MIC3385_15 Datasheet, PDF (3/15 Pages) Micrel Semiconductor – 8MHz Inductorless Buck Regulator with LDO Standby Mode

Micrel, Inc.
Pin Configuration
FB 1
VIN 2
LOWQ 3
EN 4
OUT 5
OUT 6
OUT 7
14 BIAS
13 LDO
12 AVIN
11 GND
10 SW
9 SW
8 SW
14- Pin 3mm x 3.5mm MLF^® (HL)
MIC3385
Pin Description
Pin Number
1
Pin Name
FB
2
VIN
3
LOWQ
4
EN
5,6,7
8,9,10
11
12
OUT
SW
GND
AVIN
13
LDO
14
BIAS
Pin Function
Feedback. Input to the error amplifier. Connect to the external resistor divider network to set
the output voltage.
Supply Voltage (Input): Supply voltage for the internal switches and drivers.
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.
Enable (Input). Logic low will shut down the device, reducing the quiescent current to less
than 5µA.
Switch Output after inductor.
Switch (Output): Internal power MOSFET output switches before Inductor
Power Ground. Requires input capacitor to GND.
Analog Supply Voltage (Input): Supply voltage for the analog control circuitry and LDO input
power. Requires bypass capacitor to GND.
LDO Output (Output): Connect to VOUT for LDO mode operation.
Internal circuit bias supply. Must be de-coupled to signal ground with a 0.1µF capacitor and
should not be loaded.
September 22, 2015
3
Revision 3.0