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ISL8845AABZ

P1-P3P4-P6P7-P9P10-P12P13-P15
7
FN6320.3
April 18, 2007
Input Signal, Maximum 0.97 1.00 1.03 V
Gain, A
CS
= ΔV
COMP
/ΔV
CS
0 < V
CS
< 910mV, V
FB
= 0V 2.5 3.0 3.5 V/V
CS to OUT Delay -3555ns
ERROR AMPLIFIER
Open Loop Voltage Gain (Note 5) 60 90 - dB
Unity Gain Bandwidth (Note 5) 1.0 1.5 - MHz
Reference Voltage V
FB
= V
COMP
2.475 2.500 2.530 V
FB Input Bias Current V
FB
= 0V -1.0 -0.2 1.0 μA
COMP Sink Current V
COMP
= 1.5V, V
FB
= 2.7V 1.0 - - mA
COMP Source Current V
COMP
= 1.5V, V
FB
= 2.3V -0.4 - - mA
COMP VOH V
FB
= 2.3V 4.80 - VREF V
COMP VOL V
FB
= 2.7V 0.4 - 1.0 V
PSRR Frequency = 120Hz, V
DD
= 12V to
30V (Note 5)
60 80 - dB
OSCILLATOR
Frequency Accuracy Initial, T
A
= +25°C 48 51 53 kHz
Frequency Variation with V
DD
T
A
= +25°C, (f
30V
- f
10V
)/f
30V
-0.21.0%
Temperature Stability (Note 5) - - 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 6.5 7.8 8.5 mA
OUTPUT
Gate VOH V
DD
to OUT, I
OUT
= -200mA - 1.0 2.0 V
Gate VOL OUT to GND, I
OUT
= 200mA - 1.0 2.0 V
Peak Output Current C
OUT
= 1nF (Note 5) - 1.0 - A
Rise Time C
OUT
= 1nF (Note 5) - 20 40 ns
Fall Time C
OUT
= 1nF (Note 5) - 20 40 ns
GATE VOL UVLO Clamp Voltage VDD = 5V, I
LOAD
= 1mA - - 1.2 V
PWM
Maximum Duty Cycle
(ISL8840A, ISL8842A, ISL8843A)
COMP = VREF 94.0 96.0 - %
Maximum Duty Cycle
(ISL8841A, ISL8844A, ISL8845A)
COMP = VREF 47.0 48.0 - %
Minimum Duty Cycle COMP = GND - - 0 %
NOTES:
3. Specifications at -40°C and +105°C are guaranteed by +25°C test with margin limits.
4. This is the V
DD
current consumed when the device is active but not switching. Does not include gate drive current.
5. These parameters, although guaranteed, are not 100% tested in production.
6. Adjust V
DD
above the start threshold and then lower to 15V.
Electrical Specifications ISL884xAA - Recommended operating conditions unless otherwise noted. Refer to Block Diagram and
Typical Application schematic onpage 3 and page 4. V
DD
= 15V, R
T
= 10kΩ, C
T
= 3.3nF, T
A
= -40 to +105°C
(Note 3). Typical values are at T
A
= +25°C (Continued)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
8
FN6320.3
April 18, 2007
Electrical Specifications ISL884xAM - Recommended operating conditions unless otherwise noted. Refer to Block Diagram and
Typical Application schematic. V
DD
= 15V, RT = 10kΩ, CT = 3.3nF, T
A
= -55 to +125°C (Note 7), Typical values
are at T
A
= +25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
UNDERVOLTAGE LOCKOUT
START Threshold (ISL8840A, ISL8841A) 6.5 7.0 7.5 V
START Threshold (ISL8843A, ISL8845A) 8.0 8.4 9.0 V
START Threshold (ISL8842A, ISL8844A) (Note 10) 13.3 14.3 15.3 V
STOP Threshold (ISL8840A, ISL8841A) 6.1 6.6 6.9 V
STOP Threshold (ISL8843A, ISL8845A) 7.3 7.6 8.0 V
STOP Threshold (ISL8842A, ISL8844A) 8.0 8.8 9.6 V
Hysteresis (ISL8840A, ISL8841A) - 0.4 - V
Hysteresis (ISL8843A, ISL8845A) - 0.8 - V
Hysteresis (ISL8842A, ISL8844A) - 5.4 - V
Startup Current, I
DD
V
DD
< START Threshold - 90 125 μA
Operating Current, I
DD
(Note 8) - 2.9 4.0 mA
Operating Supply Current, I
D
Includes 1nF GATE loading - 4.75 5.5 mA
REFERENCE VOLTAGE
Overall Accuracy Over line (V
DD
