ST TSM1012 User Manual

1

TSM1012

LOW CONSUMPTION VOLTAGE AND CURRE NT

CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS

■ CONSTANT VOLTAGE AND CONSTANT

CURRENT CONTROL

■ LOW CONSUMPTION

■ LOW VOLTAGE OPERATION

■ LOW EXTERNAL COMPONENT COUNT

■ CURRENT SINK OUTPUT STAGE

■ EASY COMPENSATION

■ HIGH AC MAINS VOLTAGE REJECTION

VOLTAGE REFERENCE

■ FIXED OUTPUT VOLTAGE REFERENCE

1.25V

■ 0.5% AND 1% VOLTAGE PRECISION

DESCRIPTION

TSM1012 is a highly integrated solution for SMPS
applications requiring CV (constant voltage) and
CC (constant current) mode.
TSM1012 integrates one voltage reference and
two operational amplifiers (with ORed outputs ­common collect or s).
The voltage reference combined with one
operational amplifier makes it an ideal voltage
controller. The other operational, combined with
few external resistors and the voltage reference,
can be used as a current limiter.

APPLICATIONS

■ ADAPTERS

■ BATTERY CHARGERS

ORDER CODE

Part

Number

TSM1012I -40 to 105°C • 1 M1012
TSM1012AI -40 to 105°C • 0.5 M1012A
TSM1012I -40 to 105°C • 1M804
TSM1012AI -40 to 105°C • 0.5 M805

D = Small Outline Package (SO) - also available in Tape & Reel (DT
S = Small Outline Package (MiniSO8) - also availabl e in Tape & Reel (ST)

Temperature

Range

Package Vref

Marking

SD%

D

SO-8

(Plastic Package)

(Plastic Micropackage)

S

MiniSO-8

PIN CONNECTIONS (top view)

Vref Vcc

1

28V

,25V

CC-

2

CC+ Gnd

3

CV- CV+

45

CC

CV

Out

8

7

6

February 2004

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TSM1012

PIN DESCRIPTION
SO8 & MiniSO8 Pin out

Name Pin # Type Function

Vref 1 Analog Output Voltage Reference
CC- 2 Analog Input Input pin of the operational amplifier

CC+ 3 Analog Input Input pin of the operational amplifier

CV- 4 Analog Input Input pin of the operational amplifier
CV+ 5 Analog Input Input pin of the operational amplifier
Gnd 6 Power Supply Ground Line. 0V Reference For All Voltages

Out 7 Analo g Ou tpu t Output of the two opera tio na l amp lifie r

Vcc 8 Power Supply Power supply line.

ABSOLUTE MAXIMUM RATINGS

Symbol DC Supply Voltage Value Unit

Vcc DC Supply Voltage (50mA =< Icc) -0.3V to Vz V

Vi Input Voltage -0.3 to Vcc V

Tstg Storage temperature -55 to 150 °C

Tj Junction temperature 150 °C

Iref Voltage reference output current 2.5 mA

ESD Electrostatic Discharge 2 kV
Rthja Thermal Resistance Junction to Ambient Mini SO8 package 180 °C/W
Rthja Thermal Resistance Junction to Ambient SO8 package 175 °C/W

OPERATING CONDITIONS

Symbol Parameter Value Unit

Vcc DC Supply Conditions 4.5 to Vz V

Toper Operational temperature -40 to 105 °C

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TSM1012

ELECTRICAL CHARACTERISTICS
Tamb = 25°C and Vcc = +18V (unless otherwise specified)

Symbol Parameter Test Condition Min Typ Max Unit

Total Current Consumpt ion

Icc Total Supply Current, excluding current

in Voltage Reference

1)

.

Vcc = 18V, no load
Tmin. < Tamb < Tmax.

Vz Vcc clamp voltage Icc = 50mA 28 V

Operators

Input Offset Voltage

V

io

TSM1012
TSM1012A

DV

Input Offset Voltage Drift 7 µV/°C

io

Input Offset Current T

I

io

I

Input Bias Current T

ib

SVR Supply Voltage Rejection Ration V

= 25°C

T

amb

≤ T

T

min.

T

amb

T

min.

amb

T

min.
amb

T

min.
CC

≤ T

amb

max.

= 25°C
≤ T

≤ T

amb

max.

= 25°C
≤ T

≤ T

amb

max.

= 25°C
≤ T

≤ T

amb

max.

= 4.5V to 28V 65 100 dB

Vicm Input Common Mode Voltage Range 0 Vcc-1.5 V

CMR Common Mode Rejection Ratio T

T

amb
min.

= 25°C
≤ T

amb

≤ T

max.

70
60

Output stage

Gm Transconduction Gain. Sink Current

Only

2)

Vol Low outp ut vo ltage at 5 mA sin kin g

current

Ios Output Short Circuit Current. Output to

(Vcc-0.6V). Sink Current Only

T
T

T
T

T

amb
min.

min.

amb
min.

= 25°C
≤ T

amb

≤ T

amb

= 25°C
≤ T

amb

≤ T
≤ T

≤ T

max.
max.

max.

0.5

6
5

Voltage reference

V

Reference Input Voltage

∆V

ref

TSM1012 1% precision
TSM1012A 0.5% precision

Reference Input Voltage Deviation Over

ref

T
T
T
T

T

amb
min.
amb
min.

min.

= 25°C
≤ T

amb

= 25°C
≤ T

amb

≤ T

amb

≤ T

≤ T
≤ T

max.

max.
max.

1.238

1.225

1.244

1.237

Temperature Range

RegLine Reference input voltage deviation over

Iload = 1mA 20 mV

Vcc range.

RegLoad Reference input voltage deviation over

output current.

1. Test conditions: pin 2 and 6 connected to GND, pin 4 and 5 connected to 1. 25V, pin 3 connected to 200mV.

2. The current depends on the difference voltage between the negative and the positive inputs of the amplifier. If the voltage on the minus
input is 1mV higher than the positive amplifier, the sinking current at the outpu t OUT will be incr eased by Gm*1mA.

Vcc = 18V,
0 < Iload < 2.5mA

100 180 µA

1

4

mV

5

0.5

2
3

23050nA

20
50

150
200

nA

85 dB

1

mA/mV

1

250 400 mV

10 mA

1.25

1.262

1.273

1.25

1.256

1.261

20 30 mV

10 mV

V

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