PIN

NAME

FUNCTION

MAX15014/

MAX15017

MAX15015/

MAX15016

1–3, 9, 12, 14,

16, 19, 24, 26,

27, 30, 35

1–3, 9, 12, 14,

16, 19, 24, 26,

27, 30, 35

N.C.

No Connection. Not internally connected. Leave unconnected or connect to SGND.

23, 28

—

I.C.

Internally Connected. Leave unconnected.

4

4

RESET

threshold, RESET goes high after an adjustable delay. Pull up RESET to LDO_OUT

with at least 4kΩ. RESET is an active-low open-drain output.

5

5

SGND

Signal Ground Connection. Connect SGND and PGND together at one point near

the input bypass capacitor negative terminal.

6

6

CT

Reset Timeout Delay Capacitor Connection. CT is pulled low during reset. When out

of reset, CT is pulled up to an internal 3.6V rail with a 2µA current source. When the

rising CT voltage reaches the trip threshold (typically 1.24V), RESET is deasserted.

When EN_SYS is low or in thermal shutdown, CT is low.

7

7

EN_SW

Switching Regulator Enable Input (Active High). If EN_SW is high and EN_SYS is

high, the switching power supply is enabled. EN_SW is internally pulled down to

SGND through a 0.5µA current sink.

8

8

EN_SYS

Active-High System Enable Input. Connect EN_SYS high to turn on the system. The

LDO is active if EN_SYS is high; once EN_SYS is high, the switching regulator can

be turned on if EN_SW is high. EN_SYS is internally pulled down to SGND through

a 0.5µA current sink.

10

10

SET_LDO

LDO Feedback Input/Output Voltage Setting. Connect SET_LDO to SGND to select

the preset output voltage (5V or 3.3V). Connect SET_LDO to an external resistor-

divider network for adjustable output operation.

11

11

LDO_

OUT

Linear Regulator Output. Bypass with at least 10µF low-ESR capacitor from LDO_

OUT to SGND. In the 5V LDO versions (A), the LDO operates in dropout below 6V

down to the UVLO trip point.

13

13

IN_LDO

LDO Input Voltage. The input voltage range for the LDO extends from 5V to 40V.

Bypass with a 0.1µF ceramic capacitor to SGND.

15

15

BST

High-Side Gate Driver Supply. Connect BST to the cathode of the bootstrap diode

and to the positive terminal of the bootstrap capacitor.

17, 18

17, 18

LX

Source Connection of Internal High-Side Switch. Connect both LX pins to the

inductor and the cathode of the freewheeling diode.

20, 21

20, 21

DRAIN

Drain Connection of the Internal High-Side Switch. Connect both DRAIN inputs

together.

22

22

PGND

Power Ground Connection. Connect the input bypass capacitor negative terminal,

the anode of the freewheeling diode, and the output filter capacitor negative terminal

to PGND. Connect PGND to SGND together at a single point near the input bypass

capacitor negative terminal.

MAX15014–MAX15017

1A, 4.5V to 40V Input Buck Converters with

50mA Auxiliary LDO Regulators

www.maximintegrated.com

Maxim Integrated │ 12

Pin Description