LTC3785 LINER [Linear Technology], LTC3785 Datasheet - Page 3

• Manufacturer Part Number: LTC3785
• Description: High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
• Manufacturer: LINER [Linear Technology]

elecTrical characTerisTics
junction temperature range, otherwise specifications are at T
SYMBOL
V
V
V
I
V
V
g
I
UVLO
UVLO Hyst
I
I
I
I
I
V
V
I
I
V
V
R
R
TG t
TG t
BG t
BG t
TG/BG t
BG/TG t
DF
D
D
FB
Q
SENSE
SENSE
IOSENSE
IOSENSE
SS
RUN
RUN(HYS)
IN
OUT
FB
REFLNREG
LOADREG
m
RUN(ON)
RUN(HYS)
SENSE(MAX)
SENSE(IAVG)
DSPFET(ON)
DSNFET(ON)
ON(MIN,BOOST)
ON(MIN,BUCK)
MAX,BOOST
r
f
r
f
+
–
1D
1D
+
–
PARAMETER
Input Supply Voltage
Output Voltage
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifier g
Input DC Supply Current
Undervoltage Lockout
Undervoltage Hysteresis
SENSE Pins Current
I
Soft-Start Charge Current
RUN Pin On-Threshold
RUN Pin On-Hysteresis
RUN Pin Source Current
RUN Pin Hysteresis Current
Maximum Current Sense Threshold
Maximum Input/Output Average
Current Sense Threshold
Driver Pull-Up On-Resistance
Driver Pull-Down On-Resistance
Top Gate Rise Time
Top Gate Fall Time
Bottom Gate Rise Time
Bottom Gate Fall Time
Top Gate Off to Bottom Gate On
Delay Synchronous Switch-On
Delay Time
Bottom Gate Off to Top Gate On
Delay Top Switch-On Delay Time
Maximum Duty Factor
Minimum Duty Factor for Main
Switch in Boost Operation
Minimum Duty Factor for Main
Switch in Buck Operation
OSENSE
Normal Mode
Shutdown
Buck Region
Boost Region
Pins Current
m
CONDITIONS
I
I
(Note 4)
V
(Note 4)
I
(Note 5)
INTV
V
V
V
V
V
V
I
I
I
C
C
% Switch C On
% Switch C On
% Switch B On
V
TH
TH
TH
LIM
LIM
LIM
IN
SENSE
IOSENSE
SS
RUN
FB
FB
LOAD
LOAD
RUN
Measured in Servo Loop, ∆I
Measured in Servo Loop, ∆I
Voltage = 1.2V (Note 4), T
= 1.2V, T
= 1.2V, Sink/Source 5µA (Note 4)
= 4V to 38V (Note 4)
= 0.7V
= 0.7V
= 0V
= 0V
Floating
= INTV
CC
Rising
= 0V
= 3300pF Each Driver (Note 6)
= 3300pF Each Driver (Note 6)
–
Ramping Down
= V
–
= V
The
CC
SENSE
A
A
IOSENSE
= 125°C, T
= 25°C (Note 2). V
l
+
denotes the specifications which apply over the full operating
= 0V
+
= 10V
A
= –40°C to 125°C
A
TH
TH
= –40°C to 85°C
Voltage = 1.4V to 2V
Voltage = 2V to 2.6V
IN
= 15V, V
RUN
= 5V, unless otherwise noted.
l
l
l
l
l
l
0.792
0.788
MIN
110
130
0.8
60
47
90
4
2
0.800
0.800
0.002
–0.01
1.22
TYP
–15
150
140
100
145
0.01
1.5
3.4
0.4
0.2
1.2
2.6
1.5
40
10
90
50
25
25
25
25
60
60
90
LTC3789
3
3
5
9
9
0.808
0.812
MAX
0.02
–0.1
–50
110
165
106
160
3.6
38
38
60
±1
14
53
0.1
4
UNITS
mmho
3
3789f
%/V
mA
mV
mV
mV
mV
mV
mV
nA
µA
µA
µA
µA
µA
µA
ns
ns
ns
ns
ns
ns
%
%
%
%
%
Ω
Ω
V
V
V
V
V
V
V