ST TSC103 User Manual

High-voltage, high-side current sense amplifier

Features

■ Independent supply and input common-mode

voltages

■ Wide common-mode operating range:

2.9 to 70 V in single-supply configuration

-2.1 to 65 V in dual-supply configuration

■ Wide common-mode surviving range:

-16 to 75 V (reversed battery and load-dump
conditions)

■ Supply voltage range:

2.7 to 5.5 V in single-supply configuration

■ Low current consumption: I

■ Pin selectable gain: 20 V/V, 25 V/V, 50 V/V or

max = 360 µA

CC

100 V/V

■ Buffered output

,

TSC103

TSSOP8

(Plastic package)

SO-8

(Plastic package)

Applications

■ Automotive current monitoring

■ DC motor control

■ Photovoltaic systems

■ Battery chargers

■ Precision current sources

■ Current monitoring of notebook computers

■ Uninterruptible power supplies

■ High-end power supplies

Description

The TSC103 measures a small differential voltage
on a high-side shunt resistor and translates it into
a ground-referenced output voltage. The gain is
adjustable to four different values from 20 V/V up
to 100 V/V by two selection pins.

Wide input common-mode voltage range, low
quiescent current, and tiny TSSOP8 packaging
enable use in a wide variety of applications.

Vm

SEL1

SEL2

Ou

1

2

3

t

4

Vp

8

Vcc-

7

Gnd

6

Vcc+

5

Pin connections

(top view)

The input common-mode and power-supply
voltages are independent. The common-mode
voltage can range from 2.9 to 70 V in the single­supply configuration or be offset by an adjustable
voltage supplied on the Vcc- pin in the dual­supply configuration.

With a current consumption lower than 360 µA
and a virtually null input leakage current in
standby mode, the power consumption in the
applications is minimized.

November 2011 Doc ID 16873 Rev 2 1/26

www.st.com

26

Contents TSC103

Contents

1 Application schematic and pin description . . . . . . . . . . . . . . . . . . . . . . 3

2 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 6

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Electrical characteristics curves: current sense amplifier . . . . . . . . . 10

5 Parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1 Common mode rejection ratio (CMR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2 Supply voltage rejection ratio (SVR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.3 Gain (Av) and input offset voltage (V

) . . . . . . . . . . . . . . . . . . . . . . . . . . 13

os

5.4 Output voltage drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.5 Input offset drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.6 Output voltage accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6 Maximum permissible voltages on pins . . . . . . . . . . . . . . . . . . . . . . . . 18

7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

8.1 SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

8.2 TSSOP-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2/26 Doc ID 16873 Rev 2

TSC103 Application schematic and pin description

1 Application schematic and pin description

The TSC103 high-side current sense amplifier can be used in either single- or dual-supply
mode. In the single-supply configuration, the TSC103 features a wide 2.9 V to 70 V input
common-mode range totally independent of the supply voltage. In the dual-supply range,
the common-mode range is shifted by the value of the negative voltage applied on the Vcc­pin. For instance, with Vcc+ = 5 V and Vcc- = -5 V, then the input common-mode range is

-2.1 V to 65 V.

Figure 1. Single-supply configuration schematic

Vsense

Iload

Rsense

Rsense

Vp Vm

Vp Vm

Rg1

Rg1

Rg2

Rg2

Iload

Sense

amplifier

Common-mode voltage: 2.9 V to 70 V

load

load

Vcc+

Vcc+

Voltage

buffer

SEL1

SEL2

Vcc

Vcc

GPIO1

GPIO2

5 V

Vout

ADC

Gnd

TSC103

Vcc-

Rg3

Gnd

K2

Out

µ Controller

AM04517

Doc ID 16873 Rev 2 3/26

Application schematic and pin description TSC103

Figure 2. Dual-supply configuration schematic

Vsense

Iload

Rsense

Common-mode voltage: -2.1 V to 65 V

load

5 V

Vp Vm Vcc+

Out

SEL1

TSC103

Vcc-

SEL2

Gnd

Vout

GPIO1

GPIO2

Vcc

ADC

µController

Gnd

-5 V

AM04518

4/26 Doc ID 16873 Rev 2

TSC103 Application schematic and pin description

Figure 3. Common-mode versus supply voltage in dual-supply configuration

Vicm

common-mode voltage

operating range

Max = 70 V

min = 2.9 V

V

= 0 V V

cc-

Max = 65 V

min = -2.1 V

= -5 V

cc-

Max = 60 V

min = -7.1 V

V

= -10 V

cc-

Single-supply Dual-supply

AM04519

Ta bl e 1 describes the function of each pin. Their position is shown in the illustration on the

cover page and in Figure 1 on page 3.

