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Linear Technology Electronic Components Datasheet

LTC3615-1 Datasheet

3A Synchronous Step-Down DC/DC Converter

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LTC3615/LTC3615-1
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° (LTC3615) or selectable
140°/180° (LTC3615-1) 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/LTC3615-1 are dual 3A synchronous step-
down regulators 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, dropping to zero current in shutdown. The 2.25V
to 5.5V input supply range makes the parts 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° (LTC3615) or 140°/180° (LTC3615-1) of
phase shift between the two channels can be selected to
minimize input current ripple and output voltage ripple in a
dual 3A or single 6A output configuration. Programmable
slew rate limiting reduces EMI, and external synchroniza-
tion 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/LTC3615-1 are 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
For more information www.linear.com/LTC3615
3615fb
1
Free Datasheet http://www.datasheet4u.com/


Linear Technology Electronic Components Datasheet

LTC3615-1 Datasheet

3A Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3615/LTC3615-1
Absolute Maximum Ratings (Notes 1, 11)
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 (Notes 2, 11)................................ –55°C to 150°C
Storage Temperature.............................. –65°C to 150°C
Lead Soldering Temperature (eTSSOP).................. 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 eTSSOP
TJMAX = 150°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 × 4mm) PLASTIC QFN
TJMAX = 150°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
LTC3615HFE#PBF
LTC3615HFE#TRPBF
LTC3615FE
24-Lead Plastic TSSOP
–40°C to 150°C
LTC3615MPFE#PBF
LTC3615MPFE#TRPBF
LTC3615FE
24-Lead Plastic TSSOP
–55°C to 150°C
LTC3615EUF#PBF
LTC3615IUF#PBF
LTC3615HUF#PBF
LTC3615MPUF#PBF
LTC3615EFE-1#PBF
LTC3615EUF#TRPBF
LTC3615IUF#TRPBF
LTC3615HUF#TRPBF
LTC3615MPUF#TRPBF
LTC3615EFE-1#TRPBF
3615
3615
3615
3615
LTC3615FE-1
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
24-Lead Plastic TSSOP
–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
LTC3615IFE-1#PBF
LTC3615IFE-1#TRPBF
LTC3615FE-1
24-Lead Plastic TSSOP
–40°C to 125°C
LTC3615HFE-1#PBF
LTC3615HFE-1#TRPBF
LTC3615FE-1
24-Lead Plastic TSSOP
–40°C to 150°C
LTC3615MPFE-1#PBF
LTC3615MPFE-1#TRPBF
LTC3615FE-1
24-Lead Plastic TSSOP
–55°C to 150°C
LTC3615EUF-1#PBF
LTC3615IUF-1#PBF
LTC3615HUF-1#PBF
LTC3615MPUF-1#PBF
LTC3615EUF-1#TRPBF
LTC3615IUF-1#TRPBF
LTC3615HUF-1#TRPBF
LTC3615MPUF-1#TRPBF
36151
36151
36151
36151
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
24-Lead (4mm × 4mm) Plastic QFN
–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.
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/
3615fb
2 For more information www.linear.com/LTC3615
Free Datasheet http://www.datasheet4u.com/


Part Number LTC3615-1
Description 3A Synchronous Step-Down DC/DC Converter
Maker Linear
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