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Linear Technology Electronic Components Datasheet

LTC3600 Datasheet

Step-Down Regulator

No Preview Available !

LTC3600
15V, 1.5A Synchronous
Rail-to-Rail Single Resistor
Step-Down Regulator
Features
n Single Resistor Programmable VOUT
n ±1% ISET Accuracy
n Tight VOUT Regulation Independent of VOUT Voltage
n Easy to Parallel for Higher Current and Heat Spreading
n Wide VOUT Range 0V to VIN – 0.5V
n High Efficiency: Up to 96%
n 1.5A Output Current
n Adjustable Frequency: 200kHz to 4MHz
n 4V to 15V VIN Range
n Current Mode Operation for Excellent Line and Load
Transient Response
n Zero Supply Current in Shutdown
n Available in Thermally Enhanced 12-Pin
(3mm × 3mm) DFN and MSOP Packages
Applications
n Voltage Tracking Supplies
n Point-of-Load Power Supplies
n Portable Instruments
n Distributed Power Systems
Description
The LTC®3600 is a high efficiency, monolithic synchronous
buck regulator whose output is programmed with just one
external resistor. The accurate internally generated 50µA
current source on the ISET pin allows the use of a single
external resistor to program an output voltage that ranges
from 0V to 0.5V below VIN. The VOUT voltage feeds directly
back to the error amplifier in unity gain fashion and equals
the ISET voltage. The operating supply voltage range is 4V
to 15V, making it suitable for dual lithium-ion battery and
5V or 12V input point-of-load power supply applications.
The operating frequency is synchronizable to an external
clock or programmable from 200kHz to 4MHz with an
external resistor. High switching frequency allows the use
of small surface mount inductors. The unique constant
on-time architecture is ideal for operating at high frequency
in high step-down ratio applications that also demand fast
load transient response.
L, LT, LTC, LTM, Linear Technology, the Linear logo and OPTI-LOOP are registered trademarks
and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919,
5847554, 6580258.
Typical Application
High Efficiency, 1MHz, 1.5A Step-Down Converter
VIN
12V
VIN
8
LTC3600
9
BOOST
RUN 50µA
5
10µF
+
ERROR
AMP
PWM CONTROL
AND SWITCH
DRIVER
SW
7
0.1µF
2.2µH
ISET
1
MODE/
SYNC INTVCC RT
6 10 3
VOUT
11
GND PGFB
13 4
ITH PGOOD
2 12
3600 TA01a
0.1µF 49.9k
1µF
VOUT
2.5V
22µF
Efficiency and Power Loss vs
Output Current
100
90
VIN = 12V
VOUT = 2.5V
80 DCM
70
POWER
LOSS
1.0
0.9
0.8
0.7
60
50 CCM
40
0.6
0.5
0.4
30 0.3
20
10
0
0.001
CCM
DCM
0.01 0.1
1
LOAD CURRENT (A)
0.2
0.1
0
10
3600 TA01b
3600fd
1


Linear Technology Electronic Components Datasheet

LTC3600 Datasheet

Step-Down Regulator

No Preview Available !

LTC3600
Absolute Maximum Ratings (Notes 1, 5)
VIN, SW Voltage.......................................... –0.3V to 16V
SW Transient Voltage (Note 6)........................–2V to 21V
VOUT, ISET Voltage.............................................0V to VIN
BOOST Voltage.............................–0.3V to VIN + INTVCC
RUN Voltage................................................–0.3V to 12V
INTVCC Voltage............................................. –0.3V to 7V
ITH, RT Voltage...................................... –0.3V to INTVCC
MODE/SYNC, PGFB, PGOOD Voltage..... –0.3V to INTVCC
Operating Junction Temperature Range
(Notes 2, 5)............................................. –40°C to 125°C
MSE Package Lead Temperature
(Soldering, 10 sec)................................................. 300°C
Pin Configuration
TOP VIEW
ISET 1
12 PGOOD
ITH 2
11 VOUT
RT 3
PGFB 4
13
GND
10 INTVCC
9 BOOST
RUN 5
MODE/SYNC 6
8 VIN
7 SW
DD PACKAGE
12-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 55°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
ISET 1
12 PGOOD
ITH 2
11 VOUT
RT 3
PGFB 4
13
GND
10 INTVCC
9 BOOST
RUN 5
MODE/SYNC 6
8 VIN
7 SW
MSE PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
Order Information http://www.linear.com/product/LTC3600#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3600EDD#PBF
LTC3600EDD#TRPBF
LFXB
12-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3600IDD#PBF
LTC3600IDD#TRPBF
LFXB
12-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3600EMSE#PBF
LTC3600EMSE#TRPBF 3600
12-Lead Plastic MSOP
–40°C to 125°C
LTC3600IMSE#PBF
LTC3600IMSE#TRPBF 3600
12-Lead Plastic MSOP
–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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3600fd
2


Part Number LTC3600
Description Step-Down Regulator
Maker Linear
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LTC3600 Datasheet PDF






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