TC1072-3.0VCH_技术文档

PRELIMINARY INFORMATION

50mA CMOS LDO WITH SHUTDOWN,

ERROR OUTPUT AND V_REFBYPASS

TC1072

50mA CMOS LDO WITH SHUTDOWN, ERROR OUTPUT AND V_REFBYPASS

CMOS construction eliminates wasted ground current, sig-

nificantly extending battery life. Total supply current is

typically50µAatfullload(20to60timeslowerthaninbipolar

regulators!).

FEATURES

■ Zero Ground Current for Longer Battery Life!

■ Very Low Dropout Voltage

■ Guaranteed 50mA Output

■ High Output Voltage Accuracy

■ Standard or Custom Output Voltages

■ Power-Saving Shutdown Mode

■ ERROR Ouput can be Used as a Low Battery

Detector, or Processor Reset Generator

■ Bypass Input for Ultra-quiet Operation

■ Over-Current and Over-Temperature Protection

■ Space-Saving SOT-23A-6 Package

■ Pin Compatible Upgrades for Bipolar Regulators

TC1072 key features include ultra low noise operation

(plus optional Bypass input); very low dropout voltage (typi-

cally 100mV at full load) and internal feed-forward compen-

sation for fast response to step changes in load. An error

output (ERROR) is asserted when the TC1072 is out-of-

regulation (due to a low input voltage or excessive output

current). ERRORcanbeusedasalowbatterywarningoras

a processor RESET signal (with the addition of an external

RC network). Supply current is reduced to less than 1µA,

andbothV_OUTandERRORaredisabledwhentheshutdown

input is low. The TC1072 incorporates both over-tempera-

ture and over-current protection.

APPLICATIONS

The TC1072 is stable with an output capacitor of only

1µF and has a maximum output current of 50mA. For higher

output current versions, please see the TC1107, TC1108

and TC1073 (I_OUT= 300mA) data sheets.

■ Battery Operated Systems

■ Portable Computers

■ Medical Instruments

■ Instrumentation

■ Cellular / GSM / PHS Phones

■ Linear Post-Regulator for SMPS

■ Pagers

ORDERING INFORMATION

Output

Junction

Part No.

Voltage **(V) Package

Temp. Range

GENERAL DESCRIPTION

TC1072-2.5VCH

TC1072-2.7VCH

TC1072-3.0VCH

TC1072-3.3VCH

TC1072-5.0VCH

2.5

2.7

3.0

3.3

5.0

SOT-23A-6* – 40°C to +125°C

The TC1072 is a high accuracy (typically ±0.5%) CMOS

upgradeforolder(bipolar)lowdropoutregulators. Designed

specifically for battery-operated systems, the TC1072’s

TYPICAL APPLICATION

1M

NOTE: *SOT-23A-6 is equivalent to the EIAJ (SC-74A)

** Other output voltages available. Please contact TelCom

Semiconductor for details

1

6

V

OUT

IN

OUT

1µF

PIN CONFIGURATION

TC1072

2

5

4

V_OUT

ERROR

4

Bypass

5

GND

Bypass

ERROR

C

BYPASS

6

470pF

TC1072

(SOT-23A-6*)

3

SHDN

ERROR

TOP VIEW

2

3

1

V_IN

GND

SHDN

Shutdown Control

(from Power Control Logic)

NOTE: *SOT-23A-6 is equivalent to the EIAJ (SC-74A)

1

TelCom Semiconductor reserves the right to make changes in the circuitry and specifications ot its devices.

TC1072-01 6/16/97

PRELIMINARY INFORMATION

50mA CMOS LDO WITH SHUTDOWN,

ERROR OUTPUT AND V_REFBYPASS

TC1072

*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 in the operational sections of the specifications is not

implied. Exposure to absolute maximum rating conditions for extended

periods may affect device reliability.

