LM2984 datasheet(5/16 Pages) NSC

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Electrical Characteristics (Continued)

IN = 14V, IOUT = 5 mA, Ibuf = 5 mA, Istby = 5 mA, Rt = 130 kΩ,Ct = 0.33 µF, Cmon = 0.47 µF, unless otherwise indicated,

Boldface type refers to limits over the entire operating temperature range, −40˚C

≤ T

A ≤ +125˚C, all other limits are for TA = TJ

= 25˚C (Note 8)

Parameter

Conditions

Typical

Limit

Units

(Note 4)

Computer Monitor/Reset Functions

Reset Rise Time

rst = 10k, Vrst = 5V, Crst ≤ 10 pF

0.60

1.00/1.50

µs

max

On/Off Switch Input

ON = 2.4V

7.5

25/25

µA

max

Current (Pin 8)

ON = 0.4V

0.01

10/10

µA

max

On/Off Switch Input

1.22

0.80/0.80

min

Threshold Voltage

1.22

2.00/2.00

max

Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating

the device beyond its specified operating ratings.

Note 3: Thermal resistance without a heatsink for junction-to-case temperature is 3˚C/W. Thermal resistance case-to-ambient is 40˚C/W.

Note 4: Tested Limits are guaranteed and 100% production tested.

Note 5: Human body model, 100 pF capacitor discharged through a 1500

Ω resistor.

Note 6: Internal comparators detect when the main regulator output (VOUT) changes from the measured output voltage (with VIN = 14V) by the specified amount,

∆VOUT High or ∆VOUT Low, and set the Reset Error Flag low. The Reset Error Flag is held low until VOUT returns to regulation. The Reset Error Flag is then allowed

to go high again after a delay set by Rtand Ct. (see application section).

Note 7: This parameter is a measure of how short a pulse can be detected at the µP Monitor Input. This parameter is primarily influenced by the value of Cmon. (See

Application Hints Section.)

Note 8: To ensure constant junction temperature, low duty cycle pulse testing is used.

Block Diagram

DS011252-2

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