Datasheet
3
LTC3701
3701fa
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
IN
= 4.2V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Oscillator and Phase-Locked Loop
Oscillator Frequency V
PLLLPF
= 1.2V or Floating 500 550 600 kHz
V
PLLLPF
= 0V 230 280 320 kHz
V
PLLLPF
≥ 2.4V 690 775 890 kHz
Phase Detector Output Current
Sinking f
EXTCLK/MODE
< f
OSC
–5 µA
Sourcing f
EXTCLK/MODE
> f
OSC
5 µA
PGOOD Output
PGOOD Voltage Low I
PGOOD
= 500µA 70 150 mV
PGOOD Trip Level V
FB
with Respect to Set Output Voltage
V
FB
Ramping Positive –15 –8 –2.5 %
V
FB
Ramping Negative 2.5 8 15 %
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 T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
• θ
JA
°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 I
TH/RUN
to a
specified voltage and measures the resultant V
FB
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
UW
Reference Voltage vs Temperature
TEMPERATURE (°C)
–60
REFERENCE VOLTAGE (V)
0.795
0.800
0.805
60
3701 G01
0.790
0.785
–20 20
–40 80
0 40 100
0.780
0.775
0.810
V
IN
= 4.2V
TEMPERATURE (°C)
–60
I
TH
/RUN VOLTAGE (V)
0.38
0.44
0.50
0 40 100
3701 G02
0.32
0.26
0.36
0.42
0.48
0.30
0.24
0.34
0.40
0.46
0.28
0.22
0.20
–40 –20
20
60 80
V
IN
= 4.2V
TEMPERATURE (°C)
–60
0
FREQUENCY (kHz)
100
300
400
500
1000
700
–20
20
40
3701 G03
200
800
900
600
–40 0
60
80
100
V
IN
= 4.2V
PLLLPF = 2.4V
PLLLPF = 0V
PLLLPF = FLOAT
Shutdown Threshold
vs Temperature
Oscillator Frequency
vs Temperature