ST TSC1031 User Manual

High-voltage, high-side current sense amplifier

t

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: 50 V/V or 100 V/V

■ Buffered output

■ EMI filtering

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 TSC1031 measures a small differential
voltage on a high-side shunt resistor and
translates it into a ground-referenced output
voltage. The TSC1031’s dedicated schematic
eases the implementation of EMI filtering in harsh
environments. The gain is adjustable to 50 V/V or
100 V/V by a selection pin.

max = 360 µA

CC

TSC1031

TSSOP8

(Plastic package)

SO-8

(Plastic package)

Vm

1

A1

2

SEL

3

Ou

4

Pin connections

(top view)

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

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.

Vp

8

Vcc-

7

Gnd

6

Vcc+

5

April 2011 Doc ID 16875 Rev 2 1/26

www.st.com

26

Contents TSC1031

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

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

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

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

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

os

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 16875 Rev 2

TSC1031 Application schematic and pin description

1 Application schematic and pin description

The TSC1031 high-side current sense amplifier can be used in either single- or dual-supply
mode. In the single-supply configuration, the TSC1031 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

Common-mode voltage: 2.9 V to 70 V

Rf1

Cf

Vp Vm

Rg1

TSC1031

Rf2

Rg2

Cf

Sense

amplifier

Rg3

A1

Rf3

Vcc

Vol tage

buffer

K2

SEL

Out

5 V

Vcc

GPIO

ADC

GndGndVcc-

µController

AM04523

Doc ID 16875 Rev 2 3/26

Application schematic and pin description TSC1031

Figure 2. Dual-supply configuration schematic

Vsense

Rf1

Cf

Rf2

Iload

Cf

Common-mode voltage: -2.1 V to 65 V

5 V

Vp Vm

Rg1

Rg2

TSC1031

Sense

amplifier

Rg3

A1

Rf3

Vcc

Vol tage

buffer

K2

GndVcc-

SEL

Out

Vcc

GPIO

ADC

Gnd

µController

-5 V

AM04524

4/26 Doc ID 16875 Rev 2

TSC1031 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

SEL Digital input Gain-select pin.

A1 Analog output Connection to the output resistor.

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 16875 Rev 2 5/26

Absolute maximum ratings and operating conditions TSC1031

2 Absolute maximum ratings and operating conditions

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V

V

in_sense

V

in_sel

V

in_A1

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 pin input voltage (SEL)

A1 pin input voltage

Positive supply voltage

(2)

(2)

(1)

(2)

-16 to 75 V

-0.3 to V

-0.3 to V

+0.3 V

cc+

+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

HBM: human body model

MM: machine model

(3)

(4)

CDM: charged device model

(5)

cc-

pin.

2.5 kV

150 V

1.5 kV

Symbol Parameter Value Unit

DC supply voltage in single-supply configuration

V

cc+

from T
(V

to T

min

connected to Gnd = 0 V)

cc-

max

Negative supply voltage in dual-supply

V

V

T

cc-

icm

oper

configuration from T

V

= 5.5 V max -8 to 0 V

cc+

= 3 V max -11 to 0 V

V

cc+

Common-mode voltage range referred to pin Vcc ­(T

min

to T

max

)

Operational temperature range (T

min

to T

max

min

to T

6/26 Doc ID 16875 Rev 2

2.7 to 5.5 V

2.9 to 70 V

) -40 to 125 °C

max

TSC1031 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

● Rf1, Rf2 and Rf3 resistors are short-circuited.

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

I

CC1

Table 5. Input

Total supply current V

CC

Total supply current

= 0 V, T

sense

= 50 mV Av = 50 V/V

V

sense

< T

T

min

amb

< T

min

max

< T

amb

< T

max

200 360 µA

300 480 µA

Symbol Parameter Test conditions Min. Typ. Max. Unit

DC common-mode rejection

DC CMR

Variation of V

out

referred to input

versus V

(1)

2.9 V< Vm < 70 V, T

icm

min

< T

amb

< T

90 105 dB

max

AC common-mode rejection

AC CMR

Variation of V

versus V

out

referred to input (peak-to-peak

Av = 50 V/V or 100 V/V

icm

2.9 V< V

< 30 V, 1 kHz sine wave

icm

95 dB

voltage variation)

Supply voltage rejection
Variation of V

Input offset voltage

os

/dT Input offset drift vs. T

I

Input leakage current

lk

I

Input bias current

ib

dV

SVR

V

os

versus V

out

(3)

Av = 50 V/V, 2.7 V< VCC < 5.5 V

(2)

V

=30mV, T

T
T

amb

sense

< T

min

=25°C

amb

< T

max

CC

Av = 50 V/V
T

< T

amb

=0V

< T

amb

=0V

< T

amb

< T

< T

< T

max

max

max

V
T

V
T

min

CC

min

sense

min

min

< T

amb

< T

max

85 100 dB

±500

±1100

-20 +5 µV/°C

1µA

10 15 µA

Rg Input resistor value Valid for Rg1 and Rg2 5 kΩ

V

< VCC < V

min

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 (SEL)

IL

Logic high voltage (SEL)

IH

Gain-select pins (SEL)

sel

leakage input current

.

os

CC

T

< T

amb

< VCC < V

min

< T

amb

< T

< T

min

V

CC

T

min

SEL pin connected to GND or V
T

< T

amb

< T

min

max

max

max

CC

CC

max

max

CC

-0.3 0.5 V

1.2 V

CC

400 nA

µV

V

Doc ID 16875 Rev 2 7/26

Electrical characteristics TSC1031

Table 6. Output

Symbol Parameter Test conditions Min. Typ. Max. Unit

K1

K2 Current multiplier gain

Av Total gain (Av = 2.K1.K2)

ΔV

out

ΔV

out

ΔV

ΔV

ΔV

ΔV

ΔV

I

sc

V

OH

V

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

2. The output voltage accuracy is the difference with the expected theoretical output voltage V
for a more detailed definition.

Except for Av = 100 V/V.

3.

Sense amplifier gain
(K1 = Rg3/Rg1)

/ΔT Output voltage drift vs. T

/ΔI

Output stage load regulation

out

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

Short-circuit current

Output stage high-state saturation
voltage
V

OH=VCC-Vout

Output stage low-state saturation

OL

voltage

(1)

SEL= Gnd
SEL= Vcc+

SEL= Gnd
SEL= Vcc+

Av = 50 V/V
T

min

-10 mA < I
sink or source current

I

out

Av = 50 V/V, T

V

(2)

sense

T

amb

T

min

V

sense

T

amb

T

min

V

sense

T

min

V

sense

T

min

V

sense

T

min

OUT connected to V
GND

V

sense

I

out

V

sense

I

out

< T

amb

=50mV

=25°C

< T

amb

=90mV

=25°C

< T

amb

=20mV T

< T

amb

=10mV T

< T

amb

=5mV T

< T

amb

=1V

=1mA

=-1V

=1mA

< T

out

< T

< T

< T

< T

< T

max

<10 mA

= 25° C

amb

(3)

max

(3)

max

amb

max

amb

max

amb

max

=25° C

=25° C

=25°C

or

CC

10

2.5
5

50

100

±240 ppm/°C

0.3 ±1.5 mV/mA

±2.5

±4

±3.5

±5

±3.5

±5

±5.5

±8

±10
±22

15 26 mA

85 135 mV

80 125 mV

out-th

=Av*V

. See Chapter 5

sense

V/V

%

%

%

%

%

8/26 Doc ID 16875 Rev 2