Micrel, Inc.
MIC4680
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
)
(3)
..................................................+38V
Shutdown Voltage (V
SHDN
)............................. –0.3V to +38V
Steady-State Output Switch Voltage (V
SW
) ....................–1V
Feedback Voltage [Adjustable] (V
FB
) ...........................+12V
Storage Temperature (T
s
) .........................–65°C to +150°C
EDS Rating
(5)
Operating Ratings
(2)
Supply voltage (V
IN
)
(4)
....................................... +4V to +34V
Junction Temperature (T
J
) ....................................... +125°C
Package Thermal Resistance
(6)
SIOC (θ
JA
)..........................................................63°C/W
Electrical Characteristics
V
IN
= 12V; I
LOAD
= 500mA; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C,
Note 7;
unless noted.
Parameter
MIC4680 [Adjustable]
Feedback Voltage
(±1%)
(±1%)
8V
≤
V
IN
≤
34V, 0.1A
≤
I
LOAD
≤
1A, V
OUT
= 5V
Maximum Duty Cycle
Output Leakage Current
Quiescent Current
MIC4680-3.3
Output Voltage
(±1%)
(±3%)
6V
≤
V
IN
≤
34V, 0.1A
≤
I
LOAD
≤
1A
Maximum Duty Cycle
Output Leakage Current
Quiescent Current
MIC4680-5.0
Output Voltage
(±1%)
(±3%)
8V
≤
V
IN
≤
34V, 0.1A
≤
I
LOAD
≤
1A
Maximum Duty Cycle
Output Leakage Current
Quiescent Current
MIC4680/-3.3/-5.0
Frequency Fold Back
Oscillator Frequency
Saturation Voltage
Short Circuit
Current Limit
Standby Quiescent
Current
I
OUT
= 1A
V
FB
= 0V, see Test Circuit
V
SHDN
= V
IN
V
SHDN
= 5V (regulator off)
1.3
30
180
50
200
1.4
1.8
1.5
30
100
100
220
1.8
2.5
kHz
kHz
V
A
µA
µA
V
FB
= 4.0V
V
IN
= 34V, V
SHDN
= 5V, V
SW
= 0V
V
IN
= 34V, V
SHDN
= 5V, V
SW
= –1V
V
FB
= 6.0V
4.950
4.85
4.800
4.750
93
5.0
5.0
97
50
4
7
500
20
12
5.05
5.15
5.200
5.250
V
V
V
V
%
µA
mA
mA
V
FB
= 2.5V
V
IN
= 34V, V
SHDN
= 5V, V
SW
= 0V
V
IN
= 34V, V
SHDN
= 5V, V
SW
= –1V
V
FB
= 4.0V
3.266
3.201
3.168
3.135
93
3.3
3.3
97
50
4
7
500
20
12
3.333
3.399
3.432
3.465
V
V
V
V
%
µA
mA
mA
V
FB
= 1.0V
V
IN
= 34V, V
SHDN
= 5V, V
SW
= 0V
V
IN
= 34V, V
SHDN
= 5V, V
SW
= –1V
V
FB
= 1.5V
1.217
1.205
1.193
1.180
93
1.230
1.230
97
50
4
7
500
20
12
1.243
1.255
1.267
1.280
V
V
V
V
%
µA
mA
mA
Condition
Min
Typ
Max
Units
March 2008
3
M9999-032808
MICREL [ MICREL SEMICONDUCTOR ]
