MIC4685
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
),
Note 1 ......................................
+34V
Enable Voltage (V
EN
) .................................... –0.3V to +V
IN
Steady-State Output Switch Voltage (V
SW
) ....... –1V to V
IN
Feedback Voltage (V
FB
) .............................................. +12V
Storage Temperature (T
S
) ....................... –65°C to +150°C
ESD Rating
Note 3 .......................................................
2kV
Operating Ratings
(Note 2)
Supply Voltage (V
IN
)
Note 4 ...........................
+4V to +30V
Junction Temperature (T
J
) ....................... –40°C to +125°C
Package Thermal Resistance
θ
JA
, SPAK-7 Lead ............................................ 11.8°C/W
θ
JC
, SPAK-7 Lead .............................................. 2.2°C/W
Electrical Characteristics
V
IN
= V
EN
= 12V, V
OUT
= 5V; I
OUT
= 500mA; T
A
= 25°C, unless otherwise noted.
Bold
values indicate –40°C
≤
T
J
≤
+125°C.
Parameter
Feedback Voltage
Condition
(±2%)
(±3%)
8V
≤
V
IN
≤
30V, 0.1A
≤
I
LOAD
≤
1A, V
OUT
= 5V,
Note 4
Feedback Bias Current
Maximum Duty Cycle
Output Leakage Current
V
FB
= 1.0V
V
IN
= 30V, V
EN
= 0V, V
SW
= 0V
V
IN
= 30V, V
EN
= 0V, V
SW
= –1V
Quiescent Current
Bootstrap Drive Current
Bootstrap Voltage
Frequency Fold Back
Oscillator Frequency
Saturation Voltage
Short Circuit Current Limit
Shutdown Current
Enable Input Logic Level
I
OUT
= 1A
V
FB
= 0V, See
Test Circuit
V
EN
= 0V
regulator on
regulator off
Enable Pin Input Current
V
EN
= 0V (regulator off)
V
EN
= 12V (regulator on)
Thermal Shutdown @ T
J
Note 1.
Note 2.
Note 3.
Note 4.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
2.5V of headroom is required between V
IN
and V
OUT
. The headroom can be reduced by implementing a bootstrap diode as seen on the 5V to
3.3V circuit on page 1.
Min
1.210
1.198
1.186
1.173
Typ
1.235
1.235
50
94
5
1.4
6
Max
1.260
1.272
1.284
1.297
Units
V
V
V
V
nA
%
µA
mA
mA
mA
V
500
20
12
V
FB
= 1.5V
V
FB
= 1.5V, V
SW
= 0V
I
BS
= 10mA, V
FB
= 1.5V, V
SW
= 0V
V
FB
= 0V
250
5.5
30
180
380
6.2
70
200
0.59
120
225
kHz
kHz
V
3.5
150
2
6
200
A
µA
V
0.8
16
–1
–0.83
160
50
V
µA
mA
°C
September 2002
3
MIC4685
MICREL [ MICREL SEMICONDUCTOR ]
