LTC3605_15 Datasheet, PDF (3/22 Pages) Linear Technology – 15V, 5A Synchronous Step-Down Regulator

LTC3605
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
PV_IN
V_IN Supply Range
I_Q
Input DC Supply Current
Active
Shutdown
V_FB
Feedback Reference Voltage
(Note 3)
Mode = 0, R_T = 162k
V_IN =12V, RUN = 0
ITH =1.2V (Note 4) –40°C to 85°C
ITH =1.2V (Note 4) –40°C to 125°C
4
15
V
2
5
mA
11
40
µA
l 0.594
0.600
0.606
V
l _0.592
0.600
0.608
V
DV_FB(LINE)
DV_FB(LOAD)
Feedback Voltage Line
Regulation
Feedback Voltage Load
Regulation
V_IN = 4V to 15V, ITH = 1.2V, –40°C to 85°C l
V_IN = 4V to 15V, ITH = 1.2V, –40°C to 125°C ^l
ITH = 0.8V to 1.6V, –40°C to 85°C
l
ITH = 0.8V to 1.6V, –40°C to 125°C
l
0.001
0.02
%/V
0.04
0.1
%/V
0.1
0.2
%
0.1
0.3
%
I_FB
g_m (EA)
t_ON(MIN)
t_OFF(MIN)
I_LIM
Feedback Pin Input Current
Error Amplifier Transconductance
Minimum On-Time
Minimum Off-Time
Positive Inductor Valley Current Limit
Negative Inductor Valley Current Limit
ITH = 1.2V
V_FB = 0.57V
±30
nA
1.15
1.35
1.6
mS
40
ns
70
ns
5
6
7.5
A
–5
A
R_TOP
R_BOTTOM
V_UVLO
V_RUN
V_INTVCC
DV_INTVCC
OV
Top Power NMOS On-Resistance
Bottom Power NMOS On-Resistance
INTV_CC Undervoltage Lockout
Threshold
Run Threshold 2 (I_Q = 2mA)
Run Threshold 1 (I_Q = 400µA)
Internal V_CC Voltage
INTV_CC Load Regulation
Output Overvoltage
PGOOD Upper Threshold
INTV_CC = 3.3V
INTV_CC = 3.3V
INTV_CC Falling
INTV_CC Hysteresis (Rising)
RUN Rising
RUN Rising
4V < V_IN < 15V
I_LOAD = 0mA to 20mA
V_FB Rising
70
150
mW
35
55
mW
2.4
2.6
2.8
V
0.25
V
1.2
1.25
1.3
V
0.45
0.6
0.75
V
3.2
3.3
3.4
V
0.5
%
7
10
13
%
UV
Output Undervoltage
PGOOD Lower Threshold
V_FB Falling
–13
–10
–7
%
DV_FB(HYS)
R_PGOOD
I_PGOOD
I_TRACK/SS
f_OSC
CLKIN
PGOOD Hysteresis
PGOOD Pull-Down Resistance
PGOOD Leakage
TRACK Pull-Up Current
Oscillator Frequency
CLKIN Threshold
V_FB Returning
1mA Load
0.54V < V_FB < 0.66V
R_T = 162k
1.5
%
12
25
W
2
µA
2.5
4
µA
l 0.85
1
1.2
MHz
0.7
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. Absolute Maximum Ratings are those values beyond
which the life of a device may be impaired.
Note 2: The LTC3605E 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. The LTC3605I is guaranteed over the full
–40°C to 125°C operating temperature range.
Note 3: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 4: The LTC3605 is tested in a feedback loop that adjusts V_FB to
achieve a specified error amplifier output voltage (ITH).
Note 5: T_J is calculated from the ambient temperature T_A and
power dissipation as follows: T_J = T_A + P_D • (37°C/W). See Thermal
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.
3605fd
For more information www.linear.com/LTC3605
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