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MIC2178-3.3BWM
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
MIC2178
Micrel, Inc.
M9999-031805
4
March 2005
Symbol
Parameter
Condition
Min
Typ
Max
Units
Enable Threshold
0.8
1.6
2.2
V
I
EN
Enable Leakage
V
EN
= 0V to 5.5V
–1
0.01
1
µ
A
PWM Threshold
0.6
1.1
1.4
V
I
PWM
PWM Leakage
V
PWM
= 0V to 5.5V
–1
0.01
1
µ
A
PWRGD Threshold
MIC2178 [adj.]: measured at FB pin
1.09
1.13
1.17
V
MIC2178-5.0: measured at FB pin
4.33
4.54
4.75
V
MIC2178-3.3: measured at FB pin
2.87
3.00
3.13
V
PWRGD Output Low
I
SINK
= 1.0mA
0.25
0.4
V
PWRGD Off Leakage
V
PWRGD
= 5.5V
0.01
1
µ
A
General Note:
Devices are ESD sensitive. Handling precautions recommended.
March 2005
5
M9999-031805
MIC2178
Micrel, Inc.
T
ypical Characteristics
175
180
185
190
195
200
205
-60
-30
0
30
60
90
120
150
FREQUENCY (kHz)
TEMPERATURE (
°
C)
Oscillator Frequency
vs. Temperature
1.238
1.240
1.242
1.244
1.246
1.248
1.250
1.252
-60
-30
0
30
60
90
120
150
REFERENCE VOLTAGE (V)
TEMPERATURE (
°
C)
Reference Voltage
vs. Temperature
MIC2178 [adj.]
3.280
3.285
3.290
3.295
3.300
3.305
3.310
3.315
3.320
-60
-30
0
30
60
90
120
150
REFERENCE VOLTAGE (V)
TEMPERATURE (
°
C)
Reference Voltage
vs. Temperature
MIC2178-3.3
4.970
4.980
4.990
5.000
5.010
5.020
5.030
-60
-30
0
30
60
90
120
150
REFERENCE VOLTAGE (V)
TEMPERATURE (
°
C)
Reference Voltage
vs. Temperature
MIC2178-5.0
16.0
16.5
17.0
17.5
18.0
18.5
19.0
-60
-30
0
30
60
90
120
150
AMPLIFIER VOLTAGE GAIN
TEMPERATURE (
°
C)
Error-Amplifier Gain
vs. Temperature
0
20
40
60
80
100
120
-60
-30
0
30
60
90
120
150
BIAS CURRENT (nA)
TEMPERATURE (
°
C)
Feedback Input Bias Current
vs. Temperature
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
-60
-30
0
30
60
90
120
150
CURRENT LIMIT (A)
TEMPERATURE (
°
C)
Current Limit
vs. Temperature
0
50
100
150
200
250
246
8
1
0
1
2
1
41
6
1
8
ON-RESISTANCE (m
Ω
)
INPUT VOLTAGE (V)
High-Side Switch
On-Resistance
125
°
C
85
°
C
25
°
C
0
°
C
0
50
100
150
200
250
300
350
246
8
1
0
1
2
1
41
6
1
8
ON-RESISTANCE (m
Ω
)
INPUT VOLTAGE (V)
Low-Side Switch
On-Resistance
125
°
C
85
°
C
25
°
C
0
°
C
0
2
4
6
8
10
12
246
8
1
0
1
2
1
41
6
1
8
SUPPLY CURRENT (mA)
INPUT VOLTAGE (V)
PWM-Mode
Supply Current
OUTPUT
SWITCHING
60
65
70
75
80
85
90
95
100
10
100
1000
2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
V
IN
= 5V
8V
12V
3.3V Output
Efficiency
SKIP
PWM
70
75
80
85
90
95
100
10
100
1000
2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
8V
12V
5V Output
Efficiency
V
IN
= 6V
SKIP
PWM
MIC2178
Micrel, Inc.
M9999-031805
6
March 2005
Block Diagram
SW
PGND
I
SENSE
Amp.
PWM/
Skip-Mode
Select
V
REF
1.245V
100m
Ω
N-channel
100m
Ω
P-channel
COMP
VIN
Skip-Mode
Comp.
I
LIMIT
Comp.
Output
Control
Logic
Pow
e
r
Good
Comp.
1.13V
R
S
Q
200kHz
Oscillator
PWM
Comp.
3.3V
Regulator
UVLO
,
Thermal
Shutdown
V
OUT
L
FB
SGND
C
C
PWRGD
0.01
µ
F
10k
EN
BIAS
V
IN
4.5V to 16.5V
100
µ
F
SYNC
C
OUT
MIC2178 [Adjustable]
internal
supply V
oltage
Enable
Shutdown
Stop
20
19
18
11
13
2
1
3
8
D
4
5
6
7
R1
R2
12
14
15
16
17
Bold
lines indicate
high current traces
I
LIMIT
Thresh.
Vo
l
t
age
PWM
Skip Mode
PWM Mode
10
V
IN
Output Good
20k
*
*C
onnect
S
GND
to P
GND
R
C
Reset
Pulse
Corrective
Ramp
V
OUT
1.245
R1
R2
1
9
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
MIC2178-3.3BWM
Mfr. #:
Buy MIC2178-3.3BWM
Manufacturer:
Description:
Voltage Regulators - Switching Regulators 2.5A 200kHz Synchronous Switche
Lifecycle:
New from this manufacturer.
Delivery:
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EMS
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