ltc1709-85 Linear Technology Corporation, ltc1709-85 Datasheet - Page 3

• Manufacturer Part Number: ltc1709-85
• Description: 2-phase, 5-bit Vid, Current Mode, High Efficiency, Synchronous Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL
I
I
V
V
I
I
I
DF
TG1, 2 t
TG1, 2 t
BG1, 2 t
BG1, 2 t
TG/BG t
BG/TG t
t
Internal V
V
V
V
V
V
VID Parameters
V
R
ATTEN
R
VID
VID
VID
Oscillator and Phase-Locked Loop
f
f
f
R
I
R
Q
RUN/SS
SCL
SDLHO
SENSE
ON(MIN)
NOM
LOW
HIGH
PLLFLTR
RUN/SS
RUN/SSLO
INTVCC
LDO
LDO
EXTVCC
LDOHYS
BIAS
ATTEN
PULLUP
PLLIN
RELPHS
MAX
THLOW
THHIGH
LEAK
INT
EXT
ERR
1D
2D
r
f
r
f
CC
Regulator
PARAMETER
Input DC Supply Current
Soft-Start Charge Current
RUN/SS Pin ON Arming
RUN/SS Pin Latchoff Arming
RUN/SS Discharge Current
Shutdown Latch Disable Current
Total Sense Pins Source Current
Maximum Duty Factor
Top Gate Transition Time:
Rise Time
Fall Time
Bottom Gate 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
Operating Supply Voltage Range
Resistance Between ATTENIN
and ATTENOUT Pins
Resistive Divider Error
VID25mV to VID3 Pull-Up Resistance
VID25mV to VID3 Logic Threshold Low V
VID25mV to VID3 Logic Threshold High V
VID25mV to VID3 Leakage
Nominal Frequency
Lowest Frequency
Highest Frequency
PLLIN Input Resistance
Phase Detector Output Current
Controller 2-Controller 1 Phase
Normal Mode
Shutdown
Sinking Capability
Sourcing Capability
CC
CC
CC
CC
Load Regulation
Voltage Drop
Switchover Voltage
Switchover Hysteresis
CC
Voltage
CONDITIONS
(Note 5)
EXTV
V
V
V
V
Soft Short Condition V
V
Each Channel: V
In Dropout
(Note 6)
C
C
(Note 6)
C
C
C
C
Tested with a Square Wave (Note 7)
6V < V
I
I
I
I
V
(Note 8)
V
V
V
V
f
f
CC
CC
CC
CC
PLLIN
PLLIN
RUN/SS
RUN/SS
RUN/SS
RUN/SS
EAIN
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
BIAS
BIAS
BIAS
BIAS
PLLFLTR
PLLFLTR
PLLFLTR
= 0 to 20mA, V
= 20mA, V
= 20mA, EXTV
= 20mA, EXTV
A
CC
= 0.5V
= 3.3V
= 3.3V
= 3.3V
< VID25mV–VID3 < 7V
< f
> f
= 25 C. V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver (Note 6)
= 3300pF Each Driver (Note 6)
IN
Tied to V
= 0V
= 1.9V
Rising
Rising from 3V
OSC
OSC
< 30V, V
= 1.2V
= 0V
2.4V
The
EXTVCC
SENSE1
IN
OUT
EXTVCC
CC
CC
EXTVCC
denotes the specifications which apply over the full operating
= 15V, V
, V
Ramping Positive
Ramping Negative
= 5V
EAIN
–
OUT
, 2
= 4V
= 4V
– = V
= 0.5V, V
= 5V
BIAS
SENSE1
= 3.3V, V
RUN/SS
+
, 2
+ = 0V
= 4.5V
RUN/SS
= 5V unless otherwise noted.
– 0.25
– 0.5
MIN
– 85
190
120
280
1.0
0.5
4.8
4.5
2.7
98
2
LTC1709-85
–1.2
99.5
TYP
– 60
– 15
470
180
220
140
310
180
1.5
4.1
1.6
5.0
0.2
4.7
0.2
30
40
30
20
90
90
20
80
10
40
50
2
15
MAX
0.25
160
250
160
360
1.9
4.5
5.2
1.0
5.5
0.8
40
90
90
90
90
4
5
1
UNITS
170985f
3
Deg
kHz
kHz
kHz
mV
k
k
k
ns
ns
ns
ns
ns
ns
ns
%
%
%
A
A
A
V
V
A
A
A
V
V
V
V
V
V
A
A
A