SC427MLTRT【PDF 14/33 页】IC REG DL BUCK/LINEAR 32MLPQ

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Sheet目录46

10页 11页 12页 13页 [14页]15页 16页 17页 18页

SC417/SC427

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.

FBL

Feedback input for the LDO connect to an external resistor divider from VLDO to AGND used to pro-

gram the LDO output.

V5V

5V power input for internal analog circuits and gate drives connect to external 5V supply or configure

the LDO for 5V and connect to VLDO.

4, 30, PAD 1 AGND Analog ground

VOUT

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

The voltage at this pin must be less than or equal to the voltage at the V5V pin.

6, 9-11,

PAD 2

VIN Input supply voltage

VLDO LDO output The voltage at this pin must be less than or equal to the voltage at the V5V pin.

BST

Bootstrap pin connect a capacitor of at least 100nF from BST to LX to develop the floating supply for the

high-side gate drive.

DH High-side gate drive do not connect this pin

LXBST LX Boost connect to the BST capacitor.

23-25, PAD 3

LX Switching (phase) node

DL Low-side gate drive do not connect this pin

15-22

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 LX.

LXS LX sense connects to R

ILIM

EN/PSV

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

Float to operate in forced continuous mode (power-save disabled). SC417 connect to V5V to operate with

ultra-sonic power-save mode enabled. SC427 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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