ACT4455
Rev 2, 21-Nov-12
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = 25°C, unless otherwise specified.)
PARAMETER
SYMBOL TEST CONDITIONS
Feedback Voltage
Error Amplifier Voltage Gain
Error Amplifier Transconductance
Over Voltage Protection Threshold
Max E/A Source Current
Max E/A Sink Current
High-Side Switch ON-Resistance
Low-Side Switch ON-Resistance
Maximum Duty Cycle
Switching Frequency
Upper Switch Current Limit
COMP to Current Limit
Transconductance
VFB
AEA
GEA
VOVP
ISRCMAX
ISINKMAX
RDS(ON)1
RDS(ON)2
DMAX
FSW
ILIM
GCOMP
7.5V ≤ VIN ≤ 40V
∆ICOMP = ± 10µA
VFB = 0.5V
VFB = 1.0V
At 25°C
Duty Cycle = 65%
Minimum on Time
Input Under Voltage Lockout Thresh-
old
TON_MIN
VIN_Rise
VIN Rising
Input Under Voltage Lockout Hystere-
sis
VIN_Falling
VIN Falling
Internal Soft Startup Time
CS1 reference voltage
CS2 reference voltage
Frequency Foldback Threshold
Cord Compensation
TSS
VCS1
VCS2
VFB_Foldback
VIN = 12V, RFB1=200k, IOUT =
5A
Thermal Shutdown
MIN
798
180
6.75
113
113
TYP
808
4000
650
41
120
120
38
5
80
200
6.5
MAX
818
220
UNIT
mV
V/V
µA/V
V
µA
µA
mΩ
Ω
%
kHz
A
5
A/V
250
ns
7
7.25
V
650
mV
3.0
ms
116 119 mV
116 119 mV
0.65
V
0.35
V
150
°C
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