I

L

t

200mA

(typ.)

ContinuousCurrentOperation

DiscontinuousCurrentOperation

200mA

(typ.)

Current

Sensor

Gate

Driver

Device

Control

GND

EN

FB

VOUT

SW

VREF

VBAT

Device

Control

Start Up

VIN

VOUT

TLV61220

SLVSB53A – MAY 2012 – REVISED DECEMBER 2014

www.ti.com

10 Detailed Description

10.1 Overview

The TLV61220 is a high performance, highly efficient boost converter. To achieve high efficiency the power stage

MOSFETs are implemented.

10.2 Functional Block Diagram

10.3 Feature Description

10.3.1

Controller Circuit

The device is controlled by a hysteretic current mode controller. This controller regulates the output voltage by

keeping the inductor ripple current constant in the range of 200 mA and adjusting the offset of this inductor

current depending on the output load. In case the required average input current is lower than the average

inductor current defined by this constant ripple the inductor current gets discontinuous to keep the efficiency high

at low load conditions.

Figure 13. Hysteretic Current Operation

To regulate the output voltage, the voltage error amplifier compares this feedback voltage to the internal voltage

reference and adjusts the required offset of the inductor current accordingly. An external resistor divider needs to

be connected.

The self oscillating hysteretic current mode architecture is inherently stable and allows fast response to load

variations. It also allows using inductors and capacitors over a wide value range.

10

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