MIC4682_07 Datasheet, PDF (3/15 Pages) Micrel Semiconductor – Precision Current Limit SOIC-8 SuperSwitcher™ Buck Regulator

Micrel, Inc.
MIC4682
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 (V_FB) .................................................12V
Current Limit Set Voltage (V_ISET) ....................... 1.23V to 7V
Ambient Storage Temperature (T_s) ...........–65°C to +150°C
ESD Rating⁽⁵⁾.................................................................. 2kV
Operating Ratings⁽²⁾
Supply Voltage (V_IN)^{(4, 7)} ....................................... 4V to 34V
Junction Temperature Range (T_J)............. –40°C to +125°C
Thermal Resistance Impedance
SOIC (θ_JA)⁽⁶⁾ .......................................................63°C/W
SOIC (θ_JC)⁽⁶⁾ .......................................................20°C/W
Electrical Characteristics
V_IN = 12V; I_OUT = 500mA; R_ISET = 16.2k (1A current limit); T_J = 25°C, bold values indicate –40°C< T_J < +125°C, unless noted.
Symbol Parameter
Condition
Min Typ Max Units
V_IN
Supply Voltage Range
Note 4
4
34
V
I_IN
Quiescent Current
V_FB = 1.5V
7
12
mA
Standby Quiescent Current
V_SHDN = 5V (Regulator off)
35
100
µA
V_SHDN = V_IN
1
µA
V_FB
Feedback Voltage
(±1%)
(±2%)
1.217 1.230 1.243
V
1.205
1.255
V
8V ≤ V_IN ≤ 34V, 0.1A ≤ I_LOAD ≤ 0.8A
1.193 1.230 1.267
V
1.180
1.280
V
I_LIM
Current Limit Accuracy, Note 7 See Test Circuit, V_OUT = 3.6V
0.9
1
1.1
A
f_SW
Oscillator Frequency
180 200
220
kHz
D_MAX
Maximum Duty Cycle
V_FB = 1.0V
93
95
%
V_SW
Switch Saturation Voltage
I_OUT = 1A
1.4
1.8
V
I_SW
Switch Leakage Current
V_IN = 34V, V_SHDN = 5V, V_SW = 0V
2
100
µA
V_IN = 34V, V_SHDN = 5V, V_SW = –1V
2
10
mA
V_SHDN
Shutdown Input Logic Level
Regulator Off
2
1.4
V
Regulator On
1.25
0.8
V
I_SHDN
Shutdown Input Current
V_SHDN = 5V (Regulator Off)
–10 –0.5
1
µA
V_SHDN = 0V (Regulator On)
–10 –0.5
1
µA
T_J
Thermal Shutdown
160
°C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Absolute maximum rating is intended for voltage transients only; prolonged DC operation is not recommended.
4. V_IN(MIN) = VOUT + 2.5V or 4V whichever is greater.
5. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
6. Measured on 1.5” square of 1oz. copper FR4 printed circuit board connected to the device ground leads.
7. Short circuit protection is guaranteed to V_IN = 30V max.
June 2007
3
M9999-061507