7
FN9151.5
February 13, 2008
REFERENCE AND SOFT-START/ENABLE
Internal Reference Voltage V
REF
0.594 0.606 V
Soft-Start Current I
SS
-10-μA
Soft-Start Threshold V
SOFT
1.0 - - V
Enable Low (Converter disabled) --1.0V
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 7) -88-dB
Gain-Bandwidth Product (Note 7) GBW - 15 - MHz
Slew Rate (Note 7) SR - 6 - V/μs
PROTECTION
OCSET Current Source I
OCSET
Vocset = 4.5V 80 100 120 μA
POWER GOOD AND CONTROL FUNCTIONS
Power-Good Lower Threshold V
PG-
Fraction of the set point; ~3μs noise filter -14 -10 -8 %
Power-Good Higher Threshold V
PG+
Fraction of the set point; ~3μs noise filter 10 - 16 %
PGOOD Leakage Current I
PGLKG
V
PULLUP
= 5.5V - - 1 μA
PGOOD Voltage Low I
PGOOD
= 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
External Reference Input Range at
GPIO1/REFIN.
VMSET/MODE = H, C
REFOUT
= 2.2µF 0.6 - 1.25 V
REFERENCE BUFFER
Buffered Output Voltage - Internal Reference V
REFOUT
I
REFOUT
= 20mA,
VMSET/MODE = HIGH,
C
REFOUT
= 2.2µF, T
A
= -40°C to +85°C
0.585 0.6V 0.615 V
Buffered Output Voltage - External Reference V
REFOUT
V
REFIN
= 1.25V, I
REFOUT
= 20mA,
VMSET/MODE = HIGH,
C
REFOUT
= 2.2µF
Vrefin
-0.01
-Vrefin
+0.01
V
Current Drive Capability C
REFOUT
= 2.2µF 20 - - mA
VOLTAGE MARGINING
Voltage Margining Range (Note 7) -10 +10 %
CDEL Current for Voltage Margining - 100 - μA
Slew Time CDEL = 0.1µF, VMSET/MODE = 330kΩ -2.5-ms
Electrical Specifications Operating Conditions, Unless Otherwise Noted: VIN = 12V, PV
CC
shorted with V
CC5
, T
A
= +25°C (Continued)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
ISL6420
