

Package

Type

Package Drawing

Pins Package

Qty

Eco Plan

REG104GA-3 NRND SOT-223 DCQ 6 78 Green (RoHS &

(2)

Lead/Ball Finish MSL Peak Temp

Call TI Level-2-260C-1 YEAR

28-Nov-2005

(3)

no Sb/Br)

REG104GA-3.3 ACTIVE SOT-223 DCQ 6 78 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-3.3/2K5 ACTIVE SOT-223 DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-3.3/2K5G4 ACTIVE SOT-223 DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-3.3G4 ACTIVE SOT-223 DCQ 6 78 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-3/2K5G4 ACTIVE SOT-223 DCQ 6 TBD Call TI Call TI

REG104GA-3G4 ACTIVE SOT-223 DCQ 6 78 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-5 ACTIVE SOT-223 DCQ 6 78 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-5/2K5 ACTIVE SOT-223 DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-5/2K5G4 ACTIVE SOT-223 DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-5G4 ACTIVE SOT-223 DCQ 6 78 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-A ACTIVE SOT-223 DCQ 6 78 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-A/2K5 ACTIVE SOT-223 DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

no Sb/Br)

REG104GA-A/2K5G4 ACTIVE SOT-223 DCQ 6 2500 Green (RoHS &

Call TI Level-2-260C-1 YEAR

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) 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. 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 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.

Addendum-Page 2

PACKAGE OPTION ADDENDUM

www.ti.com

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.

28-Nov-2005

Addendum-Page 3

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty . Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI.

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TEXAS INSTRUMENTS REG104 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual