LT1999MPMS8-20#PBF Linear Technology, LT1999MPMS8-20#PBF Datasheet

SC-Amps/Current Sense, High Voltage, Bidirectional Current Sense Amplifier

LT1999MPMS8-20#PBF

Manufacturer Part Number
LT1999MPMS8-20#PBF
Description
SC-Amps/Current Sense, High Voltage, Bidirectional Current Sense Amplifier
Manufacturer
Linear Technology
Datasheet

Specifications of LT1999MPMS8-20#PBF

Input Bias Current
137.5µA
Output Current Per Channel
26mA
Input Offset Voltage
1.5mV
Bandwidth
2MHz
Cmrr
120dB
Slew Rate
3V/µs
Supply Voltage Range
4.5V To 5.5V
Supply Current
3µA
Rohs Compliant
Yes
No. Of Amplifiers
2

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LT1999MPMS8-20#PBFLT1999MPMS8-20
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LT1999MPMS8-20#PBF
Manufacturer:
LT
Quantity:
46
Company:
Part Number:
LT1999MPMS8-20#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
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APPLICATIONS
n
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TYPICAL APPLICATION
Buffered Output with 3 Gain Options:
10V/V, 20V/V, 50V/V
Gain Accuracy: 0.5% Max
Input Common Mode Voltage Range: –5V to 80V
AC CMRR > 80dB at 100kHz
Input Offset Voltage: 1.5mV Max
–3dB Bandwidth: 2MHz
Smooth, Continuous Operation Over Entire Common
Mode Range
4kV HBM Tolerant and 1kV CDM Tolerant
Low Power Shutdown <10μA
–55°C to 150°C Operating Temperature Range
8-Lead MSOP and 8-Lead SO (Narrow) Packages
High Side or Low Side Current Sensing
H-Bridge Motor Control
Solenoid Current Sense
High Voltage Data Acquisition
PWM Control Loops
Fuse/MOSFET Monitoring
V
S
R
S
5V
V
V
+IN
–IN
5V
0.1μF
1
2
3
4
V
+
V
V
4k
4k
+
+
0.8k
0.8k
+
LT1999
SHDN
+
V
R
V
+
G
+
1999 TA01a
160k
160k
2μA
DESCRIPTION
High Voltage, Bidirectional
The LT
amplifi er, designed to monitor bidirectional currents over
a wide common mode range. The LT1999 is offered in
three gain options: 10V/V, 20V/V, and 50V/V.
The LT1999 senses current via an external resistive shunt
and generates an output voltage, indicating both magnitude
and direction of the sensed current. The output voltage is
referenced halfway between the supply voltage and ground,
or an external voltage can be used to set the reference
level. With a 2MHz bandwidth and a common mode input
range of –5V to 80V, the LT1999 is suitable for monitoring
currents in H-Bridge motor controls, switching power
supplies, solenoid currents, and battery charge currents
from full charge to depletion.
The LT1999 operates from an independent 5V supply and
draws 1.55mA. A shutdown mode is provided for minimiz-
ing power consumption.
The LT1999 is available in an 8-lead MSOP or SOP package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
8
7
6
5
V
V
V
SHDN
OUT
REF
Current Sense Amplifier
®
1999 is a high speed precision current sense
0.1μF
LT1999-10/LT1999-20/
2.5V
Full Bridge Armature Current Monitor
TIME (10μs/DIV)
V
V
V
OUT
OUT
+IN
LT1999-50
1999 TA01b
1999fa
1

Related parts for LT1999MPMS8-20#PBF

LT1999MPMS8-20#PBF Summary of contents

Page 1

... A shutdown mode is provided for minimiz- ing power consumption. The LT1999 is available in an 8-lead MSOP or SOP package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. + ...

Page 2

... LT1999IS8-10#TRPBF LT1999HS8-10#PBF LT1999HS8-10#TRPBF LT1999MPS8-10#PBF LT1999MPS8-10#TRPBF LT1999CMS8-20#PBF LT1999CMS8-20#TRPBF LT1999IMS8-20#PBF LT1999IMS8-20#TRPBF LT1999HMS8-20#PBF LT1999HMS8-20#TRPBF LT1999MPMS8-20#PBF LT1999MPMS8-20#TRPBF 2 (Note 1) Specified Temperature Range (Note 6) LT1999C .................................................. 0°C to 70°C LT1999I ................................................–40°C to 85°C LT1999H ............................................ –40°C to 125° 0.3V, –0.3V LT1999MP ......................................... –55°C to 150°C Junction Temperature ........................................... 150°C Storage Temperature Range .................. – ...

Page 3

... LT1999HS8-20#TRPBF LT1999MPS8-20#PBF LT1999MPS8-20#TRPBF LT1999CMS8-50#PBF LT1999CMS8-50#TRPBF LT1999IMS8-50#PBF LT1999IMS8-50#TRPBF LT1999HMS8-50#PBF LT1999HMS8-50#TRPBF LT1999MPMS8-50#PBF LT1999MPMS8-50#TRPBF LT1999CS8-50#PBF LT1999CS8-50#TRPBF LT1999IS8-50#PBF LT1999IS8-50#TRPBF LT1999HS8-50#PBF LT1999HS8-50#TRPBF LT1999MPS8-50#PBF LT1999MPS8-50#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. ...

Page 4

LT1999-10/LT1999-20/ LT1999-50 ELECTRICAL CHARACTERISTICS temperature range, 0°C < T < 70°C for C-grade parts, –40°C < otherwise specifications are 25° See Figure 2. SYMBOL PARAMETER CMRR Sense Input Common Mode Rejection e Differential ...

