I

peak(typ)

I

LIM

V

IN

L

100 ns

I

peak(typ)

400 mA

V

IN

L

100 ns for the TPS61040-Q1

I

peak(typ)

250 mA

V

IN

L

100 ns for the TPS61041-Q1

=

=

=

+

+

+

×

×

×

+

+

-

RS Latch

Logic

S

R

Gate

Driver

_

Current Limit

Power MOSFET

N-Channel

Soft

Start

6

µs Max

On Time

Error Comparator

400 ns Min

Off Time

Under Voltage

Lockout

Bias Supply

VIN

FB

EN

GND

SW

9

TPS61040-Q1, TPS61041-Q1

www.ti.com

SGLS276D – JANUARY 2005 – REVISED MARCH 2016

Product Folder Links: TPS61040-Q1 TPS61041-Q1

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Copyright © 2005–2016, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The TPS6104x-Q1 is a high-frequency boost converter dedicated for small-to-medium LCD bias supply and

white-LED backlight supplies. The device is ideal for generating output voltages up to 28 V from a dual-cell

NiMH/NiCd or a single-cell device Li-Ion battery.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Peak Current Control

(TPS61040-Q1) or 250 mA (TPS61041-Q1). Due to the internal propagation delay of typical 100 ns, the actual

current exceeds the DC-current limit threshold by a small amount. The typical peak current limit can be

calculated:

where

•

•

L= Selected inductor value

•

(1)

The higher the input voltage and the lower the inductor value, the greater the peak.