LTC1628 LINER [Linear Technology], LTC1628 Datasheet - Page 3

• Manufacturer Part Number: LTC1628
• Description: High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
V
DF
I
V
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
V
Oscillator
f
f
f
I
3.3V Linear Regulator
V
V
V
PGOOD Output (LTC1628-PG Only)
V
I
V
SYMBOL
FLTCPL
RUN/SS1, 2
SCL1, 2
SDLHO
ON(MIN)
OSC
LOW
HIGH
FREQSET
PGOOD
STBYMD
FLTCPL
RUN/SS1, 2
RUN/SS1, 2
SENSE(MAX)
INTVCC
LDO
LDO
LDO
EXTVCC
LDOHYS
3.3OUT
3.3IL
3.3VL
PGL
PG
MAX
CC
INT
EXT
EXT-PG
1D
2D
Linear Regulator
r
f
r
f
KA
ON RUN/SS Pin ON Threshold
LT RUN/SS Pin Latchoff Arming Threshold V
PARAMETER
Keep-Alive Power On-Threshold
Maximum Duty Factor
V
LTC1628 Only
Fault Coupling Threshold;
LTC1628 Only
Soft-Start Charge Current
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
Internal V
INTV
EXTV
EXTV
EXTV
EXTV
Oscillator frequency
Lowest Frequency
Highest Frequency
FREQSET Input Current
3.3V Regulator Output Voltage
3.3V Regulator Load Regulation
3.3V Regulator Line Regulation
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
FLTCPL
CC
CC
CC
CC
CC
Load Regulation
Input Current
Voltage Drop
Voltage Drop
Switchover Voltage
Hysteresis
CC
Voltage
CONDITIONS
V
In Dropout
0.5V > V
INTV
For FCB Signal and Individual Overcurrent
Faults to Affect Both Controllers
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)
6V < V
I
I
I
I
V
V
V
V
No Load
I
6V < V
I
V
V
CC
CC
CC
CC
3.3
PGOOD
STBYMD
RUN/SS1, 2
RUN/SS1,
RUN/SS1,
RUN/SS1, 2
OSENSE1, 2
OSENSE1, 2
OSENSE1, 2
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
FREQSET
FREQSET
FREQSET
FREQSET
PGOOD
OSENSE
V
V
A
OSENSE
OSENSE
= 0 to 20mA, V
= 20mA, V
= 20mA, V
= 20mA, EXTV
= 0 to 10mA
= 25 C. V
CC
IN
IN
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
= 2mA
– 0.5V < V
= 5V
FLTCPL
Respect to Set Output Voltage
< 30V, V
Ramping Up, RUN
= Open (Note 7)
= 0V
= 2.4V
= 0V
< 30V
V
V
The
Ramping Negative
Ramping Positive
RUN/SS2
RUN/SS2
= 4.5V
= 0.5V
= 0.7V,V
= 0.7V,V
= 1.9V
EXTVCC
EXTVCC
IN
denotes the specifications which apply over the full operating
EXTVCC
= 15V, V
CC
FLTCPL
EXTVCC
Rising
Rising from 3V
SENSE1 – , 2 –
SENSE1 – , 2 –
Ramping Positive
= 5V, LTC1628
= 5V, LTC1628-PG
OSENSE1, 2
= 4V
< INTV
= 4V
RUN/SS1, 2
SS1, 2
= 5V
= 5V, LTC1628 Only
CC
= 0.5V;
= 0V
LTC1628/LTC1628-PG
= 5V unless otherwise noted.
3.25
MIN
190
120
280
0.5
1.0
0.5
4.8
4.5
– 6
98
62
65
6
99.4
3.35
0.05
–7.5
TYP
180
120
220
140
310
1.5
1.2
1.5
4.1
1.6
5.0
0.2
4.7
0.2
0.5
0.1
– 3
75
75
50
50
40
40
90
90
80
– 2
7.5
2
2
3
MAX
3.45
– 9.5
240
160
250
160
360
1.9
4.5
5.2
1.0
0.2
0.3
– 1
88
85
90
90
90
80
9.5
2
4
5
2
1
UNITS
3
kHz
kHz
kHz
mV
mV
mV
mV
ns
ns
ns
ns
ns
ns
ns
%
%
%
%
%
%
V
A
A
V
A
V
V
A
A
V
V
V
A
V
V
A