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參數(shù)資料
| 型號(hào)： | LT1572CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 100kHz, 1.25A Switching Regulator with Catch Diode |
| 中文描述： | 1.25 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁(yè)數(shù)： | 2/12頁(yè) |
| 文件大?。?/td> | 257K |
| 代理商： | LT1572CS |
2
LT1572
A
BSOLUTE
Supply Voltage (Note 4).......................................... 40V
Switch Output Voltage (Note 4).............................. 60V
Feedback Pin Voltage (Transient, 1ms) ................
±
15V
Operating Junction Temperature Range
Operating.............................................. 0
°
C to 100
°
C
Short Circuit ......................................... 0
°
C to 125
°
C
Storage Temperature Range............... –65
°
C to 150
°
C
Lead Temperature (Soldering, 10 sec)................. 300
°
C
DIODE
Average Forward Current.......................................... 1A
Peak Repetitive Forward Current .............................. 2A
Peak Non-Repetitive Forward Current....................... 3A
Peak Repetitive Reverse Voltage............................. 20V
Continuous (Average) Reverse Voltage .................. 15V
Operating Junction Temperature ......................... 125
°
C
U
G
W
A
W
U
W
A
R
XI
TI
S
U
PACKAGE/ORDER U
Note 1:
Minimum effective switch “on” time for the LT1572 (in current
limit only) is
≈
0.6
μ
s. This limits the maximum safe input voltage during
an output shorted condition. Buck mode and inverting mode input voltage
during an output shorted condition is limited to:
R
×
I
L
+ V
f
V
IN
(max, output shorted) = 15V +
buck and inverting mode
R = Inductor DC resistance
I
L
= 2.5A
V
f
= Output catch diode forward voltage at I
L
t = 0.6
μ
s, f = 100kHz switching frequency
ORDER PART
NUMBER
LT1572CS
t
×
f
Maximum input voltage can be increased by increasing R or V
f
.
External current limiting such as that shown in AN19, Figure 39, will
provide protection up to the full supply voltage rating. C1 in Figure 39
should be reduced to 200pF.
Transformer designs will tolerate much higher input voltages because
leakage inductance limits rate of rise of current in the switch. These
designs must be evaluated individually to assure that current limit is well
controlled up to maximum input voltage.
Boost mode designs are never protected against output shorts because
the external catch diode and inductor connect input to output.
ELECTRICAL C
HARA TERISTICS
V
IN
= 15V, V
C
= 0.5V, V
FB
= V
REF
, output pin open, unless otherwise noted.
SYMBOL
V
REF
PARAMETER
Reference Voltage
CONDITIONS
Measured at Feedback Pin
V
C
= 0.8V
V
FB
= V
REF
MIN
1.224
1.214
TYP
1.244
1.244
350
MAX
1.264
1.274
750
1100
6000
7000
350
400
2.30
0.52
0.03
UNITS
V
V
G
I
B
Feedback Input Current
nA
nA
G
g
m
Error Amplifier
Transconductance
Error Amplifier Source or
Sink Current
Error Amplifier Clamp
Voltage
Reference Voltage Line
Regulation
Error Amplifier Voltage Gain
Minimum Input Voltage (Note 3)
Supply Current
I
C
=
±
25
μ
A
3000
2400
150
120
1.80
0.25
4400
μ
mho
μ
mho
G
V
C
= 1.5V
200
μ
A
μ
A
G
Hi Clamp, V
FB
= 1V
Lo Clamp, V
FB
= 1.5V
3V
≤
V
IN
≤
40V
V
C
= 0.8V
0.9V
≤
V
C
≤
1.4V
V
V
0.38
G
%/V
A
V
500
800
2.6
6
V/V
G
3.0
9
V
I
Q
3V
≤
V
IN
≤
40V, V
C
= 0.6V
mA
Consult factory for Industrial and Military grade parts.
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
*ALWAYS CONNECT BOTH ANODE
AND BOTH CATHODE PINS
T
JMAX
(REGULATOR) = 100
°
C
T
(DIODE) = 125
°
C
SEE THERMAL MANAGEMENT SECTION FOR
θ
JA
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
ANODE*
CATHODE*
GND
V
C
FB
NC
NC
NC
ANODE*
CATHODE*
GND
E2
V
SW
E1
V
IN
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