LM3812M-1.0 National Semiconductor, LM3812M-1.0 Datasheet - Page 4

• Manufacturer Part Number: LM3812M-1.0
• Description: Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
• Manufacturer: National Semiconductor

www.national.com
V
V
P
Symbol
Unless otherwise specified, V
0.1 µF.
OH
OL
I
Common Device Parameters
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
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k
Note 4: The absolute maximum peak and continuous currents specified are not tested. These specifications are dependent on the
package.
Note 5: Typical numbers are at 25˚C and represent the most likely parametric norm. Specifications in standard type face are for T
type apply over full operating temperature ranges.
Note 6: Limits are 100% production tested at 25˚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 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 LM3812-7.0 and LM3813-7.0 depends on the amount of copper area under pins 1 and 2, and the layout. Please refer to the “PWM
Output and Current Accuracy” 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/˚C.
JA
= 150˚C/W (typically), junction-to-ambient.
Logic High Level for PWM
Logic Low Level for PWM
Insertion Loss
Parameter
DD
= 5.0V for the following specifications. Supply bypass capacitor is 1 µF and filter capacitor is
Load current = 1 mA, 2V
5.25V
Sink current = 1 mA, 2V
5.25V
I
SENSE
(Continued)
= 1A (Note 9)
Conditions
4
resistor into each pin.
V
V
DD
DD
V
(Note 5)
DD
0.004
0.04
Typ
− 0.05
V
J
(Note 6)
DD
JA
= 25˚C and those with boldface
Limit
, which is 150˚C/W for the S08
0.2
− 0.2
V (max)
V (min)
Units
V
V