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LM27212 데이터시트(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM27212
상세설명  Two-Phase Current-Mode Hysteretic Buck Controller
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM27212 데이터시트(HTML) 8 Page - National Semiconductor (TI)

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Electrical Characteristics Specifications with standard typeface are for T
J = 25˚C, and those in bold face
type apply over a junction temperature range of -5˚C to +110˚C. Unless otherwise specified, VDD = 5V, SGND = DGND =
SRCK1 = 0V. (Note 5) (Continued)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Power Good Mask For
Dynamic Output Swing
100
133
179
µs
Power Good De-assertion
Delay Upon Shutdown
Delay From VRON de-assertion to PGOOD
de-assertion
90
ns
Over-voltage Protection
SENSE Voltage as a
Percentage of VOVP
VOVP = VREF
109
123
139
%
System
DE_EN# Input Logic
Low-to-High Transition
Threshold
0.63
V
DE_EN# Input Logic
High-to-Low Transition
Threshold
0.315
V
DE_EN# Pin Leakage Current DE_EN# = 7.5V
100
µA
Soft Shutdown Finish
Threshold
0.3
V
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is guaranteed. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics table. Functional temperature range is the
range within which the device performs its intended functions, but not necessarily meeting the limits specified in the Electrical Characteristic table.
Note 2: The maximum allowable power dissipation is calculated by using PDmax =(TJMAX -TA)/θJA , where TJMAX is the maximum junction temperature, TA is the
ambient temperature, and
θJA is the junction-to-ambient thermal resistance of the specified package. The 1.56W rating results from using 150˚C, 25˚C, and 80˚C/W
for TJMAX,TA, and θJA respectively. The θJA of 90˚C/W represents the worst-case condition with no heat sinking of the 48-Pin TSSOP. Heat sinking allows the safe
dissipation of more power. The Absolute Maximum power dissipation should be de-rated by 12.5mW per ˚C above 25˚C ambient. The LM27212 actively limits its
junction temperature to about 150˚C.
Note 3: For detailed information on soldering plastic small-outline packages, refer to the Packaging Databook available from National Semiconductor Corporation.
Note 4: For testing purposes, ESD was applied using the human-body model, a 100pF capacitor discharged through a 1.5k
Ω resistor.
Note 5: All limits are guaranteed at room temperature (standard face type) and at temperature extremes (bold face type). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via correlation using Statistical Quality Control (SQC) methods. All limits are used to calculate
Average Outgoing Quality Level (AOQL).
www.national.com
8


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