4
LTC1923
1923f
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1923E is guaranteed to meet specifications from 0°C to
70°C. Specifications over the –40°C to 85°C operating temperature range
are assured by design, characterization and correlation with statistical
process controls.
ELECTRICAL CHARACTERISTICS
Note 3: Guaranteed by design, not tested in production.
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
DD
= 5V, R
SLEW
= V
DD
, SDSYNC = V
DD
, R
T
= 10k, C
T
= 330pF unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
TEC Voltage Amplifier
ATEC Amplifier Gain 0.98 1 1.02 V/V
TECOFF Amplifier Offset Measured at V
TEC
, V
CM
= 2.5V –7 mV
TECCMR Common Mode Rejection 0.1V < V
CM
< 4.9V 60 dB
V
TECH
Output High Voltage I
LOAD
= –50µA 4.7 4.9 V
V
TECL
Output Low Voltage I
LOAD
= 50µA 0.1 0.3 V
f3dB –3dB Frequency (Note 3) 1 MHz
Output Drivers
OUTH Output High Voltage I
OUT
= –100mA 4 4.5 V
OUTL Output Low Voltage I
OUT
= 100mA 0.7 1.2 V
t
RISE
Output Rise Time C
LOAD
= 1nF 20 ns
t
FALL
Output Fall Time C
LOAD
= 1nF 20 ns
t
rSLEW
Output Rise Time C
LOAD
= 1nF, R
SLEW
= 10k 20 ns
t
fSLEW
Output Fall Time C
LOAD
= 1nF, R
SLEW
= 10k 20 ns
t
rSLEW
Output Rise Time C
LOAD
= 1nF, R
SLEW
= 100k 90 ns
t
fSLEW
Output Slew Fall Time C
LOAD
= 1nF, R
SLEW
= 100k 90 ns
SLEWVT R
SLEW
Disable Threshold 2.75 V
DLY Output Dead Time R
T
= 10k 90 ns
Fault
OPENTH Open Thermistor Threshold V
SET
= 5V, Measured with Respect to V
SET
–410 mV
SHRTTH Shorted Thermistor Threshold V
SET
= 5V, Measured with Respect to GND 0.975 V
FLTV Fault Output Low Voltage 1mA Into FAULT, During Fault 150 300 mV
Direction Comparator
DIRH Low-to-High Threshold TEC
–
= 2.5V, Measured with Respect to TEC
–
50 mV
Sensed When H/C Toggles Low
DIRL High-to-Low Threshold TEC
–
= 2.5V, Measured with Respect to TEC
–
–50 mV
Sensed When H/C Toggles High
HCV H/C Output Low Voltage 1mA Into Pin 150 300 mV
