PIFE32251B-R47MS datasheet(36/96 Pages) TI1

36 / 96 page

Bandgap

Min. ON Time

Min. OFF Time

Gate Driver

Anti

Shoot-Through

Current

Limit Comparator

LXx

Limit

High Side

Limit

Low Side

FBx

MODE

PVINx

PGND/Thermal Pad

VIN

Integrated

Feed Back

Network

VREF

Error

Comparator

Zero/Negative

Current Limit Comparator

Control

Logic

NMOS

MODE / EN

VREF

0.40 V

Softstart

PMIC Internal Signals

External Inputs/Outputs

TPS65094

SWCS133C – SEPTEMBER 2015 – REVISED FEBRUARY 2019

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Detailed Description

6.3.3.2

Converter Overview

The PMIC synchronous step-down DC-DC converters include a unique hysteretic PWM control scheme

which enables a high switching frequency converter, excellent transient and AC load regulation, as well as

operation with cost-competitive external components. The controller topology supports forced PWM mode

as well as power-save mode operation. Power-save mode operation, or PFM mode, reduces the quiescent

current consumption and ensures high conversion efficiency at light loads by skipping switch pulses. In

forced PWM mode, the device operates on a quasi-fixed frequency, avoids pulse skipping, and allows

filtering of the switch noise by external filter components. The PMIC device offers fixed output voltage

options featuring smallest solution size by using only three external components per converter.

A significant advantage of PMIC compared to other hysteretic PWM controller topologies is the excellent

capability of the AC load transient regulation. When the output voltage falls below the threshold of the

error comparator, a switch pulse is initiated, and the high-side switch is turned on. The high-side switch

remains turned on until a minimum ON-time of tONmin expires and the output voltage trips the threshold of

the error comparator or the inductor current reaches the high-side switch current limit. When the high-side

switch turns off, the low-side switch rectifier is turned on and the inductor current ramps down until the

high-side switch turns on again or the inductor current reaches zero. In forced PWM mode operation,

negative inductor current is allowed to enable continuous conduction mode even at no load condition.

Figure 6-4. Converter Block Diagram

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