900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LT1621 Datasheet

Rail-to-Rail Current Sense Amplifier

No Preview Available !

LT1620/LT1621
Rail-to-Rail Current
Sense Amplifier
FEATURES
s Accurate Output Current Programming
s Usable in Charging Applications Up to 32V Output
s Programmable Load Current Monitor for End-of-
Charging-Cycle Notification (16-Pin Version)
s Dual Function IC (LT1621) Allows Convenient
Integration of Load and Input Current Sensing
s Level-Shifted Current Sense Output for Current Mode
PWM Controllers
s Can be Used for NiCd, NiMH, Lead-Acid and Lithium-
Ion Battery Charging
s Greater than 96% Efficiency Possible in Charger
Applications
s High Output Currents Possible: > 10A
Easily Obtained
APPLICATI S
s High Current Battery Chargers
s High Output Voltage DC/DC Converters
s Constant Current Sources
s Overcurrent Fault Protectors
DESCRIPTIO
The LT ®1620 simplifies the design of high performance,
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
VIN
LTC1435
SYNCHRONOUS
BUCK
REGULATOR
(VBATT + 0.5V) TO 32V
+ 22µF
35V
×2
VIN
IBATT TO 4A
6 0.1µF
1
VCC
SENSE
AVG
8
2 IOUT
PROG 7
LT1620MS8
3
GND
4 IN
IN+ 5
ITH SW
SENSE
27µH 0.025
INTVCC
FB
0.1µF
3k
1%
15.75k
1%
1.43M
0.1%
+
110k
0.1%
22µF
35V
SIMPLIFIED SCHEMATIC. SEE FIGURE 2 FOR COMPLETE SCHEMATIC
LT1620/21 • F01
Figure 1. Low Dropout, High Current Li-Ion Battery Charger
VBATT
100
VIN = 24V
95
90
85
Efficiency
VBATT = 16V
VBATT = 12V
VBATT = 6V
80
75
0
1 2 34
BATTERY CHARGE CURRENT (A)
5
1620/21 • TA02
1


Linear Technology Electronic Components Datasheet

LT1621 Datasheet

Rail-to-Rail Current Sense Amplifier

No Preview Available !

LT1620/LT1621
ABSOLUTE AXI U RATI GS (Referenced to Ground) (Note 1)
Power Supply Voltage: VCC ..........................– 0.3V to 7V
Programming Voltage:
PROG, PROG2 ............ – 0.3V to VCC + 0.3V (7V Max)
IOUT, SENSE, AVG, AVG2,
MODE Voltage ................ – 0.3V to VCC + 0.3V (7V Max)
Sense Amplifier Input Common Mode .......– 0.3V to 36V
Operating Ambient Temperature Range
Commercial ............................................ 0°C to 70°C
Industrial ............................................ – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SENSE 1
IOUT 2
GND 3
IN4
8 AVG
7 PROG
6 VCC
5 IN+
MS8 PACKAGE
8-LEAD PLASTIC MSOP
S8 PACKAGE
8-LEAD PLASTIC SO
θJA = 250°C/W (MS)
θJA = 120°C/W (S)
ORDER PART NUMBER
LT1620CS8
LT1620IS8
LT1620CMS8
MS8 PART MARKING
BC
Consult factory for Military grade parts.
TOP VIEW
SENSE 1
NC 2
IOUT 3
NC 4
GND 5
MODE 6
NC 7
IN8
16 AVG
15 NC
14 PROG
13 PROG2
12 AVG2
11 VCC
10 NC
9 IN+
GN PACKAGE
16-LEAD PLASTIC SSOP
θJA = 149°C/ W
ORDER PART NUMBER
LT1620CGN
LT1620IGN
TOP VIEW
PROG A 1
AVG A 2
SENSE A 3
IOUT A 4
GND B 5
INB 6
IN+ B 7
VCC B 8
16 VCC A
15 IN+ A
14 INA
13 GND A
12 IOUT B
11 SENSE B
10 AVG B
9 PROG B
GN PACKAGE
16-LEAD PLASTIC SSOP
θJA = 149°C/ W
ORDER PART NUMBER
LT1621CGN
LT1621IGN
ELECTRICAL CHARACTERISTICS
VIN+ = 16.8V, VCC = 5V, VIOUT = 2V, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
Supply
VCC 5V Supply Voltage
ICC DC Active Supply Current
LT1620GN
SENSE = AVG = PROG = PROG2 = VCC
4.5V VCC 5.5V, IN+ – IN= 100mV
DC Active Supply Current
SENSE = AVG = PROG = VCC
LT1620S8, LT1620MS8, 1/2 LT1621GN 4.5V VCC 5.5V, IN+ – IN= 100mV
DC Active Supply Current
SENSE = AVG = PROG = VCC
LT1620S8, LT1620MS8, 1/2 LT1621GN 4.5V VCC 5.5V, IN+ – IN= 0mV
Current Sense Amplifier
VCM Input Common Mode Range
VID Differential Input Voltage Range
(IN+ – IN)
0V VCM 32V
VOSSENSE Input Offset - Measured at ×1 Output
(VSENSE)
VCC VCM 32V
VID = 80mV
MIN TYP MAX UNITS
q 4.5 5.0 5.5
2.8 3.8
q 4.0
2.3 3.3
q 3.7
1.3 1.9
q 2.1
V
mA
mA
mA
mA
mA
mA
q0
q0
–5
q –6
32 V
125 mV
5 mV
6 mV
2


Part Number LT1621
Description Rail-to-Rail Current Sense Amplifier
Maker Linear Technology
PDF Download

LT1621 Datasheet PDF





Similar Datasheet

1 LT1620 Rail-to-Rail Current Sense Amplifier
Linear Technology
2 LT1621 Rail-to-Rail Current Sense Amplifier
Linear Technology





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy