TPSM828213SILR datasheet(8/44 Pages) TI

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8 Detailed Description

8.1 Overview

The TPSM8282x synchronous step-down converter power module is based on DCS-Control™ (Direct Control

with Seamless transition into Power-Save Mode). This is an advanced regulation topology that combines the

advantages of hysteretic, voltage, and current mode control.

The DCS-Control™ topology operates in PWM (Pulse Width Modulation) mode for medium to heavy load

conditions and in PSM (Power-Save Mode) at light load currents. In PWM, the converter operates with its

nominal switching frequency of 4 MHz having a controlled frequency variation over the input voltage range.

As the load current decreases, the converter enters Power-Save Mode, reducing the switching frequency

and minimizing the quiescent current of the IC to achieve high efficiency over the entire load current range.

DCS-Control™ supports both operation modes using a single building block and, therefore, has a seamless

transition from PWM to PSM without effects on the output voltage. The TPSM8282x offers excellent DC voltage

regulation and load transient regulation, combined with low output voltage ripple, minimizing interference with RF

circuits.

8.2 Functional Block Diagram

VOUT

GND

Output Discharge

Logic

Direct Control

and

Compensation

Timer

ton

Comparator

Ramp

Error Amplifier

DCS - Control

MOSFET Driver

Control Logic

High Side

Current Sense

Hiccup

Counter

VIN

Bandgap

Undervoltage Lockout

Thermal Shutdown

REF

(1)

Fixed VOUT

VPGTH(high)

VFB

VPGTH(low)

deglitch

(1) Inductance value is 0.47 µH in TPSM82821, 0.24 µH in TPSM82822 and 0.24 µH in TPSM82823.

8.3 Feature Description

8.3.1 PWM and PSM Operation

The TPSM8282x includes a fixed on-time (tON) circuitry. This tON, in steady-state operation in PWM and PSM

modes, is estimated as:

OUT

250ns

(1)

In PWM mode, the TPSM8282x operates with pulse width modulation in continuous conduction mode (CCM)

with a tON shown in Equation 1 at medium and heavy load currents. A PWM switching frequency of typically 4

MHz is achieved by this tON circuitry.

TPSM82823, TPSM82822, TPSM82821

SLVSEP0E – APRIL 2018 – REVISED MAY 2021

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