LT1309 Просмотр технического описания (PDF) - Linear Technology
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LT1309 Datasheet PDF : 8 Pages
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LT1309
ABSOLUTE AXI U RATI GS
VCC Voltage............................................................... 7V
VSW Voltage ............................................................ 20V
VSENSE Voltage ....................................................... 20V
VON/OFF Voltage......................................................... 7V
VSEL Voltage ............................................................. 7V
ILIM Voltage .............................................................. 7V
Maximum Power Dissipation ............................ 500mW
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
SOFT START 1
VCC 2
8 ON/OFF
7 SENSE
LT1309CS8
PGND 3
6 VPP VALID
VSW 4
5 GND
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/W
S8 PART MARKING
1309
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS TA = 25°C, VCC = 5V, VON/OFF = 3V, unless otherwise noted.
SYMBOL
IQ
fOSC
DC
tON
VCESAT
PARAMETER
CONDITIONS
Quiescent Current
Quiescent Current, Shutdown
Input Voltage Range
VSENSE = 12V
VON/OFF = 0.2V
Output Sense Voltage
q
Output Referred Comparator Hysteresis
Oscillator Frequency
Current Limit Not Asserted
Maximum Duty Cycle
q
Switch ON Time
Reference Line Regulation
Switch Saturation Voltage
Switch Leakage Current
Switch Current Limit
Soft Start Current
2V < VIN < 6V
ISW = 0.5A
VSW = 12V, Switch Off
VIN = 5V, Soft Start Floating
VIN = 3V, Soft Start Floating
Soft Start Grounded
ON/OFF Input Voltage Low
ON/OFF Input Voltage High
ON/OFF Bias Current
Sense Pin Input Current
VPP VALID Threshold
VPP VALID Output Voltage Low
VPP VALID Output Voltage High
VON/OFF = 5V
VON/OFF = 3V
VON/OFF = 0V
VON/OFF = 0.2V
VSENSE Rising (High to Low Transition)
ISINK = 100µA
ISOURCE = 2.5µA
The q denotes specifications which apply over the full operating
temperature range.
MIN TYP MAX
650
900
9
15
2
6
11.5
12
12.6
35
400
500
700
80
85
92
1.7
0.06 0.15
230
350
0.1
10
400
600
900
450
650
950
80
120
0.8
1.6
16.0 24.0
8.0 14.0
0.1
1.0
50.0
90
0.1
1
VSENSE – 200mV
0.13 0.3
4
4.5
UNITS
µA
µA
V
V
mV
kHz
%
µs
%/V
mV
µA
mA
mA
µA
V
V
µA
µA
µA
µA
µA
V
V
2
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