LTC3778 Ver la hoja de datos (PDF) - Linear Technology
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LTC3778 Datasheet PDF : 24 Pages
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LTC3778
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VIN, ION)..................36V to – 0.3V
Boosted Topside Driver Supply Voltage
(BOOST) ................................................... 42V to – 0.3V
SENSE+, SW Voltage.................................... 36V to – 5V
DRVCC, EXTVCC, (BOOST – SW), FCB,
RUN/SS, PGOOD Voltages .................... 7V to – 0.3V
VON, VRNG Voltages ................... INTVCC + 0.3V to – 0.3V
ITH, VFB Voltages...................................... 2.7V to – 0.3V
TG, BG, INTVCC Peak Currents .................................. 2A
TG, BG, INTVCC RMS Currents ............................ 50mA
Operating Ambient Temperature
Range (Note 4) ................................... – 40°C to 85°C
Junction Temperature (Note 2) ............................ 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
RUN/SS 1
VON 2
PGOOD 3
VRNG 4
ITH 5
FCB 6
SGND 7
ION 8
VFB 9
EXTVCC 10
20 BOOST
19 TG
18 SW
17 SENSE+
16 SENSE–
15 PGND
14 BG
13 DRVCC
12 INTVCC
11 VIN
F PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 110°C/ W
ORDER PART
NUMBER
LTC3778EF
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. VIN = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
Main Control Loop
IQ
Input DC Supply Current
Normal
Shutdown Supply Current
900 2000
15
30
VFB
∆VFB(LINEREG)
∆VFB(LOADREG)
IFB
gm(EA)
VFCB
IFCB
tON
Feedback Reference Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Feedback Pin Input Current
Error Amplifier Transconductance
Forced Continuous Threshold
Forced Continuous Pin Current
On-Time
tON(MIN)
tOFF(MIN)
VSENSE(MAX)
Minimum On-Time
Minimum Off-Time
Maximum Current Sense Threshold
VSENSE– – VSENSE+
VSENSE(MIN)
Minimum Current Sense Threshold
VSENSE+ – VSENSE–
∆VFB(OV)
∆VFB(UV)
Output Overvoltage Fault Threshold
Output Undervoltage Fault Threshold
ITH = 1.2V (Note 3)
VIN = 4V to 30V, ITH = 1.2V (Note 3)
ITH = 0.5V to 1.9V (Note 3)
ITH = 1.2V (Note 3)
VFCB = 0.6V
ION = 60µA, VON = 1.5V
ION = 60µA, VON = 0V
ION = 180µA, VON = 0V
ION = 60µA, VON = 1.5V
VRNG = 1V, VFB = 0.56V
VRNG = 0V, VFB = 0.56V
VRNG = INTVCC, VFB = 0.56V
VRNG = 1V, VFB = 0.64V
VRNG = 0V, VFB = 0.64V
VRNG = INTVCC, VFB = 0.64V
q 0.594
q 1.4
q 0.57
200
q 113
q 79
q 158
7.5
340
0.600
0.002
– 0.05
–5
1.7
0.6
–1
250
110
50
250
133
93
186
67
47
93
10
400
0.606
– 0.3
±100
2
0.63
–2
300
100
400
153
107
214
12.5
460
UNITS
µA
µA
V
%/V
%
nA
mS
V
µA
ns
ns
ns
ns
mV
mV
mV
mV
mV
mV
%
mV
3778f
2
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