ACT4012A
Rev PrA, 21-Nov-07
ABSOLUTE MAXIMUM RATINGSc
PARAMETER
VALUE
UNIT
V
IN to G
-0.3 to 25
-0.3 to VIN +0.3
-1 to VIN + 1
EN to G
V
SW to G
V
BS to G
VSW - 0.3 to VSW + 8
V
FB, COMP to G
-0.3 to 6
V
Continuous SW Current
Junction to Ambient Thermal Resistance (θJA)
Maximum Power Dissipation
Operating Junction Temperature
Storage Temperature
Internally Limited
105
A
°C/W
W
0.76
-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
VOUT = 5V, ILOAD = 0A to 1.5A
4.75V ≤ VIN ≤ 20V
MIN
7.5
TYP
MAX UNIT
Input Voltage
20
V
V
Feedback Voltage
VFB
1.261
1.293
0.5
1.325
High-Side Switch On Resistance
Low-Side Switch On Resistance
SW Leakage
RONH
RONL
Ω
ꢀ
13.5
0
VEN = 0
10
µA
A
Current Limit
ILIM
1.8
2.7
COMP to Current Limit
Transconductance
GCOMP
1.5
A/V
Error Amplifier Transconductance
Error Amplifier DC Gain
Switching Frequency
GEA
AVEA
fSW
∆ICOMP = ±10µA
565
4000
420
50
µA/V
V/V
kHz
kHz
%
310
0.7
530
Short Circuit Switching Frequency
Maximum Duty Cycle
VFB = 0
DMAX
VFB = 1.1V
90
Minimum Duty Cycle
14
%
Enable Threshold Voltage
Hysteresis = 0.1V
1
1.3
20
V
Pin pulled up to IN when left
unconnected
Enable Pull-Up Current
2
µA
Supply Current in Shutdown
IC Supply Current in Operation
Thermal Shutdown Temperature
V
EN = 0
10
µA
mA
°C
VEN = 3V, VFB = 1.4V
0.85
160
Hysteresis = 10°C
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