LTC3728LCGN#TR Linear Technology, LTC3728LCGN#TR Datasheet - Page 4

• Manufacturer Part Number: LTC3728LCGN#TR
• Description: IC REG SW DUAL 2PH STPDWN 28SSOP
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3728LCGN#TR

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 7 V
• Current - Output: 3A
• Frequency - Switching: 250kHz ~ 550kHz
• Voltage - Input: 4.5 ~ 28 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

ELECTRICAL CHARACTERISTICS
LTC3728L/LTC3728LX
temperature range, otherwise specifi cations are at T
SYMBOL
Main Control Loops
V
I
V
V
g
g
I
V
I
V
UVLO
V
I
DF
I
V
V
I
I
V
TG1, 2 t
TG1, 2 t
BG1, 2 t
BG1, 2 t
TG/BG t
BG/TG t
t
4
VOSENSE1, 2
Q
FCB
SENSE
RUN/SS1, 2
SCL1, 2
SDLHO
ON(MIN)
m1, 2
mGBW1, 2
OSENSE1, 2
REFLNREG
LOADREG
FCB
BINHIBIT
OVL
RUN/SS1, 2
RUN/SS1, 2
SENSE(MAX)
MAX
1D
2D
r
f
r
f
ON RUN/SS Pin ON Threshold
LT
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifi er g
Transconductance Amplifi er GBW
Input DC Supply Current
Forced Continuous Threshold
Forced Continuous Pin Current
Burst Inhibit (Constant-Frequency)
Threshold
Undervoltage Lockout
Feedback Overvoltage Lockout
Sense Pins Total Source Current
Maximum Duty Factor
Soft-Start Charge Current
RUN/SS Pin Latchoff Arming
Threshold
RUN/SS Discharge Current
Shutdown Latch Disable Current
Maximum Current Sense Threshold
TG Transition Time:
Rise Time
Fall Time
BG Transition Time:
Rise Time
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
(Note 3); I
(Note 3); I
(LTC3728LE/LTC3728LX/LTC3728LI)
(Note 3)
V
(Note 3)
Measured in Servo Loop; ΔI
Measured in Servo Loop; ΔI
I
I
(Note 4)
V
V
V
Measured at FCB Pin
V
Measured at V
(Each Channel); V
In Dropout
V
V
V
Soft-Short Condition V
V
V
V
V
(Note 5)
C
C
(Note 5)
C
C
C
C
Tested with a Square Wave (Note 6)
TH1, 2
TH1, 2
A
IN
IN
RUN/SS1, 2
FCB
IN
RUN/SS1, 2
RUN/SS1,
RUN/SS1,
RUN/SS1, 2
OSENSE1, 2
OSENSE1, 2
OSENSE1, 2
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
= 25°C. V
= 3.6V to 30V (Note 3)
= 15V; EXTV
Ramping Down
= 0.85V
= 1.2V; Sink/Source 5μA (Note 3)
= 1.2V (Note 3)
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
The
V
V
TH1, 2
TH1, 2
= 0V
RUN/SS2
RUN/SS2
= 4.5V
= 0.5V
= 0.7V, V
= 0.7V, V
= 1.9V
l
IN
OSENSE1, 2
Voltage = 1.2V (LTC3728LC)
Voltage = 1.2V
CC
denotes the specifi cations which apply over the full operating
= 15V, V
SENSE1
Tied to V
Rising
Rising from 3V
SENSE1 – , 2 –
SENSE1 – , 2 –
OSENSE1, 2
–
, 2
RUN/SS1, 2
OUT1
TH
TH
– = V
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 2.0V
= 5V
= 5V
; V
SENSE1
= 0.5V;
OUT1
= 5V unless otherwise noted.
+
= 5V
, 2
+ = 0V
●
●
●
●
●
●
●
●
– 0.50
0.792
0.788
0.76
0.84
MIN
–90
0.5
1.0
0.5
98
65
62
0.800
0.800
0.002
0.800
–0.18
– 0.1
0.86
99.4
TYP
450
–60
100
0.1
1.3
4.3
3.5
1.2
1.5
4.1
1.6
– 5
20
75
75
55
55
45
45
80
80
3
2
0.808
0.812
MAX
0.02
–0.5
0.84
–0.1
0.88
4.75
–50
100
100
100
0.5
4.8
2.0
35
85
88
90
4
4
5
mmho
3728lxfe
UNITS
MHz
%/V
mV
mV
nA
μA
μA
μA
μA
μA
μA
μA
ns
ns
ns
ns
ns
ns
ns
%
%
%
V
V
V
V
V
V
V
V