Active-Semi
ABSOLUTE MAXIMUM RATINGS
PARAMETER
IN Supply Voltage
SW Voltage
BS Voltage
EN, FB Voltage
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 15
ACT4050
Rev 2, 01-Jul-11
UNIT
V
V
V
V
A
°C/W
W
°C
°C
°C
-1 to V
IN
+ 1
V
SW
- 0.3 to V
SW
+ 8
-0.3 to 6
Internally Limited
46
1.8
-40 to 150
-55 to 150
300
: 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
Transconductance
Error Amplifier Transconductance
Error Amplifier DC Gain
Switching Frequency
Short Circuit Switching Frequency
Maximum Duty Cycle
Minimum On Time
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
= 3V, I
LOAD
= 0V to 1A
5V
≤
V
IN
≤
15V
MIN
4.5
0.8
TYP
MAX
15
UNIT
V
V
Ω
Ω
0.817
0.15
4.5
0.834
V
EN
= 0
I
LIM
G
COMP
G
EA
A
VEA
f
SW
V
FB
= 0
D
MAX
Ton_Min
V
FB
= 0.9V
Hysteresis = 0.1V
Pin pulled up to 4.5V typically
when left unconnected
V
EN
= 0
V
EN
= 3V, V
FB
= 0.9V
Hysteresis = 10°C
-3-
0
5.4
2.5
10
µA
A
A/V
µA/V
V/V
Duty Cycle = 50%
ΔI
COMP
= ±10µA
650
4000
350
400
60
95
400
0
0.8
1.1
2
12
0.5
160
20
1
1.4
450
kHz
kHz
%
ns
%
V
µA
µA
mA
°C
V
FB
= 0.7V
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