Rainbow Electronics LM3822 - Manual (Page 4)

Electrical Characteristics
Typical numbers are at 25˚C and represent the most likely parametric norm.
Specifications in standard type face are for T
J
= 25˚C and those with boldface type apply over full operating temperature
ranges. (Continued)
Common Device Parameters
(Continued)
Unless otherwise specified, V
DD
= 3.6V for the following specifications. Supply bypass capacitor is 1 µF and filter capacitor is
0.1 µF.
Symbol Parameter Conditions
Typ
(Note 5)
Limit
(Note 6)
Units
V
TL
Threshold Low Level for SD 1.2 V
0.7 V (max)
V
OH
Logic High Level for PWM Load current = 1 mA, 2V ≤ V
DD
≤
5.25V
V
DD
− 0.05
V
DD
− 0.2
V
V (min)
V
OL
Logic Low Level for PWM Sink current = 1 mA, 2V ≤ V
DD
≤
5.25V
0.04 V
0.2 V (max)
P
I
Insertion Loss I
SENSE
= 1A (Note 9) 0.003 Ω
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The
guaranteed 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
θ
JA = 220˚C/W (typically), junction-to-ambient.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin.
Note 4: The absolute maximum peak and continuous currents specified are not tested. These specifications are dependent on the θ
JA
, which is 220˚C/W for the
MSOP-8 package.
Note 5: Typical numbers are at 25˚C and represent the most likely parametric norm. Specifications in standard type face are for T
J
= 25˚C and those with boldface
typeapply 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 Average 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: This parameter is production tested at 1A and guaranteed by design at 2A.
Note 9: The tolerance of the internal lead frame resistor is corrected internally. The temperature coefficient of this resistor is 2600 ppm/˚C.
LM3822
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