OUT

IN

V

D

V



Power Control

Control Logic

Gate Drive

Direct Control

&

Compensation

Power

Good

Control

UVLO

Soft Start

+

-

+

-

+

-

EN

FB

VIN

SW

ILIM

PGND

PG

AGND

VOUTS

Current Limit

Control

Average

Threshold

Low Side

Current

Limit

Threshold

Average Input

Current Detector

Average

Threshold

LMR22007

SNVS985A – OCTOBER 2013 – REVISED OCTOBER 2013

www.ti.com

FUNCTIONAL BLOCK DIAGRAM

Theory of Operation

The LMR22007 is a buck regulator IC that delivers a 750 mA load current. The regulator has a preset switching

frequency of 2.1 MHz. This high frequency allows the LMR22007 to operate with small surface mount capacitors

and inductors, resulting in a DC-DC converter that requires a minimum amount of board space. The LMR22007

is internally compensated, which reduces design time, and requires few external components.

The following operating description of the LMR22007 will refer to the Block Diagram and to the waveforms in the

Figure below. The LMR22007 supplies a regulated output voltage by turning on the internal NMOS switch and

below ground by the voltage drop across the low side device. The regulator loop adjusts the duty cycle (D) to

maintain a constant output voltage.

10

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