LTC3727-1 Linear Technology, LTC3727-1 Datasheet - Page 3

• Manufacturer Part Number: LTC3727-1
• Description: 2-Phase Synchronous Step-Down Switching Regulators
• Manufacturer: Linear Technology

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL
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
INTV
V
V
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
R
I
Q
FCB
SENSE
RUN/SS1, 2
SCL1, 2
SDLHO
ON(MIN)
NOM
LOW
HIGH
PLLFLTR
mGBW1, 2
FCB
BINHIBIT
OVL
RUN/SS1, 2
RUN/SS1, 2
SENSE(MAX)
INTVCC
LDO
LDO
EXTVCC
LDOHYS
PLLIN
MAX
CC
INT
EXT
1D
2D
Linear Regulator
r
f
r
f
ON RUN/SS Pin ON Threshold
LT RUN/SS Pin Latchoff Arming Threshold V
PARAMETER
Transconductance Amplifier 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 Discharge Current
Shutdown Latch Disable Current
Maximum Current Sense Threshold
TG Transition Time:
BG Transition 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
Internal V
INTV
EXTV
EXTV
EXTV
Nominal Frequency
Lowest Frequency
Highest Frequency
PLLIN Input Resistance
Phase Detector Output Current
Normal Mode
Shutdown
Rise Time
Fall Time
Rise Time
Fall Time
Sinking Capability
Sourcing Capability
CC
CC
CC
CC
Load Regulation
Voltage Drop
Switchover Voltage
Hysteresis
CC
Voltage
CONDITIONS
I
(Note 5)
V
V
V
Measured at FCB pin
V
Measured at V
(Each Channel) V
In Dropout
V
V
Soft-Short Condition V
V
V
V
V
(Note 6)
C
C
(Note 6)
C
C
C
C
Tested with a Square Wave (Note 7)
8.5V < V
I
I
I
V
V
V
f
f
TH1, 2
CC
CC
CC
PLLIN
PLLIN
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
PLLFLTR
PLLFLTR
PLLFLTR
A
= 15V, EXTV
= 0mA to 20mA, V
= 20mA, V
= 20mA, EXTV
Ramping Down
= 25 C. V
= 0.85V
< f
> f
= 1.2V (Note 4)
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
IN
OSC
OSC
= 1.2V
= 0V
V
V
The
< 30V, V
RUN/SS2
RUN/SS2
2.4V
= 0V
= 4.5V (LTC 3727 Only)
= 0.5V (LTC3727 Only)
= 0.7V,V
= 0.7V,V
= 1.9V
EXTVCC
OSENSE1, 2
IN
CC
SENSE1
denotes the specifications which apply over the full operating
= 15V, V
CC
Tied to V
EXTVCC
Rising
Rising from 3V (LTC3727 Only)
SENSE1 – , 2 –
SENSE1 – , 2 –
Ramping Positive
= 8.5V
EXTVCC
OSENSE1, 2
–
, 2
= 6V
– = V
RUN/SS1, 2
OUT1
= 6V
= 12V
= 12V
, V
SENSE1
= 0.5V,
OUT1
+
= 5V unless otherwise noted.
, 2
= 8.5V
+ = 0V
LTC3727/LTC3727-1
– 0.30
MIN
0.76
0.84
– 85
115
105
350
220
460
0.5
1.0
0.5
7.2
6.9
98
www.DataSheet4U.com
– 0.18
0.800
0.86
99.4
TYP
– 60
670
135
135
180
380
255
530
–15
6.8
3.5
1.2
1.5
4.1
1.6
7.5
0.2
7.3
0.3
20
50
50
40
40
90
90
70
50
3
2
15
– 0.05
MAX
0.84
0.88
155
165
160
430
290
580
7.3
1.9
4.5
7.8
1.0
35
90
90
90
80
4
4
5
UNITS
3
MHz
3727f
kHz
kHz
kHz
mV
mV
mV
k
ns
ns
ns
ns
ns
ns
ns
%
%
A
A
V
A
V
V
V
A
A
V
V
A
A
V
V
V
A
A