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Linear Technology Electronic Components Datasheet

LT1999-20 Datasheet

Bidirectional Current Sense Amplifier

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LT1999-10/LT1999-20/
LT1999-50
High Voltage, Bidirectional
Current Sense Amplifier
Features
nn Buffered Output with 3 Gain Options:
10V/V, 20V/V, 50V/V
nn Gain Accuracy: 0.5% Max
nn Input Common Mode Voltage Range: –5V to 80V
nn AC CMRR > 80dB at 100kHz
nn Input Offset Voltage: 1.5mV Max
nn –3dB Bandwidth: 2MHz
nn Smooth, Continuous Operation Over Entire Common
Mode Range
nn 4kV HBM Tolerant and 1kV CDM Tolerant
nn Low Power Shutdown <10µA
nn –55°C to 150°C Operating Temperature Range
nn 8-Lead MSOP and 8-Lead SO (Narrow) Packages
nn 8-Lead MSOP Pinout Option Engineered for FMEA
Applications
nn High Side or Low Side Current Sensing
nn H-Bridge Motor Control
nn Solenoid Current Sense
nn High Voltage Data Acquisition
nn PWM Control Loops
nn Fuse/MOSFET Monitoring
Description
The LT®1999 is a high speed precision current sense am-
plifier, 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 monitor-
ing 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
minimizing power consumption.
The LT1999 is available in an 8-lead SOP, an 8-lead MSOP
(original pinout), or an 8-lead pinout option engineered
for FMEA.
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.
Typical Application
VS
RS
5V
1
V+
V+IN 2
4k
V–IN
V+
3 4k
5V
4
0.1µF
V+
LT1999
SHDN
+
0.8k
0.8k
V+
2µA
RG
8 VSHDN
+
V+
7 VOUT
160k
6 VREF
160k
5
0.1µF
1999 TA01a
For more information www.linear.com/LT1999
Full Bridge Armature Current Monitor
VOUT
2.5V
V+IN
TIME (10µs/DIV)
1999 TA01b
1999fd
1


Linear Technology Electronic Components Datasheet

LT1999-20 Datasheet

Bidirectional Current Sense Amplifier

No Preview Available !

LT1999-10/LT1999-20/
LT1999-50
Absolute Maximum Ratings (Note 1)
Differential Input Voltage
+IN to –IN (Notes 1, 3).................................. ±60V, 10ms
+IN to GND, –IN to GND (Note 2).............. –5.25V to 88V
Total Supply Voltage (V+ to GND).................................6V
Input Voltage Pins 6 and 8 .................... V+ + 0.3V, –0.3V
Output Short-Circuit Duration (Note 4)............. Indefinite
Operating Ambient Temperature (Note 5)
LT1999C...............................................–40°C to 85°C
LT1999I.................................................–40°C to 85°C
LT1999H............................................. –40°C to 125°C
LT1999MP.......................................... –55°C to 150°C
Specified Temperature Range (Note 6)
LT1999C................................................... 0°C to 70°C
LT1999I.................................................–40°C to 85°C
LT1999H............................................. –40°C to 125°C
LT1999MP.......................................... –55°C to 150°C
Junction Temperature............................................ 150°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
ORIGINAL MSOP PINOUT
V+ 1
+IN 2
–IN 3
V+ 4
TOP VIEW
8 SHDN
7 OUT
6 REF
5 GND
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, ΘJA = 300°C/W
MSOP PINOUT ENGINEERED FOR FMEA
TOP VIEW
+IN 1
–IN 2
NC 3
V+ 4
8 SHDN
7 OUT
6 REF
5 GND
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, ΘJA = 300°C/W
V+ 1
+IN 2
–IN 3
V+ 4
TOP VIEW
8 SHDN
7 OUT
6 REF
5 GND
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, ΘJA = 190°C/W
Order Information
LEAD FREE FINISH
LT1999CMS8-10#PBF
LT1999IMS8-10#PBF
LT1999HMS8-10#PBF
LT1999MPMS8-10#PBF
LT1999CMS8-10F#PBF
LT1999IMS8-10F#PBF
LT1999HMS8-10F#PBF
LT1999MPMS8-10F#PBF
LT1999CS8-10#PBF
LT1999IS8-10#PBF
LT1999HS8-10#PBF
LT1999MPS8-10#PBF
LT1999CMS8-20#PBF
LT1999IMS8-20#PBF
LT1999HMS8-20#PBF
LT1999MPMS8-20#PBF
TAPE AND REEL
LT1999CMS8-10#TRPBF
LT1999IMS8-10#TRPBF
LT1999HMS8-10#TRPBF
LT1999MPMS8-10#TRPBF
LT1999CMS8-10F#TRPBF
LT1999IMS8-10F#TRPBF
LT1999HMS8-10F#TRPBF
LT1999MPMS8-10F#TRPBF
LT1999CS8-10#TRPBF
LT1999IS8-10#TRPBF
LT1999HS8-10#TRPBF
LT1999MPS8-10#TRPBF
LT1999CMS8-20#TRPBF
LT1999IMS8-20#TRPBF
LT1999HMS8-20#TRPBF
LT1999MPMS8-20#TRPBF
PART MARKING*
LTFPB
LTFPB
LTFPB
LTFQP
LTGVB
LTGVB
LTGVB
LTGVB
199910
199910
199910
99MP10
LTFNZ
LTFNZ
LTFNZ
LTFQQ
PACKAGE DESCRIPTION
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead MSOP FMEA Pinout
8-Lead MSOP FMEA Pinout
8-Lead MSOP FMEA Pinout
8-Lead MSOP FMEA Pinout
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
2 For more information www.linear.com/LT1999
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 150°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 150°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 150°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 150°C
1999fd


Part Number LT1999-20
Description Bidirectional Current Sense Amplifier
Maker Linear
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