LTC3603
3
3603fc
For more information www.linear.com/LTC3603
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 LTC3603 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3603E is guaranteed to meet specifications 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
LTC3603I is guaranteed over the –40°C to 125°C operating junction
temperature range. Note that the maximum ambient temperature
consistant with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance, and other environmental factors.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
PV
IN
Operating Voltage Range 4.5 15 V
V
FB
Regulated Feedback Voltage ITH = 0.7V (Note 3)
l
0.594 0.6 0.606 V
DV
FB(LINEREG)
Feedback Voltage Line Regulation V
IN
= 5V to 15V, I
TH
= 0.7V 0.005 %/V
DV
FB(LOADREG)
Feedback Voltage Load Regulation ITH = 0.36V to 0.84V
l
0.02 0.1 %
DV
PGOOD
Power Good Range ±10 ±12 %
R
PGOOD
Power Good Resistance 55 80
Ω
I
FB
FB Input Bias Current 10 nA
g
m
Transconductance Amplifier g
m
1.7 mS
I
S
Supply Current
Active Mode
Sleep Mode
Shutdown
(Note 4)
500
75
0.2
700
100
1
µA
µA
µA
INTV
CC
V
CC
LDO Output Voltage 4.7 4.9 5.1 V
t
ON, MIN
Minimum Controllable ON-Time 95 115 ns
V
RUN
RUN Pin ON Threshold V
RUN
Rising
l
0.4 0.7 1.1 V
I
TRACK/SS
TRACK/SS Pull-Up Current TRACK/SS = 1V 1.25 µA
f
OSC
Oscillator Frequency R
T
= 105k 0.85 1 1.15 MHz
f
SYNC
SYNC Capture Range 0.3 3 MHz
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
85
45
m
Ω
m
Ω
I
LIM
Peak Current Limit 3.8 4.5 5.2 A
I
LSW
Switch Leakage Current 0.1 1 µA
V
UVLO
INTV
CC
Undervoltage Lockout INTV
CC
Ramping Up
l
4.1 4.2 4.3 V
V
UVLO, HYS
INTV
CC
Undervoltage Lockout Hysteresis 700 mV
electrical characteristics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V unless otherwise specified (Note 2).
Note 3: The LTC3603 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 the power
dissipation as follows: T
J
= T
A
+ (P
D
)(θ
JA
ºC/W).
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.
Note 7: This limit indicates the current density limitations of the internal
metallization and it is not tested in production.
