LT3781 데이터 시트보기 (PDF) - Linear Technology
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LT3781 Datasheet PDF : 20 Pages
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LT3781
ABSOLUTE AXI U RATI GS
(Note 1)
Power Supply (VCC)
Low Impedance Source Voltage ............. –0.3V to 20V
Shutdown Mode:
(Supply Self-Regulates to 18V)
Maximum Input Current ............................... 20mA
Topside Supply (VBST) ....................................................
VBSTREF – 0.3V to VBSTREF +20V (VBST(MAX) = 90V)
Topside Reference Pin (VBSTREF) ............... –0.6V to 75V
SHDN Pin Voltage ........................... –0.3V to VCC + 0.3V
All Other Input Voltages .............. –0.3V to 5VREF + 0.3V
5VREF Pin Sink Current ......................................... 10mA
FSET Pin Current ...................................... –2mA to 5mA
All Other Input Pin Currents ...................... –2mA to 2mA
Operating Ambient
Temperature Range (Note 4) ...............–40°C to 85°C
Operating Junction
Temperature Range ...............................–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
SHDN 1
OVLO 2
THERM 3
SGND 4
5VREF 5
FSET 6
SYNC 7
SS 8
VFB 9
VC 10
20 VBST
19 TG
18 BSTREF
17 NC
16 NC
15 BG
14 PWRGND
13 VCC
12 SG
11 SENSE
G PACKAGE
20-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 90°C/W
ORDER PART
NUMBER
LT3781EG
LT3781IG
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VCC = VBST = 12V, VBSTREF = 0V, VVC = 2V, VFB = VREF = 1.25V, CTG = CBG = CSG = 1000pF.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Supply and Protection
VCCUVLO Undervoltage Lockout Threshold
Falling Edge
Rising Edge
q
8.0
8.4
8.6
q
13
14.5
16
VCCSHDN Shutdown Mode Shunt Regulator
ICC
DC Active Supply Current
100µA < IVCC ≤ 10mA
(Note 2)
q
16.5
18
19.9
17
22
q
25
VBST
VSHDN
DC Active UVLO Supply Current
DC Standby Supply Current
DC Active Supply Current
DC Standby Supply Current
Shutdown Rising Threshold
Shutdown Threshold Hysteresis
VSHDN = 1.35V, VCC = 8V
VSHDN < 0.3V
TG Logic High (Note 2)
VSHDN < 0.3V
q
800 1200
q
16
30
q
5.0
8.5
0.1
q
1.15 1.25 1.35
100 150 200
ISS
VSS
VBSTUVLO
Soft-Start Charge Current
Soft-Start Reset Threshold
Boost Undervoltage Lockout
(VBST-BSTREF)
Boost UVLO Hysteresis
VSS = 2V
Falling Edge
Rising Edge
q
–14 – 10
–6
225
q
5.7
6.4
7.1
q
6.5
7.0
7.5
q
0.3
0.6
5V External Reference
V5VREF 5V Reference Voltage
0 ≤ (I5VREF – IVC) < 20mA
4.85
5.0
5.10
q
4.80
5.15
I5VREFSC Short-Circuit Current
R5VREF Output Impedance
Source, IVC = 0
0 ≤ (I5VREF – IVC) < 20mA
q
20
45
1
2
UNITS
V
V
V
mA
mA
µA
µA
mA
µA
V
mV
µA
mV
V
V
V
V
V
mA
Ω
3781f
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