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ISL78840ASRH, ISL78841ASRH, ISL78843ASRH, ISL78845ASRH
6
FN6991.1
August 19, 2010
Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to Block Diagram and
Typical Application schematic on page 3 and page 4. VDD = 13.2V, RT = 10kΩ, CT = 3.3nF, TA = -55 to +125°C. Typical values are at TA = +25°C.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
UNDERVOLTAGE LOCKOUT
START Threshold
ISL78840A, ISL78841A
-
7.0
-
V
ISL78843A, ISL78845A
-
8.4
-
V
STOP Threshold
ISL78840A, ISL78841A
-
6.6
-
V
ISL78843A, ISL78845A
-
7.6
-
V
Hysteresis
ISL78840A, ISL78841A
-
0.4
-
V
ISL78843A, ISL78845A
-
0.8
-
V
Start-up Current, IDD
VDD < START Threshold
-
90
-
A
VDD < START Threshold, 100krad
-
300
-
A
Operating Current, IDD
-
2.9
-
mA
Operating Supply Current, ID
Includes 1nF GATE loading
-
4.75
-
mA
REFERENCE VOLTAGE
Overall Accuracy
Over line (VDD = 9V to 13.2V),
load 1mA and 10mA, temperature
-5.000
-
V
Long Term Stability
TA = +125°C, 1000 hours (Note 4) -
5
-
mV
Current Limit, Sourcing
-
mA
Current Limit, Sinking
-
mA
CURRENT SENSE
Input Bias Current
VCS = 1V
-
A
Input Signal, Maximum
-
1.00
-
V
Gain, ACS = ΔVCOMP/ΔVCS
0 < VCS < 910mV, VFB = 0V
-
3.0
-
V/V
CS to OUT Delay
-35
-
ns
ERROR AMPLIFIER
Open Loop Voltage Gain
-
90
-
dB
Unity Gain Bandwidth
-
1.5
-
MHz
Reference Voltage
VFB = VCOMP
-2.500
-
V
FB Input Bias Current
VFB = 0V
-
-0.2
-
A
COMP Sink Current
VCOMP = 1.5V, VFB = 2.7V
-
mA
COMP Source Current
VCOMP = 1.5V, VFB = 2.3V
-
mA
COMP VOH
VFB = 2.3V
-
V
COMP VOL
VFB = 2.7V
-
V
PSRR
Frequency = 120Hz, VDD = 9V to
-80
-
dB
OSCILLATOR
Frequency Accuracy
Initial, TA = +25°C
-
51
-
kHz
Frequency Variation with VDD
TA= +25°C, (f13.2V - f9V)/f12V
-0.2
-
%
Temperature Stability
-
5
-%
Amplitude, Peak-to-Peak
Static Test
-
1.75
-
V
RTCT Discharge Voltage (Valley Voltage)
Static Test
-
1.0
-
V
Discharge Current
RTCT = 2.0V
-
7.8
-
mA
OUTPUT
ISL78840ASRH, ISL78841ASRH, ISL78843ASRH, ISL78845ASRH