LP2985 Datasheet, PDF(8/22 Page) National Semiconductor (TI) – Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors

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LP2985 Datasheet, PDF (8/22 Pages) National Semiconductor (TI) – Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors

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Symbol

Parameter

Conditions

IO(SC)

IO(PK)

Output Noise

Voltage (RMS)

Ripple Rejection

Short Circuit Current

Peak Output Current

BW = 300 Hz to 50 kHz,

COUT = 10 ÂµF

CBYPASS = 10 nF

f = 1 kHz, CBYPASS = 10 nF

COUT = 10 ÂµF

RL = 0 (Steady State)

(Note 9)

VOUT â¥ Vo(NOM) â5%

LP2985AI-X.X

LP2985I-X.X

Typ

(Note 6)

Units

Min

Max

Min

Max

ÂµV

400

350

Note 1: âAbsolute Maximum Ratingsâ indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating

the device outside of its rated operating conditions.

Note 2: The ESD rating of pins 3 and 4 for the SOT-23 package, or pins 5 and 2 for the micro SMD package, is 1 kV.

Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, Î¸J-

A, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using:

Where the value of Î¸J-A for the SOT-23 package is 220Â°C/W in a typical PC board mounting and the micro SMD package is 225Â°C/W. Exceeding the maximum

allowable dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.

Note 4: For 12V option, output voltage survival: -0.3 to +16V. If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2985

output must be diode-clamped to ground.

Note 5: The output PNP structure contains a diode between the VIN to VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT

will turn on this diode.

Note 6: Limits are 100% production tested at 25Â°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality

Control (SQC) methods. The limits are used to calculate National's Average Outgoing Quality Level (AOQL).

Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential.

Note 8: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.

Note 9: The LP2985 has foldback current limiting which allows a high peak current when VOUT > 0.5V, and then reduces the maximum output current as VOUT is

forced to ground (see Typical Performance Characteristics curves).

Note 10: Exposing the micro SMD device to direct sunlight will cause misoperation. See Application Hints for additional information.

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