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ZXCT1030
HIGH-SIDE CURRENT MONITOR WITH COMPARATOR
DESCRIPTION
The ZXCT1030 is a high side current sense monitor containing an internal reference and comparator with a non-latching output. Using this device eliminates the need to disrupt the ground plane when sensing a load current. The wide input voltage range of 20V down to as low as 2.2V make it suitable for a range of applications. Dynamics and supply current are optimised for the processing of fast pulses, associated with switch mode applications.
APPLICATIONS
* Battery chargers * Electronic fuse * DC motor control * Over current monitor * Power management * Inrush current limiting
FUNCTIONAL BLOCK DIAGRAM FEATURES
* Low cost, accurate high-side current sensing. * Output voltage scaling. * Up to 18V output. * 2.2V - 20V supply range. * 270 A quiescent current. * 1.5% typical accuracy. * MSOP8 Package. * Voltage reference on chip * Comparator on chip
ZXCT1030 Comp_in Vref_out + Vin sense+ Current Monitor Vout Rcomp Rsense senseTo load
Vcc
5V Vcomp_supply
Comp_out
ORDERING INFORMATION
Device ZXCT1030X8TA ZXCT1030X8TC Reel size 7" 13" Tape width 12mm 12mm Quantity per reel 500 units 2500 units
DEVICE MARKING
* ZXCT
1030
PROVISIONAL ISSUE J - MAY 2004 1
SEMICONDUCTORS
ZXCT1030
Absolute Maximum Ratings
Voltage on any pin Operating Temperature Storage Temperature Package Power Dissipation MSOP8 -0.6V and Vcc +0.6V -40 to 85C -55 to 125C (TA = 25C) 500mW
ELECTRICAL CHARACTERISTICS Test Conditions TA = 25C, Vin = Vcc = 15V
SYMBOL PARAMETER CONDITIONS Min V CC V sense+ V out V CC Range Sense+ range Output Voltage V sense V sense V sense V sense V sense V sense = = = = = = 0V 10mV 30mV 50mV 100mV 500mV 2.2 2.2 0 88 284 480 970 4500 1.2 2 100 300 500 1000 5000 1.5 30 LIMITS Typ Max 20 V CC 10 112 316 520 1030 5500 1.8 mV mV mV mV mV mV K ppm/ C V UNIT
R out V out TC I CC I sense+ I senseV sense V cm
3 2
Output resistance V out temperature coefficient Supply current Sense+ input current Sense- input current Sense Voltage Common Mode Range
V sense- = 15V, V out = 1V
V sense- = 15V
170 25
270 48 70
350 90 220 500
A A nA mV V
V sense- = 14.9V
25 0
V cc = 15V V comp_supply = 5V V comp_in = V ref V sense = 10mV
2.8
Acc Gain BW
Accuracy V out / V sense Bandwidth
V sense = 100mV V sense = 100mV V sense = 10mVp-p V sense = 100mVp-p
-3 9.7 10.0 3 6
3 10.3
%
MHz MHz
2 3
Vsense = (Vsense +) - (Vsense -) Level of Vin where comparator output defaults to `off'.
PROVISIONAL ISSUE J - MAY 2004
SEMICONDUCTORS
2
ZXCT1030
Absolute Maximum Ratings
Voltage on any pin Operating Temperature Storage Temperature Package Power Dissipation MSOP8 -0.6V and Vcc +0.6 V -40 to 85C -55 to 125C (TA = 25C) 500mW
ELECTRICAL CHARACTERISTICS (Cont.) Test Conditions TA = 25C, Vin = Vcc = 15V
SYMBOL PARAMETER CONDITIONS Min Comparator Vcomp VH IB Input Voltage Hysteresis Input Bias V comp_supply = 5V R comp = 10k V comp_supply = 5V V comp- in = 1V R comp = 10k V comp_supply = 5V R comp = 10k V comp_supply = 5V R comp = 10k V comp_supply = 5V R comp = 10k V OL = 0.4V V comp_supply = 5V R comp = 10K 2 1.0 30 5 0.005 15 50 100 10 V mV nA LIMITS Typ Max UNIT
TD V OL V OH I OL I OH
Propagation Delay Output Voltage Low Output Voltage High Output Sink Current Output High Leakage Current
100 150 200 V comp_
supply
ns mV V mA A
Voltage Reference V ref Reference Current =0 A Reference Current = -300 A Reference Current = +5 A Change in Vref Isource 5 A to Isink 300 A 1.200 1.200 1.200 1.240 1.240 1.240 10 30 Supply rejection 0.01 1.280 1.280 1.280 V V V mV ppm/ C %/V
delta V ref TC PSR
PROVISIONAL ISSUE J - MAY 2004 3
SEMICONDUCTORS
ZXCT1030
TYPICAL CHARACTERISTICS
PROVISIONAL ISSUE J - MAY 2004
SEMICONDUCTORS
4
ZXCT1030
Voltage output Current Monitor
Referring to the block diagram, the current monitor takes the small voltage developed across the sense resistor (Vsense) and transfers it from the large common mode supply voltage to a ground-referenced signal with a gain of 10. The sense input common mode range is 2.2V to 20V. In this range, a linear output voltage is delivered.
