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Linear Technology Electronic Components Datasheet

LTC3605A Datasheet

5A Synchronous Step-Down Regulator

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Features
nn High Efficiency: Up to 96%
nn 5A Output Current
nn 4V to 20V VIN Range
nn Integrated Power N-Channel MOSFETs
(70mΩ Top and 35mΩ Bottom)
nn Adjustable Frequency 800kHz to 4MHz
nn PolyPhase® Operation (Up to 12 Phases)
nn Output Tracking
nn 0.6V ±1% Reference Accuracy
nn Current Mode Operation for Excellent Line and Load
Transient Response
nn Shutdown Mode Draws Less Than 15µA Supply Current
nn LTC3605: 15V Absolute Maximum VIN
nn LTC3605A: 22V Absolute Maximum VIN
nn The LTC3605A Is Pin Compatible with the LTC3605
nn Available in 24-Pin (4mm × 4mm) QFN Package
Applications
nn Point of Load Power Supply
nn Portable Instruments
nn Distributed Power Systems
nn Battery-Powered Equipment
LTC3605A
20V, 5A Synchronous
Step-Down Regulator
Description
The LTC®3605A is a high efficiency, monolithic synchro-
nous buck regulator using a phase lockable controlled
on-time constant frequency, current mode architecture.
PolyPhase operation allows multiple LTC3605A regula-
tors to run out of phase while using minimal input and
output capacitance. The operating supply voltage range
is from 20V down to 4V, making it suitable for dual, triple
or quadruple lithium-ion battery inputs as well as point
of load power supply applications from a 12V or 5V rail.
The operating frequency is programmable from 800kHz to
4MHz with an external resistor. The high frequency capa-
bility allows the use of small surface mount inductors. For
switching noise sensitive applications, it can be externally
synchronized from 800kHz to 4MHz. The PHMODE pin
allows user control of the phase of the outgoing clock
signal. The unique constant frequency/controlled on-time
architecture is ideal for high step-down ratio applications
that are operating at high frequency while demanding
fast transient response. Two internal phase-lock loops
synchronize the internal oscillator to the external clock
and also servos the regulator on-time to lock on to either
the internal clock or the external clock if it’s present.
L, LT, LTC, LTM, PolyPhase, OPTI-LOOP, 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
4V TO 20V
High Efficiency 1MHz, 5A Step-Down Regulator
22µF
×2
VIN
PVIN SVIN
CLKOUT INTVCC
CLKIN
PGOOD BOOST
LTC3605A
SW
VON
RUN FB
ITH
RT
162k
2.2µF
0.1µF 1µH
11.5k
16k
220pF
3605A TA01a
2.55k
VOUT
3.3V
47µF
×2
PGND
Efficiency and Power Loss
100
90
VOUT = 3.3V
10
80
70 1
60
50
40
30 0.1
20
10
0
0.01
0.1 1
LOAD CURRENT (A)
VIN = 8V
VIN = 12V
VIN = 20V 0.01
10
3605A TA01b
For more information www.linear.com/LTC3605A
3605afg
1


Linear Technology Electronic Components Datasheet

LTC3605A Datasheet

5A Synchronous Step-Down Regulator

No Preview Available !

LTC3605A
Absolute Maximum Ratings
(Note 1)
PVIN, SVIN, SW Voltage.............................. –0.3V to 22V
SW Transient Voltage...................................–2V to 24.5V
BOOST Voltage...........................–0.3V to PVIN + INTVCC
RUN Voltage............................................... –0.3V to 22V
VON Voltage................................................ –0.3V to SVIN
INTVCC Voltage.......................................... –0.3V to 3.6V
ITH, RT, CLKOUT, PGOOD Voltage......... –0.3V to INTVCC
CLKIN, PHMODE, MODE Voltage........... –0.3V to INTVCC
TRACK/SS, FB Voltage........................... –0.3V to INTVCC
Operating Junction Temperature Range
(Note 2)................................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 125°C
Pin Configuration
TOP VIEW
24 23 22 21 20 19
RT 1
PHMODE 2
MODE 3
FB 4
TRACK/SS 5
ITH 6
25
PGND
18 PVIN
17 PVIN
16 SW
15 SW
14 SW
13 SW
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
Order Information http://www.linear.com/product/LTC3605A#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3605AEUF#PBF
LTC3605AEUF#TRPBF 3605A
24-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LTC3605AIUF#PBF
LTC3605AIUF#TRPBF
3605A
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.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ ≈ TA = 25°C (Note 2). VIN = 12V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
SVIN
PVIN
IQ
VFB
DVFB(LINE)
DVFB(LOAD)
IFB
gm (EA)
tON(MIN)
tOFF(MIN)
SVIN Supply Range
VIN Power Supply Range
Input DC Supply Current
Active
Shutdown
Feedback Reference Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Feedback Pin Input Current
Error Amplifier Transconductance
Minimum On-Time
Minimum Off-Time
(Note 3)
Mode = 0, RT = 162k
VIN =12V, RUN = 0
ITH =1.2V (Note 4)
VIN = 4V to 20V, ITH = 1.2V
ITH = 1.2V
4
1.2
l 0.594
l
l
1.15
1.5
11
0.600
0.001
0.1
1.35
40
70
20
20
5
40
0.606
0.03
0.3
±30
1.6
UNITS
V
V
mA
µA
V
%/V
%
nA
mS
ns
ns
3605afg
2 For more information www.linear.com/LTC3605A


Part Number LTC3605A
Description 5A Synchronous Step-Down Regulator
Maker Linear
Total Page 22 Pages
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