MIC2179 Datasheet, PDF (6/16 Pages) Micrel Semiconductor – 1.5A Synchronous Buck Regulator

MIC2179
Block Diagram
UVLO,
Thermal
Shutdown
Enable
EN
Shutdown
15
3.3V
Regulator
BIAS
14
0.01µF
internal
supply Voltage
Skip Mode
PWM Mode
PWM
5
PWM/
Skip-Mode
Select
Corrective
Ramp
Stop
SYNC
200kHz
13
Oscillator
Reset
Pulse
R
Q
S
R_{C COMP}
8
C_C
MIC2179 [Adjustable]
Micrel
V_IN
4.5V to 16.5V
Output
Control
Logic
I_LIMIT
Comp.
I_LIMIT
Thresh.
Voltage
VIN 16 17
100µF
I_SENSE
Amp.
110mΩ
P-channel
110mΩ
N-channel
R1
V_OUT
1.245
R2
1
SW
L
3
PGND
1
2
19
20
D
C_OUT
*
* Connect
S_GND to P_GND
Bold lines indicate
high current traces
V_OUT
Skip-Mode
Comp.
PWM
Comp.
V_REF 1.245V
SGND ^{9 10 11 12}
Power Good
Comp.
FB
7
V_IN
20k
PWRGD
6
R1
R2
Output Good
1.13V
MIC2179
6
June 1998