Datasheet

LMR24210

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SNVS738G –OCTOBER 2011–REVISED APRIL 2013

PIN DESCRIPTIONS

Ball Name Description Application Information

A2, A3, B2, B3, SW Switching Node Internally connected to the source of the main MOSFET

C2, C3, D2, D3, and the drain of the Synchronous MOSFET. Connect to

D4 the inductor.

A4, B4 VIN Input supply voltage Supply pin to the device. Nominal input range is 4.5V to

42V.

C4 BST Connection for bootstrap capacitor Connect a 33 nF capacitor from the SW pin to this pin. An

internal diode charges the capacitor during the main

MOSFET off-time.

E3, E4, F1, F2, AGND Analog Ground Ground for all internal circuitry other than the PGND pin.

F3, G3

G2 SS Soft-start An 8 µA internal current source charges an external

capacitor to provide the soft- start function.

G1 FB Feedback Internally connected to the regulation and over-voltage

comparators. The regulation setting is 0.8V at this pin.

Connect to feedback resistors.

G4 EN Enable Connect a voltage higher than 1.26V to enable the

regulator. Leaving this input open circuit will enable the

device at internal UVLO level.

F4 RON On-time Control An external resistor from the VIN pin to this pin sets the

main MOSFET on-time.

E1, E2 VCC Start-up regulator Output Nominally regulated to 6V. Connect a capacitor of not less

than 680 nF between the VCC and AGND pins for stable

operation.

A1, B1, C1, D1 PGND Power Ground Synchronous MOSFET source connection. Tie to a ground

plane.

Product Folder Links: LMR24210