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PDF ZXCT1041 Data sheet ( Hoja de datos )
| Número de pieza | ZXCT1041 | |
| Descripción | Bidirectional precision high-side current monitor | |
| Fabricantes | Zetex Semiconductors | |
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ZXCT1041
Bidirectional precision high-side current monitor
Description
The ZXCT1041 is a bidirectional precision high-
side current sense monitor. The output voltage
is proportional to the differential input voltage.
Direction of current flow is indicated by the
Flag pin.
The ZXCT1041 provides a fixed gain of 10 for
applications where minimal sense voltage is
required.
The very low offset voltage enables a typical
accuracy of 2% for sense voltages of only
10mV, giving better tolerances for small sense
resistors necessary at higher currents.
The wide input voltage range of 18V down to
as low as 2.7V make it suitable for a range of
applications.
A minimum operating current of just 40A,
combined with a SOT23-5 package makes this
part suitable for portable battery equipment.
Features
• Bidirectional high side measurement
• Output voltage scaling x10
• 2.7V to 20V high side voltage
• 35µA quiescent current
• 1% typical accuracy
• SOT23-5 package
Applications
• Battery management
• Over current monitor
• Battery gas gauging
• Motor control
Typical application circuit
Pin connections
VIN+
RSENSE
VIN-
Flag
GND
VOUT
VSENSE-
VSENSE+
45
VSENSE+ VSENSE-
ZXCT1041
1
GND
2
VOUT
3
Flag
VOUT
Ordering information
Order code
Package
ZXCT1041E5TA
SOT23-5
Partmark
1041
Reel size
(inches)
7
Tape width
(mm)
8
Quantity
per reel
3000
Issue 1 - November 2006
© Zetex Semiconductors plc 2006
1
www.zetex.com
1 page  
ZXCT1041
Application information
The ZXCT1041 uses two current monitors in anti-parallel to provide bidirectional current
measurement. The integrated resistors while having a broad actual value variance provide very
good matching to one another; this provides very tight gain matching from forward current
measurement to reverse current management and removes the need to trim the resistor values.
The internal transconductance setting resistors have a nominal value of 1.5k⍀ thereby setting the
internal transconductance to 1mA/V of VSENSE. The outputs of both current monitors (current) are
summed into an internal common gain-setting resistor of 15k⍀. This sets the overall gain to 10
which has a very small variance due to the very good matching of internal transistors.
To improve accuracy the offset of amplifier 1 is trimmed.
The direction of measured current flow is determined by comparing the voltages applied to the
bases of transconductance transistors (Q1 and Q2). For maximum versatility the flag output uses
an open collector; this allows the ZXCT1041 to monitor rails at a much higher potential than what
the flag output is interfacing to.
A common application for micro-power current monitors is measuring the discharge current of a
rechargeable lithium ion/polymer battery. The ZXCT1041 enables measuring both the charge and
discharge current into the battery and with its wide operating voltage of 2.5 to 20V enables it to
measure the currents in to/ out of up to 4 cells connected in series.
Issue 1 - November 2006
© Zetex Semiconductors plc 2006
5
www.zetex.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ZXCT1041.PDF ] | |
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