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ISL6420A Datasheet, PDF (8/21 Pages) Intersil Corporation – Advanced Single Synchronous Buck Pulse-Width Modulation PWM Controller
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ISL6420A
Electrical Specifications Operating Conditions: VIN = 12V, PVCC shorted with VCC5, TA = +25°C. Boldface limits
apply over the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 12) TYP (Note 12) UNITS
REFERENCE AND SOFT-START/ENABLE
Internal Reference Voltage
Soft-Start Current
Soft-Start Threshold
Enable Low
(Converter Disabled)
VREF
ISS
VSOFT
0.594
-
0.606
V
-
10
-
µA
1.0
-
-
V
-
-
1.0
V
PWM CONTROLLER GATE DRIVERS
Gate Drive Peak Current
-
0.7
-
A
Rise Time
Co = 1000pF
-
20
-
ns
Fall Time
Co = 1000pF
-
20
-
ns
Dead Time Between Drivers
-
20
-
ns
ERROR AMPLIFIER
DC Gain (Note 10)
-
88
-
dB
Gain-Bandwidth Product
(Note 10)
GBW
-
15
-
MHz
Slew Rate (Note 10)
SR
-
6
-
V/µs
COMP Souce/Sink Current
(Note 10)
±0.4
mA
OVERCURRENT PROTECTION
OCSET Current Source
IOCSET VOCSET = 4.5V
POWER-GOOD AND CONTROL FUNCTIONS
80
100
120
µA
Power-Good Lower Threshold
VPG- Fraction of the set point; ~3µs noise filter
-14
-10
-8
%
Power-Good Higher Threshold
VPG+ Fraction of the set point; ~3µs noise filter
9
-
16
%
PGOOD Leakage Current
IPGLKG VPULLUP = 5.0V (Note 11)
-
-
1
µA
PGOOD Voltage Low
IPGOOD = 4mA
-
-
0.5
V
PGOOD Delay
CDEL = 0.1µF
-
125
-
ms
CDEL Current for PGOOD
CDEL threshold = 2.5V
-
2
-
µA
CDEL Threshold
-
2.5
-
V
EXTERNAL REFERENCE
Min External Reference Input at
GPIO1/REFIN
VMSET/MODE = H, CREFOUT = 2.2µF
-
0.600
-
V
Max External Reference Input
at GPIO1/REFIN
VMSET/MODE = H, CREFOUT = 2.2µF
-
-
1.250
V
REFERENCE BUFFER
Buffered Output Voltage -
Internal Reference
Buffered Output Voltage -
Internal Reference
Buffered Output Voltage -
External Reference
Buffered Output Voltage -
External Reference
VREFOUT IREFOUT = 1mA,VMSET/MODE = High,
0.583 0.595 0.607
V
CREFOUT = 2.2µF, TA = -40°C to +85°C
VREFOUT IREFOUT = 20mA,VMSET/MODE = High,
0.575 0.587 0.599
V
CREFOUT = 2.2µF, TA = -40°C to +85°C
VREFOUT VREFIN = 1.25V, IREFOUT = 1mA,
1.227 1.246 1.265
V
VMSET2/MODE = High, CREFOUT = 2.2µF
VREFOUT VREFIN = 1.25V, IREFOUT = 20mA,
1.219 1.238 1.257
V
VMSET2/MODE = High,CREFOUT = 2.2µF
8
FN9169.4
December 4, 2009
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