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Linear Technology Electronic Components Datasheet

LTC3633 Datasheet

Dual Channel 3A 15V Monolithic Synchronous Step-Down Regulator

No Preview Available !

FEATURES
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
APPLICATIONS
n Distributed Power Systems
n Battery Powered Instruments
n Point of Load Power Supplies
LTC3633
Dual Channel 3A, 15V
Monolithic Synchronous
Step-Down Regulator
DESCRIPTION
The LTC®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 surface
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.
TYPICAL APPLICATION
VIN
12V
47µF
x2
VOUT2
5V AT 3A
22µF
1.5µH 0.1µF
73.2k 10k
RUN1
RUN2
VIN2
VIN1 INTVCC
ITH1
LTC3633
ITH2
RT
MODE/SYNC
PHMODE
V2P5
TRACKSS2
TRACKSS1
PGOOD2
PGOOD1
BOOST2
BOOST1
SW2
VON2
VFB2 SGND PGND
SW1
VON1
VFB1
2.2µF
0.1µF 1µH
10k 45.3k
VOUT1
3.3V AT 3A
22µF
3633 TA01a
For more information www.linear.com/LTC3633
Efficiency vs Load Current
100 Burst Mode
90 OPERATION
100
80 10
70
60 1
50
40 0.1
30
20 0.01
10
0
VIN = 12V
1 10
VOUT = 5V
VOUT = 3.3V 0.001
100
1000
10000
LOAD CURRENT (mA)
3633 TA01b
3633fd
1


Linear Technology Electronic Components Datasheet

LTC3633 Datasheet

Dual Channel 3A 15V Monolithic Synchronous Step-Down Regulator

No Preview Available !

LTC3633
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN1, VIN2.................................................... –0.3V to 16V
VIN1, VIN2 Transient....................................................18V
PGOOD1, PGOOD2, VON1, VON2................... –0.3V to 16V
BOOST1, BOOST2.....................................–0.3V to 19.6V
BOOST1-SW1, BOOST2-SW2..................... –0.3V to 3.6V
V2P5, INTVCC, TRACKSS1, TRACKSS2....... –0.3V to 3.6V
ITH1, ITH2, RT, MODE/SYNC.........–0.3V to INTVCC + 0.3V
VFB1, VFB2, PHMODE....................–0.3V to INTVCC + 0.3V
RUN1, RUN2..................................... –0.3V to VIN + 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
28 27 26 25 24 23
PGOOD1 1
PHMODE 2
RUN1 3
22 VIN1
21 VIN1
20 BOOST1
MODE/SYNC 4
RT 5
29
PGND
19 INTVCC
18 V2P5
RUN2 6
17 BOOST2
SGND 7
16 VIN2
PGOOD2 8
15 VIN2
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
TOP VIEW
ITH1 1
TRACKSS1 2
VFB1 3
PGOOD1 4
PHMODE 5
RUN1 6
MODE/SYNC 7
RT 8
RUN2 9
SGND 10
PGOOD2 11
VFB2 12
TRACKSS2 13
ITH2 14
29
PGND
28 VON1
27 SW1
26 SW1
25 VIN1
24 VIN1
23 BOOST1
22 INTVCC
21 V2P5
20 BOOST2
19 VIN2
18 VIN2
17 SW2
16 SW2
15 VON2
FE PACKAGE
28-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 25°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
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
LTC3633EFE#PBF
LTC3633IUFD#TRPBF
LTC3633EFE#TRPBF
3633
LTC3633FE
28-Lead (4mm × 5mm) Plastic QFN
28-Lead Plastic TSSOP
–40°C to 125°C
–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/
3633fd
2 For more information www.linear.com/LTC3633


Part Number LTC3633
Description Dual Channel 3A 15V Monolithic Synchronous Step-Down Regulator
Maker Linear Technology
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LTC3633 Datasheet PDF






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