LTC3731HG Linear Technology, LTC3731HG Datasheet - Page 3

• Manufacturer Part Number: LTC3731HG
• Description: IC REG SW SYNC 3PH STPDWN 36SSOP
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3731HG

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 6 V
• Frequency - Switching: 225kHz ~ 680kHz
• Voltage - Input: 4 ~ 36 V
• Operating Temperature: -40°C ~ 140°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Not Compliant

ELECTRICAL CHARACTERISTICS
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
Power Good Output Indication
V
I
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
temperature range, otherwise specifications are at T
SYMBOL
FCB
UVADJ
Q
RUN/SS
SCL
SDLHO
SENSE
ON(MIN)
PGOOD
NOM
LOW
HIGH
BINHIBIT
RUN/SS
RUN/SSARM
RUN/SSLO
PGL
PGTHNEG
PGTHPOS
PGDLY
MAX
R,
R,
t
F
t
F
1D
2D
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
PGOOD Voltage Output Low
PGOOD Output Leakage
PGOOD Trip Thresholds
V
V
Power Good Fault Report Delay
Nominal Frequency
Lowest Frequency
Highest Frequency
PARAMETER
EAIN
EAIN
Normal Mode
Shutdown
Ramping Negative
Ramping Positive
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)
I
V
V
PGOOD Goes Low After V
After V
V
V
V
CONDITIONS
PGOOD
FCB
CC
CC
RUN/SS
RUN/SS
RUN/SS
RUN/SS
RUN/SS
EAIN
LOAD
LOAD
LOAD
LOAD
PGOOD
EAIN
PLLFLTR
PLLFLTR
PLLFLTR
Lowered Until the RUN/SS Pin is Pulled Low
= 5V
= 0.65V
A
= 0.375V, V
with Respect to Set Output Voltage,
= 3300pF
= 3300pF
= 3300pF
= 3300pF
EAIN
= 25°C. V
= 2mA
, Ramping Positive
, Ramping Positive Until Short-Circuit
, Ramping Negative
= 5V
+
–
= 0V
= 1.9V
, SENSE1
= 1.2V
= 0V
= 2.4V
All Equal 1.2V; Current at Each Pin
is Forced Outside the PGOOD Thresholds
The
SENSEMAX
LOAD
LOAD
●
RUN/SS
CC
–
, SENSE2
denotes the specifications which apply over the full operating
= V
= 3300pF Each Driver
= 3300pF Each Driver
EAIN
≤ 30mV
= 4.5V
RUN/SS
UVDLY
= 0.375V, V
+
, SENSE2
Delay
= 5V unless otherwise noted.
RUN/SS
–
, SENSE3
= 4.5V
+
V
CC
–0.8
1.13
MIN
190
360
600
3.3
–5
–7
95
1
– 1.5 V
7
CC
1.18
–1.5
–1.5
98.5
110
–10
100
400
225
680
3.8
0.2
2.3
1.5
3.8
3.2
1.5
0.1
50
13
30
40
30
20
50
60
TYP
0.2
10
– 0.7 V
LTC3731H
1.23
– 2.5
CC
–13
100
150
440
260
750
4.5
3.5
1.9
4.5
0.3
90
90
90
90
50
20
MAX
5
1
13
0.7
– 0.3
UNITS
3731hfa
3
kHz
kHz
kHz
mA
µA
nA
µA
µA
µA
µA
µA
µA
ns
ns
ns
ns
ns
ns
ns
µs
%
%
%
V
V
V
V
V
V
V