LT1269 Просмотр технического описания (PDF) - Linear Technology
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LT1269 Datasheet PDF : 8 Pages
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LT1271/LT1269
ABSOLUTE AXI U RATI GS
Supply Voltage ....................................................... 30V
Switch Output Voltage ............................................ 60V
Feedback Pin Voltage (Transient, 1ms) ................ ±15V
Storage Temperature Range ................ – 65°C to 150°C
Operating Junction Temperature Range
Operating .............................................. 0°C to 100°C
Short Circuit ......................................... 0°C to 125°C
Lead Temperature (Soldering, 10 sec.)................ 300°C
PACKAGE/ORDER I FOR ATIO
FRONT VIEW
5
VIN
4
VSW
3
GND
2
FB
1
VC
Q PACKAGE
5-LEAD PLASTIC DD
TJ MAX = 100°C, θJC = 4°C/W, θJA = 30°C/W*
ORDER PART
NUMBER
LT1271CQ
LT1269CQ
FRONT VIEW
5
VIN
4
VSW
3
GND
2
FB
1
VC
T PACKAGE
5-LEAD PLASTIC TO-220
TJ MAX = 100°C, θJC = 4°C/W, θJA = 50°C/W
ORDER PART
NUMBER
LT1271CT
LT1269CT
*With device soldered to 1/2 square inch of 1oz copper over backside or internal layer
ground plane. Consult factory for Industrial and Military grade parts.
VSW 1
VSW 2
NC 3
GND 4
POWER GND 5
SWITCH GND 6
GND 7
AGND 8
VC 9
FB 10
TOP VIEW
20 VSW
19 VSW
18 NC
17 GND
16 GND POWER
15 GND SWITCH
14 GND
13 VIN
12 NC
11 NC
SW PACKAGE
20-LEAD PLASTIC WIDE SO
θ WILL VARY FROM APPROXIMATELY 40°C/W
WITH 0.75 SQ. IN. OF 1 OZ. COPPER TO 46°C/W
WITH 0.33 SQ. IN. OF 1 OZ. COPPER
ORDER PART
NUMBER
LT1269CS
ELECTRICAL CHARACTERISTICS VIN = 15V, VC = 0.5V, VFB = VREF, switch pin open, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VREF
Reference Voltage
Measured at Feedback Pin
1.224 1.244
1.264
V
VC = 0.8V
q
1.214 1.244
1.274
V
IB
Feedback Input Current
VFB = VREF
350
750
nA
q
1100
nA
gm
Error Amplifier
Transconductance
∆IC = ±25µA
3000
4400
6000
q
2400
7000
µmho
µmho
Error Amplifier Source or
Sink Current
VC = 1.5V
150
200
350
µA
q
120
400
µA
Error Amplifier Clamp
Voltage
Hi Clamp, VFB = 1V
Lo Clamp, VFB = 1.5V
1.8
2.3
V
0.25
0.38
0.52
V
Reference Voltage Line
Regulation
3V ≤ VIN ≤ VMAX, VC = 0.8V
q
0.03
%/V
AV
Error Amplifier Voltage Gain
0.9V ≤ VC ≤ 1.4V
Minimum Input Voltage (Note 3)
500
800
V/V
q
2.8
3.0
V
IQ
Supply Current
3V ≤ VIN ≤ VMAX, VC = 0.6V
7
10
mA
2
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