LTC3731 Linear Technology, LTC3731 Datasheet - Page 3

• Manufacturer Part Number: LTC3731
• Description: Synchronous Buck Switching Regulator Controller
• Manufacturer: Linear Technology

www.DataSheet4U.com
ELECTRICAL CHARACTERISTICS
SYMBOL
V
I
V
V
g
g
V
I
V
UVR
UVADJ
I
I
I
V
V
V
I
I
I
DF
TG t
BG t
TG/BG t
BG/TG t
t
temperature range, otherwise specifications are at T
MATCH
FCB
UVADJ
Q
RUN/SS
SCL
SDLHO
SENSE
ON(MIN)
m
mOL
SENSEMAX
LOADREG
REFLNREG
FCB
BINHIBIT
RUN/SS
RUN/SSARM
RUN/SSLO
MAX
R,
R,
t
F
t
F
1D
2D
PARAMETER
Maximum Current Sense Threshold
Maximum Current Threshold Match
Output Voltage Load Regulation
Output Voltage Line Regulation
Transconductance Amplifier g
Transconductance Amplifier GBW
Forced Continuous Threshold
FCB Bias Current
Burst Inhibit Threshold
Undervoltage RUN/SS Reset
Undervoltage Lockout Threshold
Undervoltage Bias Current
Input DC Supply Current
Soft-Start Charge Current
RUN/SS Pin ON Threshold
RUN/SS Pin Arming Threshold
RUN/SS Pin Latch-Off Threshold
RUN/SS Discharge Current
Shutdown Latch Disable Current
SENSE Pins Source Current
Maximum Duty Factor
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
Minimum On-Time
Normal Mode
Shutdown
m
CONDITIONS
V
V
LTC3731IG
Worst-Case Error at V
(Note 3)
Measured in Servo Loop, ∆I
LTC3731IG
Measured in Servo Loop, ∆I
LTC3731IG
V
I
LTC3731IG
I
LTC3731IG
V
Measured at FCB Pin
V
At UVADJ Threshold
(Note 4)
V
V
V
V
V
Latch-Off is Armed
V
Soft-Short Condition V
V
SENSE1
SENSE3
In Dropout, V
C
C
C
C
All Controllers, C
All Controllers, C
Tested with a Square Wave (Note 5)
TH
TH
EAIN
SENSE1
CC
FCB
CC
CC
RUN/SS
RUN/SS
RUN/SS
RUN/SS
RUN/SS
EAIN
LOAD
LOAD
LOAD
LOAD
= 1.2V, Sink/Source 25µA (Note 3)
= 1.2V (g
= 4.5V to 7V
Lowered Until the RUN/SS Pin is Pulled Low
= 5V
= 0.65V
A
= 0.5V, V
= 0.375V, V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 25°C. V
–
, Ramping Positive
, Ramping Positive Until Short-Circuit
, Ramping Negative
+
–
= 0V
= 1.9V
,
, SENSE1
All Equal 1.2V; Current at Each Pin
V
SENSE2
The
m
SENSEMAX
• Z
ITH
LOAD
LOAD
●
L
RUN/SS
CC
–
Open,
, Z
–
,
, SENSE2
denotes the specifications which apply over the full operating
V
= V
L
SENSE3
SENSEMAX
= 3300pF Each Driver
= 3300pF Each Driver
= Series 1k-100kΩ-1nF)
EAIN
≤ 30mV
= 4.5V
RUN/SS
= 0.375V, V
TH
TH
– = 0.6V, 1.8V
+
, SENSE2
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 2V
= 5V unless otherwise noted.
RUN/SS
–
, SENSE3
= 4.5V
+
●
●
●
●
●
●
●
●
●
●
V
CC
0.58
0.54
1.13
–0.8
MIN
3.3
65
62
60
–5
–5
95
4
3
1
– 1.5 V
CC
–0.1
–0.1
–1.5
–1.5
TYP
0.03
0.60
0.60
1.18
98.5
110
0.2
3.8
0.2
2.3
1.5
3.8
3.2
1.5
75
75
50
13
30
40
30
20
50
60
0.1
0.1
5
5
3
– 0.7 V
LTC3731
CC
MAX
– 2.5
–0.5
–0.7
0.62
0.66
1.23
100
0.7
4.5
3.5
1.9
4.5
85
88
90
50
20
90
90
90
90
0.5
0.7
5
6
7
5
– 0.3
UNITS
mmho
mmho
3731fa
3
MHz
%/V
mV
mV
mV
mA
µA
nA
µA
µA
µA
µA
µA
ns
ns
ns
ns
ns
ns
ns
%
%
%
%
%
%
V
V
V
V
V
V
V
V