LTC1699 Series
3
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. 2.7V ≤ V
CC
≤ 5.5V (Notes 3, 4) unless otherwise stated.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
SK1
SDA, PGOOD, CPU_ON, IO_ON, 0 ≤ V
PIN
≤ 2.7V ● 51960 mA
CLK_ON Sink Current at V
CC
= 2.7V
I
SK2
SDA, PGOOD, CPU_ON, IO_ON, 0 ≤ V
PIN
≤ 5.5V ● 35 65 150 mA
CLK_ON Sink Current at V
CC
= 5.5V
I
LKG
PGOOD, CPU_ON, IO_ON, 0 ≤ V
PIN
≤ 5.5V ● ±2 µA
CLK_ON Leakage Current
I
PU
VRON Pull-Up Current V
PIN
= 0 ● –1 –2.5 –7 µA
Timing (Note 5)
f
SMB
SMBus Operating Frequency ● 10 100 KHz
t
BUF
Bus Free Time Between Stop/Start ● 4.7 µs
t
HD:STA
Hold Time After (Repeated) Start ● 4.0 µs
t
SU:STA
Repeated Start Setup Time ● 4.7 µs
t
SU:STO
Stop Condition Setup Time ● 4.0 µs
t
HD:DAT
Data Hold Time ● 300 ns
t
SU:DAT
Data Setup Time ● 250 ns
t
LOW
Clock Low Period ● 4.7 µs
t
HIGH
Clock High Period ● 4.0 µs
t
f
SCL, SDA Fall Time 0.9V
CC
to 0.65V ● 300 ns
t
r
SCL, SDA Rise Time 0.65V to 2.25V ● 1000 ns
t
SSH
SEL to SENSE High (Note 6) Toggle SEL to Switch from Min V
OUT
to Max V
OUT
, 500 ns
VFB = 0.8V
t
SSL
SEL to SENSE Low (Note 6) Toggle SEL to Switch from Max V
OUT
to Min V
OUT
, 500 ns
VFB = 0.8V
t
SPL
SEL Toggling to PGOOD Low Toggle SEL to Select New Code ● 160 500 ns
C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1
t
PH
Stop Bit to CPU_ON, IO_ON C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1 ● 2 µs
or CLK_ON High (Note 7)
t
PL
Stop Bit to CPU_ON, IO_ON C
L
= 0.1µF, 10kΩ Pull-Up, S1 in Figure 1 ● 20 50 µs
or CLK_ON Low (Note 7)
t
PPL
Stop Bit to PGOOD Low (Note 6) C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1 ● 250 ns
t
VH
VRON High to CPU_ON, IO_ON C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1 ● 2 µs
or CLK_ON High
t
VL
VRON Low to CPU_ON, IO_ON, C
L
= 0.1µF, 10kΩ Pull-Up, S1 in Figure 1 ● 50 µs
CLK_ON Low
t
VPL
VRON Low to PGOOD Low C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1 ● 130 500 ns
t
PGL
PGOOD Low Duration C
L
= 100pF, 10kΩ Pull-Up, S2 in Figure 1 ● 30 50 70 µs
Note1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1699-80E, LTC1699-81E and LTC1699-82E are
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: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 4: All typical numbers are given for V
CC
= 5V and T
A
= 25°C.
Note 5: These parameters are guaranteed by design and are not tested in
production. SMBus timing is referenced to V
IL
and V
IH
levels.
Note 6: Dominated by the switching regulator. The delay due to the
LTC1699-80, LTC1699-81 or LTC1699-82 is typically 500ns.
Note 7: Measured from the rising edge of SDA during Data High
acknowledgement.
