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TS2951ACSRL: Description150mA Ultra Low Dropout Voltage Regulator; File Size149KB，8 Pages; ManufacturerTaiwan Semiconductor; Websitehttp://www.taiwansemi.com/

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TS2951ACSRL Overview

150mA Ultra Low Dropout Voltage Regulator

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TS2951/A

150mA Ultra Low Dropout Voltage Regulator

SOP-8

Pin Definition:

1. Output

8. Input

2. Sense

3. Shutdown

4. Ground

7. FB

6. Voltage tap

5. Error flag

General Description

The TS2951/A are low power voltage regulators. These devices are excellent choice for use in battery-powered

applications such as cordless telephone, radio control systems, and portable computers.

The TS2951/A is features very low quiescent current (75uA Typ.) and very low drop output voltage (Typ. 40uV at

light load and 380 mV at 100 mA). This includes a tight initial tolerance of 1% (A version), extremely good load

and line regulation 0.05% typ. and very low output temperature coefficient, making the TS2951/A useful as a

low-power voltage reference.

TS2951/A have other key additional feature. The error flag output feature is used as power-on reset for warn of a

low output voltage, due to following batteries on input. The logic-compatible shutdown input which enable the

regulator to be switched on/off. The regulator output voltage may be pin-strapped for a 5.0 & 3.3 & 3.0 of

programmed from 1.24V to 29V with external pair of resistors. Using of as design, processing and testing

techniques make TS2951/A superior over similar products.

Features

●

Output voltage available in 5V & 3.3V

Extremely low quiescent current

Low dropout voltage

Extremely tight load and line regulation

Very low temperature coefficient

Need only 1uF for stability

Use as Regulator or Reference

Stable with low-ESR output capacitors

Current and thermal limiting

Error Flag warns of output dropout

Logic-Controlled electronic shutdown

Additional voltage tap

Output voltage sense

Output programmable from 1.24 to 29V

Ordering Information

Part No.

TS2951CSxx RL

TS2951ACSxx RL

Package

SOP-8

Packing

2.5Kpcs / 13” Reel

Note: Where

denotes voltage option, available are

50=

5.0V

33=

3.3V

30=

3.0V

Application

●

Battery powered systems

SMPS Post-Regulator

Voltage Reference

Portable consumer equipment

Absolute Maximum Rating

Parameter

Input Supply Voltage

Feedback Input Voltage

Shutdown Input Voltage

Error Comparator Output Voltage

Power Dissipation

Operating Junction Temperature Range

Storage Temperature Range

Lead Temperature (Soldering 5 second)

Thermal Resistance Junction to Ambient

Thermal Resistance Junction to Case

1/10

Symbol

Vfeedback

Vshutdown

Verror

STG

RӨ

Limit

- 0.3 ~ +30

- 1.5 ~ +30

- 0.3 ~ +30

Internally Limited

- 40 ~ +125

-65 ~ +150

260

180

Unit

C/W

Version: D11

TS2951/A

150mA Ultra Low Dropout Voltage Regulator

NOTE:

Output voltage temperature coefficients defined as the worst case voltage change divided by the total

temperature range.

Unless otherwise specified all limits guaranteed for T

= 25 C, Vin= 6V, I

= 100uA and C

= 100uF. Additional

conditions for the 8-pin versions are feedback tied to 5V, 3.3V & 3V tap output Sense (Vout = 5V, 3.3V & 3V) and

shutdown

≤

0.8V.

Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in

output voltage due to heating effects are covered under the specification for thermal regulation.

Line regulation for the TS2951 is tested at 85 C for I

= 1mA.For I

= 100uA and Tj= 125 C, line regulation is

guaranteed by design to 0.2%.

Dropout Voltage is defined as the input to output differential at which the output voltage drops 100mV below its

nominal value measured at 1V differential at very low value of programmed output voltage, the minimum input

supply voltage of 2V (2.3V over temperature) must be taken in to account.

Vref

≤

Vout

≤

(Vin-1V), 2.3≤ Vin≤ 30V, 100uA≤ I

≤

100mA, Tj

≤

Tj(max)

Reference voltage temperature coefficient is defined as the worst case voltage change divided by the total

temperature range.

Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the

nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change,

multiply by the error amplifier gain= Vout / Vref = (R1+R2) / R2. For example, at a programmed output voltage of

5V, the Error output is guaranteed to go low when the output drops by 95 mV X 5V / 1.250 = 384mV. Thresholds

remain constant as a percent of Vout as Vout is varied with the dropout warning occurring at typically 5% below

nominal, 7.5% guaranteed.

