Datasheet Linear Technology LT1970

Manufacturer	Linear Technology
Series	LT1970

500mA Power Op Amp with Adjustable Precision Current Limit

Datasheets

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PDF, 402 Kb, Language: en, File uploaded: Aug 6, 2017, Pages: 26
500mA Power Op Amp with Adjustable Precision Current Limit

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Packaging

	LT1970CFE#PBF	LT1970CFE#TRPBF	LT1970IFE#PBF	LT1970IFE#TRPBF
N	1	2	3	4
Package	TSSOP-20 Package Outline Drawing	TSSOP-20 Package Outline Drawing	TSSOP-20 Package Outline Drawing	TSSOP-20 Package Outline Drawing
Package Code	FE	FE	FE	FE
Package Index	05-08-1663 (CA)	05-08-1663 (CA)	05-08-1663 (CA)	05-08-1663 (CA)
Pin Count	20	20	20	20

Parametrics

Parameters / Models	LT1970CFE#PBF	LT1970CFE#TRPBF	LT1970IFE#PBF	LT1970IFE#TRPBF
Av Min Stable, V/V	1	1	1	1
Avol, dB	44	44	44	44
Common Mode Rejection Ratio, dB	105	105	105	105
Number of Channels	1	1	1	1
Cload, pF	10000	10000	10000	10000
Design Tools	LTspice Model	LTspice Model	LTspice Model	LTspice Model
Enoise Density, nV/rtHz	15	15	15	15
Export Control	no	no	no	no
GBW, MHz	3.6	3.6	3.6	3.6
Ibias, nA	160	160	160	160
Inoise, pA/rtHz	3	3	3	3
Ios, µA	0.1	0.1	0.1	0.1
Iout, mA	800	800	800	800
Isupply, mA	7	7	7	7
LF Enoise, µVPP	3	3	3	3
Operating Temperature Range, °C	0 to 70	0 to 70	-40 to 85	-40 to 85
Over-the-Top	no	no	no	no
PSRR, dB	130	130	130	130
Rail-to-Rail In	no	no	no	no
Rail-to-Rail Out	no	no	no	no
SR, V/µs	1.6	1.6	1.6	1.6
Shutdown	no	no	no	no
Single Supply	no	no	no	no
Ts (0.1%), ns	8000	8000	8000	8000
Type	VFB	VFB	VFB	VFB
VinCM High (from V+), V	1.4	1.4	1.4	1.4
VinCM Low (from V-), V	0.5	0.5	0.5	0.5
Voh (from V+), V	1.7	1.7	1.7	1.7
Vol (from V-), V	1.9	1.9	1.9	1.9
Vos, mV	0.2	0.2	0.2	0.2
Vos TC, µV/C	4	4	4	4
Vs Max, V	36	36	36	36
Vs Min, V	5	5	5	5

Eco Plan

	LT1970CFE#PBF	LT1970CFE#TRPBF	LT1970IFE#PBF	LT1970IFE#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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The LT1970 Op Amp Provides On-The-Fly Adjustable Current Limit for Flexibility and Load Protection in High Current Applications &mdash DN298
PDF, 88 Kb, File published: Oct 3, 2002
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Power Op Amp Provides On-the-Fly
Adjustable Current Limit for Flexibility and Load Protection
in High Current Applications
Design Note 298 Tim Regan
Introduction
Many power operational ampliп¬Ѓers offer a built-in
current limit where the limit is п¬Ѓxed or programmable
through an external resistor. This offers the most basic
measure of protection for the load circuitry, and the
ampliп¬Ѓer itself, under fault conditions. Sometimes,
though, there is a need for on-the-п¬‚y current limiting to
satisfy the requirements of different loads. For example,
automatic test equipment (ATE) systems use multiple
pin drivers to deliver test voltages across a wide range
of loads, including faults, to a unit or board to test for
continuity or functionality. To protect the load circuitry,
the ATE must precisely control the maximum current
delivered to each pin. Ideally the maximum current can
be controlled on the п¬‚y, to accommodate the different
loads at each pin. output current anywhere from 4mA to 500mA. Even
at 500mA, the accuracy of the output current limit is
guaranteed to a tight 2% (10mA) tolerance. The output
current is continuously sensed by a small valued resistor, RS, connected in series with the load as shown in …

Articles

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Power Op Amp Protects Load Circuitry with Precise Current Limiting &mdash LT Journal
PDF, 241 Kb, File published: Aug 9, 2004
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LINEAR TECHNOLOGY
VOLUME XII NUMBER 3 AUGUST 2002 IN THIS ISSUEвЂ¦
COVER ARTICLE
Power Op Amp Protects Load Circuitry
with Precise Current Limiting . 1
Tim Regan Power Op Amp Protects
Load Circuitry with
Precise Current Limiting Issue Highlights . 2
LTCВ® in the News . 2
DESIGN FEATURES
60V/3A Step-Down DC/DC Converter
Maintains High Efficiency over a Wide
Range of Input Voltages . 7
Mark W. Marosek New Power for EthernetвЂ”The
LTC4255 Delivers (Part 1 of a 3-Part
Series) . 9
Dave Dwelley High Speed Low Noise Op Amp Family
Challenges Power and Distortion
Assumptions with Rail-to-Rail Inputs
and Output . 12
John Wright and Glen Brisbois Simplify Telecom Power Supply
Monitoring with the LTC1921
Integrated Dual вЂ“48V Supply and …
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A Linear Thermoelectric Cooler Temperature Controller for Fiber Optic Lasers &mdash LT Journal
PDF, 197 Kb, File published: Mar 1, 2001
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DESIGN IDEAS A Linear Thermoelectric Cooler
Temperature Controller for
Fiber Optic Lasers
by Jim Williams
usually included in the laser module
by the laser manufacturer.
In most cases the switching based
approach is preferable to maintain
high efficiency. Occasionally a linear
controller is desirable because it eliminates inductors and saves space. A
trade off in the linear approach is
heat dissipation, which makes it useful in applications where space is
premium, and the extra heat is manageable.
Figure 1 shows the linear controller. The LTC2053 chopper stabilized
instrumentation amplifier extracts an
error signal from a bridge network.
One bridge leg is a thermistor temperature sensor located within the
laser module. The amplifier provides An article in an earlier issue of this
magazine described a switched mode
temperature controller for fiber optic
lasers.1 This previous effort combined
high efficiency switching regulator
characteristics with precision, closed …

Model Line

Series: LT1970 (4)

LT1970CFE#PBF LT1970CFE#TRPBF LT1970IFE#PBF LT1970IFE#TRPBF

Manufacturer's Classification

Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > High Output Current Amplifiers (>100mA) | High Voltage Amplifiers (>12V)