LTC3605 LINER [Linear Technology], LTC3605 Datasheet - Page 3

• Manufacturer Part Number: LTC3605
• Description: 20V, 5A Synchronous Step-Down Regulator
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
SYMBOL
I
R
R
V
V
V
DV
OV
UV
DV
R
I
I
f
CLKIN
V
temperature range, otherwise specifications are at T
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. Absolute Maximum Ratings are those values
beyond which the life of a device may be impaired.
Note 2: The LTC3605A is tested under pulsed load conditions such that
T
from 0°C to 85°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3605AI (I-grade) is guaranteed over the full –40°C to 125°C operating
temperature range.
The junction temperature (T
(T
where θ
ambient temperature is determined by specific operating conditions
in conjunction with board layout, the rated thermal package thermal
resistance and other environmental factors.
LIM
PGOOD
TRACK/SS
OSC
UVLO
RUN
INTVCC
VIN_OV
J
TOP
BOTTOM
PGOOD
A
INTVCC
FB(HYS)
≈ T
) and power dissipation (P
T
J
A
= T
. The LTC3605AE (E-grade) is guaranteed to meet specifications
JA
A
is the package thermal impedance. Note that the maximum
+ (P
PARAMETER
Positive Inductor Valley Current Limit
Top Power NMOS On-Resistance
Bottom Power NMOS On-Resistance
INTV
Threshold
Run Threshold 2 (I
Run Threshold 1 (I
Internal V
INTV
Output Overvoltage
PGOOD Upper Threshold
Output Undervoltage
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Pull-Down Resistance
PGOOD Leakage
TRACK Pull-Up Current
Oscillator Frequency
CLKIN Threshold
V
IN
D
• θ
Overvoltage Lockout Threshold
CC
CC
JA
Undervoltage Lockout
Load Regulation
°C/W)
CC
Voltage
J
) is calculated from the ambient temperature
D
) according to the formula:
Q
Q
= 2mA)
= 400µA)
CONDITIONS
V
INTV
INTV
INTV
INTV
RUN Rising
RUN Rising
4V < V
I
V
V
V
1mA Load
0.54V < V
R
CLKIN V
CLKIN V
V
V
LOAD
FB
FB
FB
FB
IN
IN
T
= 162k
Rising
Falling
= 0.57V
Rising
Falling
Returning
J
CC
CC
CC
CC
≈ T
= 0mA to 20mA
IN
= 3.3V
= 3.3V
Falling
Hysteresis (Rising)
IL
IH
< 20V
A
FB
= 25°C. (Note 2)
The
< 0.66V
l
denotes the specifications which apply over the full operating
Note 3: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 4: The LTC3605A is tested in a feedback loop that adjusts V
achieve a specified error amplifier output voltage (ITH).
Note 5: T
power dissipation as follows: T
Considerations section.
Note 6: 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.
J
is calculated from the ambient temperature T
l
J
0.45
0.85
MIN
–13
2.4
1.2
3.2
= T
23
21
5
7
1
A
+ P
D
• (37°C/W). See Thermal
0.25
1.25
23.5
21.5
TYP
–10
2.6
0.6
3.3
0.5
1.5
2.5
70
35
10
12
6
1
LTC3605A
A
MAX
0.75
150
and
7.5
2.8
1.3
3.4
1.2
0.3
60
13
–7
25
24
22
2
4
FB
to
UNITS
3605af
3
MHz
mW
mW
µA
µA
%
%
%
%
W
A
V
V
V
V
V
V
V
V
V