Datasheet
LM3424
SNVS603B –AUGUST 2009–REVISED OCTOBER 2009
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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 +125°C). 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.
Min Typ Max
Symbol Parameter Conditions Units
(2) (3) (2)
STARTUP REGULATOR (V
CC
)
V
CC-REG
V
CC
Regulation I
CC
= 0 mA 6.30 6.90 7.35 V
I
CC-LIM
V
CC
Current Limit V
CC
= 0V 20 25
mA
I
Q
Quiescent Current EN = 3.0V, Static 2.0 3.0
I
SD
Shutdown Current EN = 0V 0.1 1.0 µA
V
CC-UVLO
V
CC
UVLO Threshold V
CC
Increasing 4.17 4.50
V
CC
Decreasing 3.70 4.08 V
V
CC-HYS
V
CC
UVLO Hysteresis 0.1
ENABLE (EN)
V
EN-ST
EN Startup Threshold EN Increasing 1.75 2.40
EN decreasing 0.80 1.63 V
V
EN-HYS
EN Startup Hysteresis 0.1
R
EN
EN Pull-down Resistance 0.45 0.82 1.30 MΩ
OVER-VOLTAGE PROTECTION (OVP)
V
TH-OVP
OVP OVLO Threshold OVP Increasing 1.185 1.240 1.285 V
I
HYS-OVP
OVP Hysteresis Source OVP Active (high)
13 20 27 µA
Current
ERROR AMPLIFIER
V
CSH
CSH Reference Voltage With Respect to GND 1.210 1.235 1.260 V
Error Amplifier Input Bias
-0.6 0 0.6
Current
µA
COMP Sink / Source
17 26 35
Current
Transconductance 100 µA/V
Linear Input Range
(4)
±125 mV
Transconductance -6dB Unloaded Response
(4)
1.0 MHz
Bandwidth
OSCILLATOR (RT)
f
SW
Switching Frequency R
T
= 36 kΩ 164 207 250
kHz
R
T
= 12 kΩ 525 597 669
V
RT-SYNC
Sync Threshold 3.5 V
PWM COMPARATOR
V
CP-BASE
COMP to PWM Offset -
750 900 1050 mV
No Slope Compensation
SLOPE COMPENSATION (SLOPE)
ΔV
CP
Slope Compensation Additional COMP to PWM Offset - SLOPE
85 mV
Amplitude sinking 100 µA
(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 GND 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.
(4) These electrical parameters are specified by design, and are not verified by test.
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