Datasheet

LTC3415
3
3415fa
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 LTC3415E 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.
Note 3: The LTC3415 is tested in a feedback loop that adjusts V
FB
to
achieve a specifi ed error amplifi er output voltage (I
TH
).
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T
J
is calculated from the ambient temperature T
A
and power
dissipation as follows: LTC3415: T
J
= T
A
+ P
D
(34°C/W).
Note 6: Current Limit is measured with internal servo loop while forcing
V
ITH
= 1V.
Note 7: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.3V unless otherwise specifi ed.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Input DC Bias Current
Active Current
Sleep
Shutdown
(Note 4)
V
FB
= 0.57V, MODE = 0V
V
FB
= 0.63V, MODE = V
IN
V
RUN
= 0V
1350
450
0.2 5
μA
μA
μA
f
OSC
Switching Frequency 1.3 1.5 1.7 MHz
f
SYNC
SYNC Capture Range 0.75 2.25 MHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 100mA 32 40 mΩ
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= 100mA 25 32 mΩ
I
LIMIT
Peak Current Limit V
ITH
= 1V (Note 6) 11 13 15 A
V
UVLO
Undervoltage Lockout Threshold SV
IN
Rising
SV
IN
Falling
2.05
1.85
2.2
2.0
2.35
2.15
V
V
I
LSW
SW Leakage Current V
RUN
= 0V, V
IN
= 5.5V 0.1 5 μA
SS Delay Internal Soft-Start Delay 140 μs
g
m
Error Amplifi er’s Transconductance 1.7 2 2.2 mmho
RUN Run Input Threshold RUN Rising
RUN Falling
1.4
1.2
1.5
1.3
1.6
1.4
V
V
PGOOD Delay PGOOD Falling Edge Delay 35 μs
%
MARGINING
Output Voltage Margining Percentage MGN HI, BSEL LOW
MGN HI, BSEL HI
MGN HI, BSEL = SV
IN
/2
MGN LOW, BSEL LOW
MGN LOW, BSEL HI
MGN LOW, BSEL = SV
IN
/2
3
8
13
–3
–8
–13
5
10
15
–5
–10
–15
7
12
17
–7
–12
–17
%
%
%
%
%
%
TRACK Tracking Threshold (Rising)
Tracking Threshold (Falling)
Tracking Disable Threshold
RUN = V
IN
RUN = 0V
0.57
0.18
V
IN
– 0.5
V
V
V
V
FB
Slavemode V
FB
Slavemode (EA Disable) Threshold V
IN
– 0.5 V
I
TH
Internal Switch Over Threshold for Internal
Compensation
V
IN
– 0.5 V
OV Output Overvoltage Threshold V
FB
Rising 7 10 13 %
UV Output Undervoltage Threshold V
FB
Falling –7 –10 –13 %
V
HYST
OV/UV Hysteresis V
FB
Returning to Regulation 1 3 %