ACT4070
Rev 2, 16-Sep-11
ABSOLUTE MAXIMUM RATINGSc
PARAMETER
VALUE
UNIT
V
IN to GND
-0.3 to +34
-0.3 to VIN + 0.3
-1 to VIN + 1
-0.3 to +8
-0.3 to 6
EN to GND
V
SW to GND
V
BS to SW
V
FB, COMP to GND
V
Continuous SW Current
Junction to Ambient Thermal Resistance (θJA)
Maximum Power Dissipation
Operating Junction Temperature
Storage Temperature
Internally limited
46
A
°C/W
W
1.8
-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
SYMBOL
VIN
TEST CONDITIONS
MIN TYP MAX UNIT
Input Voltage
VOUT = 2.5V, ILOAD = 0A to 3A
4.5
30
V
V
Feedback Voltage
VFB
1.198 1.222 1.246
High-Side Switch On Resistance
Low-Side Switch On Resistance
SW Leakage
RONH
RONL
100
10
mΩ
ꢀ
VEN = 0, VIN = 12V, VSW = 0V
0
10
µA
High-Side Switch Peak Current
Limit
ILIM
Duty Cycle = 50%
5.3
A
COMP to Current Limit Transcon-
ductance
GCOMP
ΔILOAD/ΔICOMP
3
A/V
Error Amplifier Transconductance
Error Amplifier DC Gain
Switching Frequency
GEA
AVEA
fSW
ΔICOMP = ±10µA
550
4000
400
40
µA/V
V/V
kHz
kHz
%
340
0.7
460
1.3
Short Circuit Switching Frequency
Maximum Duty Cycle
V
FB = 0V
VFB = 1.1V, PWM mode
FB = 1.4V, PFM mode
DMAX
90
Minimum Duty Cycle
V
0
%
Enable Threshold Voltage
Hysteresis = 0.1V
1
V
Pin pulled up to VIN when left uncon-
nected
Enable Pull Up Current
2
µA
Supply Current in Shutdown
IC Supply Current in Operation
Thermal Shutdown Temperature
V
EN = 0
6
20
2
µA
mA
°C
VEN = 3V, not switching
0.85
160
Hysteresis = 10°C
Innovative PowerTM
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