LTC6104 LINER [Linear Technology], LTC6104 Datasheet

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LTC6104

Manufacturer Part Number
LTC6104
Description
High Voltage, High Side, Bi-Directional Current Sense Amplifi er
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
APPLICATIONS
TYPICAL APPLICATION
All other trademarks are the property of their respective owners.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Wide Supply Range: 4V to 60V with 70V Absolute
Maximum
Low Offset Voltage: ±450µV Maximum
Fast Response: 1µs Response Time
Gain Confi gurable with External Resistors; Each
Direction is Gain Confi gurable
Low Input Bias Current: 170nA Maximum
PSRR: 110dB Minimum
Output Current: ±1mA Maximum
Low Supply Current: 520µA, V
Specifi ed for –40°C to 125°C Temperature Range
Available in an 8-Lead MSOP Package
Current Shunt Measurement
Battery Monitoring
Remote Sensing
Power Management
CHARGER/LOAD
TO
LTC6104
V
S
I
+ –
16-Bit Resolution Bi-Directional Output into LTC1286 ADC
LOAD
8
OUT
+INA
A
1
7
R
2.5k
CURRENT
MIRROR
–INA
V
R
OUT
R
100Ω
SENSE
SENSE
IN
6
+
–INB
R
100Ω
IN
4
V
S
B
5
+
= 12V
+INB
V
S
+
12V
V
REF
0.1µF
C2
R1
2.3k
LT
®
1004-2.5
+IN
–IN
DESCRIPTION
The LTC
directional current sense amplifi er. Design fl exibility is
provided by the excellent device characteristics: ±450µV
maximum offset and only 520µA of current consumption
(typical at 12V). The LTC6104 operates on supplies from
4V to 60V.
The LTC6104 monitors bi-directional current via the voltage
across an external sense resistor (shunt resistor). This
sense voltage is then translated into a ground referenced
signal. Gain is set with three external resistors and can
be separately confi gured for both directions. Low DC
offset allows the use of a small shunt resistor and large
gain-setting resistors. As a result, power loss in the shunt
is minimal.
The wide operating supply range and high accuracy make
the LTC6104 ideal for a wide variety of automotive, industrial
and power management applications. A maximum input
sense voltage of 500mV allows a wide range of currents
to be monitored. The fast response makes the LTC6104
the perfect choice for load current warnings and shutoff
protection control. With very low supply current, the
LTC6104 is suitable for power sensitive applications.
The LTC6104 is available in an 8-lead MSOP package.
V
REF
LTC1286
GND
V
High Voltage, High Side,
CC
1µF
C1
®
6104 TA01a
D
6104 is a versatile, high voltage, high side, bi-
CLK
OUT
CS
Bi-Directional Current
+
5V
TO µP
Sense Amplifi er
1.5V
6V
1V
V
I
SENSE
OUT
I
OUT
V
= 100µA
OUT
= 0µA
Step Response
TIME (1µs/DIV)
LTC6104
∆V
SENSE
= 100mV
T
V
R
R
V
V
A
S
IN
OUT
SENSE
REF
= 25°C
= 12V
= 100Ω
= 1V
= 5k
+
= V
6104 G15
S
1
6104f

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LTC6104 Summary of contents

Page 1

... As a result, power loss in the shunt is minimal. The wide operating supply range and high accuracy make the LTC6104 ideal for a wide variety of automotive, industrial and power management applications. A maximum input sense voltage of 500mV allows a wide range of currents to be monitored. The fast response makes the LTC6104 the perfect choice for load current warnings and shutoff protection control ...

Page 2

... LTC6104C ............................................ –40°C to 85°C LTC6104I ............................................. –40°C to 85°C LTC6104H .......................................... –40°C to 125°C Specifi ed Temperature Range (Note 2) LTC6104C ................................................ 0°C to 70°C LTC6104I ............................................. –40°C to 85°C LTC6104H .......................................... –40°C to 125°C Storage Temperature Range ................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300° ...

Page 3

... Note 4: When amplifi active and amplifi inactive, the gain error is entirely due to the external resistors inactive and amplifi active, there is an additional gain error from the LTC6104 current mirror circuit. This error term is the gain error term, I plus the offset error term, I ...