Page 5

ELECTRICAL CHARACTERISTICS temperature range, –55°C < T < 150°C for MP-grade parts, otherwise specifications are floating floating, unless otherwise specified. See Figure 2. SHDN REF SYMBOL PARAMETER V Full-Scale Input Sense Voltage (Note ...

Page 6

LT1999-10/LT1999-20/ LT1999-50 ELECTRICAL CHARACTERISTICS temperature range, –55°C < T < 150°C for MP-grade parts, otherwise specifications are floating floating, unless otherwise specified. See Figure 2. SHDN REF SYMBOL PARAMETER t Common Mode Step ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Input Common Mode – (V) CM 1999 G01 Supply Current vs SHDN ...

Page 8

LT1999-10/LT1999-20/ LT1999-50 TYPICAL PERFORMANCE CHARACTERISTICS Input Referred Voltage Offset vs Temperature and Gain Option 1500 V = 12V CM 12 UNITS PLOTTED 1000 500 0 –500 –1000 LT1999-10 LT1999-20 LT1999-50 –1500 –55 –30 – TEMPERATURE (°C) LT1999-10 Small ...

Page 9

TYPICAL PERFORMANCE CHARACTERISTICS LT1999-10 Pulse Response V SENSE V OUT 1999 G17 TIME (2μs/DIV) LT1999-10 2V Step Response Settling Time 4.5 4.0 V OUT 3.5 3.0 2.5 2.0 OUTPUT ERROR 1.5 1.0 0.5 TIME (1μs/DIV) LT1999-50 2V Step Response Settling ...

Page 10

LT1999-10/LT1999-20/ LT1999-50 TYPICAL PERFORMANCE CHARACTERISTICS LT1999-10 Common Mode Rising Edge Step Response TIME (0.5μs/DIV) LT1999-20 Common Mode Rising Edge Step Response V CM TIME (0.5μs/DIV) LT1999-50 Common Mode Rising Edge Step Response V CM TIME (0.5μs/DIV) ...

Page 11

TYPICAL PERFORMANCE CHARACTERISTICS LT1999 Input Referred Noise Density vs Frequency 1000 100 10 0.001 0.01 0 1000 10000 FREQUENCY (kHz) 1999 G31 SHDN Pin Current vs SHDN Pin Voltage and Temperature ...

Page 12

LT1999-10/LT1999-20/ LT1999-50 PIN FUNCTIONS + V (Pins 1, 4): Power Supply Voltage. Pins 1 and 4 are tied internally together. The specifi ed range of operation is 4.5V to 5.5V, but lower supply voltages (down to ap- proximately 4V) is ...

Page 13

BLOCK DIAGRAM 1 +IN 2 – TEST CIRCUIT + – – – SHDN V + –IN – 0. ...

Page 14

LT1999-10/LT1999-20/ LT1999-50 APPLICATIONS INFORMATION The LT1999 current sense amplifi er provides accurate bidirectional monitoring of current through a user-selected sense resistor. The voltage generated by the current fl owing in the sense resistor is amplifi fi xed ...

Page 15

APPLICATIONS INFORMATION Input Common Mode Range The LT1999 was optimized for high common mode re- jection. Its input stage is balanced and fully differential, designed to amplify differential signals and reject common mode signals. There is negligible crossover distortion due ...

Page 16

LT1999-10/LT1999-20/ LT1999-50 APPLICATIONS INFORMATION Shutdown Capability If SHDN (Pin 8) is driven to within 0.5V of GND, the LT1999 is placed into a low power shutdown state in which the part will draw about 3μA from the V pins (+IN ...

Page 17

APPLICATIONS INFORMATION The REF pin should be either driven by a low source im- pedance (<100Ω) or should be bypassed with at least 1nF to a low impedance, low noise, signal ground plane (see Figure 4). Larger bypass capacitors on ...

Page 18

LT1999-10/LT1999-20/ LT1999-50 APPLICATIONS INFORMATION Fuse Monitor The inputs can be overdriven without fear of damaging the LT1999. This makes the LT1999 ideal for monitoring fuses if either +IN or –IN are shorted to ground while the other is at the ...

Page 19

TYPICAL APPLICATIONS Solenoid Current Monitor The solenoid of Figure 7 consists of a coil of wire in an iron case with permeable plunger that acts as a movable element. When the MOSFET turns on, the diode is reversed biased off, ...

Page 20

LT1999-10/LT1999-20/ LT1999-50 TYPICAL APPLICATIONS SOLENOID + 0.8k R SENSE 0. – OFF 4 0.1μF Figure 8. Solenoid Current Monitor for Non-Grounded Solenoids. ...

Page 21

TYPICAL APPLICATIONS 24V V H-BRIDGE BRIDGE 5V PWM INPUT PWM IN DIRECTION BRAKE INPUT GND Figure 9. Armature Current Monitor for DC Motor Applications Figure 10. LT1999 Output Waveforms for the Circuit of Figure 9 5V 10μ ...

Page 22

LT1999-10/LT1999-20/ LT1999-50 PACKAGE DESCRIPTION 0.889 ± 0.127 (.035 ± .005) 5.23 3.20 – 3.45 (.206) (.126 – .136) MIN 0.65 0.42 ± 0.038 (.0256) (.0165 ± .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING ...

Page 23

... Revised +IN and –IN pin descriptions in Pin Functions section Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 24

... Slew Rate, 230μA per Amplifier www.linear.com ● BAT 42V 5V 0.1μ SHDN 0.1μ OUT REF + +IN V LTC2433-1 SCK OUT V – 6 REF –IN SDO 0.1μ 0511 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2010 10μF 1999fa ...

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