LT1302CS8 查看數據表（PDF） - Linear Technology
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LT1302CS8
Linear Technology
LT1302CS8 Datasheet PDF : 16 Pages
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LT1302/LT1302-5
ABSOLUTE AXI U RATI GS
VIN Voltage ............................................................. 10V
SW Voltage ............................................................. 25V
FB Voltage .............................................................. 10V
SHDN Voltage ......................................................... 10V
VC Voltage ................................................................ 4V
IT Voltage .................................................................. 4V
Maximum Power Dissipation ............................ 700mW
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
GND 1
TOP VIEW
8 PGND
ORDER PART
NUMBER
VC 2
SHDN 3
(SENSE*)FB 4
7 SW
6 VIN
5 IT
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSION
PINS 1 AND 8 ARE INTERNALLY
CONNECTED IN SOIC PACKAGE
TJMAX = 125°C, θJA = 100°C/W (N8)
TJMAX = 125°C, θJA = 80°C/W (S8)
LT1302CN8
LT1302CS8
LT1302CN8-5
LT1302CS8-5
S8 PART MARKING
1302
13025
Consult factory for Industrial and Military grade parts.
DC ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 2.5V, unless otherwise noted.
SYMBOL
IQ
VIN
VFB
VOS
DC
tON
tOFF
VCESAT
VSHDNH
VSHDNL
ISHDN
PARAMETER
Quiescent Current
Input Voltage Range
CONDITIONS
VSHDN = 0.5V, VFB = 1.3V
VSHDN = 1.8V
Feedback Voltage (LT1302)
Feedback Pin Bias Current (LT1302)
Output Sense Voltage (LT1302-5)
Output Ripple Voltage (LT1302-5)
Sense Pin Resistance to Ground (LT1302-5)
Offset Voltage
Comparator Hysteresis
Oscillator Frequency
VC = 0.4V
VFB = 1V
VC = 0.4V
VC = 0.4V
See Block Diagram
(Note 1)
Current Limit Not Asserted (Note 2)
Maximum Duty Cycle
Switch On Time
Switch Off Time
Output Line Regulation
Switch Saturation Voltage
Switch Leakage Current
Switch Current Limit
Error Amplifier Voltage Gain
Shutdown Pin High
Shutdown Pin Low
Shutdown Pin Bias Current
IT Pin Resistance to Ground
Current Limit Not Asserted
2 < VIN < 8V
ISW = 2A
VSW = 5V, Switch Off
VC = 0.4V (Burst Mode Operation)
VC = 1.25V (Full Power) (Note 3)
0.9V ≤ VC ≤ 1.2V, ∆VC/∆VFB
VSHDN = 5V
VSHDN = 2V
VSHDN = 0V
MIN TYP MAX
q
200 300
q
15
25
2.0
q 2.2
8
q 1.22 1.24 1.26
100
q 4.85 5.05 5.25
50
420
15
5
175 220 265
q 160
310
75
86
95
3.9
0.7
q
0.06 0.15
310 400
q
475
q
0.1
10
1
q 2.0
2.8
3.9
50
75
q 1.8
q
0.5
q
8
20
3
q
0.1
1
3.9
UNITS
µA
µA
V
V
V
nA
V
mV
kΩ
mV
mV
kHz
kHZ
%
µs
µs
%/ V
mV
mV
µA
A
A
V/ V
V
V
µA
µA
µA
kΩ
The q denotes specifications which apply over the 0°C to 70°C
temperature range.
Note 1: Hysteresis is specified at DC. Output ripple depends on capacitor
size and ESR.
Note 2: The LT1302 operates in a variable frequency mode. Switching
frequency depends on load inductance and operating conditions and may
be above specified limits.
Note 3: Minimum switch current 100% tested. Maximum switch current
guaranteed by design.
2
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