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Linear Technology Electronic Components Datasheet

LTC3618 Datasheet

Synchronous Buck Converter

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LTC3618
Dual 4MHz, ±3A
Synchronous Buck Converter
for DDR Termination
Features
n DDR Power Supply, Termination and Reference
n High Efficiency: Up to 94%
n Dual Outputs with ±3A Output Current Capability
n 2.25V to 5.5V Input Voltage Range
n ±1% Output Voltage Accuracy
n VTT Output Voltage Down to 0.5V
n Shutdown Current ≤1µA
n VTTR = VDDQIN/2, VFB2 = VTTR
n Adjustable Switching Frequency Up to 4MHz
n Internal or External Compensation
n Selectable 0°/90°/180° Phase Shift Between Channels
n Internal or External Soft-Start for VDDQ, Internal
Soft-Start for VTT
n Power Good Status Outputs
n Low Profile 4mm × 4mm QFN-24 and TSSOP-24
Packages
Applications
n DDR Memory
n Supports DDR, DDR2, and DDR3 Standards
n Tracking Supplies
Description
The LTC®3618 is a dual synchronous step-down regulator
using a current mode, constant-frequency architecture. It
provides a complete DDR solution with an input voltage
range from 2.25V to 5.5V.
The output of the first step-down regulator offers a high
accuracy VDDQ supply. A buffered reference generates
VTTR at 50% of VDDQIN and drives loads up to ±10mA.
The second regulator generates the DDR termination volt-
age (VTT) equal to VTTR. Both regulators are capable of
delivering ±3A of load current at 1MHz switching frequency.
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. For
switching noise-sensitive applications, the LTC3618 can
be synchronized to an external clock up to 4MHz.
The LTC3618 is offered in leadless 24-pin 4mm × 4mm
QFN and thermally enhanced 24-pin TSSOP packages.
L, LT, LTC, LTM, 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, 6498466, 6580258, 6611131.
Typical Application
VIN
3.3V
100µF
SVIN PVIN1 PVIN2
RUN1
VDDQIN
1µH
TRACK/SS1
SW1
PGOOD1
ITH1
LTC3618 FB1
RT
392k
MODE/SYNC
1µH
PHASE
SW2
RUN2
PGOOD2
FB2
VREF
=
VDDQ
2
0.01µF
ITH2
VTTR
SGND
PGND
3618 TA01a
422k
210k
VDDQ
1.8V/3A
47µF
VTT
0.9V/±3A
47µF
Efficiency and Power Loss vs Load Current
100
90
80
70
60
50
40
30
20
10
0
0.01
VDDQ = 1.8V
VTT = 0.9V
0.1
1
LOAD CURRENT (A)
10
1
0.1
0.01
10
3618 TA01b
For more information www.linear.com/LTC3618
3618fc
1


Linear Technology Electronic Components Datasheet

LTC3618 Datasheet

Synchronous Buck Converter

No Preview Available !

LTC3618
Absolute Maximum Ratings (Notes 1, 10)
PVIN1, PVIN2 Voltages................................... –0.3V to 6V
SVIN Voltage................................................. –0.3V to 6V
SW1 Voltage ..............................–0.3V to (PVIN1 + 0.3V)
SW2 Voltage...............................–0.3V to (PVIN2 + 0.3V)
RUN1 Voltage............................... –0.3V to (SVIN + 0.6V)
All Other Pins................................................ –0.3V to 6V
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
PHASE 1
FB2 2
ITH2 3
VDDQIN 4
SGND 5
PVIN2 6
PVIN2 7
SW2 8
SW2 9
RUN2 10
RUN1 11
RT 12
TOP VIEW
25
PGND
24 MODE/SYNC
23 ITH1
22 FB1
21 TRACK/SS1
20 SVIN
19 PVIN1
18 PVIN1
17 SW1
16 SW1
15 PGOOD1
14 VTTR
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
FB1 1
ITH1 2
MODE/SYNC 3
PHASE 4
FB2 5
ITH2 6
25
PGND
18 PGOOD1
17 VTTR
16 PGOOD2
15 RT
14 RUN1
13 RUN2
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 46.9°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
LTC3618EFE#PBF
LTC3618EFE#TRPBF
LTC3618FE
24-Lead Plastic TSSOP
–40°C to 125°C
LTC3618IFE#PBF
LTC3618IFE#TRPBF
LTC3618FE
24-Lead Plastic TSSOP
–40°C to 125°C
LTC3618EUF#PBF
LTC3618EUF#TRPBF
3618
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3618IUF#PBF
LTC3618IUF#TRPBF
3618
24-Lead (4mm × 4mm) Plastic QFN
–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/
3618fc
2
For more information www.linear.com/LTC3618


Part Number LTC3618
Description Synchronous Buck Converter
Maker Linear
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LTC3618 Datasheet PDF






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