MIC68220 Datasheet, PDF (6/18 Pages) Micrel Semiconductor – Dual 2A LDO Regulator

Micrel
MIC68220
Pin Description (Pin Numbering may change depending on layout considerations)
1,2
3
4
5
6,7
8
9
10
11
12
13
13
14,15
16
17
18
18
19,20
VIN1
Delay1
RC1
EN1
VIN2
Delay2
RC2
EN2
GND
POR2
ADJ2
SNS2
VOUT2
GND
POR1
ADJ1
SNS1
VOUT1
Input: Input voltage supply pin. Place a capacitor to ground to bypass the input
supply
Delay. Capacitor to ground sets internal delay timer. Timer delays power-on reset
(POR) output at turn-on, and ramp down at turn-off.
Ramp Control. May be voltage driven for tracking applications, or a capacitor to
ground will set the slew rate of output voltage during start-up.
Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown
Input: Input voltage supply pin. Place a capacitor to ground to bypass the input
supply
Delay. Capacitor to ground sets internal delay timer. Timer delays power-on reset
(POR) output at turn-on, and ramp down at turn-off.
Ramp Control. May be voltage driven for tracking applications, or a capacitor to
ground will set the slew rate of output voltage during start-up.
Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown
Ground
Power-on Reset: Open-drain output device indicates when the output is in regulation.
High (open) means device is regulating within 10%. POR onset can be delayed using
a single capacitor from Delay to ground.
Adjustable regulators: Feedback input. Connect to external resistor voltage divider.
Fixed Output Voltage Regulators: Sense pin. Connect directly to VOUT2
Output Voltage: Output of voltage regulator. Place capacitor to ground to bypass the
output voltage. Minimum load current is 100uA. Nominal bypass capacitor is 4.7uf.
Ground
Power-on Reset: Open-drain output device indicates when the output is in regulation.
High (open) means device is regulating within 10%. POR onset can be delayed using
a single capacitor from Delay-to-ground.
Adjustable regulators: Feedback input. Connect to external resistor voltage divider.
Fixed Output Voltage Regulators: Sense pin. Connect directly to VOUT1
Output Voltage: Output of voltage regulator. Place capacitor to ground to bypass the
output voltage. Minimum load current is 100uA. Nominal bypass capacitor is 4.7uf.
December 2006
6
M9999-121406
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