= 12V to 30V), load,
temperature
4.900 5.000 5.050 V
Long Term Stability T
A
= +125°C, 1000 hours (Note 9) - 5 - mV
Current Limit, Sourcing -20 - - mA
Current Limit, Sinking 5--mA
CURRENT SENSE
Input Bias Current V
CS
= 1V -1.0 - 1.0 μA
CS Offset Voltage V
CS
= 0V (Note 9) 95 100 105 mV
COMP to PWM Comparator Offset Voltage V
CS
= 0V (Note 9) 0.80 1.15 1.30 V
Input Signal, Maximum 0.97 1.00 1.03 V
Gain, A
CS
= ΔV
COMP
/ΔV
CS
0 < V
CS
< 910mV, V
FB
= 0V 2.5 3.0 3.5 V/V
CS to OUT Delay -3560ns
ERROR AMPLIFIER
Open Loop Voltage Gain (Note 9) 60 90 - dB
Unity Gain Bandwidth (Note 9) 1.0 1.5 - MHz
Reference Voltage V
FB
= V
COMP
2.460 2.500 2.535 V
FB Input Bias Current V
FB
= 0V -1.0 -0.2 1.0 μA
COMP Sink Current V
COMP
= 1.5V, V
FB
= 2.7V 1.0 - - mA
COMP Source Current V
COMP
= 1.5V, V
FB
= 2.3V -0.4 - - mA
COMP VOH V
FB
= 2.3V 4.80 - VREF V
COMP VOL V
FB
= 2.7V 0.4 - 1.0 V
PSRR Frequency = 120Hz, V
DD
= 12V to
30V (Note 9)
60 80 - dB
OSCILLATOR
Frequency Accuracy Initial, T
A
= +25°C 485153kHz
Frequency Variation with V
DD
T
A
= +25°C, (f
30V
- f
10V
)/f
30V
-0.21.0%
Temperature Stability (Note 9) - - 5 %
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
9
FN6320.3
April 18, 2007
Amplitude, Peak to Peak Static Test - 1.75 - V
RTCT Discharge Voltage (Valley Voltage) Static Test - 1.0 - V
Discharge Current RTCT = 2.0V 6.2 8.0 8.5 mA
OUTPUT
Gate VOH V
DD
- OUT, I
OUT
= -200mA - 1.0 2.0 V
Gate VOL OUT - GND, I
OUT
= 200mA - 1.0 2.0 V
Peak Output Current C
OUT
= 1nF (Note 9) - 1.0 - A
Rise Time C
OUT
= 1nF (Note 9) - 20 40 ns
Fall Time C
OUT
= 1nF (Note 9) - 20 40 ns
GATE VOL UVLO Clamp Voltage V
DD
= 5V, I
LOAD
= 1mA - - 1.2 V
PWM
Maximum Duty Cycle
(ISL8840A, ISL8842A, ISL8843A)
COMP = VREF 94.0 96.0 - %
Maximum Duty Cycle
(ISL8841A, ISL8844A, ISL8845A)
COMP = VREF 47.0 48.0 - %
Minimum Duty Cycle COMP = GND - - 0 %
NOTES:
7. Specifications at -55°C and +125°C are guaranteed by +25°C test with margin limits.
8. This is the V
DD
current consumed when the device is active but not switching. Does not include gate drive current.
9. These parameters, although guaranteed, are not 100% tested in production.
10. Adjust V
DD
above the start threshold and then lower to 15V.
Electrical Specifications ISL884xAM - Recommended operating conditions unless otherwise noted. Refer to Block Diagram and
Typical Application schematic. V
DD
= 15V, RT = 10kΩ, CT = 3.3nF, T
A
= -55 to +125°C (Note 7), Typical values
are at T
A
= +25°C (Continued)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Typical Performance Curves
FIGURE 1. FREQUENCY vs TEMPERATURE FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
-60 -40 -20 0 20 40 60 80 100 120 140
0.98
0.99
1.00
1.01
TEMPERATURE (°C)
NORMALIZED FREQUENCY
-60 -40 -20 0 20 40 60 80 100
0.995
0.996
0.997
0.998
0.999
1.000
1.001
TEMPERATURE (°C)
NORMALIZED VREF
140120
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
P1-P3P4-P6P7-P9P10-P12P13-P15

ISL8845AABZ

Mfr. #:
Buy ISL8845AABZ
Manufacturer:
Renesas / Intersil
Description:
Switching Controllers CUR MODE PWM 50% DC 8 4V UVLO 8LD
Lifecycle:
New from this manufacturer.
Delivery:
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