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Linear Technology Electronic Components Datasheet

LTC3614 Datasheet

4MHz Monolithic Synchronous Step-Down DC/DC Converter

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Features
n 4A Output Current
n 2.25V to 5.5V Input Voltage Range
n Low Output Ripple Burst Mode® Operation: IQ = 75µA
n ±1% Output Voltage Accuracy
n Output Voltage Down to 0.6V
n High Efficiency: Up to 95%
n Low Dropout Operation: 100% Duty Cycle
n Programmable Slew Rate on SW Node Reduces
Noise and EMI
n Adjustable Switching Frequency: Up to 4MHz
n Optional Active Voltage Positioning (AVP) with
Internal Compensation
n Selectable Pulse-Skipping/Forced Continuous/Burst
Mode Operation with Adjustable Burst Clamp
n Programmable Soft-Start
n Inputs for Start-Up Tracking or External Reference
n DDR Memory Mode, IOUT = ±3A
n Available in a 24-Pin 3mm × 5mm QFN
Thermally Enhanced Package
Applications
n Point-of-Load Supplies
n Distributed Power Supplies
n Portable Computer Systems
n DDR Memory Termination
n Handheld Devices
LTC3614
4A, 4MHz Monolithic
Synchronous Step-Down
DC/DC Converter
Description
The LTC®3614 is a low quiescent current monolithic syn-
chronous buck regulator using a current mode, constant
frequency architecture. The no-load DC supply current
in sleep mode is only 75µA while maintaining the output
voltage (Burst Mode operation) at no load, dropping to
zero current in shutdown. The 2.25V to 5.5V input supply
voltage range makes the LTC3614 ideally suited for single
Li-Ion as well as fixed low voltage input applications. 100%
duty cycle capability provides low dropout operation,
extending the operating time in battery-powered systems.
The operating frequency is externally programmable up to
4MHz, allowing the use of small surface mount inductors.
For switching-noise-sensitive applications, the LTC3614
can be synchronized to an external clock at up to 4MHz.
Forced continuous mode operation in the LTC3614 reduces
noise and RF interference. Adjustable compensation allows
the transient response to be optimized over a wide range
of loads and output capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external catch diode, saving
external components and board space. The LTC3614
is offered in a leadless 24-pin 3mm × 5mm thermally
enhanced QFN package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 6498466, 6611131.
Typical Application
VIN
2.7V TO 5.5V
SVIN
PVIN
RUN SRLIM/DDR
TRACK/SS
RT/SYNC
LTC3614
SW
PGOOD
SGND
ITH PGND
MODE
VFB
210k
10µF
×4
330nH
665k
VOUT
2.5V
4A
47µF
×2
3614 TA01a
Efficiency and Power Loss
vs Load Current
100
90
80 1
70
60 0.1
50
40 0.01
30
20
10
0 VOUT = 2.5V
1 10
VIN = 2.8V
VIN = 3.3V
VIN = 5V
0
100 1000 10000
OUTPUT CURRENT (mA)
3614 TA01b
For more information www.linear.com/LTC3614
3614fc
1


Linear Technology Electronic Components Datasheet

LTC3614 Datasheet

4MHz Monolithic Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3614
Absolute Maximum Ratings
(Note 1)
PVIN, SVIN Voltages...................................... –0.3V to 6V
SW Voltage.................................. –0.3V to (PVIN + 0.3V)
ITH, RT/SYNC Voltages................ –0.3V to (SVIN + 0.3V)
SRLIM, TRACK/SS Voltages........ –0.3V to (SVIN + 0.3V)
MODE, RUN, VFB Voltages........... –0.3V to (SVIN + 0.3V)
PGOOD Voltage............................................. –0.3V to 6V
Operating Junction Temperature Range
(Notes 2, 11)........................................... –55°C to 150°C
Storage Temperature.............................. –65°C to 150°C
Pin Configuration
TOP VIEW
24 23 22 21
SRLIM/DDR 1
RT/SYNC 2
SGND 3
PVIN 4
SW 5
SW 6
SW 7
SW 8
25
PGND
20 PGOOD
19 RUN
18 SVIN
17 PVIN
16 SW
15 SW
14 SW
13 SW
9 10 11 12
UDD PACKAGE
24-LEAD (3mm × 5mm) PLASTIC QFN
TJMAX = 150°C, θJA = 38°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
LTC3614EUDD#PBF
LTC3614EUDD#TRPBF LFVM
24-Lead (3mm × 5mm) Plastic QFN –40°C to 125°C
LTC3614IUDD#PBF
LTC3614IUDD#TRPBF LFVM
24-Lead (3mm × 5mm) Plastic QFN –40°C to 125°C
LTC3614HUDD#PBF
LTC3614HUDD#TRPBF LFVM
24-Lead (3mm × 5mm) Plastic QFN –40°C to 150°C
LTC3614MPUDD#PBF
LTC3614MPUDD#TRPBF LFVM
24-Lead (3mm × 5mm) Plastic QFN –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/
3614fc
2 For more information www.linear.com/LTC3614


Part Number LTC3614
Description 4MHz Monolithic Synchronous Step-Down DC/DC Converter
Maker Linear
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LTC3614 Datasheet PDF






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