EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
UF PACKAGE
20-LEAD (4mm
×
4mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 37°C/W,
θ
JC
= 5°C/W
EXPOSED PAD (PIN 21) IS SGND, MUST BE SOLDERED TO PCB
orDer inForMation
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3603EMSE#PBF
LTC3603EMSE#TRPBF
3603
16-Lead Plastic eMSOP
–40°C to 125°C
LTC3603IMSE #PBF
LTC3603IMSE#TRPBF
3603
16-Lead Plastic eMSOP
–40°C to 125°C
LTC3603EUF#PBF
LTC3603EUF#TRPBF
3603
–40°C to 125°C
20-Lead (4mm
×
4mm) Plastic QFN
LTC3603IUF#PBF
LTC3603IUF#TRPBF
3603
–40°C to 125°C
20-Lead (4mm
×
4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2
3603fc
For more information
www.linear.com/LTC3603
LTC3603
electrical characteristics
SYMBOL
PV
IN
V
FB
DV
FB(LINEREG)
DV
FB(LOADREG)
DV
PGOOD
R
PGOOD
I
FB
g
m
I
S
PARAMETER
Operating Voltage Range
Regulated Feedback Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Power Good Range
Power Good Resistance
FB Input Bias Current
Transconductance Amplifier g
m
Supply Current
Active Mode
Sleep Mode
Shutdown
V
CC
LDO Output Voltage
Minimum Controllable ON-Time
RUN Pin ON Threshold
TRACK/SS Pull-Up Current
Oscillator Frequency
SYNC Capture Range
Top Switch On-Resistance
Bottom Switch On-Resistance
Peak Current Limit
Switch Leakage Current
INTV
CC
Undervoltage Lockout
INTV
CC
Undervoltage Lockout Hysteresis
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).
CONDITIONS
ITH = 0.7V (Note 3)
V
IN
= 5V to 15V, I
TH
= 0.7V
ITH = 0.36V to 0.84V
l
MIN
4.5
0.594
TYP
0.6
0.005
0.02
±10
55
10
1.7
MAX
15
0.606
0.1
±12
80
UNITS
V
V
%/V
%
%
Ω
nA
mS
µA
µA
µA
V
ns
V
µA
MHz
MHz
mΩ
mΩ
A
µA
V
mV
l
(Note 4)
INTV
CC
t
ON, MIN
V
RUN
I
TRACK/SS
f
OSC
f
SYNC
R
DS(ON)
I
LIM
I
LSW
V
UVLO
V
UVLO, HYS
4.7
V
RUN
Rising
TRACK/SS = 1V
R
T
= 105k
l
0.4
0.85
0.3
500
75
0.2
4.9
95
0.7
1.25
1
85
45
700
100
1
5.1
115
1.1
1.15
3
3.8
INTV
CC
Ramping Up
l
4.1
4.5
0.1
4.2
700
5.2
1
4.3
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.
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
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