MIC23451 Datasheet, PDF (2/20 Pages) Micrel Semiconductor – 3MHz, 2A Triple Synchronous Buck Regulator

Micrel, Inc.
MIC23451
Ordering Information
Part Number
Marking
Nominal Output
Voltage
Junction Temperature
Range⁽¹⁾
Package^(2,3)
MIC23451-AAAYFL
AAA
Adj./Adj./Adj.
–40°C to +125°C
26-Pin 4mm × 4mm QFN
Notes:
1. Other options are available. Contact Micrel for details.
2. QFN is a Green, RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
3. QFN • = Pin 1 identifier
Lead Finish
Pb-Free
Pin Configuration
26-Pin 4mm × 4mm QFN (FL) − Adjustable
(Top View)
Pin Description
Pin Number
26, 4, 7
Pin Name
SW1, 2, 3
21, 19, 15
EN1, 2, 3
22, 18, 12
23, 17, 14
SNS1, 2, 3
FB1, 2, 3
20, 16, 13
PG1, 2, 3
EP1, 24, 11
AGND
25, 5, 8
3, 6, 9
EP2, 10, 2, 1
PVIN1, 2, 3
AVIN1, 2, 3
PGND
Pin Function
Switch (Output). Internal power MOSFET output switches for output 1/2/3.
Enable (Input). Logic high enables operation of regulator 1/2/3. Logic low will shut down the
device. Do not leave floating.
Sense. Connect to VOUT1,2,3 as close to output capacitor as possible to sense output voltage.
Feedback. Connect a resistor divider from output 1/2/3 to ground to set the output voltage.
Power Good. Open-drain output for the power good indicator for output 1/2/3. Place a resistor
between this pin and a voltage source to detect a power good condition.
Analog Ground. Connect to quiet ground point away from high-current paths, for example, COUT,
for best operation. Must be connected externally to PGND.
Power Input Voltage. Connect a capacitor to PGND to localize loop currents and decouple
switching noise.
Analog Input Voltage. Connect a capacitor to AGND to decouple noise.
Power Ground.
November 5, 2013
2
Revision 1.2