ltc3717-1 Linear Technology Corporation, ltc3717-1 Datasheet - Page 3

• Manufacturer Part Number: ltc3717-1
• Description: Wide Operating Range, No Rsense Step-down Controller For Ddr/qdr Memory Termination
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are T
SYMBOL
V
V
V
V
I
I
V
TG R
TG R
BG R
BG R
TG t
TG t
BG t
BG t
Internal V
V
V
PGOOD Output
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T
dissipation P
Note 3: The LTC3717EUH-1 is tested in a feedback loop that adjusts V
achieve a specified error amplifier output voltage (I
RUN/SS(C)
RUN/SS(D)
FB(UV)
RUN/SS(ON)
RUN/SS(LE)
RUN/SS(LT)
IN(UVLO)
INTVCC
EXTVCC
PGL
V
V
V
V
V
V
V
FB(OV)
LDO(LOADREG)
EXTVCC
EXTVCC(HYS)
FBH
FBL
FB(HYS)
LTC3717EUH-1: T
r
f
r
f
UP
DOWN
UP
DOWN
J
CC
is calculated from the ambient temperature T
Regulator
D
as follows:
PARAMETER
Output Overvoltage Fault Threshold
Output Undervoltage Threshold
RUN Pin Start Threshold
RUN Pin Latchoff Enable
RUN Pin Latchoff Threshold
Soft-Start Charge Current
Soft-Start Discharge Current
V
TG Driver Pull-Up On Resistance
TG Driver Pull-Down On Resistance
BG Driver Pull-Up On Resistance
BG Driver Pull-Down On Resistance
TG Rise Time
TG Fall Time
BG Rise Time
BG Fall Time
Internal V
Internal V
EXTV
EXTV
EXTV
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
IN
Undervoltage Lockout
J
CC
CC
CC
= T
Switchover Voltage
Switch Drop Voltage
Switchover Hysteresis
A
CC
CC
+ (P
Voltage
Load Regulation
D
• 34 C/W)
TH
).
A
and power
A
= 25 C. V
BG Low (Note 5)
CONDITIONS
RUN/SS Pin Rising
RUN/SS Pin Falling
V
V
V
V
TG High (Note 5)
TG Low (Note 5)
BG High (Note 5)
C
C
C
C
6V < V
I
I
I
V
V
V
I
CC
CC
CC
PGOOD
RUN/SS
RUN/SS
IN
IN
LOAD
LOAD
LOAD
LOAD
FB
FB
FB
The
= 0mA to 20mA, V
= 20mA, V
= 20mA, V
Falling
Rising
Rising (0% = 1/3 V
Falling (0% = 1/3 V
Returning (0% = 1/3 V
FB
IN
= 3300pF
= 3300pF
= 3300pF
= 3300pF
CC
= 5mA
= 0V
= 4.5V, V
to
= 15V, unless otherwise noted.
< 30V, V
denotes specifications which apply over the full operating
EXTVCC
EXTVCC
Note 4: The LTC3717EUH-1 is guaranteed to meet performance
specifications from 0 C to 70 C. Specifications over the –40 C to 85 C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 5: R
test.
FB
EXTVCC
= 0V
Rising
= 5V
EXTVCC
REF
REF
= 4V
DS(ON)
)
)
REF
= 4V
)
limit guaranteed by design and/or correlation to static
– 0.5
MIN
0.8
0.8
4.7
4.5
– 8
8
8
–1.2
– 0.1
0.15
TYP
– 25
– 10
150
200
1.5
3.5
1.8
3.4
3.5
4.7
20
20
20
20
10
10
4
2
2
3
1
5
1
LTC3717-1
MAX
– 12
300
4.5
4.2
3.9
4.0
5.3
0.4
– 3
12
12
2
3
2
2
sn37171 37171fs
UNITS
3
mV
mV
ns
ns
ns
ns
%
%
%
%
%
%
V
V
V
A
A
V
V
V
V
V