Micrel, Inc.
MIC3385
May 2010
2
M9999-051310-B
Ordering Information
Part Number
Voltage Temperature Range
Package
Lead Finish
MIC3385YHL
Adj.
40?to +125癈
14-Pin 3mm x 3.5mm MLF
?/DIV>
Pb-free
MIC3385-1.5YHL
1.5V
40?to +125癈
14-Pin 3mm x 3.5mm MLF
?/DIV>
Pb-free
Notes:
1. MLF?is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
2. Other voltage options available. Please contact Micrel for details.
Pin Configuration
OUT
SW
7
3
LOWQ
EN
OUT
OUT
12 AVIN
GND
SW
SW
11
10
9
4
5
6
8
1
FB
VIN
14 BIAS
LDO
13
2
14- Pin 3mm x 3.5mm MLF
?/DIV>
(HL)
Pin Description
Pin Number Pin Name Pin Function
1
FB Feedback. Input to the error amplifier. Connect to the external resistor divider network to set
the output voltage.
2
VIN Supply Voltage (Input): Supply voltage for the internal switches and drivers.
3
LOWQ Enable LDO Mode (Input): Logic low enables the internal LDO and disables the PWM
operation. Logic high enables the PWM mode and disables the LDO mode.
4
EN Enable (Input). Logic low will shut down the device, reducing the quiescent current to less
than 5糀.
5,6,7
OUT Switch Output after inductor.
8,9,10
SW Switch (Output): Internal power MOSFET output switches before Inductor
11
GND
Power Ground. Requires input capacitor to GND.
12
AVIN Analog Supply Voltage (Input): Supply voltage for the analog control circuitry and LDO input
power. Requires bypass capacitor to GND.
13
LDO LDO Output (Output): Connect to V
OUT
for LDO mode operation.
14
BIAS
Internal circuit bias supply. Must be de-coupled to signal ground with a 0.1糉 capacitor and
should not be loaded.
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