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Linear Technology Electronic Components Datasheet

LTC3615 Datasheet

3A Synchronous Step-Down DC/DC Converter

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LTC3615www.DataSheet4U.com
Features
Dual 4MHz, 3A Synchronous
Step-Down DC/DC Converter
Description
n High Efficiency: Up to 94%
n Dual Outputs with 2 × 3A Output Current Capability
n Low Output Ripple Burst Mode® Operation: IQ = 130µA
n 2.25V to 5.5V Input Voltage Range
n ±1% Output Voltage Accuracy
n Output Voltages Down to 0.6V
n Programmable Slew Rate at Switch Pins
n Low Dropout Operation: 100% Duty Cycle
n Shutdown Current ≤1µA
n Adjustable Switching Frequency Up to 4MHz
n Internal or External Compensation
n Selectable Pulse-Skipping/Forced Continuous/
Burst Mode Operation with Adjustable Burst Clamp
n Optional Active Voltage Positioning (AVP) with
Internal Compensation
n Selectable 0°/90°/180° Phase Shift Between Channels
n Fixed Internal and Programmable External Soft-Start
n Accurate Start-Up Tracking Capability
n DDR Memory Mode IOUT = ±1.5A
n Available in 4mm × 4mm QFN-24 and TSSOP-24 Packages
Applications
n Point-of-Load Supplies
n Distributed Power Supplies
n Portable Computer Systems
n DDR Memory Termination
n Handheld Devices
The LTC®3615 is a dual 3A synchronous step-down regula-
tor using a current mode, constant-frequency architecture.
The DC supply current is only 130µA (Burst Mode operation
at no-load) while maintaining the output voltages, drop-
ping to zero current in shutdown. The 2.25V to 5.5V input
supply range makes the LTC3615 ideally suited for single
Li-Ion applications. 100% duty cycle capability provides
low dropout operation, which extends operating time in
battery-operated systems.
The operating frequency is externally programmable up to
4MHz, allowing the use of small surface mount inductors.
0°, 90°, or 180° of phase shift between the two channels
can be selected to minimize input current ripple and
output voltage ripple in a single 6A output configuration.
Programmable slew rate limiting reduces EMI, and external
synchronization can be applied up to 4MHz.
The internal synchronous switches increase efficiency
and eliminate the need for external catch diodes, saving
external components and board space.
The LTC3615 is offered in leadless 24-pin 4mm × 4mm
QFN and thermally enhanced 24-pin TSSOP packages.
L, LT, LTC, LTM, Linear Technology, Burst Mode 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, 5994885, 6304066, 6498466, 6580258,
6611131.
Typical Application
VIN
100µF
SVIN PVIN1
RUN1
TRACK/SS1
PGOOD1
ITH1 LTC3615
SRLIM
RT/SYNC
MODE
PVIN2
SW1
FB1
PHASE
RUN2
TRACK/SS2
PGOOD2
ITH2 SGND
SW2
PGND
FB2
3615 TA01a
0.47µH
0.47µH
422k
210k
665k
210k
VOUT1
1.8V/3A
47µF
VOUT2
2.5V/3A
47µF
Efficiency and Power Loss vs Load Current
100 10
90
80 1
70
60 0.1
50
40 0.01
30
20
10 2.25MHz
0 VOUT = 2.5V
0.001
0.01
0.1
VIN = 3.3V
VIN = 4V
VIN = 5V
1
0.001
0.0001
OUTPUT CURRENT (A)
3615 TA01b
3615f



Linear Technology Electronic Components Datasheet

LTC3615 Datasheet

3A Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3615
www.DataSheet4U.com
Absolute Maximum Ratings (Note 1)
PVIN1, PVIN2 Voltages.....................–0.3V to SVIN + 0.3V
SVIN Voltage................................................. –0.3V to 6V
SW1 Voltage ..............................–0.3V to (PVIN1 + 0.3V)
SW2 Voltage...............................–0.3V to (PVIN2 + 0.3V)
PGOOD1, PGOOD2 Voltages......................... –0.3V to 6V
All Other Pins............................... –0.3V to (SVIN + 0.3V)
Operating Junction Temperature
Range (Note 2)....................................... –40°C to 125°C
Storage Temperature.............................. –65°C to 150°C
Lead Soldering Temperature (TSSOP)................... 300°C
Reflow Peak Body Temperature (QFN)................... 260°C
Pin Configuration
TOP VIEW
PHASE 1
FB2 2
ITH2 3
TRACK/SS2 4
SGND 5
PVIN2
PVIN2
SW2
6
7
8
SW2 9
RUN2 10
RUN1 11
RT/SYNC 12
25
PGND
24 MODE
23 FB1
22 ITH1
21 TRACK/SS1
20 SVIN
19 PVIN1
18 PVIN1
17 SW1
16 SW1
15 PGOOD1
14 SRLIM
13 PGOOD2
FE PACKAGE
24-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 33°C/W
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
TOP VIEW
24 23 22 21 20 19
ITH1 1
FB1 2
MODE 3
PHASE 4
FB2 5
ITH2 6
25
PGND
18 PGOOD1
17 SRLIM
16 PGOOD2
15 RT/SYNC
14 RUN1
13 RUN2
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3615EFE#PBF
LTC3615EFE#TRPBF
LTC3615FE
24-Lead Plastic TSSOP
–40°C to 125°C
LTC3615IFE#PBF
LTC3615IFE#TRPBF
LTC3615FE
24-Lead Plastic TSSOP
–40°C to 125°C
LTC3615EUF#PBF
LTC3615IUF#PBF
LTC3615EUF#TRPBF
LTC3615IUF#TRPBF
3615
3615
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
–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/
3615f



Part Number LTC3615
Description 3A Synchronous Step-Down DC/DC Converter
Maker Linear Technology
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LTC3615 Datasheet PDF






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