Micrel, Inc.

MIC38300

July 2007

3

M9999-070607

(408) 944-0800

Pin Configuration

SW

5

1

SW

SW

SW

SW

2

3

4

10

6

7

8

9

24

28

27

26

25

23

11

19

22

21

20

18

16

13

14

15

17

12

SW

SWO

SWO

SWO

SWO

SWO

SW

FB

ePAD

AVIN

LPF

AGND

PGND

ePAD

PGND

PGND

EN

28-Pin 4mm x 6mm MLF

(Top View)

Pin Description

Pin Number

MIC38300HYHL

Pin Name

Pin Name

1, 2, 3, 4, 5

SWO

Switch (Output): This is the output of the PFM Switcher.

6, 23, 24, 25,

26, 27, 28

SW

Switch Node: Floating for typical applications. Attach external resistor from

LPF to increase hysteretic frequency.

7, 22

ePAD

Exposed heat-sink pad. Recommend to connect to PGND.

8

AVIN

Analog Supply Voltage: Supply for the analog control circuitry. Requires

bypass capacitor to ground.

9

LPF

Low Pass Filter: Floating for typical applications. Attach external resistor

from SW to increase hysteretic frequency.

10

AGND

Analog Ground.

11

FB

Feedback: Input to the error amplifier. Connect to the external resistor

divider network to set the output voltage.

12, 13

LDOOUT

LDO Output (Output): Output of voltage regulator. Place capacitor to ground

to bypass the output voltage. Nominal bypass capacitor is 10µF.

14, 15

LDOIN

LDO Input: Connect to SW output. Requires a bypass capacitor to ground.

16, 17

PVIN

Input Supply Voltage (Input): Requires bypass capacitor to GND.

18

EN

Enable (Input): Logic low will shut down the device, reducing the quiescent

current to less than 50µA. This pin can also be used as an under-voltage

lockout function by connecting a resistor divider from EN/UVLO pin to VIN

and GND.

19, 20, 21

PGND

Power Ground.