LTC1698E View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1698E Datasheet PDF : 24 Pages
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LTC1698
ELECTRICAL CHARACTERISTICS The q indicates specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VDD = 8V, unless otherwise noted. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
VAUX
VAUX Auxiliary Supply Voltage
Current Limit Amplifier
CVAUX = 0.1µF, ILOAD = 0mA to 10mA, VDD = 7V to 12.6V q 3.135 3.320 3.465
V
IISNSGND
IISNS
VILIMTH
IICOMP
ISNSGND Input Current
ISNS Input Current
Current Limit Threshold
(VISNS – VISNSGND)
ICOMP Source Current
ICOMP Sink Current
VISNSGND = 0V
VISNS = 0V
VICOMP = 2.5V, VISNSGND = 0V
q
0.05
1
µA
q
0.05
1
µA
– 27.0 – 25 – 23.0
mV
q – 27.5 – 25 – 22.5
mV
VISNSGND = 0V, VISNS = – 0.3V, VICOMP = 2.5V (Note 8)
– 280 – 200 – 120
µA
q – 370 – 200 – 80
µA
VISNSGND = 0V, VISNS = 0.3V, VICOMP = 2.5V (Note 8)
120 200 280
µA
q 80 200 370
µA
gmILIM Current Limit Amplifier
Transconductance
VISNSGND = 0V, VICOMP = 2.5V, IICOMP = ±10µA
q 2.2 3.5
5 millimho
GICOMP Current Limit Amplifier
Open-Loop DC Gain
VICOMP = 2.5V, No Load
q 48
60
dB
PWRGD and OVP Comparators
VPWRGD Percent Below VFB
IPWRGD Power Good Sink Current
VOL
VOVPREF
IOVPIN
tPWRGD
Power Good Output Low Voltage
OVPIN Threshold
OVPIN Input Bias Current
Power Good Response Time
Power Bad Response Time
tOVP Overvoltage Response Time
SYNC and Drivers
VFB ↓, MARGIN = Open (Note 9)
VFB = 2V
VFB = 0V
IPWRGD = 3mA, VFB = 0V
VFB = VISNS = VISNSGND = 0V, OVPIN ↑ (Note 9)
VOVPIN = 1.233V
VFB ↑
VFB ↓
VOVPIN ↑, COPTODRV = 0.1µF
q –9
–6
–3
%
q
q 10
10
µA
mA
q
0.4
V
q 1.18 1.233 1.28
V
q
0.1
1
µA
q1
2
5
ms
q 0.5
1
2.5
ms
q
5
20
µs
VPT
SYNC Input Positive Threshold
q1
1.6 2.2
V
VNT
SYNC Input Negative Threshold
q – 2.2 –1.6 –1
V
ISYNC SYNC Input Current
VSYNC = ±10V
q
1
50
µA
fSYNC SYNC Frequency Range
CFG = CCG = 1000pF, VSYNC = ±5V
q 50
400
kHz
td
SYNC Input to Driver Output Delay CFG = CCG = 1000pF, fSYNC = 100kHz, VSYNC = ±5V
q
40
90
ns
tSYNC Minimum SYNC Pulse Width
fSYNC = 100kHz, VSYNC = ±10V (Note 6)
q 75
ns
tr, tf
Driver Rise and Fall Time
CFG = CCG = 1000pF, fSYNC = 100kHz, VSYNC = ±5V,
q
10% to 90%
10
40
ns
tDDIS Driver Disable Time-Out
CFG = CCG = 1000pF, fSYNC = 100kHz, VSYNC = ±5V
Measured from CG ↑ (Note 10)
q 10
15
20
µs
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired. All voltages refer to GND.
Note 2: The LTC1698 incorporates a 5V linear regulator to power internal
circuitry. Driving these pins above 5.3V may cause excessive current flow.
Guaranteed by design and not subject to test.
Note 3: The LTC1698E 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. For guaranteed performance to
specifications over the –40°C to 85°C range, the LTC1698I is available.
Note 4: All currents into device pins are positive; all currents out of the
device pins are negative. All voltages are referenced to ground unless
otherwise specified. For applications with VDD < 7V, refer to the Typical
Performance Characteristics.
Note 5: Supply current in active operation is dominated by the current
needed to charge and discharge the external FET gates. This will vary with
the LTC1698 operating frequency, supply voltage and the external FETs
used.
Note 6: This parameter is guaranteed by correlation and is not tested.
Note 7: VFB is tested in an op amp feedback loop which servos VFB to the
internal bandgap voltage.
Note 8: The current comparator output current varies linearly with
temperature.
Note 9: The PWRGD and OVP comparators incorporate 10mV of
hysteresis.
Note 10: The driver disable time-out is proportional to the SYNC period
within the frequency synchronization range.
1698f
3
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