SC424MLTRT【PDF 12/29 页】IC REG DL BUCK/LINEAR 28MLPQ

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Sheet目录46

8页 9页 10页 11页 [12页]13页 14页 15页 16页

SC414/SC424

Pin Descriptions

Pin # Pin Name Pin Function

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

tor divider from VOUT to AGND.

V5V

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

tion to VLDO.

3, 26, PAD 1 AGND Analog ground

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

5, 8-11

PAD 2

VIN Input supply voltage

VLDO 5V LDO output

BST

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

drive.

LXBST LX Boost connect to the BST capacitor.

15,20, 21,

PAD 3

LX Switching (phase) node

13, 14, 16-19 PGND Power ground

PGOOD

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

resistor is required.

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

LXS LX sense connects to RILIM resistor

EN/PSV

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

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

enabled with no minimum frequency.

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

ENL

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

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

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