Features Typical values, TA = 25°C High common-mode voltage Range LMP8645 -2V to 42V LMP8645HV -2V to 76V Supply voltage Range 2.7V to 12V Gain configurable with a single resistor Max variable gain accuracy (with external resistor) 2.0% Transconductance 200 μA/V Low offset voltage 1 mV Input bias 12 μA PSRR 90 dB CMRR 95 dB Temperature Range −40°C to 125°C 6-Pin TSOT Package Description The LMP8645 and the LMP8645HV are precision current sense amplifiers that detect small differential voltages across a sense resistor in the presence of high input common mode voltages with a supply voltage Range from 2.7V to 12V. The LMP8645 accepts input signals with common mode voltage Range from -2V to 42V, while the LMP8645HV accepts input signal with common mode voltage Range from -2V to 76V. The LMP8645 and LMP8645HV have adjustable gain for applications where supply current and high common mode voltage are the determining factors. The gain is configured with a single resistor, providing a high level of flexibility, the accuracy could be as low as 2% (max) including the gain setting resistor. The output is buffered in order to provide low output impedance. This high side current sense amplifier is ideal for sensing and monitoring currents in DC or battery powered systems, excellent AC and DC specifications over temperature, and keeps errors in the current sense loop to a minimum. The LMP8645 is an ideal choice for industrial, automotive and consumer applications, and it is available in TSOT-6 package. Applications High-side current sense Vehicle current measurement Motor controls Battery monitoring Remote sensing Power management

Also Recommended LMP8601▲ -22 To 60 CMVR, Fixed Gain Of 20V/V LMP8602▲ -22 To 60 CMVR, Fixed Gain Of 50V/V LMP8603▲ -22 To 60 CMVR, Fixed Gain Of 100V/V first page

Typical Application click for larger image first page	Block Diagram click for larger image block diagram
Typical Performance click for larger image Is vs. Vs 3 temps

Parameters / Values	LMP8645	LMP8601	LMP8602	LMP8603
Vcm Min	-2 Volt	-22 Volt	-22 Volt	-22 Volt
Vcm Max	42, 76 Volt	60 Volt	60 Volt	60 Volt
Gain Range	1 to 100	20	50	100
Bi-Directional	No	Yes	Yes	Yes
Offset Voltage max, 25C	1 mV	0.15 mV	0.15 mV	0.15 mV
Bandwidth,	850 kHz	60 kHz	60 kHz	60 kHz
DC CMRR typ	95 dB	105 dB	105 dB	105 dB
Supply Min	2.7 Volt	3 Volt	3 Volt	3 Volt
Supply Max	12 Volt	5.5 Volt	5.5 Volt	5.5 Volt
Supply Current	0.61 mA	1.3 mA	1.5 mA	1.5 mA
Temperature Min	-40 deg C	-40 deg C	-40 deg C	-40 deg C
Temperature Max	125 deg C	125 deg C	125 deg C	125 deg C
Special Features	Buffered Out	Undefined	Undefined	Undefined
Topology	V to I	Level Shift	Level Shift	Level Shift
Voltage Noise	120 nV/root(Hz)	890 nV/root(Hz)	890 nV/root(Hz)	890 nV/root(Hz)
Filter Option	No	Yes	Yes	Yes
Gain Error	2 %	0.5 %	0.5 %	0.375 %
TcVos Max	7 uV/degC	10 uV/degC	10 uV/degC	10 uV/degC
Input Resistance typ	95 dBm/Hz	295 dBm/Hz	295 dBm/Hz	295 dBm/Hz
AC CMRR @10kHz typ	35 dB	83 dB	83 dB	83 dB
PowerWise	No	No	No	No
Automotive	No	Yes	Yes	Yes

Datasheets

Title		Size	Date	Other Language
	LMP8645 Precision High Voltage Current Sense Amplifier	410 Kbytes	31-Jan-11

Application Notes

Title		Size	Date	Other Language
	AN-1975: Application Note 1975 LMP8640 / LMP8645 Evaluation Board User Guide	190 Kbytes	15-Jul-10

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMP8645MK/NOPB RoHS Status	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 1000 DIGI-KEY Worldwide 0	$0.89 each at 1K+ pcs	reel of 1000
LMP8645MKE/NOPB RoHS Status	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 250 DIGI-KEY Worldwide 3966 FARNELL Europe and Asia 653 MOUSER Worldwide 303 NEWARK Americas 533	$0.89 each at 1K+ pcs	reel of 250
LMP8645MKX/NOPB RoHS Status	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.89 each at 1K+ pcs	reel of 3000

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMP8645.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMP8645 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMP8645MKEVAL/NOPB	Evaluation Board for the LMP8645	Full production Lead Free (RoHS)	Distributor Region Qty AVNET-EM Worldwide 4 DIGI-KEY Worldwide 4 MOUSER Worldwide 2 TAYLOR Americas 3	$49.00 each	1
Description: The LMP8645 Current Sense Evaluation Board is designed to evaluate the LMP8645, Precision Current Sensing Amplifier with adjustable gain. This board show a typical configuration of a bidirectional current sense with two LMP8645 parts mounted on the PCB together with the required de-coupling capacitor, power supply connections, Input and Output connectors. Contents: Assembled LMP8645MKEVAL Board LMP8645 Datasheet LMP8645 AN-1975

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMP8645MK/NOPB	12.959	TSOT	6	1	260	Detail	Download	spice file	AJ6A XTT
LMP8645MKE/NOPB	12.959	TSOT	6	1	260	Detail	Download	spice file	AJ6A XTT
LMP8645MKX/NOPB	12.959	TSOT	6	1	260	Detail	Download	spice file	AJ6A XTT

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMP8645.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMP8645 is located at RoHS Status.

Design Tools

Title	Size	Date
ORCAD Files

CAD Symbols and Models Download LMP8645 CAD Symbols

Models spice file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMP8645MK	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LMP8645MKE	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LMP8645MKX	ABCD150XV1	0	3868	0	0	2595000	2	736338335

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMP8645.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMP8645 is located at RoHS Status.

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