MIC2178 Datasheet, PDF (10/16 Pages) Micrel Semiconductor – 2.5A Synchronous Buck Regulator

MIC2178
Skip-Mode Functional Diagram
Output Control Logic
One
Shot
S
Q
R
I_LIMIT
Comp.
I_LIMIT
Thresh.
Voltage
Micrel
V_IN
4.5V to 16.5V
C_IN
VIN 1 2 9
I_SENSE
Amp.
100mΩ
P-channel
V_OUT
R1
1.245
R2
SW
3
L1
8
I_L1
D
C_OUT
PGND
4
5
6
7
1
V_OUT
Skip-Mode
Comp.
MIC2178 [Adjustable] Skip-Mode Signal Path
V_REF 1.245V
SGND ^{14 15 16 17}
R1
FB
12
R2
V_SW
V_IN
V_OUT
0
One-Shot
Pulse
I_LIM
I_L1
0
V_REF + 5mV
V_FB
V_REF – 5mV
MIC2178
10
June 1998