參數(shù)資料
型號(hào)： LT1507IS8-3.3#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 3 A SWITCHING REGULATOR, 570 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁(yè)數(shù)： 16/20頁(yè)
文件大?。?/td> 291K
代理商： LT1507IS8-3.3#TR
5
LT1507
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Inductor Core Loss for 3.3V Output
INDUCTANCE (
H)
1
0.001
CORE
LOSS
(W)
0.1
0.01
1.0
24
6
8
10
LT1507 TPC17
TYPE 52 POWDERED IRON
Kool M
PERMALLOY
= 125
Metglas
CORE LOSS IS INDEPENDENT OF LOAD CURRENT
UNTIL LOAD CURRENT FALLS LOW ENOUGH
FOR CIRCUIT TO GO INTO DISCONTINUOUS MODE
VOUT = 3.3V
VIN = 5V
IOUT = 1A
Kool M
is a registered trademark of Magnetics, Incorporated.
Metglas is a registered trademark of AlliedSignal Incorporated.
BOOST (Pin 1): The BOOST pin is used to provide a drive
voltage, higher than the input voltage, to the internal
bipolar NPN power switch. Without this added voltage the
typical switch voltage loss would be about 1.5V. The
additional boost voltage allows the switch to saturate and
voltage loss approximates that of a 0.3
FET structure,
but with a much smaller die area. Efficiency improves from
PIN FUNCTIONS
UU
U
70% for conventional bipolar designs to greater than 85%
for these new parts.
VIN (Pin 2): Input Pin. The LT1507 is designed to operate
with an input voltage between 4.5V and 15V. Under certain
conditions, input voltage may be reduced down to 4V.
Actual minimum operating voltage will always be higher
than the output voltage. It may be limited by switch
OUTPUT VOLTAGE (%)
0
OUTPUT
CURRENT
(A)
2.5
2.0
1.5
1.0
0.5
0
80
LT1507 TPC13
20
40
60
100
MOS LOAD
RESISTOR LOAD
CURRENT
SOURCE LOAD
FOLDBACK
CHARACTERISTICS
*POSSIBLE
UNDESIRED
STABLE POINT
FOR CURRENT
SOURCE LOAD
*SEE "MORE THAN JUST VOLTAGE FEEDBACK"
IN APPLICATIONS INFORMATION SECTION
Current Limit Foldback
INPUT VOLTAGE (V)
4
0
CURRENT
(A)
0.25
0.50
0.75
1.00
1.25
1.50
6
8
10
12
LT1507 TPC14
14
L = 10
H
L = 5
H
L = 3
H
L = 2
H
VOUT = 3.3V
Maximum Load Current
at VOUT = 3.3V
INPUT VOLTAGE (V)
0
CURRENT
(A)
0.25
0.50
0.75
1.00
1.25
1.50
369
12
LT1507 TPC15
15
L = 10
H
L = 5
H
L = 20
H
Maximum Load Current
at VOUT = 5V
Boost Pin Current
SWITCH CURRENT (A)
0
BOOST
PIN
CURRENT
(mA)
12
10
8
6
4
2
0
0.25
0.50
0.75
1.00
LT1507 TPC16
1.25
TJ = 25°C
Switch Voltage Drop
SWITCH CURRENT (A)
0
SWITCH
VOLTAGE
(V)
0.8
0.6
0.4
0.2
0
0.25
0.50
0.75
1.00
LT1507 TPC18
1.25
1.50
TJ = 25°C
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