LTC3606B
3
3606bfb
ELECTRICAL CHARACTERISTICS
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: Guaranteed by long term current density limitations.
Note 3: The LTC3606BE is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3606BI is guaranteed
to meet specifi ed performance over the full –40°C to 125°C operating
junction temperature range.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
The l denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations are at T
A
= 25°C, V
IN
= 5V, unless otherwise noted.
Note 5: The switch on-resistance is guaranteed by correlation to wafer
level measurements.
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 specifi ed maximum operating junction
temperature may impair device reliability.
Note 7: The converter is tested in a proprietary test mode that connects
the output of the error amplifi er to the SW pin, which is connected to an
external servo loop.
Note 8: T
J
is calculated from the ambient temperature T
A
and the power
dissipation as follows: T
J
= T
A
+ (P
D
)(θ
JA
°C/W)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
V
IN
Operating Voltage Range
l
2.5 5.5 V
V
UV
V
IN
Undervoltage Lockout V
IN
Low to High
l
2.1 2.5 V
I
FB
Feedback Pin Input Current
l
±30 nA
V
FBREG
Feedback Voltage LTC3606BE, –40°C < T
J
< 85°C (Note 7)
LTC3606BI, –40°C < T
J
< 125°C (Note 7)
l
l
0.588
0.582
0.600
0.600
0.612
0.618
V
V
V
LINEREG
V
FB
Line Regulation V
IN
= 2.5V to 5.5V (Note 7) 0.01 0.25 %/V
V
LOADREG
V
FB
Load Regulation I
LOAD
= 0mA to 800mA (Note 7) 0.5 %
I
S
Supply Current
Active Mode (Note 4)
Shutdown
V
FB
= 0.95 × V
FBREG
V
RUN
= 0V, V
IN
= 5.5V
420 650
1
µA
µA
f
OSC
Oscillator Frequency V
FB
= V
FBREG
l
1.8 2.25 2.7 MHz
I
LIM(PEAK)
Peak Switch Current Limit V
IN
= 5V, V
FB
< V
FBREG
, Duty Cycle <35% 1800 2400 mA
I
INLIM
Input Average Current Limit RLIM = 116k
RLIM = 116k, LTC3606BE
RLIM = 116k, LTC3606BI
l
l
450
437
427
475
475
475
500
513
523
mA
mA
mA
R
DS(ON)
Main Switch On-Resistance (Note 5)
Synchronous Switch On-Resistance (Note 5)
V
IN
= 5V, I
SW
= 100mA
V
IN
= 5V, I
SW
= 100mA
0.27
0.25
I
SW(LKG)
Switch Leakage Current V
IN
= 5V, V
RUN
= 0V 0.01 1 µA
t
SOFTSTART
Soft-Start Time V
FB
from 0.06V to 0.54V 0.3 0.95 1.3 ms
V
RUN
RUN Threshold High
l
0.4 1 1.2 V
I
RUN
RUN Leakage Current 0V ≤ V
RUN
≤ 5V
l
0.01 1 µA
PGOOD Power Good Threshold Entering Window
V
FB
Ramping Up
V
FB
Ramping Down
Leaving Window
V
FB
Ramping Up
V
FB
Ramping Down
–5
5
–7
7
9
–9
11
–11
%
%
%
%
PGOOD Blanking Power Good Blanking Time PGOOD Rising and Falling, V
IN
= 5V 90 µs
R
PGOOD
Power Good Pull-Down On-Resistance 8 15 30
I
PGOOD
PGOOD Leakage Current V
PGOOD
= 5V ±1 µA
