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參數(shù)資料
| 型號(hào)： | 522978G |
| 英文描述： | IC-SWITCHING REGULATOR |
| 中文描述： | 集成電路開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 292K |
| 代理商： | 522978G |
3
LT1185
PARAMETER
External Current Limit
Programming Constant
External Current Limit Error
CONDITIONS
5k
≤
R
LIM
≤
15k, V
OUT
= 1V
(Note 10)
1A
≤
I
LIM
≤
3A
R
LIM
= 15k
×
A/I
LIM
I
OUT
= 5mV
4V
≤
V
IN
≤
25V (Note 4)
V
IN
– V
OUT
= V
SAT
(Note 9)
V
IN
– V
OUT
≥
2V
MIN
TYP
15k
MAX
UNITS
A
G
0.02 I
LIM
0.04 I
LIM
2.5
0.06 I
LIM
+ 0.03
0.09 I
LIM
+ 0.05
3.5
A
A
G
Quiescent Supply Current
G
mA
Supply Current Change with Load
G
G
25
10
2
40
25
7
mA/A
mA/A
REF Pin Shutoff Current
Thermal Regulation (See Applications
Information)
Reference Voltage Temperature Coefficient
Thermal Resistance Junction to Case
G
0.4
μ
A
V
IN
– V
OUT
= 10V
I
OUT
= 5mA to 2A
(Note 7)
TO-3 Control Area
Power Transistor
TO-220 Control Area
Power Transistor
0.005
0.014
%/W
0.003
0.01
1
3
1
3
%/
°
C
°
C/W
°
C/W
°
C/W
°
C/W
ELECTRICAL CHARACTERISTICS
Adjustable Version, V
IN
= 7.4V, V
OUT
= V
REF
, I
OUT
= 1mA, R
LIM
= 4.02k, unless otherwise noted.
The
G
denotes specifications which apply over the full operating
temperature range.
Note 1:
Reference voltage is guaranteed both at nominal conditions (no
load, 25
°
C) and at worst case conditions of load, line, power and
temperature. An intermediate value can be calculated by adding the effects
of these variables in the actual application. See the Applications
Information section of this data sheet.
Note 2:
Dropout voltage is tested by reducing input voltage until the
output drops 1% below its nominal value. Tests are done at 0.5A and 3A.
The power transistor looks basically like a pure resistance in this range so
that minimum differential at any intermediate current can be calculated by
interpolation; V
DROPOUT
= 0.25V + 0.25
×
I
OUT
. For load current less than
0.5A, see graph.
Note 3:
“Minimum input voltage” is limited by base emitter voltage drive
of the power transistor section, not saturation as measured in Note 2. For
output voltages below 4V, “minimum input voltage” specification may limit
dropout voltage before transistor saturation limitation.
Note 4:
Supply current is measured on the ground pin, and does not
include load current, R
LIM
, or output divider current.
Note 5:
The 25W power level is guaranteed for an input-output voltage of
8.3V to 17V. At lower voltages the 3A limit applies, and at higher voltages
the internal power limiting may restrict regulator power below 25W. See
graphs.
Note 6:
Line and load regulation are measured on a pulse basis with a
pulse width of
≈
2ms, to minimize heating. DC regulation will be affected
by thermal regulation and temperature coefficient of the reference. See
Application Section for details.
Note 7:
Guaranteed by design and correlation to other tests, but not
tested.
Note 8:
T
JMIN
= 0
°
C for the LT1185C, –40
°
C for LT1185I, and –55
°
C for
the LT1185M. Power transistor area and control circuit area have different
maximum junction temperatures. Control area limits are T
JMAX
= 125
°
C for
the LT1185C and LT1185I and 150
°
C for the LT1185M. Power area limits
are 150
°
C for LT1185C and LT1185I and 175
°
C for LT1185M.
Note 9:
V
SAT
is the maximum specified dropout voltage; 0.25V + 0.25
×
I
OUT
.
Note 10:
Current limit is programmed with a resistor from REF pin to GND
pin. The value is 15k/I
LIM
.
Note 11:
For V
IN
– V
OUT
= 1.5V; V
IN
= 5V, V
OUT
= 3.5V. V
OUT
= 1V for all
other current limit tests.
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| 522979E | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC |
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| 522983B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC |
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