MIC2177 Ver la hoja de datos (PDF) - Micrel
Número de pieza
componentes Descripción
Fabricante
MIC2177 Datasheet PDF : 15 Pages
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Micrel, Inc.
MIC2177
Absolute Maximum Ratings
Supply Voltage [100ms transient] (VIN) ..........................18V
Output Switch Voltage (VSW). .........................................18V
Output Switch Current (ISW)...........................................6.0A
Enable, Output-Sense Voltage (VEN, VOUT). ...................18V
Sync Voltage (VSYNC)........................................................6V
Operating Ratings
Supply Voltage (VIN)....................................... 4.5V to 16.5V
Junction Temperature (TJ) ........................ –40°C to +125°C
Electrical Characteristics
VIN = 7.0V; TA = 25°C, bold values indicate –40°C< TA < +85°C, unless noted.
Symbol Parameter
Condition
ISS
Input Supply Current
PWM mode, output not switching,
4.5V ≤ VIN ≤ 16.5V
skip mode, output not switching,
4.5V ≤ VIN ≤ 16.5V
VEN = 0V, 4.5V ≤ VIN ≤ 16.5V
VBIAS
Bias Regulator Output Voltage VIN = 16.5V
VFB
VOUT
Feedback Voltage
Output Voltage
MIC2177 [adj.]: VOUT = 3.3V, ILOAD = 0
MIC2177 [adj.]: VOUT = 3.3V,
5V ≤ VIN ≤ 16V, 10mA ≤ ILOAD ≤ 2A
MIC2177-5.0: ILOAD = 0
MIC2177-5.0:
6V ≤ VIN ≤ 16V, 10mA ≤ ILOAD ≤ 2A
MIC2177-3.3: ILOAD = 0
MIC2177-3.3:
5V ≤ VIN ≤ 16V, 10mA ≤ ILOAD ≤ 2A
VTH
Undervoltage Lockout
upper threshold
VTL
lower threshold
IFB
Feedback Bias Current
MIC2177 [adj.]
MIC2177-5.0, MIC2177-3.3
AVOL
Error Amplifier Gain
0.6V ≤ VCOMP ≤ 0.8V
Error Amplifier Output Swing
upper limit
Lower limit
Error Amplifier Output Current source and sink
fO
Oscillator Frequency
DMAX
Maximum Duty Cycle
VFB = 1.0V
tON min
Minimum On-Time
VFB = 1.5V
SYNC Frequency Range
SYNC Threshold
SYNC Minimum Pulse Width
ISYNC
SYNC Leakage
VSYNC = 0V to 5.5V
ILIM
Current Limit
PWM mode, VIN = 12V
skip mode
RON
Switch On-Resistance
high-side switch, VIN = 12V
low-side switch, VIN = 12V
April 2008
4
Min Typ Max
1.0
1.5
500
650
1
25
3.10 3.30 3.40
1.22 1.245 1.27
3.20 3.3
3.40
3.14
3.46
4.85 5.0
5.15
4.85 5.0
5.15
4.75
5.25
3.20 3.3
3.40
3.20 3.3
3.40
3.14
3.46
4.25 4.35
3.9 4.15
60
150
20
40
15
18
20
0.9
1.5
0.05
0.1
15
25
35
160 200
240
100
300
400
220
300
0.8
1.6
2.2
500
–1 0.01
1
3.8
4.7
5.7
600
90
250
110
250
Units
mA
µA
µA
V
V
V
V
V
V
V
V
V
V
V
V
nA
µA
V
V
V
µA
kHz
%
ns
kHz
V
ns
µA
A
mA
mΩ
mΩ
M9999-042108
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