Comparator
The open collector output is active low and is asserted when Vsense x 10 (Vout) > Vcomp_in. It can be connected to any voltage rail up to Vin via a pull-up resistor. Suggest values for the resistor are in the range of 10-100k . In the case where high load currents or a short circuit occurs, thus reducing the common mode signals (V+, V-) typically below 2.2V, the comparator will default to the asserted state. This can eliminate a closed loop system `latch-up' condition, allowing the controller to remove the applied power.
Reference
The bandgap reference allows the comparator to compare the translated Vsense with threshold value chosen by the user which can be any voltage from 0 to 1.24V, configured by two external resistors which forms Vcomp_in. The output current which can be drawn from the comparator reference (Iref source) is limited to 5A, making potentiometers 250k suitable for setting a threshold level. Where a lower potentiometer resistor value is used, an additional resistor value should be inserted between Vref and Vcc to maintain sufficient current for the reference. (as shown in figure 1.0).
Stability
To ensure stable operation of the ZXCT1030, it is recommended a decoupling capacitor is placed across the VCC and ground connections. A ceramic 10 F will be adequate.
FIGURE 1.0 External resistor for reference level
PIN CONNECTIONS
MSOP8
Vcc 1 Sense- 2 Sense+ 3 GND 4
8 7
Comp_out
Vout 6 Vref_out
5 Comp_in
Pin Name Vcc SenseSense+
Pin Function Supply voltage Negative sense input Positive sense input Ground Comparator input, usually a ratio of the reference or other control signal. Reference output Current Monitor output voltage Open collector comparator output
The Voltage reference has a maximum current sink capability. This magnitude of current will be influenced by the value of R1 which is inserted between Vref and Vcc. The value of current flowing through R1 can be expressed as: I = (Vcc -Vref) / R1
GND Comp_in
Vref_out Vout Comp_out
PROVISIONAL ISSUE J - MAY 2004 5
SEMICONDUCTORS
ZXCT1030
PACKAGE DIMENSIONS
D
PACKAGE DIMENSIONS
DIM Millimetres MIN MAX 1.10 0.15 0.40 0.23 3.10 Inches MIN 0.002 0.010 0.005 0.114 MAX 0.043 0.006 0.016 0.009 0.122
87
65
A A1 B
H
0.05 0.25 0.13 2.90
A
PAD LAYOUT DETAILS
(c) Zetex Semiconductors plc 2004
Europe Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com Americas Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY 11788 USA Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 usa.sales@zetex.com Asia Pacific Zetex (Asia) Ltd 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com Corporate Headquaters Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telephone (44) 161 622 4444 Fax: (44) 161 622 4446 hq@zetex.com
These offices are supported by agents and distributors in major countries world-wide. This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. For the latest product information, log on to www.zetex.com
E
1 2 34
eX6
C D e
0.65 BSC 2.90 3.10
0.0256 BSC 0.114 0.122
B
C
L
SEMICONDUCTORS
A1
E H L
4.90 BSC 0.40 0 0.70 6
0.193 BSC 0.016 0 0.028 6
PROVISIONAL ISSUE J - MAY 2004 6

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