Table 1. Pin description

Symbol Type Function

Out Analog output

Gnd Power supply Ground line.

Vcc+ Power supply Positive power supply line.

Vcc- Power supply Negative power supply line.

Vp Analog input

Vm Analog input

SEL1 Digital input Gain-select pin.

SEL2 Digital input Gain-select pin.

The Out voltage is proportional to the magnitude of the sense
voltage V

p-Vm

.

Connection for the external sense resistor. The measured current
enters the shunt on the V

side.

p

Connection for the external sense resistor. The measured current
exits the shunt on the V

side.

m

Doc ID 16873 Rev 2 5/26

Absolute maximum ratings and operating conditions TSC103

2 Absolute maximum ratings and operating conditions

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V

V

in_sense

V

in_sel

V

cc+

V

cc+-Vcc-

V

out

T

stg

T

id

Input pins differential voltage (Vp-Vm)±20V

Sensing pins input voltages (Vp, Vm)

Gain selection pins input voltages (SEL1, SEL2)

Positive supply voltage

(2)

(1)

(2)

-16 to 75 V

-0.3 to V

+0.3 V

cc+

-0.3 to 7 V

DC supply voltage 0 to 15 V

DC output pin voltage

(2)

-0.3 to V

+0.3 V

cc+

Storage temperature -55 to 150 °C

Maximum junction temperature 150 °C

j

TSSOP8 thermal resistance junction to ambient 120 °C/W

R

thja

ESD

1. These voltage values are measured with respect to the V

2. These voltage values are measured with respect to the Gnd pin.

3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a

1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.

4. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between

two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.

5. Charged device model: all pins plus package are charged together to the specified voltage and then
discharged directly to ground.

Table 3. Operating conditions

SO-8 thermal resistance junction to ambient 125 °C/W

(4)

(3)

(5)

cc-

2.5 kV

150 V

1.5 kV

pin.

HBM: human body model

MM: machine model

CDM: charged device model

Symbol Parameter Value Unit

Supply voltage in single-supply configuration from

V

cc+

T

to T

min

(V

max

connected to Gnd = 0 V)

cc-

Negative supply voltage in dual-supply
configuration from T

V

cc-

V

T

icm

oper

V

= 5.5 V max -8 to 0 V

cc+

V

= 3 V max -11 to 0 V

cc+

Common-mode voltage range referred to pin Vcc ­(T

min

to T

max

)

Operational temperature range (T

min

to T

6/26 Doc ID 16873 Rev 2

max

min

to T

2.7 to 5.5 V

2.9 to 70 V

) -40 to 125 °C

max

TSC103 Electrical characteristics

3 Electrical characteristics

The electrical characteristics given in the following tables are measured under the following
test conditions unless otherwise specified.

● T

● V

Table 4. Supply

Symbol Parameter Test conditions Min. Typ. Max. Unit

=25°C, V

amb

sense=Vp-Vm

cc+

=5V, V

connected to Gnd (single-supply configuration).

cc-

=50mV, Vm= 12 V, no load on Out, all gain configurations.

