SC414 Ver la hoja de datos (PDF) - Semtech Corporation

Número de pieza

componentes Descripción

Fabricante

SC414

6A Integrated FET Regulator with 5V LDO

Semtech Corporation 

SC414/SC424

Pin Descriptions

Pin #

1

2

3, 26, PAD 1

Pin Name Pin Function

Feedback input for switching regulator used to program the output voltage — connect to an external resis-

FB

tor divider from VOUT to AGND.

Bias input for internal analog circuits and gate drives — connect to external 3V or 5V supply or bias connec-

V5V

tion to VLDO.

AGND

Analog ground

4

5, 8-11

PAD 2

6

7

12

15,20, 21,

PAD 3

13, 14, 16-19

22

23

VOUT

Switcher output voltage sense pin, and also the input to the internal switch-over between VOUT and VLDO.

VIN

Input supply voltage

VLDO

BST

LXBST

5V LDO output

Bootstrap pin — connect a capacitor from BST to LXBST to develop the floating supply for the high-side gate

drive.

LX Boost — connect to the BST capacitor.

LX

Switching (phase) node

PGND

PGOOD

ILIM

Power ground

Open-drain power good indicator — high impedance indicates power is good. An external pull-up

resistor is required.

Current limit sense pin — used to program the current limit by connecting a resistor from ILIM to LXS.

24

LXS

LX sense — connects to RILIM resistor

Enable/power save input for the switching regulator — connect to AGND to disable the switching regula-

tor. Float to operate in forced continuous mode (power save disabled). For SC414, connect to V5V to operate

25

EN/PSV

with ultrasonic power save mode enabled. For SC424, connect to V5V to operate with power save mode

enabled with no minimum frequency.

27

TON

On-time programming input — set the on-time by connecting through a resistor to AGND

Enable input for the LDO — connect ENL to AGND to disable the LDO. Drive with logic to +3V for logic con-

28

ENL

trol, or program the VIN UVLO with a resistor divider between VIN, ENL, and AGND.

12

Share Link: