Datasheet
Micrel, Inc. MIC4680
March 2008 3
M9999-032808
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 Condition Min Typ Max Units
MIC4680 [Adjustable]
(±1%)
(±1%)
1.217
1.205
1.230
1.243
1.255
V
V
Feedback Voltage
8V ≤ V
IN
≤ 34V, 0.1A ≤ I
LOAD
≤ 1A, V
OUT
= 5V
1.193
1.180
1.230
1.267
1.280
V
V
Maximum Duty Cycle V
FB
= 1.0V 93 97 %
Output Leakage Current V
IN
= 34V, V
SHDN
= 5V, V
SW
= 0V 50 500 µA
V
IN
= 34V, V
SHDN
= 5V, V
SW
= –1V 4 20 mA
Quiescent Current V
FB
= 1.5V 7 12 mA
MIC4680-3.3
Output Voltage
(±1%)
(±3%)
3.266
3.201
3.3
3.333
3.399
V
V
6V ≤ V
IN
≤ 34V, 0.1A ≤ I
LOAD
≤ 1A
3.168
3.135
3.3
3.432
3.465
V
V
Maximum Duty Cycle V
FB
= 2.5V 93 97 %
Output Leakage Current V
IN
= 34V, V
SHDN
= 5V, V
SW
= 0V 50 500 µA
V
IN
= 34V, V
SHDN
= 5V, V
SW
= –1V 4 20 mA
Quiescent Current V
FB
= 4.0V 7 12 mA
MIC4680-5.0
Output Voltage
(±1%)
(±3%)
4.950
4.85
5.0
5.05
5.15
V
V
8V ≤ V
IN
≤ 34V, 0.1A ≤ I
LOAD
≤ 1A
4.800
4.750
5.0
5.200
5.250
V
V
Maximum Duty Cycle V
FB
= 4.0V 93 97 %
Output Leakage Current V
IN
= 34V, V
SHDN
= 5V, V
SW
= 0V 50 500 µA
V
IN
= 34V, V
SHDN
= 5V, V
SW
= –1V 4 20 mA
Quiescent Current V
FB
= 6.0V 7 12 mA
MIC4680/-3.3/-5.0
Frequency Fold Back 30 50 100 kHz
Oscillator Frequency 180 200 220 kHz
Saturation Voltage I
OUT
= 1A 1.4
1.8
V
Short Circuit
Current Limit
V
FB
= 0V, see Test Circuit 1.3 1.8 2.5 A
V
SHDN
= V
IN
1.5 µA
Standby Quiescent
Current
V
SHDN
= 5V (regulator off) 30 100 µA