Page 4

... LTC6104 TYPICAL PERFORMANCE CHARACTERISTICS Input V vs Temperature OS 100 TWO REPRESENTATIVE UNITS 100Ω – OUT – 5mV INTERNAL OS –60 AMPLIFIER INTERNAL –80 OS AMPLIFIER B –100 –40 – 100 120 40 TEMPERATURE (°C) 6104 G01 V Maximum vs Temperature ...

Page 5

... T = 25° 12V 100Ω 1.5V OUT + SENSE 4.5V REF TIME (1µs/DIV) 6104 G17 LTC6104 Step Response –5mV to 5mV V + 5mV S – V SENSE V – 5mV S 2.25V 2V = 25° 25° 12V V = 12V S = 100Ω 100Ω OUT ...

Page 6

... LTC6104 TYPICAL PERFORMANCE CHARACTERISTICS Step Response Falling Edge – V SENSE – ∆V = 100mV SENSE I = 0µA OUT 6V 5. –100µA OUT T = 25° 12V S = 100Ω OUT OUT + SENSE S 0. REF TIME (1µs/DIV) 6104 G19 PIN FUNCTIONS OUT (Pin 1): Current Output ...

Page 7

... OUT to a reference voltage (V output voltage is then OUT SENSE When operating on a dual supply, R OUT The output voltage is then OUT Only one amplifi active at a time in the LTC6104. If the load current direction (V is negative) activates the SENSE V – SENSE + R SENSE ...

Page 8

... Note that input dynamic range is the difference between the maximum input signal and the minimum accurately reproduced signal, and is limited primarily by input DC offset of the internal amplifi the LTC6104. In addition, R must be small enough that V SENSE the maximum input voltage specifi ...

Page 9

... R OUT output voltage range does not exceed the LTC6104 maxi- mum output voltage range (see Electrical Characteristics). If the following circuit is a buffer or ADC with limited input range, then R can be increased allowed maximum input range of this circuit ...

Page 10

... LTC6104 APPLICATIONS INFORMATION From the Electrical Characteristics of the LTC6104, the output voltage range is 0.3V to 8V. If the circuit that is driven by the output limits the maxi- mum output voltage to ≈5V, to achieve maximum dynamic range, V should be 0.3V for –1mA I OUT 1mA I . OUT 5 V – ...

Page 11

... SENSE Figure 4. Output Error vs Input Voltage , is limited to 1mA, Output Error, E The LTC6104 uses the +INB pin for both the positive “B” amplifi er input and the positive supply input for both amplifi ers. If trace resistance ( • 100nA = (Figure 5), this supply current can cause an input offset ...

Page 12

... JA expected die temperature. This must not be allowed to exceed 150°C, or performance may be degraded example LTC6104 in the MS8 package run at 55V ±5V supply with 1mA output current at 80° • V (MAX) = 1.2mA • ...

Page 13

... V Keep this in mind when choosing an output resistor and voltage reference. In addition, if the output of the LTC6104 is wired to a device that will effectively short it to high voltage (such as through an ESD protection clamp) during a reverse sup- ply condition, the LTC6104’ ...

Page 14

... LTC6104 2 4 PWM 6104 TA02 *USE “SIGN-MAGNITUDE” PWM FOR ACCURATE LOAD CURRENT CONTROL AND MEASUREMENT R SHUNTB R INB BATTERY R SHUNTA R INA CURRENT MIRROR LTC6104 V REF 6104 F08 Figure 8 0.1µF 1µF 6 4.99k 2.5V ±2V (±10A FS 6104f ...

Page 15

... TYP 0.53 ± 0.152 1.10 (.021 ± .006) (.043) DETAIL “A” MAX SEATING PLANE 0.22 – 0.38 (.009 – .015) 0.65 TYP (.0256) BSC LTC6104 0.52 (.0205 REF 3.00 ± 0.102 (.118 ± .004) (NOTE 0.86 (.034) REF 0.127 ± 0.076 (.005 ± ...

Page 16

... LTC6104 TYPICAL APPLICATION LTC6104 Bi-Directional Current Sense Circuit with Combined Charge/Discharge Output CHARGER I LOAD RELATED PARTS PART NUMBER DESCRIPTION LT1636 Rail-to-Rail Input/Output, Micropower Op Amp LT1637/LT1638 Single/Dual/Quad, Rail-to-Rail, Micropower Op Amp LT1639 LT1787/LT1787HV Precision, Bidirectional, High Side Current Sense Amplifi er 2.7V to 60V Operation, 75µV Offset, 60µA Current Draw LTC1921 Dual – ...

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