LT1943 Просмотр технического описания (PDF) - Linear Technology
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LT1943 Datasheet PDF : 20 Pages
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LT1943
ABSOLUTE AXI U RATI GS
(Note 1)
VIN Voltage .............................................................. 25V
BOOST Voltage ........................................................ 36V
BOOST Voltage Above SW1 ..................................... 25V
BIAS Pin Voltage ..................................................... 18V
SW2, SW4 Pin Voltages .......................................... 40V
SW3 Voltage ............................................................ 40V
FB1, FB2, FB3, FB4 Voltages ...................................... 4V
NFB4 Voltage ................................................ +6V, –0.6V
VC1, VC2, VC3, VC4 Pin Voltages .............................. 6V
RUN-SS, SS-234 Pin Voltages ................................... 6V
PGOOD Pin Voltage ................................................. 36V
E3 Pin Voltage ......................................................... 38V
VON Voltage ............................................................. 38V
CT Pin Voltage ........................................................... 6V
Junction Temperature ........................................... 125°C
Operating Temperature Range (Note 2) ...–40°C to 85°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
GND 1
28 SW2
VC1 2
27 SW2
VC2 3
FB1 4
26 VON
25 CT
FB2 5
24 E3
FB3 6
23 PGOOD
NFB4 7
29
22 BIAS
FB4 8
21 SW3
VC3 9
20 GND
VC4 10
19 SW4
SGND 11
18 RUN-SS
BOOST 12
17 SS-234
SW1 13
16 VIN
SW1 14
15 VIN
FE PACKAGE
28-LEAD PLASTIC TSSOP
EXPOSED PAD (PIN 29) IS GROUND
(MUST BE SOLDERED TO PCB)
TJMAX = 125°C, θJA = 25°C/W, θJC = 7.5°C/W
ORDER PART
NUMBER
LT1943EFE
FE PART MARKING
1943E
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. VIN = 12V, RUN-SS, SS-234 = 2.5V unless otherwise noted.
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Quiescent Current
RUN-SS, SS-234 Pin Current
RUN-SS, SS-234 Threshold
BIAS Pin Voltage to Begin SS-234 Charge
BIAS Pin Current
FB Threshold Offset to Begin CT Charge
CT Pin Current Source
CT Threshold to Power VON
VON Switch Drop
Maximum VON Current
PGOOD Threshold Offset
PGOOD Sink Current
PGOOD Pin Leakage
Master Oscillator Frequency
Foldback Switching Frequency
Frequency Shift Threshold on FB
CONDITIONS
Not Switching
RUN-SS = SS-234 = 0V
RUN-SS, SS-234 = 0.4V
BIAS = 3.1V, All Switches Off
(Note 3)
All FB Pins = 1.5V
All FB Pins = 1.5V
VON Current = 30mA
VE3 = 30V
VPGOOD = 36V
All FB Pins = 0V
∆200kHz
MIN TYP MAX UNITS
●
4.5
V
22
V
10
14
mA
35
45
µA
1.7
µA
0.8
V
● 2.4
2.8 3.15
V
10.5
15
mA
90
125
160
mV
16
20
25
µA
1.0
1.1
1.2
V
180
240
mV
● 30
60
mA
90
125 160
mV
200
µA
1
µA
1.1
1.2 1.35
MHz
● 1.0
1.46
MHz
250
kHz
0.5
V
1943fa
2
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