Application Hints

External Capacitors

For the stability of the TS2951/A is requires a 1.0uF(0.22uF is recommended for 3.0V & 3.3V) or greater capacitor

between output and ground. Oscillation could occur without this capacitor. The tantalum or aluminum electrolytic

works fine; could use the film type work but are not cost efficient. For the operation of below -25 C solid tantalum is

recommended since the many aluminum type have electrolytes the freeze at about -30 C. The ESR of about 5 or

less and resonant frequency above 500KHz are most important parameter in the value of Capacitor. The

Capacitors value can be increased without any limit. At lower values of output current, less output capacitance is

required for stability. For the currents below 10mA the value of capacitor can be reduce to 0.33uF and 0.1uF for

1mA. More output capacitance needed for the 8-pin version at voltage below 5V since it runs the error amplifier at

lower gain. At worst case 3.3uF or greater must be used for condition of 100mA load at 1.250V output.

The TS2951/A is not like other low dropout regulators will remain stable and regulation with no load in addition to

the internal voltage divider. This feature very important in application, it is like CMOS RAM keep-alive. The

TS2951/A output voltage is set with minimum load of 1uA and external resistors.

If at the input ofTS2951/A connected to battery or between AC filter capacitor and input is 10 inches wire then 1uF

tantalum or aluminum electrolytic capacitor should be connected between input and ground. Instability can occur if

stray capacitor to feedback terminal pin 7 of the TS2951/A. This could cause more problems when using higher

value of external to set the output voltage. To fix this problem the 100pF capacitor between output and feedback

and increasing output capacitance to 3.3uF.

3/10

Version: D11

TS2951/A

150mA Ultra Low Dropout Voltage Regulator

Application Hints

(continued)

Reducing Output Noise

It could be an advantage to reduce the AC noise present at the output. One method is to reduce the regulator

bandwidth by increasing the value of the output capacitor. This is the only method that noise could reduce on the

TS2951/A, but is relatively inefficient, as increasing capacitor from 1uF to 220uF only decreases the noise from

430uV to 160uVrms for a 100KHz bandwidth at 5V output. Noise could be also reduced by fourfold by a bypass

capacitor across R1 since it reduces the high frequency gain from 4 to unity.

Pick Cbypass= 1 / 2πR1 * 200Hz or choose 0.01uF when doing this, the output capacitor must be increased to

3.3uF to maintain stability. These change the output noise from 430uV/rms for a 100 kHz bandwidth 5V, 3.3V & 3V

output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are

more dramatic higher output voltage.

Error Detection Comparator Output

The Compactor produces a logic low output whenever the TS2951/A output falls of regulation by more than around

5%. This is around 60 mV offset divided by the 1.235 reference voltage. Thus trip remains 5% below nominal

regardless of the programmed output voltage of the regulator. The Figure 1 shows the timing diagram depicting the

ERROR signal and the regulator output voltage as the TS2951/A input is ramped up and down. The ERROR signal

becomes low at around 1.3V input,it goes high around 5V input (input voltage at which Vout=4.75V). The TS2951/A

dropout voltage depending on the load, the input voltage trip point around 5V will vary with load current. The output

voltage trip point is around 4.75V, it does not change with load. The error comparator has an open-collector output

which requires an external pull-up resistor. Depending on the system requirement, the resistor maybe returned to 5

or 3.3V output or other supply voltage depending to the system requirements. For determining the size of the

resistor, note that the output is sinking 400uA, this value adds to battery drain in a low better condition,

recommended values 100K to 1M . If the output is unused this resistor is not required.

Programming The output Voltage

The TS2951/A output voltage is programmable for any value from it reference voltage of 1.235V and it maximum

rating of 30V. For example for 5 volt needs to pin-strapped and using the internal voltage divider by tying pin 1 to 2

and pin 7 to pin 6. Refer to Figure 2, there are two external resistor required for this programming. Refer to the

below equation for the programming the output voltage:

Volt=Vref x (1+R1\R2)+I

* R1

The Vref is 1.235V and I

is the feedback bias current, nominally -20nA. The minimum recommended load current

of 1uA forces an upper limit of 1.2M on value of R2, If no load presented the I

produces error of typically 2% in

Vout which maybe eliminated at room temperature by trimming R1. To improve the accuracy chooses the value of

R2=100K and this reduces the error by 0.17% and increases the resistor program current by 12uA. The TS2951/A

typically draw 60uA at no load with pin 2 open-circuit, and this value does not look much.

4/10

Version: D11

TS2951ACSRL Related Products

	TS2951ACSRL	TS2951	TS2951CSRL
Description	150mA Ultra Low Dropout Voltage Regulator	150mA Ultra Low Dropout Voltage Regulator	150mA Ultra Low Dropout Voltage Regulator

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