V (20V/DIV)
+IN
LT1999-10/LT1999-20/
LT1999-50
High Voltage, Bidirectional
Current Sense Amplifier
Fea T Descrip T
n
Buffered Output with 3 Gain Options: The LT 1999 is a high speed precision current sense am-
10V/V, 20V/V, 50V/V plifier, designed to monitor bidirectional currents over a
n
Gain Accuracy: 0.5% Max wide common mode range. The LT1999 is offered in three
n
gain options: 10V/V, 20V/V, and 50V/V.
Input Common Mode Voltage Range: 5V to 80V
n
AC CMRR > 80dB at 100kHz
The LT1999 senses current via an external resistive shunt
n
Input Offset Voltage: 1.5mV Max
and generates an output voltage, indicating both magnitude
n
3dB Bandwidth: 2MHz
and direction of the sensed current. The output voltage is
n
Smooth, Continuous Operation Over Entire Common
referenced halfway between the supply voltage and ground,
Mode Range
or an external voltage can be used to set the reference
n
4kV HBM Tolerant and 1kV CDM Tolerant
level. With a 2MHz bandwidth and a common mode input
n
Low Power Shutdown <10A
range of 5V to 80V, the LT1999 is suitable for monitor-
n
55C to 150C Operating Temperature Range
ing currents in H-Bridge motor controls, switching power
n
8-Lead MSOP and 8-Lead SO (Narrow) Packages
supplies, solenoid currents, and battery charge currents
n
8-Lead MSOP Pinout Option Engineered for FMEA
from full charge to depletion.
The LT1999 operates from an independent 5V supply
a T
and draws 1.55mA. A shutdown mode is provided for
n minimizing power consumption.
High Side or Low Side Current Sensing
n
H-Bridge Motor Control
The LT1999 is available in an 8-lead SOP, an 8-lead MSOP
n
Solenoid Current Sense
(original pinout), or an 8-lead pinout option engineered
n
High Voltage Data Acquisition
for FMEA.
n
PWM Control Loops
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.
n
Fuse/MOSFET Monitoring
Typical a T
Full Bridge Armature Current Monitor
+
V
LT1999
V
S
5V
+
2A
V
V
OUT
1 8
SHDN
V
SHDN
2.5V
R
+ G
4k
V
+IN 2
7
R
S +
V
OUT
V +
0.8k
V
IN +
V
+IN
V
0.8k
160k
4k
3
V
6 REF
+
5V 160k
V
0.1F
1999 TA01b
4
TIME (10s/DIV)
5
0.1F
1999 TA01a
1999fd
1
For more information www.linear.com/LT1999
V (2V/DIV)
OUT
ion pplica
ions pplica
ion uresLT1999-10/LT1999-20/
LT1999-50
a T e Maxi Mu M r a T
(Note 1)
Differential Input Voltage Specified Temperature Range (Note 6)
+IN to IN (Notes 1, 3) ................................. 60V, 10ms LT1999C .................................................. 0C to 70C
+IN to GND, IN to GND (Note 2) ............. 5.25V to 88V LT1999I ................................................40C to 85C
+
Total Supply Voltage (V to GND) ................................6V LT1999H ............................................ 40C to 125C
+
Input Voltage Pins 6 and 8 ...................V + 0.3V, 0.3V LT1999MP ......................................... 55C to 150C
Output Short-Circuit Duration (Note 4) ............ Indefinite Junction Temperature ........................................... 150C
Operating Ambient Temperature (Note 5) Storage Temperature Range .................. 65C to 150C
LT1999C ..............................................40C to 85C
LT1999I ................................................40C to 85C
LT1999H ............................................ 40C to 125C
LT1999MP ......................................... 55C to 150C
p c F T
TOP VIEW
ORIGINAL MSOP PINOUT MSOP PINOUT ENGINEERED FOR FMEA
+
V
1 8 SHDN
TOP VIEW
TOP VIEW
+
+IN 2 7 OUT
V 1 8 SHDN
+IN 1 8 SHDN
+IN 2 7 OUT
IN 2 7 OUT
IN 3 6 REF
IN 3 6 REF
NC 6 REF
3
+
+
+
V 4 5 GND
V 4 5 GND
V 4 5 GND
MS8 PACKAGE
MS8 PACKAGE
S8 PACKAGE
8-LEAD PLASTIC MSOP
8-LEAD PLASTIC MSOP
8-LEAD PLASTIC SO
T = 150C, = 300C/W T = 150C, = 300C/W
JMAX JA JMAX JA
T = 150C, = 190C/W
JMAX JA
o r D i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1999CMS8-10#PBF LT1999CMS8-10#TRPBF LTFPB 8-Lead Plastic MSOP 0C to 70C
LT1999IMS8-10#PBF LT1999IMS8-10#TRPBF LTFPB 8-Lead Plastic MSOP 40C to 85C
LT1999HMS8-10#PBF LT1999HMS8-10#TRPBF LTFPB 8-Lead Plastic MSOP 40C to 125C
LT1999MPMS8-10#PBF LT1999MPMS8-10#TRPBF LTFQP 8-Lead Plastic MSOP 55C to 150C
LT1999CMS8-10F#PBF LT1999CMS8-10F#TRPBF LTGVB 8-Lead MSOP FMEA Pinout 0C to 70C
LT1999IMS8-10F#PBF LT1999IMS8-10F#TRPBF LTGVB 8-Lead MSOP FMEA Pinout 40C to 85C
LT1999HMS8-10F#PBF LT1999HMS8-10F#TRPBF LTGVB 8-Lead MSOP FMEA Pinout 40C to 125C
LT1999MPMS8-10F#PBF LT1999MPMS8-10F#TRPBF LTGVB 8-Lead MSOP FMEA Pinout 55C to 150C
LT1999CS8-10#PBF LT1999CS8-10#TRPBF 199910 8-Lead Plastic SO 0C to 70C
LT1999IS8-10#PBF LT1999IS8-10#TRPBF 199910 8-Lead Plastic SO 40C to 85C
LT1999HS8-10#PBF LT1999HS8-10#TRPBF 199910 8-Lead Plastic SO 40C to 125C
LT1999MPS8-10#PBF LT1999MPS8-10#TRPBF 99MP10 8-Lead Plastic SO 55C to 150C
LT1999CMS8-20#PBF LT1999CMS8-20#TRPBF LTFNZ 8-Lead Plastic MSOP 0C to 70C
LT1999IMS8-20#PBF LT1999IMS8-20#TRPBF LTFNZ 8-Lead Plastic MSOP 40C to 85C
LT1999HMS8-20#PBF LT1999HMS8-20#TRPBF LTFNZ 8-Lead Plastic MSOP 40C to 125C
LT1999MPMS8-20#PBF LT1999MPMS8-20#TRPBF LTFQQ 8-Lead Plastic MSOP 55C to 150C
1999fd
2
For more information www.linear.com/LT1999
ion or er
ion igura on in
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