LTC3701 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC3701' PDF : 20 Pages View PDF
LTC3701
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 4.2V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
Oscillator and Phase-Locked Loop
Oscillator Frequency
Phase Detector Output Current
Sinking
Sourcing
PGOOD Output
VPLLLPF = 1.2V or Floating
VPLLLPF = 0V
VPLLLPF ≥ 2.4V
fEXTCLK/MODE < fOSC
fEXTCLK/MODE > fOSC
500
550
600
230 280 320
690 775 890
–5
5
PGOOD Voltage Low
PGOOD Trip Level
IPGOOD = 500µA
VFB with Respect to Set Output Voltage
VFB Ramping Positive
VFB Ramping Negative
70
150
–15
–8
– 2.5
2.5
8
15
UNITS
kHz
kHz
kHz
µA
µA
mV
%
%
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3701E 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.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • θJA°C/W)
Note 4: Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
Note 5: The LTC3701 is tested in a feedback loop that servos ITH/RUN to a
specified voltage and measures the resultant VFB voltage.
Note 6: Peak current sense voltage is reduced dependent on duty cycle to
a percentage of value as given in Figure 2.
TYPICAL PERFOR A CE CHARACTERISTICS
Reference Voltage vs Temperature
0.810
VIN = 4.2V
0.805
0.800
0.795
0.790
0.785
0.780
0.775
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3701 G01
Shutdown Threshold
vs Temperature
0.50
0.48 VIN = 4.2V
0.46
0.44
0.42
0.40
0.38
0.36
0.34
0.32
0.30
0.28
0.26
0.24
0.22
0.20
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3701 G02
Oscillator Frequency
vs Temperature
1000
VIN = 4.2V
900
800
PLLLPF = 2.4V
700
600
PLLLPF = FLOAT
500
400
300
PLLLPF = 0V
200
100
0
–60 –40 –20 0 20 40 60 80 100
TEMPERATURE (°C)
3701 G03
3701fa
3
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