TelCom Semiconductor Inc TC1015-5.0VCT, TC1015-3.3VCT, TC1015-2.7VCT, TC1015-3.0VCT, TC1015-2.5VCT, TC1014-5.0VCT, TC1014-3.0VCT, TC1014-3.3VCT, TC1014-2.7VCT, TC1014-2.5VCT Datasheet

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TelCom Semiconductor Inc TC1015-5.0VCT, TC1015-3.3VCT, TC1015-2.7VCT, TC1015-3.0VCT, TC1015-2.5VCT, TC1014-5.0VCT, TC1014-3.0VCT, TC1014-3.3VCT, TC1014-2.7VCT, TC1014-2.5VCT Datasheet

50mA CMOS LDO WITH SHUTDOWN

PRELIMINARY INFORMATION

AND REFERENCE BYPASS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TC1014

 

50mA CMOS LDO WITH SHUTDOWN AND REFERENCE BYPASS

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

Reference Bypass Input for Ultra Low-Noise Operation

Over-Current and Over-Temperature Protection

Space-Saving SOT-23A-5 Package

Pin Compatible Upgrade for MIC5205 and NSC2980

APPLICATIONS

Battery Operated Systems

Portable Computers

Medical Instruments

Instrumentation

Cellular / GSM / PHS Phones

Linear Post-Regulator for SMPS

Pagers

TYPICAL APPLICATION

1

VIN

VOUT

5

VOUT

VIN

 

 

 

 

 

1 F

2

GND

TC1014

 

 

 

 

 

3

SHDN

Bypass

4

 

 

 

 

 

 

 

 

470pF

 

 

 

 

Reference

 

 

 

 

Bypass Cap

 

 

 

 

(Optional)

Shutdown Control

 

 

 

 

(from Power Control Logic)

 

 

 

 

GENERAL DESCRIPTION

The TC1014 is a high accuracy (typically ±0.5%) CMOS upgrade for older (bipolar) low dropout regulators such as the LP2980. Designed specifically for battery-operated systems, the TC1014’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!).

TC1014 key features include ultra low-noise operation (plus optional Bypass input); very low dropout voltage (typically 95mV at full load) and internal feed-forward compensation for fast response to step changes in load. Supply current is reduced to less than 1μA when the shutdown input is low. The TC1014 also incorporates both over-tempera- ture and over-current protection.

The TC1014 is stable with an output capacitor of only 1μF and has a maximum output current of 100mA. For higher output versions, please see the TC1107, TC1108, TC1173 (IOUT = 300mA) data sheets.

ORDERING INFORMATION

 

 

Output

 

Junction

Part No.

Voltage **(V)

Package

Temp. Range

 

 

 

TC1014-2.5VCT

2.5

SOT-23A-5* – 40°C to +125°C

 

 

 

TC1014-2.7VCT

2.7

SOT-23A-5* – 40°C to +125°C

 

 

 

 

TC1014-3.0VCT

3.0

SOT-23A-5*

– 40°C to +125°C

 

 

 

 

TC1014-3.3VCT

3.3

SOT-23A-5*

– 40°C to +125°C

 

 

 

 

TC1014-5.0VCT

5.0

SOT-23A-5*

– 40°C to +125°C

 

 

 

 

 

NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A)

**Other output voltages available. Please contact TelCom Semiconductor for details

PIN CONFIGURATION

VOUT Bypass

 

 

 

 

 

 

5

 

4

 

 

 

 

 

 

TC1014 (SOT-23A-5*)

1

2

3

TOP VIEW

 

VIN GND SHDN

NOTE: *SOT-23A-5 is equivalent to the EIAJ (SC-74A)

TC1014-01-6/5/97 TelCom Semiconductor reserves the right to make changes in the circuitry and1specifications to its devices.

PRELIMINARY INFORMATION

50mA CMOS LDO WITH SHUTDOWN

 

AND REFERENCE BYPASS

TC1014

 

ABSOLUTE MAXIMUM RATINGS*

Input Voltage .................................................................

7V

Output Voltage ..................................

(– 0.3) to (VIN + 0.3)

Power Dissipation ....................

Internally Limited (Note 7)

Operating Temperature ....................

– 40°C < TJ < 125°C

Storage Temperature ............................

– 65°C to +150°C

Maximum Voltage On Any Pin ..........

VIN + 0.3V to – 0.3V

*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.

