Datasheet

LTC3780
3
3780ff
For more information www.linear.com/LTC3780
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. (Note 7) V
IN
= 15V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
V
OSENSE
Feedback Reference Voltage I
TH
= 1.2V, –40°C ≤ T ≤ 85°C (Note 3)
–55°C ≤ T ≤ 125°C
l
l
0.792
0.792
0.800
0.800
0.808
0.811
V
V
I
VOSENSE
Feedback Pin Input Current (Note 3) –5 –50 nA
V
LOADREG
Output Voltage Load Regulation (Note 3)
∆I
TH
= 1.2V to 0.7V
∆I
TH
= 1.2V to 1.8V
l
l
0.1
–0.1
0.5
–0.5
%
%
V
REF(LINEREG)
Reference Voltage Line Regulation V
IN
= 4V to 30V, I
TH
= 1.2V (Note 3) 0.002 0.02 %/V
g
m(EA)
Error Amplifier Transconductance I
TH
= 1.2V, Sink/Source = 3µA (Note 3) 0.32 mS
g
m(GBW)
Error Amplifier GBW (Note 8) 0.6 MHz
I
Q
Input DC Supply Current
Normal
Standby
Shutdown Supply Current
(Note 4)
V
RUN
= 0V, V
STBYMD
> 2V
V
RUN
= 0V, V
STBYMD
= Open
2400
1500
55 70
µA
µA
µA
V
FCB
Forced Continuous Threshold 0.76 0.800 0.84 V
I
FCB
Forced Continuous Pin Current V
FCB
= 0.85V –0.30 –0.18 –0.1 µA
V
BINHIBIT
Burst Inhibit (Constant Frequency)
Threshold
Measured at FCB Pin 5.3 5.5 V
UVLO Undervoltage Reset V
IN
Falling
l
3.8 4 V
V
OVL
Feedback Overvoltage Lockout Measured at V
OSENSE
Pin 0.84 0.86 0.88 V
I
SENSE
Sense Pins Total Source Current V
SENSE
–
= V
SENSE
+
= 0V –380 µA
V
STBYMD(START)
Start-Up Threshold V
STBYMD
Rising 0.4 0.7 V
V
STBYMD(KA)
Keep-Alive Power-On Threshold V
STBYMD
Rising, V
RUN
= 0V 1.25 V
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3780EG#PBF LTC3780EG#TRPBF LTC3780EG 24-Lead Plastic SSOP –40°C to 85°C
LTC3780IG#PBF LTC3780IG#TRPBF LTC3780IG 24-Lead Plastic SSOP –40°C to 125°C
LTC3780EUH#PBF LTC3780EUH#TRPBF 3780
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3780IUH#PBF LTC3780IUH#TRPBF 3780I
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3780EG LTC3780EG#TR LTC3780EG 24-Lead Plastic SSOP –40°C to 85°C
LTC3780IG LTC3780IG#TR LTC3780IG 24-Lead Plastic SSOP –40°C to 125°C
LTC3780MPG LTC3780MPG#TR LTC3780MPG 24-Lead Plastic SSOP –55°C to 125°C
LTC3780EUH LTC3780EUH#TR 3780
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3780IUH LTC3780IUH#TR 3780I
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/