MIC4681
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
),
Note 3
...................................... +34V
Shutdown Voltage (V
SHDN
) .......................... –0.3V to +34V
Steady-State Output Switch Voltage (V
SW
) .................. –1V
Feedback Voltage [Adjustable] (V
FB
) .......................... +12V
Storage Temperature (T
S
) ....................... –65°C to +150°C
ESD,
Note 5
Operating Ratings
(Note 2)
Supply Voltage (V
IN
) ....................................... +4V to +30V
Junction Temperature (T
J
) ...................................... +125°C
Package Thermal Resistance (θ
JA
),
Note 6
............ 63°C/W
(θ
JC
),
Note 6 ...........
20°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
Feedback Voltage
Condition
(±1%)
(±2%)
8V
≤
V
IN
≤
30V, 0.1A
≤
I
LOAD
≤
1A, V
OUT
= 5V
Maximum Duty Cycle
Output Leakage Current
V
FB
= 1.0V
V
IN
= 30V, V
SHDN
= 5V, V
SW
= 0V
V
IN
= 30V, V
SHDN
= 5V, V
SW
= –1V
Quiescent Current
Frequency Fold Back
Oscillator Frequency
Saturation Voltage
Short Circuit Current Limit
Standby Quiescent Current
I
OUT
= 1A
V
FB
= 0V, see
Test Circuit
V
IN
= 30V
(Note 8)
V
SHDN
= 5V (regulator off)
V
SHDN
= V
IN
Shutdown Input Logic Level
regulator off
regulator on
Shutdown Input Current
V
SHDN
= 5V (regulator off)
V
SHDN
= 0V (regulator on)
Thermal Shutdown @ T
J
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Note 8.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Absolute maximum rating is intended for voltage transients only, prolonged dc operation is not recommended.
V
IN(min)
= V
OUT
+ 2.5V or 4V whichever is greater.
Devices are ESD sensitive. Handling precautions recommended.
Measured on 1" square of 1 oz. copper FR4 printed circuit board connected to the device ground leads.
Test at T
A
= +85°C, guaranteed by design, and characterized to T
J
= +125°C.
Short circuit protection is guaranteed to 30V max.
Min
1.217
1.205
1.193
1.180
93
Typ
1.230
1.230
95
50
4
7
50
Max
1.243
1.255
1.267
1.280
Units
V
V
V
V
%
µA
mA
mA
kHz
kHz
V
A
µA
µA
V
500
20
12
110
220
1.8
4.5
100
V
FB
= 1.5V
180
200
1.4
2.2
3.4
35
6
2
1.4
1.25
0.8
1
1
V
µA
µA
°C
–10
–10
–0.5
–1.5
160
February 2001
3
MIC4681
MICREL [ MICREL SEMICONDUCTOR ]