ELECTRICAL CHARACTERISTICS: VIN = VOUT + 1V, IL = 100mA, CL = 3.3mF, SHDN > VIH, TA = 25°C, unless otherwise noted. Boldface type specifications apply for junction temperatures of – 40°C to +125°C.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIN

Input Operating Voltage

 

 

 

 

6.5

V

IOUTMAX

Maximum Output Current

 

 

 

 

50

mA

VOUT

Output Voltage

Note 1

VR – 2.5%

VR ±0.5%

VR + 2.5%

V

TCVOUT

VOUT Temperature Coefficient

Note 2

 

20

ppm/°C

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DVOUT/DVIN

Line Regulation

(VR + 1V) < VIN < 6V

0.01

%

 

DVOUT/VOUT

Load Regulation

IL = 1.0mA to IOUTMAX

0.5

%

 

 

 

 

 

 

(Note 3)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIN – VOUT

Dropout Voltage (Note 4)

IL = 100mA

5

mV

 

 

 

 

 

IL = 20mA

 

65

 

 

 

 

 

 

 

 

 

IL = 50mA

 

95

 

 

 

 

 

 

 

 

 

(Note 4)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IGND

Ground Pin Current

IL = IOUTMAX, (Note 5)

0

mA

IIN

Supply Current

 

 

 

= VIH, IL = 0

50

mA

SHDN

IINSD

Shutdown Supply Current

 

 

= 0V

0.05

mA

SHDN

PSRR

Power Supply Rejection Ratio

FRE £ 1kHz

64

dB

IOUTSC

Output Short Circuit Current

VOUT = 0V

200

400

mA

DVOUT/DPD

Thermal Regulation

Note 6

0.04

%/W

eN

Output Noise

IL = IOUTMAX

260

nV/Ö

 

 

Hz

 

 

 

 

 

470pF from Bypass to GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SHDN

Input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIH

SHDN

Input High Threshold

VIN = 2.5V to 6.5V

45

%VIN

VIL

 

 

Input Low Threshold

VIN = 2.5V to 6.5V

15

%VIN

SHDN

NOTES: 1. VR is the regulator output voltage setting. VR = 2.5V, 2.7V, 3.0V, 3.3V, 5.0V. 2. TCVOUT = (VOUTMAX – VOUTMIN) x 10 6

VOUT x T

3.Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a load range from 1.0mA 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 at a 1V differential.

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. IIN = ISUPPLY + IGND + ILOAD).

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 ILMAX at VIN = 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. TA, TJ, θJA). 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.

.

TC1014-01-6/5/97

2

50mA CMOS LDO WITH SHUTDOWN

PRELIMINARY INFORMATION

AND REFERENCE BYPASS

 

 

 

 

 

 

 

 

TC1014

PIN DESCRIPTION

 

 

 

 

 

 

 

 

 

 

 

 

Pin No.

 

 

 

 

 

 

 

(SOT-23A-5)

Symbol

Description

 

 

 

 

 

 

 

 

 

 

 

1

 

VIN

Unregulated supply input.

 

 

2

 

GND

Ground terminal.

 

 

 

 

 

 

 

 

3

 

 

 

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

SHDN

 

 

 

 

 

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 under 1 microamp

 

 

 

 

 

(typical).

 

 

 

 

 

 

 

 

4

Bypass

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

 

 

 

 

 

 

 

 

 

5

 

VOUT

Regulated voltage output.

 

 

DETAILED DESCRIPTION

The TC1014 is a precision fixed output voltage regulator. (If an adjustable version is desired, please see the TC1070 or TC1071 data sheets.) Unlike the bipolar regulators, the TC1014 supply current does not increase with load current. In addition, VOUT remains stable and within regulation 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 regulator is enabled any time the shutdown input (SHDN) is at or above VIH, and shutdown (disabled) when SHDN is at or

below VIL. 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 VOUT falls to zero volts.

 

VIN

VOUT

VOUT

1 F

 

 

1 F

BATTERY

GND

 

 

 

 

 

 

 

TC1014

 

 

SHDN

Bypass

 

 

 

 

470pF

 

 

 

Reference

 

 

 

Bypass Cap

 

 

 

(Optional)

Shutdown Control

 

 

(to CMOS Logic or Tie to VIN if Unused)

 

Figure 1. Typical Application Circuit

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.

Output Capacitor

A 1μF (min) capacitor from VOUT to ground is recommended. The output capacitor should have an effective series resistance of 5Ω or less, and a resonant frequency above 1MHz. A 1μF capacitor should be connected from VIN 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 the power source. Aluminum electrolytic or tantalum capacitor types can be used. (Since many aluminum electrolytic capacitors freeze at approximately – 30°C, solid tantalums are recommended for applications operating below – 25°C.) When operating from sources other than batteries, supplynoise rejection and transient response can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques.

Thermal Considerations

Thermal Shutdown

Integrated thermal protection circuitry shuts the regulator off when die temperature exceeds 160°C. The regulator remains off until the die temperature drops to approximately 150°C.

Power Dissipation

The amount of power the regulator dissipates is primarily a function of input and output voltage, and output current. The following equation is used to calculate worst case actual power dissipation:

Bypass Input

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

TC1014-01-6/5/97

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