MIC2179_09 Datasheet, PDF (9/13 Pages) Micrel Semiconductor – 1.5A Synchronous Buck Regulator

Micrel, Inc.
PWM-Mode Functional Diagram
V_IN
4.5V to 16.5V
MIC2179
C_IN
VIN _{16 17}
I_{S E N S E}
Amp.
110mΩ
P-channel
110mΩ
N-channel
Stop
S Y NC
13
200kHz
Oscillator
Corrective
Ramp
Reset
Pulse
COMP
C_C
R_C ⁸
R
Q
S
PWM
Comp.
Error
Amp.
V_{R EF}1.245V
MIC2179 [Adjustable] PWM-Mode Signal Path
S G N D ^{9 10 11 12}
( ) V_OUT = 1.245
R1
R2
+
1
SW
3
PGND
1
2
19
20
L1
I_L1
D
C_{O U T}
V_{O U T}
R1
FB
7
R2
V_{S W}
Reset
Pulse
I_{L O A D}
I_{L 1}
∆I_L1
Error Amp.
Output
I_{S E N S E}
June 2009
9
M9999-063009