MIC3838_05 Datasheet, PDF (4/11 Pages) Micrel Semiconductor – Flexible Push-Pull PWM Controller

MIC3838/3839
Micrel
Absolute Maximum Rating (Note 1)
Supply Voltage (I_DD ≤10mA) ...................................... +15V
Supply Current ........................................................... 20mA
OUTA/OUTB Source Current (peak) ...................... –0.5A
OUTA/OUTB Sink Current (peak) ............................ 1.0A
COMP Pin .................................................................... V_DD
Analog Inputs (FB, ILIM, RAMP) ......... –0.3V to V_DD +0.3V
NOT TO EXCEED 6V
Junction Temperature .............................. –55°C to +150°C
Storage Temperature (T_S) ....................... –65°C to +150°C
Lead Temperature (soldering, 10 sec.) ................... +300°C
ESD Rating, Note 3 ...................................................... 2kV
Operating Ratings (Note 2)
V_DD Input Voltage (V_DD) .......................................... Note 4
Oscillator Frequency (f_OSC) ....................... 10kHz to 1MHz
Ambient Temperature (T_A) ......................... –40°C to +85°C
Package Thermal Resistance
MSOP-10 (θ_JA) .................................................. 115°C/W
Electrical Characteristics (Note 5)
T_A = T_J = –40°C to +85°C, V_DD=10V, Note 10,1µF capacitor from V_DD to GND, R=22kΩ, C=330pF.
Parameter
Condition
Min Typ
Internal Reference Section
Output voltage
Line Regulation
Load Regulation
Oscillator Section
I_OUT = 0mA
MIC3838 9V ≤ V_DD ≤12V
MIC3839 5V ≤ V_DD ≤12V
I_OUT = 1mA
2.85 3.0
2
14
Oscillator Frequency
180 200
Oscillator Amplitude/V_DD
Error Amp Section
Note 6
0.44 0.5
Input Voltage
COMP = 2V
1.95
2
Input Bias Current
–1
Open Loop Voltage Gain
(Guaranteed by design)
60
80
COMP Sink Current
FB = 2.2V, COMP = 1V
0.3
2.5
COMP Source Current
FB = 1.3V, COMP = 3V, Note 7
–0.15 –0.5
COMP PM Clamp Voltage
PWM Section
V_FB = 0V
3.1
3.6
Maximum Duty Cycle
Measured at OUTA or OUTB
48
49
Minimum Duty Cycle
COMP = 0V
Current Sense Section
Gain
Guaranteed by design, Note 8
1.9
2.2
I_LIM Maximum Input Signal
I_LIM to Output Delay
Ramp or I_LIM Source Current
Ramp or I_LIM Sink Current
I_LIM Over Current Threshold
COMP to Ramp Offset
Output Section
Note 9
COMP = 3V, I_LIM from 0mV to 600mV
Ramp = I_LIM = 0.5V, RC = 5.5V Note 10
Ramp = I_LIM = 0V
0.45 0.5
70
–200
5
10
0.7 0.75
0.35 0.8
OUT Low Level
I = 100mA
0.5
OUT High Level
I = –50mA, V_DD – OUT
0.5
Rise Time
C_L = 1nF
25
Fall Time
C_L = 1nF
25
Max Units
3.15
V
10
mV
30
mV
220
0.56
kHz
V/V_DD
2.05
V
1
µA
dB
mA
mA
4.0
V
50
%
0
%
2.5 V/V
0.55
V
200
ns
nA
mA
0.8
V
1.2
V
1
V
1
V
60
ns
60
ns
MIC3838/3839
4
April 2005