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LTC3633IFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LTC3633
1
3633fd
For more information www.linear.com/LTC3633
TYPICAL APPLICATION
FEATURES DESCRIPTION
Dual Channel 3A, 15V
Monolithic Synchronous
Step-Down Regulator
The LT C
®
3633 is a high efficiency, dual-channel monolithic
synchronous buck regulator using a controlled on-time,
current mode architecture, with phase lockable switching
frequency. The two channels can run 180° out of phase,
which relaxes the requirements for input and output ca
-
pacitance. The operating supply voltage range is from 3.6V
to 15V
, making it suitable for dual cell lithium-ion batteries
as well as point of load power supply applications from
a 12V or 5V supply
.
The operating frequency is programmable and synchroniz
-
able from 500kHz to 4MHz with an external resistor. The
high frequency capability allows the use of small sur
face
mount inductors and capacitors. The
unique constant
frequency/controlled on-time architecture is ideal for high
step-down ratio applications that operate at high frequency
while demanding fast transient response. An internal phase
lock loop servos the on-time of the internal one-shot timer
to match the frequency of the internal clock or an applied
external clock.
The LTC3633 can select between forced continuous mode
and high efficiency Burst Mode operation.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents including 5481178, 5847554, 6580258, 6304066, 6476589,
6774611.
APPLICATIONS
n
3.6V to 15V Input Voltage Range
n
3A Output Current per Channel
n
Up to 95% Efficiency
n
Low Duty Cycle Operation: 5% at 2.25MHz
n
Selectable 0°/180° Phase Shift Between Channels
n
Adjustable Switching Frequency: 500kHz to 4MHz
n
External Frequency Synchronization
n
Current Mode Operation for Excellent Line and
Load Transient Response
n
0.6V Reference Allows Low Output Voltages
n
User Selectable Burst Mode
®
Operation or Forced
Continuous Operation
n
Output Voltage Tracking and Soft-Start Capability
n
Short-Circuit Protected
n
Overvoltage Input and Overtemperature Protection
n
Low Power 2.5V Linear Regulator Output
n
Power Good Status Outputs
n
Available in (4mm × 5mm) QFN-28 and 28-Lead
TSSOP Packages
n
Distributed Power Systems
n
Battery Powered Instruments
n
Point of Load Power Supplies
Efficiency vs Load Current
1
0
EFFICIENCY (%)
POWER LOSS (W)
10
30
40
50
70
100
10000
3633 TA01b
20
80
100
90
60
0.001
0.1
0.01
10
100
1
10 1000
V
OUT
= 5V
V
OUT
= 3.3V
LOAD CURRENT (mA)
Burst Mode
OPERATION
V
IN
= 12V
RUN1
RUN2
TRACKSS2
PGOOD2
LTC3633
BOOST2
0.1µF
1.5µH
73.2k
10k
SW2
V
ON2
V
IN2
PGNDSGND
V
IN1
V
FB2
PHMODE
TRACKSS1
PGOOD1
BOOST1
SW1
V
ON1
V
FB1
22µF
V
OUT2
5V AT 3A
0.1µF
1µH
45.3k
10k
22µF
V
OUT1
3.3V AT 3A
V
IN
12V
47µF
x2
MODE/SYNC
V2P5
RT
ITH1
ITH2
INTV
CC
2.2µF
3633 TA01a
LTC3633
2
3633fd
For more information www.linear.com/LTC3633
ABSOLUTE MAXIMUM RATINGS
V
IN1
, V
IN2
................................................... –0.3V to 16V
V
IN1
, V
IN2
Transient ................................................... 18V
PGOOD1, PGOOD2, V
ON1
, V
ON2
.................. –0.3V to 16V
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
(Note 1)
9 10
TOP VIEW
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
11 12 13
28 27 26 25 24
14
23
6
5
4
3
2
1
PGOOD1
PHMODE
RUN1
MODE/SYNC
RT
RUN2
SGND
