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TS39100_08: Description1A Ultra Low Dropout Voltage Regulator; File Size340KB，7 Pages; ManufacturerTaiwan Semiconductor; Websitehttp://www.taiwansemi.com/

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1A Ultra Low Dropout Voltage Regulator

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TS39100

1A Ultra Low Dropout Voltage Regulator

SOT-223

TO-252

(DPAK)

Pin Definition:

1. Input

2. Ground (tab)

3. Output

General Description

The TS39100 are 1A ultra low dropout linear voltage regulators that provide low voltage, high current output from an

extremely small package. These regulators offers extremely low dropout (typically 400mV at 1A) and very low

ground current (typically 12mA at 1A).

The TS39100 are fully protected against over current faults, reversed input polarity, reversed lead insertion, over

temperature operation, positive and negative transient voltage spikes, logic level enable control and error flag which

signals whenever the output falls out of regulation.

Features

●

Dropout voltage typically 0.4V @Io=1A

Output Current up to 1A

Low Ground Current

Extremely Fast Transient Response

Reversed Leakage & Reverse Battery Protection

Current Limit & Thermal Shutdown Protection

Ordering Information

Part No.

Package

Packing

TS39100CWxx RP

SOT-223 2.5Kpcs / 13” Reel

TS39100CWxx RPG

SOT-223 2.5Kpcs / 13” Reel

TS39100CPxx RO

TO-252

2.5Kpcs / 13” Reel

TS39100CPxx ROG

TO-252

2.5Kpcs / 13” Reel

Note: Where

denotes voltage option, available are

18=1.8V, 25=2.5V, 33=3.3V, 50=5.0V

“G” denote for Halogen Free

Application

●

ULDO Linear Regulator for PC add-in Cards

PowerPC Power Supplies

Battery Powered Equipment

Consumer and Personal Electronics

High Efficiency Linear Power Supplies

SMPS Post Regulator and DC to DC Modules

High-efficiency Post Regulator for Switching Supply

Portable Application

Low-Voltage microcontrollers and Digital Logic

Typical Application Circuit

Absolute Maximum Rating

(Note 1)

Parameter

Supply Voltage

Operation Input Voltage

Power Dissipation (Note 4)

Operating Junction Temperature Range

Storage Temperature Range

Lead Soldering Temperature (260 C)

ESD

Symbol

(operate)

STG

Value

-20V ~ +20

+2.25 ~ +16

Internally Limited

-40 ~ +125

-65 ~ +150

(Note 3)

Units

1/7

Version: B08

TS39100

1A Ultra Low Dropout Voltage Regulator

Functional Diagram

Application Information

The TS39100 are high performance with low dropout voltage regulator suitable for moderate to high current and

voltage regulator application. Its 630mV dropout voltage at full load and over temperature makes it especially valuable

in battery power systems and as high efficiency noise filters in post regulator applications. Unlike normal NPN

transistor design, where the base to emitter voltage drop and collector to emitter saturation voltage limit the minimum

dropout voltage, dropout performance of the PNP output of these devices is limited only by low V

saturation voltage.

The TS39100 is fully protected from damage due to fault conditions. Linear current limiting is provided. Output current

during overload conditions is constant. Thermal shutdown the device when the die temperature exceeds the maximum

safe operating temperature. Transient protection allows device survival even when the input voltage spikes above and

below nominal. The output structure of these regulators allows voltages in excess of the desired output voltage to be

applied without reverse current flow.

Output Capacitor Requirement

The TS39100 requires an output capacitor to maintain stability and improve transient response is necessary. The

value of this capacitor is dependent upon the output current, lower currents allow smaller capacitors. TS39100 output

capacitor selection is dependent upon the ESR of the output capacitor to maintain stability. When the output capacitor

is 10uF or greater, the output capacitor should have an ESR less than 2Ω. This will improve transient response as well

as promote stability. Ultra low ESR capacitors (<100mΩ), such as ceramic chip capacitors, may promote instability.

These very low ESR levels may cause an oscillation and/or under damped transient response. A low ESR solid

tantalum capacitor works extremely well and provides good transient response and stability over temperature

aluminum electrolytes can also be used, as long as the ESR of the capacitor is <2Ω. The value of the output capacitor

can be increased without limit. Higher capacitance values help to improve transient response and ripple rejection and

reduce output noise.

Input Capacitor Requirement

An input capacitor of 1uF or greater is recommended when the device is more than 4” away from the bulk AC supply

capacitance or when the supply is a battery. Small, surface mount, ceramic chip capacitors can be used for bypassing.

Larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving the integrity

of the output voltage.

Minimum Load Current

The TS39100 is specified between finite loads. If the output current is too small leakage currents dominate and the

output voltage rises. A 10mA minimum load current is necessary for proper regulation.

3/7

Version: B08

TS39100

1A Ultra Low Dropout Voltage Regulator

Application Information (Continue)

Transient Response and 3.3V to 2.5V or 2.5V to 1.8V Conversion

TS39100 has excellent transient response to variations in input voltage and load current. The device have been

designed to respond quickly to load current variations and input voltage variations. Large output capacitors are not

required to obtain this performance. A standard 10uF output capacitor, preferably tantalum, is all that is required.

Larger values help to improve performance even further. By virtue of its low dropout voltage, this device does not

saturate into dropout as readily as similar NPN base designs. When converting from 3.3V to 2.5V or 2.5V to 1.8V, the

NPN based regulators are already operating in dropout, with typical dropout requirements of 1.2V or greater,. To

convert down to 2.5V or 1.8V without operating in dropout, NPN based regulators require an input voltage of 3.7V at

the very least. The TS39100 will provide excellent performance with an input as low as 3.0V or 2.5V respectively. This

gives the PNP based regulators a distinct advantage over older, NPN based linear regulators.

Copper area lay out information

Determine the power dissipation requirements for the design along with the maximum ambient temperature at which

the device will be operated. Refer to power dissipation with copper area curve, which shows safe operating curves for

three different ambient temperatures with 25 C, 50 C, 85 C. From these curves, the minimum amount of copper can

be determined by knowing the maximum power dissipation required.

= (V

- V

OUT

) * I

OUT

+ V

* I

GND

If we used a 5.0V output device and a 6V input at an output current of 350mA, then the power dissipation is as follows:

= (6.0V- 5.0V) * 350mA + 5V * 4mA

= 350mW + 20mW

= 370mW

If the maximum ambient temperature is 85 C and the power dissipation is as above 375mW, the curve is shows that

the required area of copper is 80mm .

4/7

Version: B08

TS39100_08 Related Products

	TS39100_08	TS39100CPRO	TS39100CPROG	TS39100CWRP	TS39100CWRPG
Description	1A Ultra Low Dropout Voltage Regulator	1A Ultra Low Dropout Voltage Regulator	1A Ultra Low Dropout Voltage Regulator	1A Ultra Low Dropout Voltage Regulator	1A Ultra Low Dropout Voltage Regulator

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