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Linear Technology Electronic Components Datasheet

LTC3623 Datasheet

Rail-to-Rail Synchronous Buck Regulator

No Preview Available !

LTC3623
15V, ±5A Rail-to-Rail
Synchronous Buck Regulator
Features
nn Single Resistor Programmable VOUT: 0V to VIN – 0.5V
nn Silent Switcher® Architecture
nn IISET Accuracy: ±1%
nn Tight VOUT Regulation Across VOUT Range
nn Output Current Monitor Accuracy: ±5%
nn Programmable Wire Drop Compensation
nn Easy to Parallel for Higher Current and Heat Spreading
nn Input Supply Voltage Regulation Loop
nn High Efficiency: Up to 96%
nn Output Current: ±5A
nn Integrated N-MOSFETs (60mΩ Top & 30mΩ Bottom)
nn Adjustable Switching Frequency: 400kHz to 4MHz
nn VIN Range: 4V to 15V
nn Current Mode Operation for Excellent Line and Load
Transient Response
nn Shutdown Mode Draws Less Than 1µA Supply Current
nn Low Profile 24-Lead 3mm × 5mm QFN Package
Applications
nn Tracking Supply or DDR Memory Supply
nn ASIC Substrate Biasing
nn Point-of-Load (POL) Power Supply
nn Portable Instruments, Battery-Powered Equipment
nn Thermo Electric Cooler (TEC) Systems
Description
The LTC®3623 is a high efficiency, monolithic synchro-
nous buck regulator in which the output voltage is pro-
grammed with a single external resistor. The accurate
internally generated 50µA current source on the ISET pin
allows the user to program an output voltage from 0V
to 0.5V below VIN. The user can also directly drive the
ISET pin with an external voltage supply to program the
converter’s VOUT. The VOUT voltage is fed directly back
to the error amplifier to be regulated to the ISET voltage.
The operating supply voltage range for the SVIN pin is from
15V down to 4V, while the PVIN pin’s voltage range is 15V
down to 1.5V, making it suitable for dual Li-Ion batteries
and for taking power from a 12V or 5V rail.
The operating frequency is programmable from 400kHz
to 4MHz with an external RT resistor. Higher switching fre-
quency allows the use of smaller surface mount inductors
while lower frequency allows for higher power efficiency.
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.
L, LT, LTC, LTM, OPTI-LOOP, Silent Switcher, Linear Technology and the Linear logo are
registered trademarks of Analog Devices, Inc. All other trademarks are the property of their
respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5847554, 6580258.
Typical Application
VIN
(5.5V TO 15V)
PVIN
SVIN
22µF
RUN
BOOST
LTC3623EUD
50µA
ERROR
AMP
PWM
CONTROL
AND
SWITCH
DRIVER
VIN_REG
IOUT/50k
0.1µF
1µH
SW
PGND
VOUT
47µF
VOUT
5V
5A
100k 10k
1µF
0.1µF
10nF
3623 TA01
For more information www.linear.com/LTC3623
Efficiency and Power Loss
vs Load Current
100
90
VIN = 12V
VOUT = 5V
80
70 DCM
60
50
40 CCM
3.0
POWER
LOSS
2.4
1.8
1.2
30
20
10
0
0.001
CCM
DCM
0.01 0.1
1
LOAD CURRENT (A)
0.6
0
10
3623 TA01a
3623fa
1


Linear Technology Electronic Components Datasheet

LTC3623 Datasheet

Rail-to-Rail Synchronous Buck Regulator

No Preview Available !

LTC3623
Absolute Maximum Ratings
(Note 1)
PVIN, SVIN Voltage...................................... –0.3V to 17V
VOUT, ISET Voltage..........................................–0.3 to VIN
BOOST Voltage............................... SW –0.3V to SW+6V
RUN Voltage.............................................. –0.3V to SVIN
MODE/SYNC Voltage.................................... –0.3V to 6V
ITH, RT, VIN_REG Voltage..................... –0.3V to INTVCC
IMON, PGOOD, PGFB Voltage................ –0.3V to INTVCC
GSNS Voltage..............................................–0.3V to 12V
Operating Junction Temperature Range
(Notes 4, 5).............................................. –40°C to 125°C
Pin Configuration
TOP VIEW
ISET 1
PGOOD 2
RUN 3
GSNS 4
PVIN 5
SW 6
NC 7
MODE/SYNC 8
24 23 22 21
25
PGND
9 10 11 12
20 PGFB
19 INTVCC
18 BOOST
17 SVIN
16 PVIN
15 SW
14 NC
13 VOUT
UDD PACKAGE
24-LEAD (3mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 36°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
Order Information
(http://www.linear.com/product/LTC3623#orderinfo)
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3623EUDD#PBF
LTC3623EUDD#TRPBF LGMW
24-Lead (3mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3623IUDD#PBF
LTC3623IUDD#TRPBF LGMW
24-Lead (3mm × 5mm) 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.
3623fa
2 For more information www.linear.com/LTC3623


Part Number LTC3623
Description Rail-to-Rail Synchronous Buck Regulator
Maker Linear
Total Page 30 Pages
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