Datasheet
LM3421, LM3421-Q1
LM3423, LM3423-Q1
www.ti.com
SNVS574E –JULY 2008–REVISED MAY 2013
Electrical Characteristics
(1)
Specifications in standard type face are for T
J
= 25°C and those with boldface type apply over the full Operating
Temperature Range ( T
J
= −40°C to +150°C for LM3421Q0/LM3423Q0, T
J
= −40°C to +125°C for all others). Specifications
that differ between the two operating ranges will be identified in the Temp Range column as Q0 for T
J
= −40°C to +150°C
and as Q1 for T
J
= −40°C to +125°C. If no temperature range is indicated then the specification holds for both Q1 and Q0.
Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most
likely parametric norm at T
J
= +25°C, and are provided for reference purposes only. Unless otherwise stated the following
condition applies: V
IN
= +14V.
Temp
Symbol Parameter Conditions Min
(2)
Typ
(3)
Max
(2)
Units
Range
STARTUP REGULATOR
V
CCREG
V
CC
Regulation I
CC
= 0 mA 6.30 6.90 7.35 V
I
CCLIM
V
CC
Current Limit V
CC
= 0V 20 25
I
Q
Quiescent Current EN = 3.0V, Static Q1 3 mA
2
Q0 3.5
I
SD
Shutdown Current EN = 0V 0.1 1.0 µA
V
CC
SUPPLY
V
CCUV
V
CC
UVLO Threshold V
CC
Increasing 4.17 4.50
V
CC
Decreasing 3.70 4.08 V
V
CCHYS
V
CC
UVLO Hysteresis 0.1
EN THRESHOLDS
EN
ST
EN Startup Threshold EN Increasing Q1 2.40
1.75
Q0 2.75
V
EN Decreasing 0.80 1.63
EN
STHYS
EN Startup Hysteresis 0.1
R
EN
EN Pulldown Resistance EN = 1V Q1 1.30
0.45 0.82 MΩ
Q0 1.80
CSH THRESHOLDS
CSH High Fault CSH Increasing 1.6
V
CSH Low Condition on LRDY CSH increasing
1.0
Pin (LM3423)
OV THRESHOLDS
OVP
CB
OVP OVLO Threshold OVP Increasing 1.185 1.240 1.285 V
OVP
HYS
OVP Hysteresis Source OVP Active (high) Q1 25
20 23 µA
Current
Q0 26
DPOL THRESHOLDS
DPOL
THRES
DPOL Logic Threshold DPOL Increasing
2.0 2.3 2.6 V
H
R
DPOL
DPOL Pullup Resistance 500 1200 kΩ
FAULT TIMER
V
FLTTH
Fault Threshold Q1 1.285
1.185 1.240 V
Q0 1.290
I
FLT
Fault Pin Source Current Q1 13.0
10.0 11.5 µA
Q0 13.5
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the Operating Ratings is not implied. The recommended Operating Ratings indicate
conditions at which the device is functional and the device should not be operated beyond such conditions. All voltages are with respect
to the potential at the AGND pin, unless otherwise specified.
(2) All limits specified at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are
100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC)
methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3) Typical numbers are at 25°C and represent the most likely norm.
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