LT1507IS8 Linear Technology, LT1507IS8 Datasheet - Page 3

• Manufacturer Part Number: LT1507IS8
• Description: IC SW REG BUCK MODE ADJ 8-SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT1507IS8

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adjustable
• Current - Output: 1.5A
• Frequency - Switching: 500kHz
• Voltage - Input: 4 ~ 15 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

T
ELECTRICAL CHARACTERISTICS
The
range.
Note 1: Gain is measured with a V
clamp level to 200mV below the upper clamp level.
Note 2: Minimum input voltage is not measured directly, but is guaranteed
by other tests. It is defined as the voltage where internal bias lines are still
regulated, so that the reference voltage and oscillator frequency remain
constant. Actual minimum input voltage to maintain a regulated output will
depend on output voltage and load current. See Applications Information.
Note 3: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 4: Boost current is the current flowing into the BOOST pin with the
pin held 5V above input voltage. It flows only during switch ON time.
PARAMETER
Switch Frequency
Switch Frequency Line Regulation
Frequency Shifting Threshold on F
Minimum Input Voltage (Note 2)
Minimum Boost Voltage (Note 3)
Boost Current (Note 4)
Input Supply Current (Note 5)
Shutdown Supply Current
Lockout Threshold
Shutdown Threshold
Minimum Synchronizing Amplitude
Synchronizing Frequency Range (Note 7)
TYPICAL PERFORMANCE CHARACTERISTICS
J
= 25 C, V
1.4
1.2
1.0
0.8
0.6
0.4
–50
denotes specifications which apply over the operating temperature
V
C
Pin Shutdown Threshold
–25
IN
JUNCTION TEMPERATURE ( C)
= 5V, V
0
C
25
= 1.5V, boost open, switch open unless otherwise specified.
50
75
C
B
swing equal to 200mV above the low
Pin
W
LT1507 • TPC01
100
U
125
CONDITIONS
V
– 25 C T
T
4.3V V
I
V
V
V
V
V
SW
J
C
BOOST
SHDN
SW
C
C
f = 10kHz
Set to Give 50% Duty Cycle
Open
Open
–25 C
= 0V, V
1.5A
= 0V, V
= V
IN
100
90
80
70
60
50
J
IN
C
Switch Peak Current Limit
0
15V
+ 5V
Open
125 C
IN
V
V
IN
OUT
= 5V
12V
0.25
= 3.3V
I
I
Device Shutting Down
Device Starting Up
SW
SW
LOAD CURRENT (A)
0.50
= 500mA, –25 C T
= 1.5A,
0.75
Note 5: Input supply current is the bias current drawn by the V
the SHDN pin is held at 1V (switching disabled).
Note 6: Switch ON resistance is calculated by dividing V
by the forced current (1.5A). See Typical Performance Characteristics for
the graph of switch voltage at other currents.
Note 7: For synchronizing frequency above 700kHz, with duty cycles
above 50%, external slope compensation may be needed. See Applications
Information.
Note 8: Transconductance and voltage gain refer to the internal amplifier
exclusive of the voltage divider. To calculate gain and transconductance
refer to SENSE pin on fixed voltage parts. Divide values shown by the ratio
V
OUT
T
–25 C T
T
J
J
/2.42.
–25 C
–25 C
1.00
LT1507 • TA02
J
J
1.25
125 C
125 C
2.44
2.43
2.42
2.41
2.40
–50
Feedback Pin Voltage and Current
MIN
0.15
0.25
460
440
440
580
0.8
2.3
–25
JUNCTION TEMPERATURE ( C)
0
0.05
2.38
0.37
0.45
TYP
500
1.0
3.8
1.5
12
25
15
4
3
VOLTAGE
CURRENT
25
50
IN
MAX
1000
0.15
2.46
0.70
0.70
75
540
560
570
1.3
4.3
3.5
5.4
2.2
22
25
35
40
50
75
to V
LT1507
LT1507 • TPC03
100
SW
IN
pin when
voltage
125
UNITS
3
2.0
1.5
1.0
0.5
0
%/V
kHz
kHz
kHz
kHz
mA
mA
mA
mA
mA
V
V
V
A
A
V
V
V
V