LTC3780_12 Datasheet, PDF (3/28 Pages) Linear Technology – High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller

ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3780EG#PBF
LTC3780EG#TRPBF
LTC3780EG
24-Lead Plastic SSOP
LTC3780IG#PBF
LTC3780IG#TRPBF
LTC3780IG
24-Lead Plastic SSOP
LTC3780EUH#PBF
LTC3780EUH#TRPBF 3780
32-Lead (5mm × 5mm) Plastic QFN
LTC3780IUH#PBF
LTC3780IUH#TRPBF
3780I
32-Lead (5mm × 5mm) Plastic QFN
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3780EG
LTC3780EG#TR
LTC3780EG
24-Lead Plastic SSOP
LTC3780IG
LTC3780IG#TR
LTC3780IG
24-Lead Plastic SSOP
LTC3780MPG
LTC3780MPG#TR
LTC3780MPG
24-Lead Plastic SSOP
LTC3780EUH
LTC3780EUH#TR
3780
32-Lead (5mm × 5mm) Plastic QFN
LTC3780IUH
LTC3780IUH#TR
3780I
32-Lead (5mm × 5mm) Plastic QFN
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/
LTC3780
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–40°C to 125°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
–40°C to 85°C
–40°C to 125°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T_A = 25°C. V_IN = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
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 0.792 0.800 0.808
l 0.792 0.800 0.811
I_VOSENSE
Feedback Pin Input Current
(Note 3)
V_LOADREG
Output Voltage Load Regulation
(Note 3)
∆I_TH = 1.2V to 0.7V
l
∆I_TH = 1.2V to 1.8V
l
V_REF(LINEREG)
Reference Voltage Line Regulation
V_IN = 4V to 30V, I_TH = 1.2V (Note 3)
–5
–50
0.1
0.5
–0.1 –0.5
0.002 0.02
g_m(EA)
g_m(GBW)
I_Q
V_FCB
Error Amplifier Transconductance
Error Amplifier GBW
Input DC Supply Current
Normal
Standby
Shutdown Supply Current
Forced Continuous Threshold
I_TH = 1.2V, Sink/Source = 3μA (Note 3)
(Note 8)
(Note 4)
V_RUN = 0V, V_STBYMD > 2V
V_RUN = 0V, V_STBYMD = Open
0.32
0.6
2400
1500
55
70
0.76 0.800 0.84
I_FCB
V_BINHIBIT
Forced Continuous Pin Current
Burst Inhibit (Constant Frequency)
Threshold
V_FCB = 0.85V
Measured at FCB Pin
–0.30 –0.18 –0.1
5.3
5.5
UVLO
V_OVL
I_SENSE
V_{STBYMD(START)}
V_STBYMD(KA)
Undervoltage Reset
Feedback Overvoltage Lockout
Sense Pins Total Source Current
Start-Up Threshold
Keep-Alive Power-On Threshold
V_IN Falling
Measured at V_OSENSE Pin
V_SENSE– = V_SENSE+ = 0V
V_STBYMD Rising
V_STBYMD Rising, V_RUN = 0V
l
3.8
4
0.84 0.86 0.88
–380
0.4
0.7
1.25
UNITS
V
V
nA
%
%
%/V
mS
MHz
μA
μA
μA
V
μA
V
V
V
μA
V
V
3780fe
3