ABSOLUTE MAXIMUM RATINGS*

Input Voltage .................................................................7V

Output Voltage .................................. (– 0.3) to (V_IN+ 0.3)

Power Dissipation ....................Internally Limited (Note 7)

Operating Temperature .................... – 40°C < T_J< 125°C

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

Maximum Voltage on Any Pin ........... V_IN+ 0.3V to – 0.3V

Lead Temperature (Soldering, 10 Sec.)................ +260°C

ELECTRICAL CHARACTERISTICS: V_IN= V_OUT+ 1V, I_L= 0.1mA, C_L= 3.3µF, SHDN > V_IH, T_A= 25°C, unless other-

wise specified.BOLDFACE type specifications apply for junction temperatures of

– 40°C to +125°C.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

V_IN

Input Operating Voltage

Maximum Output Current

Output Voltage

—

50

—

6.5

V

mA

I_OUT

—

MAX

V_OUT

Note 1

Note 2

V_R– 2.5%

V

_R±0.5% V_R+ 2.5%

V

TC V_OUT

V_OUTTemperature Coefficient

—

ppm/°C

40

∆V_OUT/∆V_IN

∆V_OUT/V_OUT

Line Regulation

Load Regulation

(V_R+ 1V) < V_IN< 6V

—

0.05

0.5

—

%/V

%

I_L= 0.1mA to I_OUT

(Note 3)

MAX

V_IN– V_OUT

Dropout Voltage (Note 4)

I_L= 0.1mA

I_L= 20mA

I_L= 50mA

(Note 4)

—

5

65

95

—

mV

I_GND

I_IN

Ground Pin Current

I_L= I_OUT

—

0

—

µA

_MAX,(Note 5)

Supply Current

SHDN = V_IH, I_L= 0

SHDN = 0V

50

I_INSD

PSRR

Shutdown Supply Current

Power Supply Rejection Ratio

Output Short Circuit Current

Thermal Regulation

Output Noise

—

0.05

—

µA

F_RE≤ 1kHz

64

dB

I_OUT

V_OUT= 0V

Note 6

200

0.04

260

450

—

mA

SC

∆V_OUT/∆P_D

%/W

nV/√Hz

eN

I_L= I_OUT

—

MAX

470pF from Bypass to GND

SHDN Input

V_IH

V_IL

SHDN Input High Threshold

SHDN Input Low Threshold

V_IN= 2.5V to 6.5V

45

—

%V_IN

15

2

TC1072-01 6/16/97

PRELIMINARY INFORMATION

50mA CMOS LDO WITH SHUTDOWN,

ERROR OUTPUT AND V_REFBYPASS

TC1072

ELECTRICAL CHARACTERISTICS: V_IN= V_OUT+ 1V, IL = 0.1mA, CL = 3.3µF, SHDN > V_IH, T_A= 25

°C, unless otherwise noted.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

ERROR Open Drain Output

V_MIN

V_OL

Minimum Operating Voltage

1.0

—

400

—

V

mV

V

Output Logic Low Voltage

ERROR Threshold Voltage

ERROR Positive Hysteresis

1mA Flows to ERROR

See Figure 2

Note 8

V_TH

0.95 x V_R

50

V_HYS

—

mV

NOTES: 1. V_Ris the regulator output voltage setting. V_R= 2.5V, 2.7V, 3.0V, 3.2V, 3.3V, 3.8V 5.0V.

2. TC V_OUT(V_OUTV_OUT

_MIN) x 10⁶

V_OUTx ∆T

=

MAX –

3. Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a load

range from 0.1mA to the maximum specified output current. Changes in output voltage due to heating effects are covered by the

thermal regulation specification.

4. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value.

5. Ground pin current is the regulator pass transistor gate current. The total current drawn from the input supply is the sum of the load

current, ground current and supply current (i.e. I_IN= I_SUPPLY+ I_GND+ I_LOAD).

6. Thermal Regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load

or line regulation effects. Specifications are for a current pulse equal to I_LMAXat V_IN= 6V for T = 10msec.

7. The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the

thermal resistance from junction-to-air (i.e. T_A, T_J, q_JA). Exceeding the maximum allowable power dissipation causes the device to

initiate thermal shutdown. Please see Thermal Considerations section of this data sheet for more details.

