LTC3415 Datasheet, PDF (3/28 Pages) Linear Technology – 7A, PolyPhase Synchronous Step-Down Regulator

LTC3415
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.3V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
I_Q
f_OSC
f_SYNC
R_PFET
R_NFET
I_LIMIT
V_UVLO
I_LSW
SS Delay
Input DC Bias Current
Active Current
Sleep
Shutdown
Switching Frequency
SYNC Capture Range
R_DS(ON) of P-Channel FET
R_DS(ON) of N-Channel FET
Peak Current Limit
Undervoltage Lockout Threshold
SW Leakage Current
Internal Soft-Start Delay
(Note 4)
V_FB = 0.57V, MODE = 0V
V_FB = 0.63V, MODE = V_IN
V_RUN = 0V
I_SW = 100mA
I_SW = 100mA
V_ITH = 1V (Note 6)
SV_IN Rising
SV_IN Falling
V_RUN = 0V, V_IN = 5.5V
1350
450
0.2
5
1.3
1.5
1.7
0.75
2.25
32
40
25
32
11
13
15
2.05
2.2
2.35
1.85
2.0
2.15
0.1
5
140
g_m
Error Amplifier’s Transconductance
RUN
Run Input Threshold
RUN Rising
RUN Falling
1.7
2
2.2
1.4
1.5
1.6
1.2
1.3
1.4
PGOOD Delay
PGOOD Falling Edge Delay
35
%_MARGINING
TRACK
V_FB Slavemode
I_TH Internal
Output Voltage Margining Percentage
Tracking Threshold (Rising)
Tracking Threshold (Falling)
Tracking Disable Threshold
V_FB Slavemode (EA Disable) Threshold
Switch Over Threshold for Internal
Compensation
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
RUN = V_IN
RUN = 0V
3
5
7
8
10
12
13
15
17
–3
–5
–7
–8
–10
–12
–13
–15
–17
0.57
0.18
V_IN – 0.5
V_IN – 0.5
V_IN – 0.5
OV
UV
V_HYST
Output Overvoltage Threshold
Output Undervoltage Threshold
OV/UV Hysteresis
V_FB Rising
V_FB Falling
V_FB Returning to Regulation
7
10
13
–7
–10
–13
1
3
UNITS
μA
μA
μA
MHz
MHz
mΩ
mΩ
A
V
V
μA
μs
mmho
V
V
μs
%
%
%
%
%
%
V
V
V
V
V
%
%
%
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 specifications
from 0°C to 85°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: The LTC3415 is tested in a feedback loop that adjusts V_FB to
achieve a specified error amplifier 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 specified maximum operating junction
temperature may impair device reliability.
3415fa
3