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| LTC3860_15 Datasheet, PDF (4/36 Pages) Linear Technology – Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing | |||
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LTC3860
ELECTRICAL CHARACTERISTICS The l denotes the speciï¬cations which apply over the full operating
junction temperature range, otherwise speciï¬cations are at TA = 25°C (Note 3). VCC = 5V, VRUN1,2 = 5V, VFREQ = VCLKIN = 0V, VFB = 0.6V,
fOSC = 0.6MHz unless otherwise speciï¬ed.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IFREQ
tCLKIN(HI)
tCLKIN(LO)
RCLKIN
VCLKIN
VFREQ
FREQ Pin Output Current
CLKIN Pulse Width High
CLKIN Pulse Width Low
CLKIN Pull-Up Resistance
CLKIN Input Threshold
FREQ Input Threshold
VOL(CLKOUT)
VOH(CLKOUT)
θ2-θ1
CLKOUT Low Output Voltage
CLKOUT High Output Voltage
Channel 1-to-Channel 2 Phase Relationship
θCLKOUT-θ1 CLKOUT-to-Channel 1 Phase Relationship
PWM/PWMEN Outputs
VFREQ = 0.8V
VCLKIN = 0V to 5V
VCLKIN = 0V to 5V
VCLKIN Falling
VCLKIN Rising
VCLKIN = 0V
VFREQ Falling
VFREQ Rising
ILOAD = â500μA
ILOAD = 500μA
VPHSMD = 0V
VPHSMD = Float
VPHSMD = VCC
VPHSMD = 0V
VPHSMD = Float
VPHSMD = VCC
19
21
23
μA
100
ns
100
ns
13
kΩ
1.2
V
2
V
1.5
V
2.5
V
0.2
V
VCC â 0.2
V
180
Deg
180
Deg
120
Deg
60
Deg
90
Deg
240
Deg
PWM
PWMEN
PWM Output High Voltage
PWM Output Low Voltage
PWM Output Current in Hi-Z State
PWM Maximum Duty Cycle
PWMEN Output High Voltage
ILOAD = 500μA
ILOAD = â500μA
ILOAD = 1mA
l 4.5
V
l
0.5
V
±5
μA
91.5
%
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: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD ⢠θJA)
Note 3: The LTC3860 is tested under pulsed load conditions such that
TJ â TA. The LTC3860E is guaranteed to meet performance speciï¬cations
from 0°C to 85°C junction temperature. Speciï¬cations over the â40°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 â40°C to 125°C operating junction
temperature range. The maximum ambient temperature consistent with
these speciï¬cations is determined by speciï¬c operating conditions in
conjunction with board layout, the rated package thermal resistors and
other environmental factors.
3860fc
4
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