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LT1620IGN Datasheet

  • LT1620IGN

  • Rail-to-Rail Current Sense Amplifier

  • 286.45KB

  • 12頁

  • LINER

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LT1620/LT1621
Rail-to-Rail Current
Sense Amplifier
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
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
The LT
廬
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鈥檚 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.
APPLICATI
s
s
s
s
S
High Current Battery Chargers
High Output Voltage DC/DC Converters
Constant Current Sources
Overcurrent Fault Protectors
TYPICAL APPLICATI
(V
BATT
+ 0.5V) TO 32V
V
IN
LTC1435
SYNCHRONOUS
BUCK
REGULATOR
I
TH
SENSE
鈥?/div>
+
V
IN
22碌F
35V
脳
2
I
BATT
TO 4A
V
BATT
1.43M
0.1%
SW
27碌H
FB
110k
0.1%
0.025鈩?/div>
INTV
CC
0.1碌F
6
V
CC
1
8
SENSE
AVG
2
7
I
OUT
PROG
LT1620MS8
3
GND
4
5
IN
鈥?/div>
IN
+
0.1碌F
3k
1%
15.75k
1%
22碌F
35V
EFFICIENCY (%)
+
LT1620/21 鈥?F01
SIMPLIFIED SCHEMATIC. SEE FIGURE 2 FOR COMPLETE SCHEMATIC
Figure 1. Low Dropout, High Current Li-Ion Battery Charger
U
Efficiency
100
V
IN
= 24V
V
BATT
= 16V
95
V
BATT
= 12V
90
V
BATT
= 6V
85
80
75
0
1
3
4
2
BATTERY CHARGE CURRENT (A)
5
1620/21 鈥?TA02
UO
UO
1

LT1620IGN 產品屬性

  • 100

  • 集成電路 (IC)

  • Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps

  • -

  • 電流檢測

  • 1

  • 滿擺幅

  • -

  • -

  • -

  • 20nA

  • 6000µV

  • 2.8mA

  • -

  • 4.5 V ~ 5.5 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 16-SSOP（0.154"，3.90mm 寬）

  • 16-SSOP

  • 管件

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