8. Hysteresis voltage is referenced by V_R.

PIN DESCRIPTION

Pin No.

(SOT-23A-6)

Symbol

Description

1

2

3

V_IN

Unregulated supply input.

Ground terminal.

GND

SHDN

Shutdown control input. The regulator is fully enabled when a logic high is applied to this

input. The regulator enters shutdown when a logic low is applied to this input. During

shutdown, output voltage falls to zero and supply current is reduced to 0.05 microamp

(typical).

4

ERROR

Out-of-Regulation Flag. (Open drain output). This output goes low when V_OUTis out-of-

tolerance by approximately – 5%.

5

6

Bypass

V_OUT

Reference bypass input. Connecting a 470pF to this input further reduces output noise.

Regulated voltage output.

3

TC1072-01 6/16/97

PRELIMINARY INFORMATION

50mA CMOS LDO WITH SHUTDOWN,

ERROR OUTPUT AND V_REFBYPASS

TC1072

DETAILED DESCRIPTION

The TC1072 is a precision fixed output voltage regula-

tor. (If an adjustable version is desired, please see the

TC1070 or TC1071 data sheets.) Unlike the bipolar regula-

tors, the TC1072 supply current does not increase with load

current. In addition, V_OUTremains stable and within regula-

tion at very low load currents (an important consideration in

RTC and CMOS RAM battery back-up applications).

Figure 1 shows a typical application circuit. The regula-

tor is enabled any time the shutdown input (SHDN) is at or

above V_IH, and shutdown (disabled) when SHDN is at or

below V_IL. SHDN may be controlled by a CMOS logic gate,

or I/O port of a microcontroller. If the SHDN input is not

required, it should be connected directly to the input supply.

While in shutdown, supply current decreases to 0.05µA

(typical) and V_OUTfalls to zero volts and ERROR is open-

circuited.

V_OUT

HYSTERESIS (V_HYS

)

V_TH

ERROR

V_IH

V_OL

Figure 2. ERROR Output Operation

Output Capacitor

A 1µF (min) capacitor from V_OUTto ground is recom-

mended. The output capacitor should have an effective

series resistance of 5Ω or less, and a resonant frequency

above1MHz.A1µFcapacitorshouldbeconnected fromV_IN

to GND if there is more than 10 inches of wire between the

regulator and the AC filter capacitor, or if a battery is used as

thepowersource. Aluminumelectrolyticortantalumcapaci-

tor types can be used. (Since many aluminum electrolytic

capacitors freeze at approximately – 30°C, solid tantalums

arerecommendedforapplicationsoperatingbelow –25°C.)

When operating from sources other than batteries, supply-

noise rejection and transient response can be improved by

increasing the value of the input and output capacitors and

employing passive filtering techniques.

V

OUT

IN

1µF

C1

BATTERY

Bypass

TC1072

GND

C3, 470pF

+

V

SHDN

ERROR

R1

1M

Shutdown Control

(to CMOS Logic or Tie

C2 Requires Only

if ERROR is used as a

Processor RESET Signal

(See Text)

BATTLOW

or RESET

to V if unused)

IN

0.2µF

C2

Bypass Input

Figure 1. Typical Application Circuit

A 470pF capacitor connected from the Bypass input to

ground reduces noise present on the internal reference,

which in turn significantly reduces output noise. If output

noise is not a concern, this input may be left unconnected.

Larger capacitor values may be used, but results in a longer

time period to rated output voltage when power is initially

applied.

ERROR Open Drain Output

ERROR is driven low whenenver V_OUTfalls out of

regulation by more than – 5% (typical). The condition my be

caused by low input voltage, output current limiting, or

thermal limiting. The ERROR output voltage value (e.g.

ERROR=V_OLat4.75(typ)fora5.0Vregulatorand2.85(typ)

for a 3.0V regulator). ERROR ouput operation is shown in

Figure 2.

Thermal Considerations

Thermal Shutdown

Note that ERROR is active when V_OUTfalls to V_TH, and

inactive when V_OUTrises above V_TH= V_HYS.

