ISL8540 데이터 시트보기 (PDF) - Intersil
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ISL8540 Datasheet PDF : 16 Pages
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ISL8540
Electrical Specifications
Unless otherwise specified the specifications listed in the table are tested at TA = +25°C and guard band for the
full Temperature Range, VIN = 24V, VOUT = 5.0V, IOUT = 0A. Typical values are at TA = +25°C. Parameters
with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits
established by characterization and are not production tested. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
Oscillation Frequency
Max Ramp Amplitude
Modulator Gain
Min OFF Time
fOSC
VIN = 9V to 40V, RT = 100kΩ, CT = 1200pF
VIN = 9V to 40V, RT = 27.4kΩ, CT = 220pF
ΔVOSC VIN = 9V
VVIN/ΔVOSC
60
kHz
725
kHz
1
VP
9
-
150 300
ns
REFERENCE AND SOFT-START
Internal Reference Voltage
Soft-Start Current
Soft-Start Threshold
ERROR AMPLIFIER
VREF
ISS
VSOFT
1.21
V
8
10
12
µA
1.0
V
Transconductance
Gain-Bandwidth Product
gm
GBW
3.9
5.7
7.2
ms
15
MHz
Slew Rate
SR
6
V/µs
COMP Pin Drive
Internal Feedback Voltage
Internal Feedback Bias Current
OVERCURRENT PROTECTION
ICOMP
VFB
IFB
TA = -40°C to +85°C, VIN = 9.0V to 40V
TA = -40°C to +85°C, VFB = 1.20V
±200
µA
1.194 1.210 1.222
V
±50 ±100
nA
Dynamic Current Limit ON Time
tOCON
16
Clock
pulses
Dynamic Current Limit OFF Time
Switch Current Limit
POWER-GOOD (OPEN DRAIN)
tOCOFF
ILIMIT
TA = +25°C
4
SS cycle
3.2
4.0
4.8
A
Power-Good Lower Threshold
PGOOD Leakage Current
PGOOD Voltage Low
MOSFET
VPG-
Fraction of the VOUT set point; ~3µs noise filter 85
VPG+ Fraction of the VOUT set point; ~3µs noise filter 111
IPGLKG VPULLUP = 5.5V
IPGOOD = 4mA
89
%
115
%
1
µA
0.5
V
Switch ON-Resistance
rDS(ON)
IOUT = 2A, VBOOT = VIN + 5.0V, Tested at wafer
level
0.19 0.355
Ω
EN
Input HIGH Level (Asserted)
VINHIGH
2.6
V
Input LOW Level (Unasserted)
VINLOW
1.2
V
Input Current HIGH
Input Current LOW
SYNC
IENHIGH
IENLOW
VIN = 24V
VIN = 24V
25
µA
25
µA
Input HIGH Level (Asserted)
VINHIGH
2.6
V
Input LOW Level (Unasserted)
VINLOW
1.2
V
Input Current HIGH
Input Current LOW
ISYNCHIGH
ISYNCLOW
0.2
µA
0.2
µA
3
FN6495.5
September 9, 2008
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