Thermal

Shutdown

Current Sense

and IOUT

Monitor

UVLO

Gate Driver

Pulse Modulator

Soft Start

Control

OVP & Short

Circuit Protection

6

4

9

2

3

Logic

7

8

VOUT

REF

VIN

VOUT

VIN

SW

INACT

EN

FB

CC

VOUT

VIN

1

5

PGND

AGND

1)

TPS61236P

TPS61235P

Bootstrap

Copyright © 2016, Texas Instruments Incorporated

9

TPS61235P, TPS61236P

www.ti.com

SLVSCK4A – SEPTEMBER 2015 – REVISED MAY 2016

Product Folder Links: TPS61235P TPS61236P

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Copyright © 2015–2016, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The TPS6123x is a high current, high efficiency synchronous boost converter with constant current output

feature. It is optimized for single cell Li-Ion and Li-polymer battery powered products, in a wide range of power

bank, tablet, and other portable devices. The converter integrates 14-mΩ /14-mΩ power switches and is capable

switches enables up to 97% power conversion efficiency.

The TPS6123x has two regulation loops, one is the output voltage regulation loop as the normal boost converters

have, and the other is the output current regulation loop. An external resistor can be used to program the

maximum output current, and once the output current reaches the programmed value, the current loop kicks in to

regulate the output current. The TPS6123x can also indicate the load status. These features can simplify system

design, eliminate external power path components like a load switch, and achieve much lower system thermal

dissipation and improve the total power conversion effectively.

The TPS6123x also consumes only 10-µA quiescent current under a light load condition. This low quiescent

current together with the load status indication function makes the device very suitable for Always-On

applications. For example, for a power bank application, the TPS6123x can remain always on and report load

status to the system controller.

8.2 Functional Block Diagram

(1)

Internal FB resistor divider is implemented in TPS61235P only.