LM3814 Datasheet, PDF(4/14 Page) National Semiconductor (TI) – Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output

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LM3814 Datasheet, PDF (4/14 Pages) National Semiconductor (TI) – Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output

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Common Device Parameters (Continued)

Unless otherwise specified, VDD = 5.0V for the following specifications. Supply bypass capacitor is 1ÂµF and filter capacitor is

0.1ÂµF.

Symbol

Parameter

VOH

Logic High Level for PWM

VOL

Logic Low Level for PWM

Insertion Loss

Conditions

Load current = 1mA, 2V â¤ VDD â¤

5.25V

Sink current = 1mA, 2V â¤ VDD â¤

5.25V

ISENSE = 1A (Note 9)

Typ

(Note 5)

VDD â 0.05

0.04

0.004

Limit

(Note 6)

VDD â 0.2

0.2

Units

V (min)

V (max)

â¦

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-

tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The guar-

anteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test

conditions.

Note 2: At elevated temperatures, devices must be derated based on package thermal resistance. The device in the surface-mount package must be derated at

Î¸JA= 150ËC/W (typically), junction-to-ambient.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kâ¦ resistor into each pin.

Note 4: The absolute maximum peak and continuous currents specified are not tested. These specifications are dependent on the Î¸JA, which is 150ËC/W for the S08

package.

Note 5: Typical numbers are at 25ËC and represent the most likely parametric norm. Specifications in standard type face are for TJ= 25ËC and those with boldface

type apply over full operating temperature ranges.

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

(SQC) methods. The limits are used to calculate Nationalâs Averaging Outgoing Quality Level (AOQL).

Note 7: There is a variation in accuracy over time due to thermal effects. Please refer to the PWM Output and Current Accuracy section for more information.

Note 8: The PWM accuracy for LM3814-7.0 and LM3815-7.0 depends on the amount of copper area under pins 1 and 2, and the layout. Please refer to the âPWM

Output and Current Accuracyâ section for more information.

Note 9: The tolerance of the internal lead frame resistor is corrected internally. The temperature coefficient of this resistor is 2600 ppm/ËC.

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