ACT4050
Active- Semi
Rev 2, 01-Jul-11
ABSOLUTE MAXIMUM RATINGSc
PARAMETER
IN Supply Voltage
VALUE
UNIT
-0.3 to 15
V
SW Voltage
-1 to VIN + 1
SW - 0.3 to VSW + 8
-0.3 to 6
V
V
BS Voltage
V
EN, FB Voltage
V
Continuous SW Current
Internally Limited
A
Junction to Ambient Thermal Resistance (θJA)
Maximum Power Dissipation
Operating Junction Temperature
Storage Temperature
46
1.8
°C/W
W
-40 to 150
-55 to 150
300
°C
°C
°C
Lead Temperature (Soldering, 10 sec)
c: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may
affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = 25°C, unless otherwise specified.)
PARAMETER
Input Voltage
SYMBOL
VIN
TEST CONDITIONS
VOUT = 3V, ILOAD = 0V to 1A
5V ≤ VIN ≤ 15V
MIN
4.5
TYP
MAX
15
UNIT
V
Feedback Voltage
VFB
0.8
0.817
0.15
4.5
0.834
V
High-Side Switch On Resistance
Low-Side Switch On Resistance
SW Leakage
RONH
RONL
Ω
ꢀ
VEN = 0
0
10
µA
High-Side Switch Peak Current
Limit
ILIM
Duty Cycle = 50%
5.4
2.5
A
COMP to Current Limit
Transconductance
GCOMP
A/V
Error Amplifier Transconductance
Error Amplifier DC Gain
Switching Frequency
GEA
AVEA
fSW
ΔICOMP = ±10µA
650
4000
400
60
µA/V
V/V
kHz
kHz
%
350
450
Short Circuit Switching Frequency
Maximum Duty Cycle
V
FB = 0
DMAX
VFB = 0.7V
95
Minimum On Time
Ton_Min
400
ns
Minimum Duty Cycle
VFB = 0.9V
0
%
Enable Threshold Voltage
Hysteresis = 0.1V
0.8
1.1
2
1.4
V
Pin pulled up to 4.5V typically
when left unconnected
Enable Pull-Up Current
µA
Supply Current in Shutdown
IC Supply Current in Operation
Thermal Shutdown Temperature
V
EN = 0
12
0.5
160
20
1
µA
mA
°C
VEN = 3V, VFB = 0.9V
Hysteresis = 10°C
Innovative PowerTM
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