MIC23201 Datasheet, PDF (12/20 Pages) Micrel Semiconductor – 2MHz PWM 2A Buck Regulator

Micrel Inc.
SNS connection should be placed close to the output
capacitor. Refer to the layout recommendations for more
details.
AGND
The analog ground (AGND) is the ground path for the
biasing and control circuitry. The current loop for the
signal ground should be separate from the power ground
(PGND) loop. Refer to the layout recommendations for
more details.
PGND
The power ground pin is the ground path for the high
current. The current loop for the power ground should be
as small as possible and separate from the analog
ground (AGND) loop as applicable. Refer to the layout
recommendations for more details.
FB
The FB pin is regulated to 0.62V. A resistor divider
connecting the feedback to the output is used to adjust
the desired output voltage. A resistor divider network is
connected to this pin from the output and is compared to
MIC23201
the internal 0.62V reference within the regulation loop.
The output voltage can be programmed using the
following equation:
V_OUT

V_REF
 1 

R1 _
R2 _
where:
R1 is the top resistor, R2 is the bottom resistor. The
output voltage can be adjusted from 0.95V to 3.6V.
PG
The power good (PG) pin is an open drain output which
indicates logic high when the output voltage is typically
above 87% of its steady state voltage. A pull-up resistor
of more than 5kΩ should be connected from PG to V_OUT.
August 2012
12
M9999-082912-A