Integrated thermal protection circuitry shuts the regula-

tor off when die temperature exceeds 160°C. The regulator

remains off until the die temperature drops to approximately

150°C.

As shown in Figure 1, ERROR can be used as a battery

low flag, or as a processor RESET signal (with the addition

of timing capacitor C2). R1 x C2 should be chosen to

maintain ERROR below V_IHof the processor RESET input

for at least 200msec to allow time for the system to stabilize.

Pull-up resistor R1 can be tied to V_OUT, V_INor any other

voltage less than (V_IN+0.3V).

Power Dissipation

The amount of power the regulator dissipates is prima-

rilyafunctionofinputandoutputvoltage,andoutputcurrent.

4

TC1072-01 6/16/97

PRELIMINARY INFORMATION

50mA CMOS LDO WITH SHUTDOWN,

ERROR OUTPUT AND V_REFBYPASS

TC1072

The following equation is used to calculate worst case

actual power dissipation:

= (125 – 55)

220

P_{D ≈}(V_IN

V_OUT

I_LOAD

)

MIN MAX

= 318mW

–

MAX

Where:

In this example, the TC1072 dissipates a maximum of

only 60mW; far below the allowable limit of 318mW. In a

similar manner, Equation 1 and Equation 2 can be used to

calculate maximum current and/or input voltage limits.

P_D= Worst case actual power dissipation

= Maximum voltage on V_IN

V_IN

MAX

V_OUT

= Minimum regulator output voltage

MIN

I_LOADMAX= Maximum output (load) current

Layout Considerations

Equation 1.

The primary path of heat conduction out of the package

is via the package leads. Therefore, layouts having a

ground plane, wide traces at the pads, and wide power

supply bus lines combine to lower θ_JAand therefore in-

crease the maximum allowable power dissipation limit.

The maximumallowable power dissipation (Equation 2)

is a function of the maximum ambient temperature (T_AMAX),

the maximum allowable die temperature (125°C) and the

thermal resistance from junction-to-air (θ_JA). SOT-23A-6

packag has a θ_JAof approximately 220°C/Watt when

mounted on a single layer FR4 dielectric copper clad PC

board.

P_{D MAX}(T_JMAX– T_A

)

=

MAX

θ_JA

Where all terms are previously defined.

Equation 2.

Equation 1 can be used in conjunction with Equation 2

to ensure regulator thermal operation is within limits. For

example:

Given:

V_IN

V_OUT

= 3.0V ±10%

= 2.7V ±0.5V

MAX

MIN

I_LOAD= 40mA

T_AMAX= 55°C

Find: 1. Actual power dissipation

2. Maximum allowable dissipation

Actual power dissipation:

P_{D ≈}(V_IN

V_OUT

I_LOAD

)

MIN MAX

–

MAX

= [(3.0 x 1.05) – (2.7 x .995)]40 x 10^–3

= 18.5mW

Maximum allowable power dissipation:

P_DMAX= (T_JMAX– T_AMAX

)

θ_JA

5

TC1072-01 6/16/97

PRELIMINARY INFORMATION

50mA CMOS LDO WITH SHUTDOWN,

ERROR OUTPUT AND V_REFBYPASS

TC1072

ቢ & ባ = part number code + temperature range and voltage

SOT-23A-6

TC1072 (V)

Code

2.5

2.7

3.0

3.3

5.0

E1

E2

E3

E4

E6

ቤ represents year and quarter code

ብ represents lot ID number

PACKAGE DIMENSIONS

SOT-23A-6*

.069 (1.75)

.059 (1.50)

.118 (3.00)

.102 (2.60)

.020 (0.50)

.014 (0.35)

.037 (0.95)

REFERENCE

.118 (3.00)

.110 (2.80)

.057 (1.45)

.035 (0.90)

.008 (0.20)

.004 (0.09)

10° MAX.

