Control Logic

Soft Start

Thermal

Shutdown

UVLO

Gate

Drive

GND

FB

EN

SW

Modulator

GND

Zero Current Detect

Peak Current Detect

+

_

+

±

GND

VIN

PG

Power Good feature is only available in TLV62569P

Copyright Ú 2016, Texas Instruments Incorporated

6

TLV62569, TLV62569P

SLVSDG1C – DECEMBER 2016 – REVISED OCTOBER 2017

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Product Folder Links: TLV62569 TLV62569P

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Copyright © 2016–2017, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The TLV62569 is a high-efficiency synchronous step-down converter. The device operates with an adaptive off

time with peak current control scheme. The device operates at typically 1.5-MHz frequency pulse width

required off time for the low-side MOSFET. It makes the switching frequency relatively constant regardless of the

variation of input voltage, output voltage, and load current.

7.2 Functional Block Diagrams

Figure 4. TLV62569 Functional Block Diagram

7.3 Feature Description

7.3.1 Power Save Mode

The device automatically enters Power Save Mode to improve efficiency at light load when the inductor current

becomes discontinuous. In Power Save Mode, the converter reduces switching frequency and minimizes current

consumption. In Power Save Mode, the output voltage rises slightly above the nominal output voltage. This effect

is minimized by increasing the output capacitor.

7.3.2 100% Duty Cycle Low Dropout Operation

The device offers a low input-to-output voltage differential by entering 100% duty cycle mode. In this mode, the

high-side MOSFET switch is constantly turned on and the low-side MOSFET is switched off. The minimum input

voltage to maintain output regulation, depending on the load current and output voltage, is calculated as:

where

•

•

(1)