LTC3860
4
3860fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations are at T
A
= 25°C (Note 3). V
CC
= 5V, V
RUN1,2
= 5V, V
FREQ
= V
CLKIN
= 0V, V
FB
= 0.6V,
f
OSC
= 0.6MHz unless otherwise specifi ed.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
FREQ
FREQ Pin Output Current V
FREQ
= 0.8V 19 21 23 μA
t
CLKIN(HI)
CLKIN Pulse Width High V
CLKIN
= 0V to 5V 100 ns
t
CLKIN(LO)
CLKIN Pulse Width Low V
CLKIN
= 0V to 5V 100 ns
R
CLKIN
CLKIN Pull-Up Resistance 13 kΩ
V
CLKIN
CLKIN Input Threshold V
CLKIN
Falling
V
CLKIN
Rising
1.2
2
V
V
V
FREQ
FREQ Input Threshold V
CLKIN
= 0V
V
FREQ
Falling
V
FREQ
Rising
1.5
2.5
V
V
V
OL(CLKOUT)
CLKOUT Low Output Voltage I
LOAD
= –500μA 0.2 V
V
OH(CLKOUT)
CLKOUT High Output Voltage I
LOAD
= 500μA V
CC
– 0.2 V
θ
2
-θ
1
Channel 1-to-Channel 2 Phase Relationship V
PHSMD
= 0V
V
PHSMD
= Float
V
PHSMD
= V
CC
180
180
120
Deg
Deg
Deg
θ
CLKOUT
-θ
1
CLKOUT-to-Channel 1 Phase Relationship V
PHSMD
= 0V
V
PHSMD
= Float
V
PHSMD
= V
CC
60
90
240
Deg
Deg
Deg
PWM/PWMEN Outputs
PWM PWM Output High Voltage I
LOAD
= 500μA
l
4.5 V
PWM Output Low Voltage I
LOAD
= –500μA
l
0.5 V
PWM Output Current in Hi-Z State ±5 μA
PWM Maximum Duty Cycle 91.5 %
PWMEN PWMEN Output High Voltage I
LOAD
= 1mA
l
4.5 V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
• θ
JA
)
Note 3: The LTC3860 is tested under pulsed load conditions such that
T
J
≈
T
A
. The LTC3860E is guaranteed to meet performance specifi cations
from 0°C to 85°C junction temperature. Specifi cations over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3860I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The maximum ambient temperature consistent with
these specifi cations is determined by specifi c operating conditions in
conjunction with board layout, the rated package thermal resistors and
other environmental factors.
