MAX17543 datasheet(10/19 Pages) MAXIM

10 / 19 page

NAME

FUNCTION

1–3

VIN

Power Supply Input. 4.5V to 42V input supply range. Connect the VIN pins together. Decouple to PGND

with a 2.2µF capacitor; place the capacitor close to the VIN and PGND pins. Refer to the MAX17543 EV

kit data sheet for a layout example.

EN/UVLO

Enable/Undervoltage Lockout. Drive EN/UVLO high to enable the output voltage. Connect to the center

of the resistor-divider between VIN and SGND to set the input voltage at which the device turns on. Pull

up to VIN for always-on operation.

RESET Open-Drain RESET Output. The RESET output is driven low if FB drops below 92% of its set value.

RESET goes high 1024 clock cycles after FB rises above 95% of its set value.

SYNC

The device can be synchronized to an external clock using this pin. See the External Frequency

Synchronization section for more details.

Soft-Start Input. Connect a capacitor from SS to SGND to set the soft-start time.

At switching frequencies lower than 500kHz, connect a capacitor from CF to FB. Leave CF open if

switching frequency is equal to, or greater than, 500kHz. See the Loop Compensation section for more

details.

Feedback Input. Connect FB to the center tap of an external resistor-divider from the output to GND to

set the output voltage. See the Adjusting Output Voltage section for more details.

Connect a resistor from RT to SGND to set the regulator’s switching frequency. Leave RT open for the

default 500kHz frequency. See the Setting the Switching Frequency (RT) section for more details.

MODE

MODE pin configures the device to operate either in PWM, PFM, or DCM modes of operation. Leave

MODE unconnected for PFM operation (pulse-skipping at light loads). Connect MODE to SGND for

constant-frequency PWM operation at all loads. Connect MODE to VCC for DCM operation. See the

MODE Setting section for more details.

* EXPOSED PAD (CONNECT TO GROUND).

BST

SYNC

10 RT

PGND

TQFN

4mm × 4mm

MAX17543

TOP VIEW

MAX17543

4.5V–42V, 2.5A, High-Efficiency,

Synchronous Step-Down DC-DC Converter

with Internal Compensation

www.maximintegrated.com

Maxim Integrated │ 10

Pin Description

Pin Configuration

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