.006 (0.15)

.000 (0.00)

.022 (0.55)

.014 (0.35)

Dimensions: inches (mm)

NOTE: *SOT-23A-6 is equivalent to the EIAJ (SC-74A)

Sales Offices

TelCom Semiconductor

Austin Product Center

9101 Burnet Rd. Suite 214

Austin, TX 78758

TelCom Semiconductor H.K. Ltd.

10 Sam Chuk Street, 6/F

San Po Kong

Kowloon

Hong Kong

TelCom Semiconductor

1300 Terra Bella Avenue

P.O. Box 7267

Mountain View, CA 94039-7267

TEL: 415-968-9241

TEL: 512-873-7100

FAX: 512-873-8236

TEL: 852-2324-0122

FAX: 852-2354-9957

FAX: 415-967-1590

E-Mail: liter@c2smtp.telcom-semi.com

6

TC1072-01 6/16/97

Printed in the U.S.A.

PRELIMINARY INFORMATION

100mA CMOS LDO WITH SHUTDOWN,

ERROR OUTPUT AND V_REFBYPASS

TC1073

100mA CMOS LDO WITH SHUTDOWN, ERROR OUTPUT AND V_REFBYPASS

FEATURES

GENERAL DESCRIPTION

■ Zero Ground Current for Longer Battery Life!

■ Very Low Dropout Voltage

■ Guaranteed 100mA Output

■ High Output Voltage Accuracy

■ Standard or Custom Output Voltages

■ Power-Saving Shutdown Mode

■ ERROR Ouput can be Used as a Low Battery

Detector, or Processor Reset Generator

■ Bypass Input for Ultra-quiet Operation

■ Over-Current and Over-Temperature Protection

■ Space-Saving SOT-23A-6 Package

■ Pin Compatible Upgrades for Bipolar Regulators

The TC1073 is a high accuracy (typically ±0.5%) CMOS

upgrade for older (bipolar) low dropout regulators such as

the LP2980. Designed specifically for battery-operated sys-

tems, the TC1073’s CMOS construction eliminates wasted

ground current, significantly extending battery life. Total

supply current is typically 50µA at full load (20 to 60 times

lower than in bipolar regulators!).

TC1073 key features include ultra low noise operation

(plus optional Bypass input); very low dropout voltage (typi-

cally 200mV at full load) and internal feed-forward compen-

sation for fast response to step changes in load. An error

output (ERROR) is asserted when the TC1073 is out-of-

regulation (due to a low input voltage or excessive output

current). ERRORcanbeusedasalowbatterywarningoras

a processor RESET signal (with the addition of an external

RC network). Supply current is reduced to less than 1µA,

andbothV_OUTandERRORaredisabledwhentheshutdown

input is low. The TC1073 incorporates both over-tempera-

ture and over-temeprature protection.

APPLICATIONS

■ Battery Operated Systems

■ Portable Computers

■ Medical Instruments

■ Instrumentation

■ Cellular / GSM / PHS Phones

■ Linear Post-Regulator for SMPS

■ Pagers

The TC1073 is stable with an output capacitor of only

1µF and has a maximum output current of 100mA. For

higher output current versions, please see the TC1107,

TC1108 (I_OUT= 300mA) data sheets.

TYPICAL APPLICATION

ORDERING INFORMATION

Output

Junction

1M

Part No.

Voltage** Package

Temp. Range

1

TC1073-2.5VCH

TC1073-2.7VCH

TC1073-3.0VCH

TC1073-3.3VCH

TC1073-5.0VCH

2.5V

2.7V

3.0V

3.3V

5.0V

SOT-23A-6* – 40°C to +125°C

6

V

OUT

IN

OUT

1µF

TC1073

2

3

5

4

GND

Bypass

ERROR

C

NOTE: *SOT-23A-6 is equivalent to the EIAJ (SC-74)

** Other output voltages available. Please contact TelCom

Semiconductor for details

BYPASS

470pF

SHDN

ERROR

PIN CONFIGURATION

V_OUT

ERROR

4

Bypass

5

6

Shutdown Control

(from Power Control Logic)

TC1073

(SOT-23A-6*)

TOP VIEW

2

3

1

V_IN

GND

SHDN

NOTE: *SOT-23A-6 is equivalent to the EIAJ (SC-74)

1

TelCom Semiconductor reserves the right to make changes in the circuitry and specifications ot its devices.

