AMS2950 datasheet(3/14 Pages) ADMOS

3 / 14 page

Advanced Monolithic Systems, Inc.

6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

AMS2950/AMS2951

ELECTRICAL CHARACTERISTICS (Note 2) (Continued)

PARAMETER

CONDITIONS

(Note 2)

AMS2950AC

AMS2951AC

Min.

Typ.

Max.

AMS2950C

AMS2951C

Min.

Typ.

Max.

Units

Dropout Voltage

(Note 5)

IL = 100µ A

IL = 150 mA

380

450

380

450

Ground Current

IL = 100 µA

IL = 150 mA

120

µA

Current Limit

Vout = 0

160

200

160

200

Thermal Regulation

(Note 13)

0.05

0.2

0.05

0.2

%/W

Output Noise,

10Hz to 100KHz

CL = 1µF

CL = 200 µF

CL = 13.3 µF

(Bypass = 0.01

µF pins 7 to

1(AMS2951))

430

160

100

430

160

100

µV rms

8-Pin Versions only

AMS2951AC

AMS2951C

Reference Voltage

1.22

1.235

1.25

1.21

1.235

1.26

Reference Voltage

Over Temperature (Note 7)

1.19

1.27

1.185

1.285

Feedback Pin Bias Current

Reference Voltage Temperature

Coefficient

( Note 12 )

ppm/°C

Feedback Pin Bias Current

Temperature Coefficient

0.1

nA/°C

Error Comparator

Output Leakage Current

= 30V

0.01

µA

Output Low Voltage

Vin = 4.5V

IOL = 400µA

150

250

150

250

Upper Threshold Voltage

(Note 6)

Lower Threshold Voltage

(Note 6)

Hysteresis

(Note 6)

Shutdown Input

Input logic Voltage

Low (Regulator ON)

High (Regulator OFF)

1.3

0.7

1.3

0.7

Shutdown Pin Input Current

(Note 3)

Vs = 2.4V

Vs = 30V

450

600

450

600

µA

Regulator Output Current in

Shutdown (Note 3)

(Note 11)

µA

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the

device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the

Electrical Characteristics tables.

Note 2: Unless otherwise specified all limits guaranteed for VIN = ( VONOM +1)V, IL = 100

µA and C

L = 1

µF for 5V versions and 2.2µF for 3V and 3.3V

versions. Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ =

°C Additional conditions for the 8-pin versions are FEEDBACK tied to V

TAP, OUTPUT tied to SENSE and VSHUTDOWN

≤ 0.8V.

Note 3: Guaranteed and 100% production tested.

Note 4: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels.

Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V

differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account.

Note 6: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at

VIN = ( VONOM +1)V. 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/1.235 = 384 mV. 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.

Note 7: Vref

≤V

out

≤ (V

in - 1V), 2.3

≤V

≤30V, 100µA≤I

≤ 150 mA, T

≤ T

JMAX.

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