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ACT4012
ABSOLUTE MAXIMUM RATINGS
(Note: Exceeding these limits may damage the device. Exposure to absolute maximum rating conditions for long periods may affect device
reliability.)
PARAMETER
VALUE
UNIT
IN Supply Voltage
-0.3 to 25
V
SW Voltage
-1 to VIN + 1
V
BS Voltage
VSW – 0.3 to VSW + 8
V
EN, FB, COMP Voltage
-0.3 to 6
V
Continuous SW Current
Internally limited
A
Junction to Ambient Thermal Resistance (
θ JA)
105
°C/W
Maximum Power Dissipation
0.76
W
Operating Junction Temperature
-40 to 150
°C
Storage Temperature
-55 to 150
°C
Lead Temperature (Soldering, 10 sec)
300
°C
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA= 25°C unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input Voltage
VIN
VOUT = 5V, ILOAD = 0A to 1A
7
20
V
Feedback Voltage
VFB
4.75V ≤ VIN ≤ 20V, VCOMP = 1.5V
1.267
1.293
1.319
V
High-Side Switch On Resistance
RONH
0.4
Ω
Low-Side Switch On Resistance
RONL
10
Ω
SW Leakage
VEN = 0
0
10
µA
Current Limit
ILIM
2.4
2.85
A
COMP to Current Limit
Transconductance
GCOMP
1.8
A/V
Error Amplifier Transconductance
GEA
ΔICOMP = ±10µA
550
µA/V
Error Amplifier DC Gain
AVEA
4000
V/V
Switching Frequency
fSW
350
410
470
kHz
Short Circuit Switching Frequency
VFB = 0
50
kHz
Maximum Duty Cycle
DMAX
VFB = 1.1V
90
%
Minimum Duty Cycle
VFB = 1.4V
0
%
Enable Threshold Voltage
Hysteresis = 0.1V
0.7
1
1.3
V
Enable Pull Up Current
Pin pulled up to 4.5V typically when
left unconnected
2
µA
Supply Current in Shutdown
VEN = 0
8
20
µA
IC Supply Current in Operation
VEN = 3V, VFB = 1.4V
0.7
mA
Thermal Shutdown Temperature
Hysteresis = 10°C
160
°C
Active-Semi, Inc.
- 3 -
www.active-semi.com
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