MIC23158_13 Datasheet, PDF (3/21 Pages) Micrel Semiconductor – 3MHz PWM Dual 2A Buck Regulator with HyperLight Load and Power Good

Micrel Inc.
MIC23158/9
Pin Description (Continued)
Pin Number
(Adjustable)
8
9
10
11
12
13
14
15
16
17
18
19
20
EP
Pin Name
Pin Function
AGND2
EN2
SNS2
FB2
PG2
SS2
SS1
PG1
FB1
SNS1
EN1
AGND1
AVIN1
ePad
Analog Ground for Regulator 2. Connect to a central ground point where all high current paths meet
(CIN, COUT, PGND2) for best operation.
Enable Input for Regulator 2. Logic high enables operation of regulator 2. Logic low will shut down
regulator 2. Do not leave floating.
Sense Input for Regulator 2. Connect to the output of regulator 2 as close to the output capacitor as
possible to accurately sense the output voltage.
Feedback Input for Regulator 2. Connect a resistor divider from the output of regulator 2 to ground to
set the output voltage.
Power Good Output for Regulator 2. Open drain output for the power good indicator for output 2. Use
a pull-up resistor between this pin and VOUT2 to indicate a power good condition.
Soft-Start for Regulator 2. Connect a minimum of 200pF capacitor to ground to set the turn-on time of
regulator 2. Do not leave floating.
Soft-Start for Regulator 1. Connect a minimum of 200pF capacitor to ground to set the turn-on time of
regulator 1. Do not leave floating.
Power Good Output for Regulator 1. Open drain output for the power good indicator for output 1. Use
a pull-up resistor between this pin and VOUT1 to indicate a power good condition.
Feedback Input for Regulator 1. Connect a resistor divider from the output of regulator 1 to ground to
set the output voltage.
Sense Input for Regulator 1. Connect to the output of regulator 1 as close to the output capacitor as
possible to accurately sense the output voltage.
Enable Input for Regulator 1. Logic high enables operation of regulator 1. Logic low will shut down
regulator 1. Do not leave floating.
Analog Ground for Regulator 1. Connect to a central ground point where all high current paths meet
(CIN, COUT, PGND1) for best operation.
Analog Input Voltage for Regulator 1. Tie to VIN1 and connect a capacitor to ground to decouple
noise.
Exposed Heat Sink Pad. Connect to PGND.
November 2012
3
M9999-110812-A