LTC3707 Linear Technology, LTC3707 Datasheet - Page 3

• Manufacturer Part Number: LTC3707
• Description: High Efficiency / 2-Phase Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
V
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
f
f
f
I
3.3V Linear Regulator
V
V
V
PGOOD Output
V
I
V
SYMBOL
RUN/SS1, 2
SCL1, 2
SDLHO
ON(MIN)
OSC
LOW
HIGH
FREQSET
PGOOD
STBYMD
RUN/SS1, 2
RUN/SS1, 2
SENSE(MAX)
INTVCC
LDO
LDO
EXTVCC
LDOHYS
3.3OUT
3.3IL
3.3VL
PGL
PG
MAX
CC
INT
EXT
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
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
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
CC
CC
CC
CC
Load Regulation
Voltage Drop
Switchover Voltage
Hysteresis
CC
Voltage
CONDITIONS
V
In Dropout
V
V
Soft Short Condition V
V
V
V
(Note 6)
C
C
(Note 6)
C
C
C
C
Tested with a Square Wave (Note 7)
6V < V
I
I
I
V
V
V
V
No Load
I
6V < V
I
V
V
CC
CC
CC
3.3
PGOOD
STBYMD
RUN/SS1, 2
RUN/SS1,
RUN/SS1,
RUN/SS1, 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, EXTV
= 0 to 10mA
= 25 C. V
IN
IN
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
= 2mA
= 5V
Respect to Set Output Voltage
< 30V, V
Ramping Up, RUN
= Open (Note 8)
= 0V
= 2.4V
= 0V
< 30V
V
V
The
Ramping Negative
Ramping Positive
RUN/SS2
RUN/SS2
= 4.5V
= 0.5V
= 0.7V,V
= 1.9V
EXTVCC
IN
denotes the specifications which apply over the full operating
EXTVCC
= 15V, V
CC
EXTVCC
Rising
Rising from 3V
SENSE1 – , 2 –
Ramping Positive
= 5V
OSENSE1, 2
= 4V
= 4V
RUN/SS1, 2
SS1, 2
= 5V
= 0.5V;
= 0V
= 5V unless otherwise noted.
3.20
MIN
190
120
280
0.5
1.0
0.5
4.8
4.5
– 6
98
65
62
6
99.4
3.35
0.05
–7.5
TYP
180
100
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
75
75
60
60
50
50
80
80
– 2
7.5
2
LTC3707
MAX
4.75
3.45
– 9.5
110
110
110
100
200
250
160
360
2.0
5.2
2.0
0.2
0.3
– 1
85
88
9.5
2
4
5
2
1
UNITS
3
3707f
kHz
kHz
kHz
mV
mV
mV
ns
ns
ns
ns
ns
ns
ns
%
%
%
%
%
%
V
A
V
V
A
A
V
V
V
A
V
V
A