EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
FE PACKAGE
28-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 25°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
Downloaded from
Arrow.com.
2
3634fc
For more information
www.linear.com/LTC3034
LTC3634
ORDER INFORMATION
LEAD FREE FINISH
LTC3634EUFD#PBF
LTC3634IUFD#PBF
LTC3634HUFD#PBF
LTC3634MPUFD#PBF
LTC3634EFE#PBF
LTC3634IFE#PBF
LTC3634HFE#PBF
LTC3634MPFE#PBF
TAPE AND REEL
LTC3634EUFD#TRPBF
LTC3634IUFD#TRPBF
LTC3634HUFD#TRPBF
LTC3634MPUFD#TRPBF
LTC3634EFE#TRPBF
LTC3634IFE#TRPBF
LTC3634HFE#TRPBF
LTC3634MPFE#TRPBF
PART MARKING*
3634
3634
3634
3634
LTC3634FE
LTC3634FE
LTC3634FE
LTC3634FE
PACKAGE DESCRIPTION
28-Lead (5mm × 4mm) Plastic QFN
28-Lead (5mm × 4mm) Plastic QFN
28-Lead (5mm × 4mm) Plastic QFN
28-Lead (5mm × 4mm) Plastic QFN
28-Lead Plastic TSSOP
28-Lead Plastic TSSOP
28-Lead Plastic TSSOP
28-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
PARAMETER
V
IN1
, Operating Supply Range
V
IN2
, Operating Supply Range
Output Voltage Range
I
Q
V
FBREG1
V
FBREG2
VTTR
I
FB
g
m(EA)
t
ON(MIN)
t
OFF(MIN)
f
OSC
I
LIM1
I
LIM2
R
DS(ON)
Input DC Supply Current (V
IN1
+ V
IN2
)
Active (Note 7)
Shutdown
Feedback Reference Voltage
The
l
denotes the specifications which apply over the specified junction
temperature range, otherwise specifications are at T
A
= 25°C (Note 4). V
IN
= 12V, INTV
CC
= 3.3V, unless otherwise noted.
CONDITIONS
V
IN1
> 3.6V
V
ON
= V
OUT
(Note 6)
RUN1 = RUN2 = V
IN
RUN1 = RUN2 = 0V
3.6V < V
IN
< 15V, 0.5V < ITH < 1.8V
0°C < T
A
< 85°C
–55°C < T
A
< 150°C
3.6V < V
IN
< 15V, 0.5V < ITH < 1.8V
1.5V < VDDQIN < 2.6V
I
LOAD
= ±10mA, C
LOAD
< 10nF
ITH = 1.2V
V
ON
= 0.5V, V
IN
= 4V
V
IN
= 6V
V
RT
= INTV
CC
R
T
= 162k
R
T
= 80.6k
1.4
1.7
3.4
3.3
l
l
l
l
l
l
MIN
3.6
1.4
0.6
TYP
MAX
15
15
3
UNITS
V
V
V
mA
µA
1.3
15
0.594
0.592
VTTR – 6
0.492 •
VDDQIN
0.6
0.6
VTTR
0.50 •
VDDQIN
1.0
20
40
2
2
4
4.4
8
4.4
8
130
65
130
65
60
2.6
2.3
4.6
5.5
0.606
0.606
VTTR + 6
0.508 •
VDDQIN
±30
V
V
mV
V
nA
mS
ns
ns
MHz
MHz
MHz
A
A
A
A
mΩ
mΩ
mΩ
mΩ
3634fc
Feedback Reference Voltage
VTTR Voltage Reference
Feedback Pin Input Current
Error Amplifier Transconductance
Minimum On-Time
Minimum Off-Time
Oscillator Frequency
Channel 1 Valley Switch Current Limit
Positive Limit
Negative Limit
Channel 2 Valley Switch Current Limit
Positive Limit
Negative Limit
Channel 1
Top Switch On-Resistance
Bottom Switch On-Resistance
Channel 2
Top Switch On-Resistance
Bottom Switch On-Resistance
3.3
5.5
For more information
www.linear.com/LTC3034
Downloaded from
Arrow.com.
3
LTC3634
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
Switch Leakage Current
V
IN
Overvoltage Lockout Threshold
INTV
CC
Voltage
INTV
CC
Load Regulation
RUN Threshold Rising
RUN Threshold Falling
RUN Leakage Current
PGOOD Good-to-Bad Threshold
PGOOD Hysteresis
R
PGOOD
t
SS1
t
SS2
I
TRACKSS
PGOOD Pull-Down Resistance
Power Good Filter Time
Channel 1 Internal Soft-Start Ramp Rate
Channel 2 Internal Soft-Start Ramp Rate
V
FB1
During Tracking
TRACKSS Pull-Up Current
Phase Shift Between Channel 1 and
Channel 2
PHMODE Threshold Voltage
MODE/SYNC Threshold Voltage
SYNC Threshold Voltage
MODE/SYNC Input Current
PHMODE = 0V
PHMODE = INTV
CC
V
IH
V
IL
V
IH
V
IL
V
IH
MODE = 0V
MODE = INTV
CC
1
1
0.95
1.5
–1.5
TRACKSS = 0.3V
V
FB
Rising
V
FB
Falling
V
FB
from Bad-to-Good
10mA Load
20
0.7
1.5
0.28
The
l
denotes the specifications which apply over the specified operating
temperature range, otherwise specifications are at T
A
= 25°C (Note 4). V
IN
= 12V, INTV
CC
= 3.3V, unless otherwise noted.
CONDITIONS
V
IN
= 15V, V
RUN
= 0V
V
IN
Rising
V
IN
Falling
3.6V < V
IN
< 15V, 0mA Load
0mA to 50mA Load, V
IN
= 4V to 15V
l
l
MIN
16.8
15.8
3.1
1.18
0.98
TYP
0.01
17.5
16.5
3.3
0.7
1.22
1.01
0
8
–8
15
15
40
1.2
2.2
0.3
1.4
90
180
MAX
±1
18
17
3.5
1.26
1.04
±1
10
–10
UNITS
µA
V
V
V
%
V
V
µA
%
%
mV
Ω
µs
V/ms
V/ms
0.315
V
µA
deg
deg
0.3
0.4
V
V
V
V
V
µA
µA
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:
Transient event duration must be < 1% of total lifetime of the part.
Note 3:
Guaranteed by long term current density limitations.
Note 4:
The LTC3634 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3634E is guaranteed to meet specified performance
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
LTC3634I is guaranteed to meet specifications over the –40°C to 125°C
operating junction temperature range. The LTC3634H is guaranteed
over the –40°C to 150°C operating junction temperature range and the
LTC3634MP is tested and guaranteed over the –55°C to 150°C operating
junction temperature range. High junction temperatures degrade operating
lifetimes; operating lifetime is derated for junction temperatures greater
than 125°C. Note that the maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
Note 5:
The junction temperature (T
J
, in °C) is calculated from the ambient
temperature (T
A
, in °C), package thermal impedance (θ
JA
, in °C/W), and
power dissipation (P
D
, in Watts) according to the formula: T
J
= T
A
+ P
D
•
θ
JA
.
Note 6:
Output voltage settings above 3V are not optimized for controlled
on-time operation. For designs that set output voltages above 3V, please
refer to the Applications Information section for information on device
operation outside the optimized range.
Note 7:
Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 8:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
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