LT1620IS8#TR Linear Technology, LT1620IS8#TR Datasheet

IC AMP CURRENT SENSE R-R 8SOIC

LT1620IS8#TR

Manufacturer Part Number
LT1620IS8#TR
Description
IC AMP CURRENT SENSE R-R 8SOIC
Manufacturer
Linear Technology
Datasheets

Specifications of LT1620IS8#TR

Amplifier Type
Current Sense
Number Of Circuits
1
Output Type
Rail-to-Rail
Current - Input Bias
20nA
Voltage - Input Offset
6000µV
Current - Supply
2.3mA
Voltage - Supply, Single/dual (±)
4.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Output / Channel
-
-3db Bandwidth
-
Slew Rate
-
Gain Bandwidth Product
-

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FEATURE
A
SIMPLIFIED SCHEMATIC. SEE FIGURE 2 FOR COMPLETE SCHEMATIC
TYPICAL
PPLICATI
High Current Battery Chargers
High Output Voltage DC/DC Converters
Constant Current Sources
Overcurrent Fault Protectors
Accurate Output Current Programming
Usable in Charging Applications Up to 32V Output
Programmable Load Current Monitor for End-of-
Charging-Cycle Notification (16-Pin Version)
Dual Function IC (LT1621) Allows Convenient
Integration of Load and Input Current Sensing
Level-Shifted Current Sense Output for Current Mode
PWM Controllers
Can be Used for NiCd, NiMH, Lead-Acid and Lithium-
Ion Battery Charging
Greater than 96% Efficiency Possible in Charger
Applications
High Output Currents Possible: > 10A
Easily Obtained
2
1
3
4
GND
I
SENSE
IN
OUT
LT1620MS8
Figure 1. Low Dropout, High Current Li-Ion Battery Charger
6
V
CC
PROG
AVG
S
A
0.1 F
IN
+
O
PPLICATI
7
5
8
U
S
3k
1%
15.75k
1%
SYNCHRONOUS
I
SENSE
INTV
O
TH
0.1 F
REGULATOR
LTC1435
CC
BUCK
U
V
SW
FB
IN
(V
27 H
BATT
+ 0.5V) TO 32V
+
0.025
22 F
35V
2
LT1620/21 • F01
D
The LT
controlled current battery charging circuits when used in
conjunction with a current mode PWM controller IC.
The LT1620 regulates average output current independent
of input and output voltage variations. Output current can
be easily adjusted via a programming voltage applied to
the LT1620’s PROG pin.
Most current mode PWM controllers have limited output
voltage range because of common mode limitations on the
current sense inputs. The LT1620 overcomes this restric-
tion by providing a level-shifted current sense signal,
allowing a 0V to 32V output voltage range.
The 16-pin version of the LT1620 contains a program-
mable low charging current flag output. This output flag
can be used to signal when a Li-Ion battery charging cycle
is nearing completion.
The LT1621 incorporates two fully independent current
control circuits for dual loop applications.
1.43M
0.1%
110k
0.1%
V
, LTC and LT are registered trademarks of Linear Technology Corporation.
IN
ESCRIPTIO
I
BATT
+
TO 4A
®
1620 simplifies the design of high performance,
22 F
35V
V
BATT
Rail-to-Rail Current
U
100
Sense Amplifier
95
90
85
80
75
0
V
IN
LT1620/LT1621
= 24V
BATTERY CHARGE CURRENT (A)
1
Efficiency
2
V
V
V
3
BATT
BATT
BATT
= 16V
= 12V
= 6V
4
1620/21 • TA02
1
5

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LT1620IS8#TR Summary of contents

Page 1

... This output flag can be used to signal when a Li-Ion battery charging cycle is nearing completion. The LT1621 incorporates two fully independent current control circuits for dual loop applications. , LTC and LT are registered trademarks of Linear Technology Corporation 0.5V) TO 32V BATT V ...

Page 2

LT1620/LT1621 BSOLUTE Power Supply Voltage: V ..........................– 0. Programming Voltage: PROG, PROG2 ............ – 0. SENSE, AVG, AVG2, OUT MODE Voltage ................ – 0. ...

Page 3

ELECTRICAL C HARA TERISTICS 16. unless otherwise noted. CC IOUT A SYMBOL PARAMETER Current Sense Amplifier V Input Offset - Measured at 10 Output OSAVG (V ...

Page 4

LT1620/LT1621 CTIO S input (across external sense resistor) equal )/10. Input voltage range is V PROG AVG2: Sense Amplifier A = – 20 Output and Comparator V Positive Input. Used as integration ...

Page 5

U OPERATION (Refer to the Functional Block Diagram) used as integration nodes to facilitate averaging of the current sense amplifier signal. (Note: filter capacitors on these pins should bypass to the these signals enables direct sensing and ...

Page 6

LT1620/LT1621 U U APPLICATIONS INFORMATION RUN C13 0.033 F X7R R1 C14 1k 1nF C17, 0. – GND CC C18 LT1620MS8 0 PROG OUT 8 1 AVG ...

Page 7

U U APPLICATIONS INFORMATION + – between the IN and IN inputs. Effective decoupling of supply rails is also imperative in these types of circuits, as large current transients are the norm. Power supply decoupling should be placed as close ...

Page 8

LT1620/LT1621 U U APPLICATIONS INFORMATION reduces battery charging current until the external load subsides. In Figure 4 the LT1620 is coupled with an LT1513 SEPIC battery charger IC to create an input overcurrent protected charger circuit. The programming voltage (V ...

Page 9

U U APPLICATIONS INFORMATION 80mV 16. –10 –20 –30 – 100 150 I SINK CURRENT ( A) OUT Figure 5a. Typical Setpoint Voltage ...

Page 10

LT1620/LT1621 U TYPICAL APPLICATIONS 6V TO 28V LT1121CS8 OUT SHDN GND 5 0.1 F SHUTDOWN 6V TO 15V + 4. 25V TPS 10k 5V 0.1 F 2N7002 10 Programmable Constant Current Source D45VH10 0.1 470 1 ...

Page 11

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... Operation and Prevents Wall-Adapter Overload 5V Standby in Shutdown, V Constant Frequency 5V Standby in Shutdown, V Constant Frequency PROTECTED FAULT 1N4148 100k 33k LT1620/21 • TA03 36V, Programmable IN 36V, Programmable IN 36V, Programmable IN 36V, Programmable IN 36V, Programmable IN 16201f LT/GP 0197 7K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1996 ...

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