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參數資料
| 型號： | 522978G |
| 英文描述： | IC-SWITCHING REGULATOR |
| 中文描述： | 集成電路開關穩壓器 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 292K |
| 代理商： | 522978G |
1
LT1185
S
FEATURE
Low Dropout Regulator
I
Low Resistance Pass Transistor: 0.25
I
Dropout Voltage: 0.75V at 3A
I
±
1% Reference Voltage
I
Accurate
Programmable Current Limit
I
Shutdown Capability
I
Internal Reference Available
I
Standard 5-Lead Packages
I
Full Remote Sense
I
Low Quiescent Current:
≈
2.5mA
I
Good High Frequency Ripple Rejection
D
The LT1185 is a 3A low dropout regulator with adjustable
current limit and remote sense capability. It can be used as
a positive output regulator with floating input or as a
standard negative regulator with grounded input. The
output voltage range is 2.5V to 25V, with
±
1% accuracy on
the internal reference voltage.
U
ESCRIPTIO
The LT1185 uses a saturation-limited NPN transistor as
the pass element. This device gives the linear dropout
characteristics of an FET pass element with significantly
less die area. High efficiency is maintained by using special
anti-saturation circuitry that adjusts base drive to track
load current. The “on resistance” is typically 0.25
.
Accurate current limit is programmed with a single 1/8W
external resistor, with a range of zero to three amperes. A
second, fixed internal limit circuit prevents destructive
currents if the programming current is accidentally over-
ranged. Shutdown of the regulator output is guaranteed
when the program current is less than 1
μ
A, allowing
external logic control of output voltage.
The LT1185 has all the protection features of previous LTC
regulators, including power limiting and thermal shut-
down. The 4-lead TO-3 package is specified for –55
°
C to
150
°
C operation and the 5-lead TO-220 is specified over
0
°
C to 125
°
C.
U
A
O
PPLICATI
TYPICAL
5V, 3A Regulator with 3.5A Current Limit
Dropout Voltage
+
–
R1
2.37k
R2
2.67k
+
C1
2
μ
F
TANT
REF
GND
FB
V
OUT
V
OUT
LT1185
+
C2
2
μ
F
TANT
R
*
4.3k
+
–
V
6V TO 16V
V
5V AT 3A
LT1185 TA01
*CURRENT LIMIT = 15k/R
LIM
= 3.5A
LOAD CURRENT (A)
0
V
I
O
0.8
1.0
1.2
4
LT1185 TA02
0.6
0.4
0
1
2
3
0.2
1.6
1.4
T
J
= 125°C
T
J
= –55°C
T
J
= 25°C
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