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| MIC2178 Datasheet, PDF (6/16 Pages) Micrel Semiconductor – 2.5A Synchronous Buck Regulator | |||
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MIC2178
Block Diagram
UVLO,
Thermal
Shutdown
Enable
Shutdown
EN
20
3.3V
Regulator
BIAS
19
0.01µF
internal
supply Voltage
Skip Mode
PWM Mode
PWM
10
PWM/
Skip-Mode
Select
Corrective
Ramp
Stop
SYNC
200kHz
18
Oscillator
Reset
Pulse
R
Q
S
RC COMP
13
CC
MIC2178 [Adjustable]
VIN
4.5V to 16.5V
VIN 1 2 9
100µF
Micrel
Output
Control
Logic
ILIMIT
Comp.
ILIMIT
Thresh.
Voltage
ISENSE
Amp.
100mâ¦
P-channel
100mâ¦
N-channel
VOUT
SW
3
8
R1
1.245
R2
L
1
VOUT
PGND
4
5
6
7
D
COUT
*
* Connect
SGND to PGND
Bold lines indicate
high current traces
Skip-Mode
Comp.
PWM
Comp.
VREF 1.245V
SGND 14 15 16 17
Power Good
Comp.
1.13V
FB
12
VIN
20k
PWRGD
11
R1
R2
Output Good
MIC2178
6
June 1998
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