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MIC2178BWM 数据表(PDF) 3 Page - Micrel Semiconductor

部件名 MIC2178BWM
功能描述  2.5A Synchronous Buck Regulator
PDF  16 Pages
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制造商  MICREL [Micrel Semiconductor]
网页  http://www.micrel.com
标志 MICREL - Micrel Semiconductor

MIC2178BWM 数据表(HTML) 3 Page - Micrel Semiconductor

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June 1998
3
MIC2178
MIC2178
Micrel
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, VPWM) ................. 18V
Sync Voltage (V
SYNC) ..................................................... 6V
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; TA = 25°C, bold indicates –40°C ≤ TA ≤ 85°C; unless noted.
Symbol
Parameter
Condition
Min
Typ
Max
Units
I
SS
Input Supply Current
PWM mode, output not switching,
1.0
1.5
mA
4.5V
≤ V
IN ≤ 16.5V
skip mode, output not switching,
600
750
µA
4.5V
≤ V
IN ≤ 16.5V
V
EN = 0V, 4.5V ≤ VIN ≤ 16.5V
1
25
µA
V
BIAS
Bias Regulator Output Voltage
V
IN = 16.5V
3.10
3.30
3.4
V
V
FB
Feedback Voltage
MIC2178 [adj.]: V
OUT = 3.3V, ILOAD = 0
1.22
1.245
1.27
V
V
OUT
Output Voltage
MIC2178 [adj.]: V
OUT = 3.3V,
3.20
3.3
3.40
V
5V
≤ V
IN ≤ 16V, 10mA ≤ ILOAD ≤ 2A
3.14
3.46
V
MIC2178-5.0: I
LOAD = 0
4.85
5.0
5.15
V
MIC2178-5.0:
4.85
5.0
5.15
6V
≤ V
IN ≤ 16V, 10mA ≤ ILOAD ≤ 2A
4.75
5.25
V
MIC2178-3.3: I
LOAD = 0
3.20
3.3
3.40
V
MIC2178-3.3:
3.20
3.3
3.40
V
5V
≤ V
IN ≤ 16V, 10mA ≤ ILOAD ≤ 2A
3.14
3.46
V
V
TH
Undervoltage Lockout
upper threshold
4.25
4.35
V
V
TL
lower threshold
3.90
4.15
V
I
FB
Feedback Bias Current
MIC2178 [adj.]
60
150
nA
MIC2178-5.0, MIC2178-3.3
20
40
µA
A
VOL
Error Amplifier Gain
0.6V
≤ V
COMP ≤ 0.8V
15
18
20
Error Amplifier Output Swing
upper limit
0.9
1.5
V
lower limit
0.05
0.1
V
Error Amplifier Output Current
source and sink
15
25
35
µA
f
O
Oscillator Frequency
160
200
240
kHz
D
MAX
Maximum Duty Cycle
V
FB = 1.0V
100
%
t
ON min
Minimum On-Time
V
FB = 1.5V
300
400
ns
SYNC Frequency Range
220
300
kHz
SYNC Threshold
0.8
1.6
2.2
V
SYNC Minimum Pulse Width
500
ns
I
SYNC
SYNC Leakage
V
SYNC = 0V to 5.5V
–1
0.01
1
µA
I
LIM
Current Limit
PWM mode, V
IN = 12V
3.8
4.7
5.7
A
skip mode
600
mA
R
ON
Switch On-Resistance
high-side switch, V
IN = 12V
90
250
m
Ω
low-side switch, V
IN = 12V
110
250
m
Ω
I
SW
Output Switch Leakage
V
SW = 16.5V
1
10
µA



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