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TSM1052 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. TSM1052
Description  Constant voltage and constant current controller for battery chargers and adapters
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com

TSM1052 Datasheet(HTML) 1 Page - STMicroelectronics

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February 2007
Rev 1
Constant voltage and constant current controller
for battery chargers and adapters
Secondary-side constant voltage and constant
current control
Very low voltage operation
Very low quiescent consumption
High-accuracy internal reference
Low external component count
Wired-or open-drain output stage
Easy frequency compensation
SOT23-6L micro package
Battery chargers
AC-DC adapters
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:
A resistor divider that senses the output of the
power supply (adapter, battery charger) and
fixes the voltage regulation set point at the
specified value;
A sense resistor that feeds the current sensing
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;
Frequency compensation components
(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.
Table 1.
Device summary
Part number
Tape and reel

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