TC1073-01 6/5/97

PRELIMINARY INFORMATION

100mA CMOS LDO WITH SHUTDOWN,

ERROR OUTPUT AND V_REFBYPASS

TC1073

*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 in the operational sections of the specifications is not

implied. Exposure to absolute maximum rating conditions for extended

periods may affect device reliability.

ABSOLUTE MAXIMUM RATINGS*

Input Voltage .................................................................7V

Output Voltage .................................. (– 0.3) to (V_IN+ 0.3)

Power Dissipation ....................Internally Limited (Note 7)

Operating Temperature .................... – 40°C < T_J< 125°C

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

Maximum Voltage On Any Pin .......... V_IN+ 0.3V to – 0.3V

ELECTRICAL CHARACTERISTICS: V_IN= V_OUT+ 1V, I_L= 0.1mA, C_L= 3.3µF, SHDN > V_IH, T_A= 25

°C, unless otherwise noted.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

V_IN

Input Operating Voltage

Maximum Output Current

Output Voltage

Note 9

—

100

—

6.5

V

mA

I_OUT

Note 9

—

MAX

V_OUT

Notes 1, 9

Note 2, 9

V_R– 2.5%

V

_R±0.5% V_R+ 2.5%

V

TC V_OUT

V_OUTTemperature Coefficient

20

—

ppm/°C

40

∆V_OUT/∆V_IN

∆V_OUT/V_OUT

Line Regulation

Load Regulation

(V_R+ 1V) < V_IN< 6V

—

0.05

0.5

—

%

I_L= 0.1mA to I_OUT

(Note 3)

MAX

V_IN– V_OUT

Dropout Voltage (Note 4)

I_L= 0.1mA

I_L= 20mA

I_L= 50mA

I_L=100mA

(Note 4)

—

20

70

100

200

—

mV

I_GND

I_IN

Ground Pin Current

I_L= I_OUT

—

0

—

80

0.05

—

µA

_MAX,(Note 5, 9)

Supply Current

SHDN = V_IH, I_L= 0

SHDN = 0V

—

50

—

I_INSD

R_OUT

PSRR

Shutdown Supply Current

Output Resistance during Shutdown

Power Supply Rejection Ratio

Output Short Circuit Current

Thermal Regulation

—

µA

SHDN < V_IL

100 x V_R

160 x V_R

64

kΩ

F_RE≤ 1kHz

—

dB

I_OUT

V_OUT= 0V

Note 6

300

500

—

mA

%/W

°C

SC

∆V_OUT/∆P_D

T_SD

0.04

160

Thermal Shutdown Die Temperature

Thermal Shutdown Hysteresis

Output Noise

—

∆T_SD

10

—

°C

eN

I_L= I_OUT

260

—

nV/√Hz

MAX

470pF from Bypass to GND

SHDN Input

V_IH

V_IL

SHDN Input High Threshold

SHDN Input Low Threshold

V_IN= 2.5V to 6.5V

45

—

%V_IN

15

2

TC1073-01 6/5/97

PRELIMINARY INFORMATION

100mA CMOS LDO WITH SHUTDOWN,

ERROR OUTPUT AND V_REFBYPASS

TC1073

ELECTRICAL CHARACTERISTICS: V_IN= V_OUT+ 1V, IL = 0.1µA, CL = 3.3µF, SHDN > V_IH, T_A= 25

°C, unless otherwise noted.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

ERROR Open Dranin Output

V_MIN

V_OL

Minimum Operating Voltage

1.0

—

400

—

V

mV

V

Output Logic Low Voltage

ERROR Threshold Voltage

ERROR Positive Hysteresis

1mA Flows to ERROR

See Figure 2

Note 8

V_TH

0.95 x V_R

50

V_HYS

—

mV

NOTES: 1. V_Ris the regulator output voltage setting. (V_R= 2.5V, 2.7V, 3.0V, 3.3V, 5.0V).