BOOST1, BOOST2 ....................................–0.3V to 19.6V
BOOST1-SW1, BOOST2-SW2.................... –0.3V to 3.6V
V2P5, INTV
CC
, TRACKSS1, TRACKSS2 ...... –0.3V to 3.6V
ITH1, ITH2, RT, MODE/SYNC........–0.3V to INTV
CC
+ 0.3V
V
FB1
, V
FB2
, PHMODE. ..................–0.3V to INTV
CC
+ 0.3V
RUN1, RUN2 .................................... –0.3V to V
IN
+ 0.3V
Operating Junction Temperature Range
(Notes 2, 3) ............................................ –40°C to 125°C
Storage Temperature Range .................. –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
TRACKSS1
ITH1
V
ON1
ITH1
SW1
SW1
TRACKSS1
V
FB1
22 V
IN1
21 V
IN1
20 BOOST1
29
PGND
19 INTV
CC
18 V2P5
17 BOOST2
16 V
IN2
15 V
IN2
9 10 11 12 13 14
ITH2
SW2
TRACKSS2
V
ON2
SW2
V
FB2
PGOOD1
PHMODE
RUN1
MODE/SYNC
RT
RUN2
1
2
3
4
5
6
7
8
9
29
PGND
TOP VIEW
28 V
ON1
27 SW1
26 SW1
25 V
IN1
24 V
IN1
23 BOOST1
22 INTV
CC
21 V2P5
20 BOOST2
19 V
IN2
18 V
IN2
17 SW2
16 SW2
15 V
ON2
V
FB1
PGOOD1 1
PHMODE 2
RUN1 3
MODE/SYNC 4
RT 5
RUN2 6
SGND 7
PGOOD2 8
28 27 26 25 24 23
SGND 10
PGOOD2 11
V
FB2
12
TRACKSS2 13
ITH2 14
UFD PACKAGE
28-LEAD (4mm
×
5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
FE PACKAGE
28-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 25°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3633EUFD#PBF
LTC3633IUFD#PBF
LTC3633EFE#PBF
LTC3633IFE#PBF
TAPE AND REEL
LTC3633EUFD#TRPBF
LTC3633IUFD#TRPBF
LTC3633EFE#TRPBF
LTC3633IFE#TRPBF
PART MARKING*
3633
3633
LTC3633FE
LTC3633FE
PACKAGE DESCRIPTION
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead Plastic TSSOP
28-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
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/
3633fd
2
For more information
www.linear.com/LTC3633
LTC3633
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
I
Q
PARAMETER
Supply Range
Input DC Supply Current (V
IN1
+ V
IN2
)
Both Channels Active (Note 4)
Sleep Current
Shutdown
Feedback Reference Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
Feedback Pin Input Current
Error Amplifier Transconductance
Minimum On Time
Minimum Off Time
Oscillator Frequency
ITH = 1.2V
V
ON
= 1V, V
IN
= 4V
V
IN
= 6V
V
RT
= INTV
CC
RT = 160k
RT = 80k
1.4
1.7
3.4
2.6
1.8
20
40
2
2
4
3.5
–2
130
65
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
The
l
denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at T
J
= 25°C (Note 2). V
IN1
= V
IN2
= 12V, unless otherwise noted.
CONDITIONS
l
MIN
3.6
TYP
MAX
15
UNITS
V
mA
µA
µA
MODE = 0V
MODE = INTV
CC
, V
FB1
, V
FB2
> 0.6
RUN1 = RUN2 = 0V
l
1.3
500
13
0.594
0.6
0.02
0.05
±30
0.606
V
FB
∆V
LINE_REG
∆V
LOAD_REG
I
FB
g
m(EA)
t
ON
t
OFF
f
OSC
I
LIM
R
DS(ON)
I
SW(LKG)
V
VIN-OV
V
%/V
%
nA
mS
ns
V
IN
= 3.6V to 15V
ITH = 0.8V to 1.6V
60
2.6
2.3
4.6
4.5
ns
MHz
MHz
MHz
A
A
mΩ
mΩ
Positive Valley Switch Current Limit
Negative Valley Switch Current Limit
Top Switch On-Resistance
Bottom Switch On-Resistance
Switch Leakage Current
V
IN
Overvoltage Lockout Threshold
INTV
CC
Voltage
INTV
CC
Load Regulation
RUN Threshold Rising
RUN Threshold Falling
RUN Leakage Current
V2P5 Voltage
PGOOD Good-to-Bad Threshold
PGOOD Bad-to-Good Threshold
V
IN
= 15V
I
LOAD
= 0mA to 10mA
V
FB
Rising
V
FB
Falling
V
FB
Rising
V
FB
Falling
10mA Load
l
0.01
16.8
15.8
3.1
1.18
0.98
2.46
17.5
16.5
3.3
0.7
1.22
1.01
0
2.5
8
–8
–3
3
20
–5
5
15
40
400
0.28
1
1
0.95
1.5
–1.5
0.3
1.4
±1
18
17
3.5
1.26
1.04
±3
2.54
10
–10
µA
V
V
V
%
V
V
µA
V
%
%
%
%
Ω
µs
R
PGOOD
t
PGOOD
t
SS
I
TRACKSS
V
PHMODE
V
MODE/SYNC
PGOOD Pull-Down Resistance
Power Good Filter Time
Internal Soft-Start Time
V
FB
During Tracking
TRACKSS Pull-Up Current
PHMODE Threshold Voltage
MODE/SYNC Threshold Voltage
SYNC Threshold Voltage
10% to 90% Rise Time
TRACKSS = 0.3V
PHMODE V
IH
PHMODE V
IL
MODE V
IH
MODE V
IL
SYNC V
IH
MODE = 0V
MODE = INTV
CC
700
0.315
µs
V
µA
V
V
V
V
V
µA
µA
0.3
0.4
I
MODE
MODE/SYNC Input Current
3633fd
For more information
www.linear.com/LTC3633
3
LTC3633
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:
The LTC3633 is tested under pulsed load conditions such that
T
J
≈
T
A
. The LTC3633E is guaranteed to meet performance 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 LTC3633I is guaranteed over the full –40°C to 125°C operating
junction temperature range. 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. The junction temperature
(T
J
, in °C) is calculated from the ambient temperature (T
A
, in °C) and
power dissipation (P
D
, in watts) according to the formula:
T
J
= T
A
+ (P
D
•
θ
JA
), where
θ
JA
(in °C/W) is the package thermal
impedance.
Note 3:
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 4:
Dynamic supply current is higher due to the internal gate charge
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