LT1950 데이터 시트보기 (PDF) - Linear Technology
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LT1950 Datasheet PDF : 20 Pages
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LT1950
ABSOLUTE AXI U RATI GS
(Note 1)
BOOST ....................................................... –0.3V to 35V
VIN, VIN2, SHDN ......................................... –0.3V to 25V
FB, SYNC, VSEC ........................................... –0.3V to 6V
COMP, BLANK .......................................... –0.3V to 3.5V
SLOPE ...................................................... –0.3V to 2.5V
ISENSE ......................................................... –0.3V to 1V
ROSC .................................................................... –50µA
VREF .................................................................... –10mA
Operating Junction Temperature Range
LT1950EGN/LT1950IGN (Notes 2, 5) ... – 40°C to 125°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
COMP 1
FB 2
ROSC 3
SYNC 4
SLOPE 5
VREF 6
SHDN 7
GND 8
16 VSEC
15 VIN
14 BOOST
13 PGND
12 GATE
11 VIN2
10 ISENSE
9 BLANK
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 110°C/W,
θJC (PIN 8) = 30°C/W
ORDER PART
NUMBER
LT1950EGN
LT1950IGN
GN PART MARKING
1950E
1950I
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. COMP = open, FB = 1.4V, ROSC = 249k, SYNC = 0V, SLOPE = open, VREF
= 0.1µF, SHDN = VIN, BLANK = 0V, ISENSE = 0V, VIN2 = 15V, GATE = 1nF, BOOST = open, VIN = 15V, VSEC = 0V, unless otherwise
specified.
PARAMETER
PWM Controller
Operating Input Voltage
Minimum Start-Up Voltage
VIN Quiescent Current
VIN Shutdown Current
Shutdown Threshold
Shutdown Pin Current
Shutdown Pin Current Hysteresis
VIN2 Quiescent Current
VIN2 Shutdown Current
VREF (External Output)
Output Voltage
Line Regulation
Load Regulation
Oscillator
Frequency: fOSC
Minimum Programmable fOSC
Maximum Programmable fOSC
SYNC Input Resistance
SYNC Switching Threshold
SYNC Frequency/fOSC
fOSC Line Reg
VROSC
CONDITIONS
MIN TYP MAX UNITS
IVREF = 0µA
● 3.0
25
V
IVREF = 0µA
●
2.6
3.0
V
IVREF = 0µA, FB = 1V, ISENSE = 0.2V
2.3
3.0
mA
SHDN = 0V
5
20
µA
3V < VIN < 25V
● 1.261 1.32 1.379
V
SHDN = 70mV Above Threshold
–7
–10 –13
µA
SHDN = 100mV Below Threshold
4
7
10
µA
I(VREF) = 0µA, FB = 1V, ISENSE = 0.2V
1.7
2.5
mA
SHDN = 0V, VIN2 = 2.7V (Boost Diode from VIN = 3V)
500 700
µA
IVREF = 0µA
IVREF = 0µA, 3V < VIN < 25V
0µA < IVREF < 2.5mA
● 2.425 2.500 2.575
V
1
5
mV
1
5
mV
ROSC = 249k, FB = 1V
ROSC = 499k
ROSC = 90.9k
(ROSC = 249k, fOSC =200kHz), FB = 1V (Note 7)
3V < VIN < 25V
9.5V < VIN2 < 25V
● 170
200
230
kHz
85
100 115
kHz
440 500 560
kHz
20
kΩ
1.5
2.2
V
1.25
1.5
0.05 0.15
%/V
0.05 0.25
%/V
1
V
1950fa
2
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