ACT4012A
Rev0, 16-May-08
ABSOLUTE MAXIMUM RATINGS
PARAMETER
IN to G
EN to G
SW to G
BS to G
FB, COMP to G
Continuous SW Current
Junction to Ambient Thermal Resistance (θ
JA
)
Maximum Power Dissipation
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
VALUE
-0.3 to 25
-0.3 to V
IN
+0.3
-1 to V
IN
+ 1
V
SW
- 0.3 to V
SW
+ 8
-0.3 to 6
Internally Limited
105
0.76
-40 to 150
-55 to 150
300
UNIT
V
V
V
V
V
A
°C/W
W
°C
°C
°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
(V
IN
= 12V, T
A
= 25°C, unless otherwise specified.)
PARAMETER
Input Voltage
Feedback Voltage
High-Side Switch On Resistance
Low-Side Switch On Resistance
SW Leakage
Current Limit
COMP to Current Limit
Transconductance
Error Amplifier Transconductance
Error Amplifier DC Gain
Switching Frequency
Short Circuit Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Enable Threshold Voltage
Enable Pull-Up Current
Supply Current in Shutdown
IC Supply Current in Operation
Thermal Shutdown Temperature
Innovative Power
TM
SYMBOL
V
IN
V
FB
R
ONH
R
ONL
TEST CONDITIONS
V
OUT
= 5V, I
LOAD
= 0A to 1.5A
4.75V
≤
V
IN
≤
20V
MIN
7.5
1.261
TYP
1.293
0.5
13.5
MAX
20
1.325
UNIT
V
V
Ω
Ω
V
EN
= 0
I
LIM
G
COMP
G
EA
A
VEA
f
SW
V
FB
= 0
D
MAX
V
FB
= 1.1V
310
∆I
COMP
= ±10µA
1.8
0
2.7
1.5
565
4000
420
50
90
14
10
µA
A
A/V
µA/V
V/V
530
kHz
kHz
%
%
Hysteresis = 0.1V
Pin pulled up to IN when left
unconnected
V
EN
= 0
V
EN
= 3V, V
FB
= 1.4V
Hysteresis = 10°C
-3-
0.7
1
2
10
0.85
160
1.3
V
µA
20
µA
mA
°C
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