I

CC

I

CC1

Table 5. Input

Total supply current V

Total supply current

= 0 V, T

sense

= 50 mV Av = 50 V/V

V

sense

< T

T

min

Symbol Parameter Test conditions Min. Typ. Max. Unit

DC common-mode rejection

DC CMR

Variation of V

out

referred to input

versus V

(1)

icm

AC common-mode rejection

AC CMR

Variation of V

versus V

out

referred to input (peak-to-peak

icm

voltage variation)

Supply voltage rejection

SVR

Variation of V

versus V

out

CC

(2)

SEL1 = Gnd, SEL2 = Gnd

V

Input offset voltage

os

(3)

dVos/dT Input offset drift vs. T

Input leakage current

I

lk

I

Input bias current

ib

V

V

I

1. See Chapter 5: Parameter definitions on page 13 for the definition of CMR.

2. See Chapter 5 for the definition of SVR.

3. See Chapter 5 for the definition of V

Logic low voltage threshold (SEL1

IL

and SEL2)

Logic high voltage threshold (SEL1

IH

and SEL2)

Gain-select pins (SEL1 and SEL2)

sel

input bias current

.

os

2.9 V< Vm < 70 V
< T

T

min

Av=50V/V or 100V/V

2.9 V< V

1kHz sine wave

2.7 V< V

V

=30mV

sense

< T

T

min

T

=25°C

amb

T

< T

min

Av = 50 V/V

< T

T

min

V

=0V

CC

< T

T

min

V

=0V

sense

< T

T

min

V

min

CC

T

< T

min

V

min

CC

T

< T

min

SEL pin connected to GND or

V

T

min

CC

min

< T

amb

max

< T

amb

max

< 30 V

m

< 5.5 V

CC

< T

amb

max

< T

amb

max

< T

amb

max

< T

amb

max

< T

amb

max

< VCC < V

< T

amb

max

< VCC < V

< T

amb

max

< T

< T

amb

< T

CC

CC

amb

max

max

max

< T

max

200 360 µA

300 480 µA

90 105 dB

95 dB

85 95 dB

-20 +5 µV/°C

10 15 µA

-0.3 0.5 V

1.2 V

400 nA

±500

±1100

µV

1µA

CC

V

Doc ID 16873 Rev 2 7/26

Electrical characteristics TSC103

Table 6. Output

Symbol Parameter Test conditions Min. Typ. Max. Unit

Av Gain

/ΔT Output voltage drift vs. T

ΔV

out

ΔV

/ΔI

out

Output stage load regulation

out

(1)

SEL1 = Gnd, SEL2 = Gnd
SEL1 = Gnd, SEL2 = Vcc+
SEL1 = Vcc+, SEL2 = Gnd
SEL1 = Vcc+, SEL2 = Vcc+

Av = 50 V/V
T

< T

amb

< T

out

max

<10 mA

min

-10 mA < I
I

sink or source current

out

20
25
50

100

±240 ppm/°C

0.3 ±1.5 mV/mA

Av = 50 V/V

amb

amb

amb

amb

amb

< T

< T

< T

< T

< T

(3)

max

(3)

max

max

max

amb

max

amb

amb

=25° C

=25° C

=25° C

or

CC

±2.5

±4

±3.5

±5

±3.5

±5

±5.5

±8

±10
±22

15 26 mA

ΔV

ΔV

ΔV

ΔV

ΔV

V

=50mV

Total output voltage accuracy

out

Total output voltage accuracy

out

Total output voltage accuracy

out

Total output voltage accuracy

out

Total output voltage accuracy

out

I

sc

Short-circuit current

(2)

sense

T

=25°C

amb

T

< T

min

V

=90mV

sense

T

=25°C

amb

< T

T

min

=20mV T

V

sense

T

< T

min

V

=10mV T

sense

T

< T

min

=5mV T

V

sense

< T

T

min

OUT connected to V
GND

V/V

%

%

%

%

%

Output stage high-state saturation

V

OH

V

1. See Chapter 5: Parameter definitions on page 13 for the definition of output voltage drift versus temperature.

2. Output voltage accuracy is the difference with the expected theoretical output voltage V
more detailed definition.

3.

Except for Av = 100 V/V.

voltage
VOH=VCC-V

Output stage low-state saturation

OL

voltage

out

V

sense

I

out

V

sense

I

out

=1V

=1mA

=-1 V

=1mA

out-th

=Av*V

85 135 mV

80 125 mV

. See Chapter 5 for a

sense

8/26 Doc ID 16873 Rev 2