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Linear Dimensions Semiconductor

LTC3605 Datasheet Preview

LTC3605 Datasheet

5A Synchronous Step-Down Regulator

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FEATURES
n High Efficiency: Up to 96%
n 5A Output Current
n 4V to 15V VIN Range
n Integrated Power N-Channel MOSFETs
(70mΩ Top and 35mΩ Bottom)
n Adjustable Frequency 800kHz to 4MHz
n PolyPhase® Operation (Up to 12 Phases)
n Output Tracking
n 0.6V ±1% Reference Accuracy
n Current Mode Operation for Excellent Line and Load
Transient Response
n Shutdown Mode Draws Less than 15μA Supply
Current
n Available in 24-Pin (4mm × 4mm) QFN Package
APPLICATIONS
n Point of Load Power Supply
n Portable Instruments
n Distributed Power Systems
n Battery-Powered Equipment
LTC3605
15V, 5A Synchronous
Step-Down Regulator
DESCRIPTION
The LTC®3605 is a high efficiency, monolithic synchronous
buck regulator using a phase lockable controlled on-time
constant frequency, current mode architecture. PolyPhase
operation allows multiple LTC3605 regulators to run out of
phase while using minimal input and output capacitance.
The operating supply voltage range is from 15V down to
4V, making it suitable for dual 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 capabil-
ity 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 and Polyphase 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 15V
High Efficiency 1MHz, 5A Step-Down Regulator
22μF
s2
VIN
PVIN
SVIN
CLKOUT INTVCC
CLKIN
PGOOD BOOST
LTC3605
SW
VON
RUN FB
ITH
RT
162k
2.2μF
0.1μF L
11.5k
16k
220pF
3605 TA01a
2.55k
VOUT
3.3V
47μF
s2
PGND
Efficiency and Power Loss
100
VIN = 12V
90 f = 1MHz
VOUT = 3.3V
10
80
70
VOUT = 1.2V
60
50
1
40
30
VOUT = 3.3V VOUT = 1.2V
0
20
10
0 0.1
10
100
1000
10000
OUTPUT CURRENT (mA)
3605 TA01b
3605fa
1




Linear Dimensions Semiconductor

LTC3605 Datasheet Preview

LTC3605 Datasheet

5A Synchronous Step-Down Regulator

No Preview Available !

LTC3605www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PVIN, SVIN, SW Voltage.............................. –0.3V to 15V
PVIN, SW Transient Voltage ........................ –2V to 17.5V
BOOST Voltage .......................... –0.3V to PVIN + INTVCC
RUN Voltage ............................................. –0.3V to SVIN
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 Temperature Range (Note 2)....–40°C to 85°C
Junction Temperature (Note 5) ............................. 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
18 PVIN
17 PVIN
16 SW
25
15 SW
14 SW
13 SW
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
LTC3605EUF#PBF
LTC3605EUF#TRPBF
3605
24-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
TEMPERATURE RANGE
–40°C to 85°C
3605fa
2


Part Number LTC3605
Description 5A Synchronous Step-Down Regulator
Maker Linear Dimensions Semiconductor
Total Page 20 Pages
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