MIC2178 Datasheet, PDF (3/16 Pages) Micrel Semiconductor – 2.5A Synchronous Buck Regulator

MIC2178
Absolute Maximum Ratings
Supply Voltage [100ms transient] (V_IN) ......................... 18V
Output Switch Voltage (V_SW) ........................................ 18V
Output Switch Current (I_SW) ......................................... 6.0A
Enable, PWM Control Voltage (V_EN, V_PWM) ................. 18V
Sync Voltage (V_SYNC) ..................................................... 6V
Micrel
Operating Ratings
Supply Voltage (V_IN) ..................................... 4.5V to 16.5V
Junction Temperature Range (T_J) ........... –40°C to +125°C
Electrical Characteristics
V_IN = 7.0V; T_A = 25°C, bold indicates –40°C ≤ T_A ≤ 85°C; unless noted.
Symbol
Parameter
Condition
I_SS
V_BIAS
V_FB
V_OUT
V_TH
V_TL
I_FB
Input Supply Current
Bias Regulator Output Voltage
Feedback Voltage
Output Voltage
Undervoltage Lockout
Feedback Bias Current
PWM mode, output not switching,
4.5V ≤ V_IN ≤ 16.5V
skip mode, output not switching,
4.5V ≤ V_IN ≤ 16.5V
V_EN = 0V, 4.5V ≤ V_IN ≤ 16.5V
V_IN = 16.5V
MIC2178 [adj.]: V_OUT = 3.3V, I_LOAD = 0
MIC2178 [adj.]: V_OUT = 3.3V,
5V ≤ V_IN ≤ 16V, 10mA ≤ I_LOAD ≤ 2A
MIC2178-5.0: I_LOAD = 0
MIC2178-5.0:
6V ≤ V_IN ≤ 16V, 10mA ≤ I_LOAD ≤ 2A
MIC2178-3.3: I_LOAD = 0
MIC2178-3.3:
5V ≤ V_IN ≤ 16V, 10mA ≤ I_LOAD ≤ 2A
upper threshold
lower threshold
MIC2178 [adj.]
MIC2178-5.0, MIC2178-3.3
A_VOL
Error Amplifier Gain
Error Amplifier Output Swing
0.6V ≤ V_COMP ≤ 0.8V
upper limit
lower limit
Error Amplifier Output Current
source and sink
f_O
D_MAX
t_{ON min}
Oscillator Frequency
Maximum Duty Cycle
Minimum On-Time
SYNC Frequency Range
V_FB = 1.0V
V_FB = 1.5V
SYNC Threshold
SYNC Minimum Pulse Width
I_SYNC
I_LIM
SYNC Leakage
Current Limit
V_SYNC = 0V to 5.5V
PWM mode, V_IN = 12V
skip mode
R_ON
Switch On-Resistance
I_SW
Output Switch Leakage
high-side switch, V_IN = 12V
low-side switch, V_IN = 12V
V_SW = 16.5V
Min Typ Max Units
1.0
1.5
mA
600 750
µA
1
25
µA
3.10 3.30 3.4
V
1.22 1.245 1.27
V
3.20 3.3 3.40
V
3.14
3.46
V
4.85 5.0 5.15
V
4.85 5.0 5.15
4.75
5.25
V
3.20 3.3 3.40
V
3.20 3.3 3.40
V
3.14
3.46
V
4.25 4.35
V
3.90 4.15
V
60
150
nA
20
40
µA
15
18
20
0.9
1.5
V
0.05 0.1
V
15
25
35
µA
160 200 240 kHz
100
%
300 400
ns
220
300 kHz
0.8
1.6
2.2
V
500
ns
–1 0.01
1
µA
3.8
4.7
5.7
A
600
mA
90
250
mΩ
110 250 mΩ
1
10
µA
June 1998
3
MIC2178