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TM
MP8100
Precision High-Side Current-Sense Amplifier
The Future of Analog IC Technology
TM
INITIAL RELEASE - SPECIFICATIONS SUBJECT TO CHANGE
DESCRIPTION
The MP8100 is a low-cost, precision, high-side current-sense amplifier. This device operates from a single 2.5V to 18V supply and typically consumes 17A. It is ideal for today's notebook computers, cell phones and other systems where battery/DC current monitoring is critical. High-side current monitoring is especially useful in battery-powered systems since it does not interfere with the ground path of the battery charger. The input common-mode range of 1.5V to 18V is independent of the supply voltage and ensures that the current-sense feedback remains viable even when connected to a 2-cell battery pack in deep discharge.
FEATURES
* * * * * * * * * * * * * * * * Low-Cost, Compact Current-Sense Solution 17A Typical Supply Current 2.5V to 18V Operating Supply Voltage 1.5V to 18V Input Common Mode Range 1A Typical Shutdown Current 250V Input Offset Voltage High Current Sensing Capability Low 100m Output Impedance (Optional) Available in an 8-Pin SOIC Package Portable PCs PDA's Smart Battery Packs Cell Phones Portable Test/Measurement Systems Battery-Operated Systems Energy Management Systems
APPLICATIONS
"MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN LOAD
3 7 1 RG1 VCC RG2 6
+ --
MP8100
OUT2 OUT1
SHDN GND
8 5
SHUTDOWN VOLTAGE
+ --
4
COUT1 Opt.
COUT2 100pF
ROUT2 Opt.
MP8100_TAC_S01
MP8100 Rev. 0.91 4/14/2006
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved.
1
TM
MP8100 - PRECISION HIGH-SIDE CURRENT-SENSE AMPLIFIER INITIAL RELEASE - SPECIFICATIONS SUBJECT TO CHANGE
PACKAGE REFERENCE
TOP VIEW
SHDN NC RG1 GND 1 2 3 4 8 7 6 5 OUT2 VCC RG2 OUT1
ABSOLUTE MAXIMUM RATINGS (1)
VCC, RG1, RG2 to GND ............. -0.3V to +20V Maximum Differential Input Voltage, RG1 to RG2 ............................................................... 5V Storage Temperature .............-65C to +150C
Recommended Operating Conditions
(2)
VCC, RG1, RG2 to GND ................... 2.5V to 18V Operating Temperature .............-40C to +85C
Thermal Resistance
(3)
MP8100_PD01_SOIC8
SOIC8..................................... 90 ...... 42... C/W Continuous Power Dissipation (TA=70C) ...............................................800mW
Notes: 1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its operating conditions. 3) Measured on approximately 1" square of 1 oz copper.
JA
JC
Part Number* MP8100DS *
Package SOIC8
Temperature -40C to +85C
For Tape & Reel, add suffix -Z (eg. MP8100DS-Z) For Lead Free, add suffix -LF (eg. MP8100DS-LF-Z)
ELECTRICAL CHARACTERISTICS
VCC = 10V, VSHDN = 0V, TA = +25C, unless otherwise noted.
Parameter Supply Voltage Supply Current OUT1 Input Offset Voltage OUT2 Input Offset Voltage Input Bias Current OUT1 Current Accuracy No-Load OUT1 Error Low-Level OUT1 Error No-Load OUT2 Error Low-Level OUT2 Error Power Supply Rejection Ratio Shutdown Supply Current SHDN Threshold Voltage SHDN Input Low Current SHDN Input High Current OUT1 Output Voltage Range OUT2 Output Voltage Range Symbol VCC ICC VOS1 VOS2 IRG1, IRG2 IRG1/IOUT1 VSENSE = 100mV VSENSE = 0V VSENSE = 5mV VSENSE = 0V VSENSE = 5mV 2.5V < VCC < 18V, VSENSE = 100mV VSHDN = Float; VCC = 18V 0.7 VSHDN = 3V ILOAD = 0A; VCC = 18V Conditions Min 2.5 17 0.25 0.25 4 1 1 2 1 2 0.05 1 1.0 -300 +500 VCC - 0.15 VCC - 1 5 1.8 Typ Max 18 30 1.20 1.20 Units V A mV mV nA % A A A A %/V A V nA nA V V
PSRR ICC(SHDN) VTH_SHUTDOWN IIL IIH VOUT1 VOUT2
MP8100 Rev. 0.91 4/14/2006
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved.
2
TM
MP8100 - PRECISION HIGH-SIDE CURRENT-SENSE AMPLIFIER INITIAL RELEASE - SPECIFICATIONS SUBJECT TO CHANGE
ELECTRICAL CHARACTERISTICS (continued)
VCC = 10V, VSHDN = 0V, TA = +25C, unless otherwise noted.
Parameter OUT1 Rise, Fall Time
(4)
Symbol tR, tF
Conditions VSENSE = 10mV to 150mV, ROUT1 = 10k, RG1 = RG2 = 2k, COUT1 = 50pF, 10% to 90% VSENSE = 10mV to 150mV, R OUT2 = 100k, RG1 = RG2 = 2k, COUT2 = 100pF, 10% to 90%
Min
Typ TBD
Max
Units s
OUT2 Rise, Fall Time (4) Maximum OUT1 Current (4) Maximum OUT2 Current
(4)
tR, tF IOUT1 IOUT2
TBD 500 5
s A mA
Notes: 4) Guaranteed by design. 5) Input common mode range cannot exceed the supply voltage.
PIN FUNCTIONS
Pin # 1 2 3 4 5 6 7 8 Name SHDN NC RG1 GND OUT1 RG2 VCC OUT2 Description Shutdown. Connect to ground for normal operation. When high, supply current is less than 5A. Not Connected. Gain Resistor. Connect to battery side of current-sense resistor through the gain resistor. Ground or Battery Negative Terminal. Output For Driving Resistive Loads. Gain Resistor. Connect to load side of current-sense resistor through the gain resistor. Power Input. Connect to Battery Input. Output For Driving Capacitive Loads.
MP8100 Rev. 0.91 4/14/2006
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved.
3
TM
MP8100 - PRECISION HIGH-SIDE CURRENT-SENSE AMPLIFIER INITIAL RELEASE - SPECIFICATIONS SUBJECT TO CHANGE
OPERATION
The MP8100 is a current-sense amplifier with a wide operating input voltage range of 2.5V to 18V.
SHDN 1
BIAS + ENABLE
-BUFFER + 8 OUT2
NC 2
7 VCC
6 RG2
RG1 3
-+ ERROR AMPLIFIER 5 OUT1
GND 4
MP8100_F01_BD
Figure 1--Functional Block Diagram
APPLICATION INFORMATION
COMPONENT SELECTION
Table 1--Suggested Component Values
Full-Scale Load Current, ISENSE (A) 0.1 1 5 10 Current Sense Resistor (m) 500 50 10 5 Gain Setting Resistor (k) (RG1 = RG2) 2 2 2 2 ROUT1 (k) 20 20 20 20 Gain 10 10 10 10
The value of VOUT1 can be obtained with the equation:
VOUT = IL x R S x R OUT1 = IL x R S x Gain R G1
Where RG1 is the sense resistor and IL is the load current.
MP8100 Rev. 0.91 4/14/2006
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved.
4
TM
MP8100 - PRECISION HIGH-SIDE CURRENT-SENSE AMPLIFIER INITIAL RELEASE - SPECIFICATIONS SUBJECT TO CHANGE
PACKAGE INFORMATION
SOIC8
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications.
MP8100 Rev. 0.91 4/14/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved.
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