February 2007

Rev 1

1/15

15

TSM1052

Constant voltage and constant current controller

for battery chargers and adapters

Features

current control

Applications

Description

The TSM1052 is a highly integrated solution for

SMPS applications requiring a dual control loop to

perform CV (constant voltage) and CC (constant

current) regulation.

The TSM1052 integrates a voltage reference, two

Op-Amps (with OR-ed open-drain outputs), and a

low-side current sensing circuit.

The voltage reference, along with one Op-Amp, is

the core of the voltage control loop; the current

sensing circuit and the other Op-Amp make up

the current control loop.

The external components needed to complete the

two control loops are:

power supply (adapter, battery charger) and

fixes the voltage regulation set point at the

specified value;

circuit with a voltage proportional to the dc

output current; this resistor determines the

current regulation set point and must be

adequately rated in terms of power dissipation;

(R-C networks) for both loops.

The TSM1052, housed in one of the smallest

package available, is ideal for space-shrunk

applications such as adapters and chargers.

SOT23-6L

www.st.com

Table 1.

Device summary

Part number

Package

Packaging

TSM1052

SOT23-6L

Tape and reel