MIC261203 Datasheet, PDF (3/31 Pages) Micrel Semiconductor – 28V, 12A Hyper Light Load™ Synchronous DC/DC Buck Regulator

Micrel, Inc.
MIC261203
Pin Description (Continued)
Pin Number Pin Name Pin Function
23
SGND
Signal ground. SGND must be connected directly to the ground planes. Do not route the SGND pin
to the PGND Pad on the top layer, see PCB layout guidelines for details.
Feedback (Input): Input to the transconductance amplifier of the control loop. The FB pin is
24
FB
regulated to 0.8V. A resistor divider connecting the feedback to the output is used to adjust the
desired output voltage.
25
PG
Power Good (Output): Open Drain Output. The PG pin is externally tied with a resistor to VDD. A
high output is asserted when V_OUT > 92% of nominal.
Enable (input): A logic level control of the output. The EN pin is CMOS-compatible. Logic high =
26
EN
enable, logic low = shutdown. In the off state, supply current of the device is greatly reduced
(typically 5µA). The EN pin should not be left open.
27
VIN
Power Supply Voltage (Input): Requires bypass capacitor to SGND.
5V Internal Linear Regulator (Output): VDD supply is the supply bus for the IC control circuit. VDD
28
VDD
is created by internal LDO from V_IN. When V_IN < +5.5V, VDD should be tied to PVIN pins. A 1.0µF
ceramic capacitor from the VDD pin to SGND pins must be place next to the IC.
July 2011
3
M9999-071311-A