Datasheet

LT3684
3
3684f
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Bias Voltage 2.7 3 V
Feedback Voltage
●
1.25
1.24
1.265
1.265
1.28
1.29
V
V
FB Pin Bias Current (Note 3)
●
30 100 nA
FB Voltage Line Regulation 4V < V
IN
< 34V 0.002 0.02 %/V
Error Amp g
m
330 µMho
Error Amp Gain 1000
V
C
Source Current 75 µA
V
C
Sink Current 100 µA
V
C
Pin to Switch Current Gain 3.5 A/V
V
C
Clamp Voltage 2V
Switching Frequency R
T
= 8.66k
R
T
= 29.4k
R
T
= 187k
2.7
1.25
250
3.0
1.4
300
3.3
1.55
350
MHz
MHz
kHz
Minimum Switch Off-Time
●
100 150 nS
Switch Current Limit Duty Cycle = 5% 3.1 3.6 4.0 A
Switch V
CESAT
I
SW
= 2A 360 mV
Boost Schottky Reverse Leakage V
SW
= 10V, V
BIAS
= 0V 0.02 2 µA
Minimum Boost Voltage (Note 4)
●
1.6 2.1 V
BOOST Pin Current I
SW
= 1A 18 30 mA
RUN/SS Pin Current V
RUN/SS
= 2.5V 5 10 µA
RUN/SS Input Voltage High 2.5 V
RUN/SS Input Voltage Low 0.2 V
PG Threshold Offset from Feedback Voltage V
FB
Rising 100 mV
PG Hysteresis 10 mV
PG Leakage V
PG
= 5V 0.1 1 µA
PG Sink Current V
PG
= 0.4V
●
100 300 µA
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: The LT3684E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3684I specifi cations are
guaranteed over the –40°C to 125°C temperature range.
Note 3: Bias current measured in regulation. Bias current fl ows into the FB
pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 10V, V
RUNS/SS
= 10V V
BOOST
= 15V, V
BIAS
= 3.3V unless otherwise
noted. (Note 2)
ELECTRICAL CHARACTERISTICS