Active-Semi
ABSOLUTE MAXIMUM RATINGS
PARAMETER
IN Supply Voltage
SW Voltage
BST 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)
ACT4082A
VALUE
-0.3 to 20
-1 to V
IN
+ 1
V
SW
- 0.3 to V
SW
+ 7
-0.3 to 6
Internally Limited
220
0.5
-40 to 150
-55 to 150
300
Rev0, 16-May-08
UNIT
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
Under Voltage Lockout Voltage
Under Voltage Lockout Hysteresis
Feedback Voltage
Frequency Foldback Threshold
High-side Switch On Resistance
Low-side Switch On Resistance
SW Leakage
Current Limit
Switching Frequency
Foldback Switching Frequency
Maximum Duty Cycle
Minimum On-Time
EN Threshold Voltage
EN Hysteresis
EN Internal Pull-up Current
Supply Current in Shutdown
Supply Current in Operation
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
SYMBOL
V
IN
V
UVLO
V
FB
R
ONH
R
ONH
TEST CONDITIONS
V
OUT
= 3.3V, I
LOAD
= 0A to 1.2A
Input Voltage Rising
4.75V
≤
V
IN
≤
16V, V
COMP
= 1.5V
MIN
4.5
4
0.78
TYP
4.2
250
0.81
250
0.300
15
MAX
16
4.49
0.84
UNIT
V
V
mV
V
mV
Ω
Ω
V
EN
= 0, V
SW
= 0V
I
LTM
f
SW
V
FB
= 0V, or FB = G
D
MAX
V
FB
= 0.6V
EN Rising
EN Rising
V
EN
= 0V or EN = G
V
EN
= 2V, V
FB
= 1.0V
1.12
V
IN
= 12V, V
OUT
= 5V, or
EN = G, SW = G
1.1
1
1.8
1.4
467
92
75
1.24
100
2
15
1
160
10
10
µA
A
1.7
MHz
kHz
%
ns
1.36
V
mV
µA
30
2
µA
mA
°C
°C
Innovative Power
TM
-3-
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Copyright © 2008 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
