MIC4690_05 Datasheet, PDF (3/12 Pages) Micrel Semiconductor – 500kHz 1A SuperSwitcher Buck Regulator

MIC4690
Absolute Maximum Ratings (Note 1)
Supply Voltage (V_IN), Note 3 ...................................... +34V
Shutdown Voltage (V_SHDN) ............................. –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 4
Micrel
Operating Ratings (Note 2)
Supply Voltage (V_IN) ....................................... +4V to +30V
Junction Temperature Range (T_J) ........... –40°C to +125°C
Package Thermal Resistance
(θ_JA), Note 5 ........................................................ 63°C/W
(θ_JC), ................................................................... 20°C/W
Electrical Characteristics
V_IN = 12V, V_OUT = 5V; I_LOAD = 500mA; V_SHDN = 0V, T_J = 25°C, unless otherwise noted. Bold values indicate –40°C ≤ T_J ≤ +125°C.
Parameter
Condition
Min Typ Max Units
Feedback Voltage
(±1%)
(±2%)
1.217 1.230 1.243 V
1.205
1.255 V
8V ≤ V_IN ≤ 30V, 0.1A ≤ I_LOAD ≤ 1A, V_OUT = 5V
1.193 1.230 1.267 V
1.180
1.280 V
Maximum Duty Cycle
Quiescent Current
Standby Quiescent Current
Frequency Foldback
Oscillator Frequency
V_FB = 1.0V
V_FB = 1.5V
V_SHDN = 5V (regulator off)
V_SHDN = 12V (regulator off)
V_FB = 0V
90
93
%
7
12
mA
30
100
µA
1.5
µA
220 300 KHz
450 500 550 kHz
Saturation Voltage
Output Leakage Current
Short Circuit Current Limit
Shutdown Pin Input Logic Level
I_OUT = 1A
V_IN = 30V, V_SHDN = 5V, V_SW = 0V
V_IN = 30V, V_SHDN = 5V, V_SW = –1V
V_FB = 0V, V_OUT = 0V, See Test Circuit
regulator off
1.2
V
50
500
µA
4
20
mA
1.3
2.5
3.0
A
2
1.5
V
regulator on
1.25 0.8
V
Shutdown Pin Input Current
Thermal Shutdown @ T_J
V_SHDN = 5V (regulator off)
V_SHDN = 0V (regulator on)
–10 –0.7 10
µA
–10 –1.5 10
µA
160
°C
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Exceeding the absolute maximum rating may damage the device.
With input voltages above the operating rating, the device may be damaged if a short-circuit is applied to the output. The device will otherwise
not be damaged up to its absolute maximum voltage rating.
Absolute maximum rating is intended for voltage transients only, prolonged dc operation is not recommended.
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.
April 2005
3
MIC4690