LTC1909-8 LINER [Linear Technology], LTC1909-8 Datasheet - Page 4

• Manufacturer Part Number: LTC1909-8
• Description: Wide Operating Range,No RSENSE TM Step-Down DC/DC Controller with SMBus Programming
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
LTC1909-8
(SMBus VID Programmer) The
specifications are at T
SYMBOL
I
I
I
I
Timing (Note 7)
f
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1909-8E 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 3: The LTC1909-8 is tested in a feedback loop that adjusts V
achieve a specified error amplifier output voltage (I
Note 4: T
dissipation P
4
SK1
SK2
LKG
PU
SMB
BUF
HD:STA
SU:STA
SU:STO
HD:DAT
SU:DAT
LOW
HIGH
f
r
SSH
SSL
SPL
PH
PL
PPL
VH
VL
VPL
PGL
LTC1909-8E: T
J
is calculated from the ambient temperature T
D
PARAMETER
SDA, PGTMR, CPUON
Sink Current at V
SDA, PGTMR, CPUON
Sink Current at V
PGTMR, CPUON Leakage Current
VRON Pull-Up Current
SMBus Operating Frequency
Bus Free Time Between Stop/Start
Hold Time After (Repeated) Start
Repeated Start Setup Time
Stop Condition Setup Time
Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
SCL, SDA Fall Time
SCL, SDA Rise Time
SEL to V
SEL to V
SEL Toggling to PGTMR Low
Stop Bit to CPUON High (Note 9)
Stop Bit to CPUON Low (Note 9)
Stop Bit to PGTMR Low (Note 9)
VRON High to CPUON High
VRON Low to CPUON Low
VRON Low to PGTMR Low
PGTMR Low Duration
as follows:
J
= T
OSENSE
OSENSE
A
+ (P
A
= 25 C. 2.7V V
D
High (Note 8)
Low (Note 8)
• 130 C/W)
CC
CC
= 2.7V
= 5.5V
denotes the specifications which apply over the full operating temperature range, otherwise
CC
TH
5.5V (Note 5) unless otherwise stated.
).
A
and power
CONDITIONS
0 V
0 V
0 V
V
0.9V
0.65V to 2.25V
Toggle SEL to Switch from 01111B to 10000B,
V
Toggle SEL to Switch from 10000B to 01111B,
Toggle SEL to Select New Code
C
C
C
C
C
C
C
C
V
PIN
FB
L
L
L
L
L
L
L
L
FB
= 100pF, 10k Pull-Up, S2 in Test Circuit
= 100pF, 10k Pull-Up, S2 in Test Circuit
= 0.1 F, 10k Pull-Up, S1 in Test Circuit
= 100pF, 10k Pull-Up, S2 in Test Circuit
= 100pF, 10k Pull-Up, S2 in Test Circuit
= 0.1 F, 10k Pull-Up, S1 in Test Circuit
= 100pF, 10k Pull-Up, S2 in Test Circuit
= 100pF, 10k Pull-Up, S2 in Test Circuit
= 0.8V
CC
= 0.8V
= 0
PIN
PIN
PIN
to 0.65V
FB
to
2.7V
5.5V
5.5V
Note 5: All currents into device pins are positive; all currents out of device pins
are negative. All voltages are referenced to device ground unless otherwise
noted.
Note 6: The divider error is tested in a feedback loop that adjusts FB to
0.8V for each 5-bit code.
Note 7: These parameters are guaranteed by design and are not tested in
production. SMBus timing is referenced to V
Note 8: Dominated by the switching regulator. The delay due to the SMBus
VID programmer is only 500ns typ.
Note 9: Measured from the rising edge of SDA during Data High
acknowledgment.
MIN
300
250
4.7
4.7
4.7
35
–1
10
30
5
4
4
4
IL
and V
– 2.5
TYP
500
500
160
130
19
65
20
50
IH
levels.
MAX
1000
150
100
300
500
250
500
– 7
60
50
50
70
0.2
2
2
UNITS
19098f
KHz
mA
mA
ns
ns
ns
ns
ns
ns
ns
ns
ns
A
A
s
s
s
s
s
s
s
s
s
s
s