ACT4070
Rev 2, 16-Sep-11
ABSOLUTE MAXIMUM RATINGS
PARAMETER
IN to GND
EN to GND
SW to GND
BS to SW
FB, COMP to GND
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 +34
-0.3 to V
IN
+ 0.3
-1 to V
IN
+ 1
-0.3 to +8
-0.3 to 6
Internally limited
46
1.8
-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
High-Side Switch Peak Current
Limit
COMP to Current Limit Transcon-
ductance
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
= 2.5V, I
LOAD
= 0A to 3A
MIN
4.5
TYP
MAX UNIT
30
V
V
mΩ
Ω
10
µA
A
A/V
µA/V
V/V
460
kHz
kHz
%
%
1.3
V
µA
20
2
µA
mA
°C
1.198 1.222 1.246
100
10
V
EN
= 0, V
IN
= 12V, V
SW
= 0V
0
5.3
3
550
4000
340
V
FB
= 0V
400
40
90
0
0.7
1
2
6
0.85
160
I
LIM
G
COMP
G
EA
A
VEA
f
SW
Duty Cycle = 50%
ΔI
LOAD
/ΔI
COMP
ΔI
COMP
= ±10µA
D
MAX
V
FB
= 1.1V, PWM mode
V
FB
= 1.4V, PFM mode
Hysteresis = 0.1V
Pin pulled up to V
IN
when left uncon-
nected
V
EN
= 0
V
EN
= 3V, not switching
Hysteresis = 10°C
-3-
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