LMP8645HVMK/NOPB National Semiconductor, LMP8645HVMK/NOPB Datasheet

IC AMP CURRENT SENSE 6TSOT

LMP8645HVMK/NOPB

Manufacturer Part Number
LMP8645HVMK/NOPB
Description
IC AMP CURRENT SENSE 6TSOT
Manufacturer
National Semiconductor
Datasheet

Specifications of LMP8645HVMK/NOPB

Amplifier Type
Current Sense
Number Of Circuits
1
Slew Rate
0.6 V/µs
-3db Bandwidth
860kHz
Current - Input Bias
13µA
Voltage - Input Offset
1700µV
Current - Supply
2.2mA
Current - Output / Channel
5mA
Voltage - Supply, Single/dual (±)
2.7 V ~ 12 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TSOT-23-6, TSOT-6
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
Gain Bandwidth Product
-
Other names
LMP8645HVMK

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© 2011 National Semiconductor Corporation
Precision High Voltage Current Sense Amplifier
General 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 volt-
age 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 set-
ting 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, au-
tomotive and consumer applications, and it is available in
TSOT-6 package.
Typical Application
LMP™ is a trademark of National Semiconductor Corporation.
300716
LMP8645/LMP8645HV
Features
Typical values, T
Applications
High common-mode voltage Range
— LMP8645
— LMP8645HV
Supply voltage Range
Gain configurable with a single resistor
Max variable gain accuracy (with external resistor) 2.0%
Transconductance
Low offset voltage
Input bias
PSRR
CMRR
Temperature Range
6-Pin TSOT Package
High-side current sense
Vehicle current measurement
Motor controls
Battery monitoring
Remote sensing
Power management
A
= 25°C
30071632
January 31, 2011
−40°C to 125°C
www.national.com
2.7V to 12V
-2V to 42V
-2V to 76V
200 μA/V
12 μA
90 dB
95 dB
1 mV

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LMP8645HVMK/NOPB Summary of contents

Page 1

... The LMP8645 is an ideal choice for industrial, au- tomotive and consumer applications, and it is available in TSOT-6 package. Typical Application LMP™ trademark of National Semiconductor Corporation. © 2011 National Semiconductor Corporation LMP8645/LMP8645HV Features Typical values, T ■ ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Human Body Model For input pins +IN, -IN For all other pins Machine Model Charge device model Supply Voltage (V ...

Page 3

Symbol Parameter I Output current (Note 9) OUT C Max Output Capacitance Load LOAD (Note 9) 5V Electrical Characteristics Unless otherwise specified, all limits guaranteed for MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter V ...

Page 4

Electrical Characteristics Unless otherwise specified, all limits guaranteed for MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter V Input Offset Voltage OS TCV Input Offset Voltage Drift OS (Note 7, Note 9) I ...

Page 5

Note 8: The number specified is the average of rising and falling slew rates and measured at 90% to 10%. Note 9: This parameter is guaranteed by design and/or characterization and is not tested in production. Note 10: Positive Bias ...

Page 6

Connection Diagram Pin Descriptions Pin Name 1 V OUT + Ordering Information Package Part Number LMP8645MK LMP8645MKE LMP8645MKX 6-Pin TSOT LMP8645HVMK LMP8645HVMKE LMP8645HVMKX www.national.com 6-Pin TSOT 30071602 Top ...

Page 7

Typical Performance Characteristics (-IN MΩ. L Supply Curent vs. Supply Voltage AC PSRR vs. Frequency Gain vs. Frequency Unless otherwise specified: T Supply current vs. V 30071625 AC CMRR vs. Frequency 30071612 CMRR vs. V 30071614 7 ...

Page 8

Output voltage vs. V Large Step response Settling time (rise) www.national.com Output voltage vs. V SENSE 30071616 30071618 30071621 8 (ZOOM close to 0V) SENSE 30071617 Small Step response 30071619 Settling time (fall) 30071620 ...

Page 9

Common mode step response (rise) 30071622 Common mode step response (fall) 9 30071615 www.national.com ...

Page 10

Application Information GENERAL The LMP8645 and LMP8645HV are single supply high side current sense amplifiers with variable gain selected through an external resistor and a common mode voltage Range of -2V to 42V or -2V to 76V depending on the ...

Page 11

FIGURE 3. Allowed Gains for Range 2 Also in this Range once selected the R V Range is fixed too. SENSE ≥ Range The max voltage at the R pin is Vout_max, it means that G ...

Page 12

Example 2 The LMP8645 is used to monitor the current in a high bright- ness LED application together with LM340x LED drivers. The LMP8645 is supplied at 3.3V and the max voltage at LED’s string is 30V, the LED brightness ...

Page 13

FIGURE 7. High Side Current Sensing in Driving HP/HB LED 13 30071608 www.national.com ...

Page 14

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted TSOT-6 NS Package Number MK06A 14 ...

Page 15

Notes 15 www.national.com ...

Page 16

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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