PGOOD2
V
IN1
V
IN1
BOOST1
INTV
CC
V2P5
BOOST2
V
IN2
V
IN2
V
FB1
TRACKSS1
ITH1
V
ON1
SW1
SW1
V
FB2
TRACKSS2
ITH2
V
ON2
SW2
SW2
7
17
18
19
20
21
22
16
8
15
29
PGND
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
FE PACKAGE
28-LEAD PLASTIC TSSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ITH1
TRACKSS1
V
FB1
PGOOD1
PHMODE
RUN1
MODE/SYNC
RT
RUN2
SGND
PGOOD2
V
FB2
TRACKSS2
ITH2
V
ON1
SW1
SW1
V
IN1
V
IN1
BOOST1
INTV
CC
V2P5
BOOST2
V
IN2
V
IN2
SW2
SW2
V
ON2
29
PGND
T
JMAX
= 125°C, θ
JA
= 25°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3633EUFD#PBF LTC3633EUFD#TRPBF 3633
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3633IUFD#PBF LTC3633IUFD#TRPBF 3633
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3633EFE#PBF LTC3633EFE#TRPBF LTC3633FE 28-Lead Plastic TSSOP –40°C to 125°C
LTC3633IFE#PBF LTC3633IFE#TRPBF LTC3633FE 28-Lead Plastic TSSOP –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/
LTC3633
3
3633fd
For more information www.linear.com/LTC3633
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.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Supply Range
l
3.6 15 V
I
Q
Input DC Supply Current (V
IN1
+ V
IN2
)
Both Channels Active (Note 4)
Sleep Current
Shutdown
MODE = 0V
MODE = INTV
CC
, V
FB1
, V
FB2
> 0.6
RUN1 = RUN2 = 0V
1.3
500
13
mA
µA
µA
V
FB
Feedback Reference Voltage
l
0.594 0.6 0.606 V
∆V
LINE_REG
Reference Voltage Line Regulation V
IN
= 3.6V to 15V 0.02 %/V
∆V
LOAD_REG
Output Voltage Load Regulation ITH = 0.8V to 1.6V 0.05 %
I
FB
Feedback Pin Input Current ±30 nA
g
m(EA)
Error Amplifier Transconductance ITH = 1.2V 1.8 mS
t
ON
Minimum On Time V
ON
= 1V, V
IN
= 4V 20 ns
t
OFF
Minimum Off Time V
IN
= 6V 40 60 ns
f
OSC
Oscillator Frequency V
RT
= INTV
CC
RT = 160k
RT = 80k
1.4
1.7
3.4
2
2
4
2.6
2.3
4.6
MHz
MHz
MHz
I
LIM
Positive Valley Switch Current Limit 2.6 3.5 4.5 A
Negative Valley Switch Current Limit –2 A
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
130
65
mΩ
mΩ
I
SW(LKG)
Switch Leakage Current V
IN
= 15V, V
RUN
= 0V 0.01 ±1 µA
V
VIN-OV
V
IN
Overvoltage Lockout Threshold V
IN
Rising
V
IN
Falling
16.8
15.8
17.5
16.5
18
17
V
V
INTV
CC
Voltage 3.6V < V
IN
< 15V, 0mA Load 3.1 3.3 3.5 V
INTV
CC
Load Regulation 0mA to 50mA Load, V
IN
= 4V to 15V 0.7 %
RUN Threshold Rising
RUN Threshold Falling
l
l
1.18
0.98
1.22
1.01
1.26
1.04
V
V
RUN Leakage Current V
IN
= 15V 0 ±3 µA
V2P5 Voltage I
LOAD
= 0mA to 10mA
l
2.46 2.5 2.54 V
PGOOD Good-to-Bad Threshold V
FB
Rising
V
FB
Falling
8
–8
10
–10
%
%
PGOOD Bad-to-Good Threshold V
FB
Rising
V
FB
Falling
–3
3
–5
5
%
%
R
PGOOD
PGOOD Pull-Down Resistance 10mA Load 15 Ω
t
PGOOD
Power Good Filter Time 20 40 µs
t
SS
Internal Soft-Start Time 10% to 90% Rise Time 400 700 µs
V
FB
During Tracking TRACKSS = 0.3V 0.28 0.3 0.315 V
I
TRACKSS
TRACKSS Pull-Up Current 1.4 µA
V
PHMODE
PHMODE Threshold Voltage PHMODE V
IH
PHMODE V
IL
1
0.3
V
V
V
MODE/SYNC
MODE/SYNC Threshold Voltage MODE V
IH
MODE V
IL
1
0.4
V
V
SYNC Threshold Voltage SYNC V
IH
0.95 V
I
MODE
MODE/SYNC Input Current MODE = 0V
MODE = INTV
CC
1.5
–1.5
µA
µA
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LTC3633IFE#PBF

Mfr. #:
Buy LTC3633IFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual 3A, 15Vin, 4MHz, Monolithic Synchronous Step-Down Regulator
Lifecycle:
New from this manufacturer.
Delivery:
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