Datasheet

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June 2008 Rev 1 1/7

TSC888

Low cost high-side current sense amplifier

Features

■ Independent supply and input common-mode

voltages

■ Wide common-mode operating range: 2.8 V to

24 V

■ Wide supply voltage range: 4 to 24 V

■ Low current consumption: I

max = 1 mA

■ Internally fixed gain: 20 V/V, 50 V/V or 100 V/V

■ Buffered output

Applications

■ Desktop computers and servers SMPS

■ Photovoltaic/solar systems

■ Battery chargers

■ Notebook computers

■ DC motor control

Description

The TSC888 measures a small differential voltage

on a high-side shunt resistor and translates it into

a ground-referenced output voltage. The gain is

internally fixed.

Wide input common-mode voltage range, low

quiescent current, and tiny SOT23-5 packaging

make the TSC888 ideal for use in a wide variety

of applications.

Input common-mode and power supply voltages

are independent. Common-mode voltage can

range from 2.8 V to 24 V in operating conditions.

Current consumption lower than 1 mA and wide

supply voltage range allow to connect the power

supply to either side of the current measurement

shunt with minimal error.

SOT23-5

(Plastic package)

Gnd

Vcc

Pin connections

(top view)

www.st.com

Summary of content (7 pages)

PAGE 1
TSC888 Low cost high-side current sense amplifier Features ■ Independent supply and input common-mode voltages ■ Wide common-mode operating range: 2.
PAGE 2
Application schematics and pin description 1 TSC888 Application schematics and pin description The TSC888 high-side current-sense amplifier features a 2.8 V to 24 V input common-mode range that is independent of supply voltage. The main advantage of this feature is to allow high-side current sensing at voltages much greater than the supply voltage (VCC). The TSC888 can therefore be supplied by a 5 Vsb line and monitor a 3.3 V, 5 V or 12 V power line.
PAGE 3
TSC888 2 Absolute maximum ratings and operating conditions Absolute maximum ratings and operating conditions Table 2. Absolute maximum ratings Symbol Vid Vin Parameter Input pins differential voltage (Vp-Vm) Input pin voltages (Vp, Vm) (1) (1) Value Unit ±2 V -0.3 to 30 V -0.3 to 25 V VCC DC supply voltage Vout DC output pin voltage(1) -0.
PAGE 4
Electrical characteristics 3 TSC888 Electrical characteristics The electrical characteristics given in the following tables are measured under the following test conditions unless otherwise specified: Tamb=25°C, Vcc=5V, Vsense=Vp-Vm=50mV, Vm=12V, no load on Out Table 4. Supply Symbol ICC Table 5. Parameter Total supply current Min. Typ. Vsense = 0 Max. Unit 1 mA Max. Unit Input Symbol Parameter Test conditions Min. Typ.
PAGE 5
TSC888 4 Package information Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark.
PAGE 6
Ordering information TSC888 5 Ordering information Table 8. Order codes Order code Temperature range Package Packaging TSC888AILT TSC888BILT -40°C, +85°C SOT23-5 Tape & reel TSC888CILT 6 Revision history Table 9. Document revision history Date Revision 26-Jun-2008 Rev 1 6/7 Changes Initial release.
PAGE 7
TSC888 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.