MIC4681_05 Datasheet, PDF (3/16 Pages) Micrel Semiconductor – 2A-Peak SuperSwitcher SOP-8 Buck Regulator

MIC4681
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
Micrel
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
Condition
Min
Feedback Voltage
(±1%)
(±2%)
1.217
1.205
8V ≤ V_IN ≤ 30V, 0.1A ≤ I_LOAD ≤ 1A, V_OUT = 5V
1.193
1.180
Maximum Duty Cycle
V_FB = 1.0V
93
Output Leakage Current
V_IN = 30V, V_SHDN = 5V, V_SW = 0V
V_IN = 30V, V_SHDN = 5V, V_SW = –1V
Quiescent Current
V_FB = 1.5V
Frequency Fold Back
Oscillator Frequency
180
Saturation Voltage
I_OUT = 1A
Typ
1.230
1.230
95
50
4
7
50
200
1.4
Max
1.243
1.255
1.267
1.280
500
20
12
110
220
1.8
Units
V
V
V
V
%
µA
mA
mA
kHz
kHz
V
Short Circuit Current Limit
Standby Quiescent Current
Shutdown Input Logic Level
V_FB = 0V, see Test Circuit V_IN = 30V (Note 8)
V_SHDN = 5V (regulator off)
V_SHDN = V_IN
regulator off
2.2
3.4
4.5
A
35
100
µA
6
µA
2
1.4
V
regulator on
1.25 0.8
V
Shutdown Input Current
Thermal Shutdown @ T_J
V_SHDN = 5V (regulator off)
V_SHDN = 0V (regulator on)
–10 –0.5
1
µA
–10 –1.5
1
µA
160
°C
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.
April 2005
3
MIC4681