LTC1702I 查看數據表（PDF） - Linear Technology
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LTC1702I Datasheet PDF : 36 Pages
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LTC1702
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VCC = 5V unless otherwise specified. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
Switching Characteristics
fOSC
Oscillator Frequency
ΦOSC2
Converter 2 Oscillator Phase
DCMIN1
Minimum Duty Cycle
DCMIN2
Minimum Duty Cycle
DCMAX
Maximum Duty Cycle
tNOV
Driver Nonoverlap
tr, tf
Driver Rise/Fall Time
Feedback Amplifier
Test Circuit 1, CL = 0pF
Relative to Converter 1 (Note 6)
VFB < VMAX
VFB > VMAX
Test Circuit 1, CL = 2000pF (Note 7)
Test Circuit 1, CL = 2000pF (Note 7)
● 475
550
750
180
●
7
10
●
0
● 87
90
93
●
40
100
●
12
80
AVFB
FB DC Gain
GBW
FB Gain Bandwidth
● 74
85
25
IERR
FB Sink/Source Current
VMIN
MIN Comparator Threshold
VMAX
MAX Comparator Threshold
Current Limit Loop
● ±3
± 10
●
760 785
● 815
840
AVILIM
IIMAX
ILIM Gain
IMAX Source Current
Status Outputs
IMAX = 0V, LTC1702C
IMAX = 0V, LTC1702I
● –7
● –7
40
–10 –13
–10 –14
VPGOOD
VOLPG
IPGOOD
tPGOOD
VFAULT
VOLF
IFAULT
tFAULT
PGOOD Trip Point
PGOOD Output Low Voltage
PGOOD Output Leakage
PGOOD Delay Time
FAULT Trip Point
FAULT Output Low Voltage
FAULT Output Current
FAULT Delay Time
VFB Relative to Regulated VOUT
PGOOD = 1mA
VFB < VPGOOD to PGOOD (Note 7)
VFB Relative to Regulated VOUT
IFAULT = 1mA
VFAULT = 0V
VFB > VFAULT to FAULT (Note 7)
● – 10
–5
–2
●
0.03
0.1
●
±0.1
±1
100
● + 10 + 15 + 20
●
0.03
0.1
– 10
25
UNITS
kHz
DEG
%
%
%
ns
ns
dB
MHz
mA
mV
mV
dB
µA
µA
%
V
µA
µs
%
V
µA
µs
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: PVCC and BVCC (VBOOST – VSW) must be greater than VGS(ON) of
the external MOSFETs used to ensure proper operation.
Note 3: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 4: Supply current in normal operation is dominated by the current
needed to charge and discharge the external MOSFET gates. This current
will vary with supply voltage and the external MOSFETs used.
Note 5: Supply current in shutdown is dominated by external MOSFET
leakage and may be significantly higher than the quiescent current drawn
by the LTC1702, especially at elevated temperature.
Note 6: This parameter is guaranteed by correlation and is not tested
directly.
Note 7: Rise and fall times are measured using 10% and 90% levels. Delay
and nonoverlap times are measured using 50% levels.
1702fa
3
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