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Linear Technology Electronic Components Datasheet

LTC3604 Datasheet

2.5A 15V Monolithic Synchronous Step-Down Regulator

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FEATURES
n 3.6V to 15V Operating Input Voltage Range
n 2.5A Output Current
n Up to 95% Efficiency
n Very Low Duty Cycle Operation: 5% at 2.25MHz
n Adjustable Switching Frequency: 800kHz to 4MHz
n External Frequency Synchronization
n Current Mode Operation for Excellent Line and Load
Transient Response
n User Selectable Low Ripple (20mVP-P Typical)
Burst Mode® (No Load IQ = 300μA) or Forced
Continuous Operation
n 0.6V Reference Allows Low Output Voltages
n Short-Circuit Protected
n Output Voltage Tracking Capability
n Power Good Status Output
n Available in Small, Thermally Enhanced, 16-Pin QFN
(3mm × 3mm) and MSOP Packages
APPLICATIONS
n Distributed Power Systems
n Lithium-Ion Battery-Powered Instruments
n Point-of-Load Power Supplies
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and Hot Swap is a registered trademark 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.
LTC3604www.DataSheet4U.com
2.5A, 15V Monolithic
Synchronous Step-Down
Regulator
DESCRIPTION
The LTC®3604 is a high efficiency, monolithic synchronous
buck regulator using a phase-lockable controlled on-time,
current mode architecture capable of supplying up to 2.5A
of output current. The operating supply voltage range is
from 3.6V to 15V, making it suitable for a wide range of
power supply applications.
The operating frequency is programmable from 800kHz to
4MHz with an external resistor enabling the use of small
surface mount inductors. For switching noise sensitive
applications, the LTC3604 can be externally synchronized
over the same frequency range. An internal phase-locked
loop aligns the on-time of the top power MOSFET to the
internal or external clock. This unique constant frequency/
controlled on-time architecture is ideal for high step-down
ratio applications that demand high switching frequencies
and fast transient response.
The LTC3604 offers two operational modes: Burst Mode
operation and forced continuous mode to allow the user
to optimize output voltage ripple, noise, and light load
efficiency for a given application. Maximum light load
efficiency is achieved with the selection of Burst Mode
operation while forced continuous mode provides minimum
output ripple and constant frequency operation.
TYPICAL APPLICATION
High Efficiency 2.5A Step-Down Regulator
VIN
3.6V TO 15V
22μF
2.2μF
VIN BOOST
RUN
PGOOD
TRACK/SS
SW
VON
LTC3604
INTVCC
ITH
RT
MODE/SYNC
FB
SGND PGND
0.1μF
1μH
180k
22pF
40k
3604 TA01a
VOUT
3.3V
2.5A
47μF
Efficiency and Power Loss vs Load Current
100
90
80
70
60
50
40
30
20
10
0
0.001
10
1
0.1
VIN = 5V 0.01
VIN = 12V
fO = 2MHz
Burst Mode OPERATION
0.001
0.01 0.1 1 10
LOAD CURRENT (A)
3604 TA01b
3604f
1


Linear Technology Electronic Components Datasheet

LTC3604 Datasheet

2.5A 15V Monolithic Synchronous Step-Down Regulator

No Preview Available !

LTC3604
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN ............................................................. –0.3V to 16V
VIN Transient Voltage ................................................18V
BOOST .................................................... –0.3V to 18.6V
BOOST-SW................................................ –0.3V to 3.6V
INTVCC ...................................................... –0.3V to 3.6V
ITH, RT ......................................–0.3V to INTVCC + 0.3V
MODE/SYNC, FB ........................–0.3V to INTVCC + 0.3V
TRACK/SS .................................–0.3V to INTVCC + 0.3V
PGOOD, VON............................................... –0.3V to 16V
SW, RUN.......................................... –0.3V to VIN + 0.3V
SW Source Current (DC).............................................3A
Peak SW Source Current .................... Internally Limited
Operating Junction Temperature Range
(Notes 2, 3, 5) ....................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
PIN CONFIGURATION
TOP VIEW
16 15 14 13
MODE/SYNC 1
12 ITH
PGOOD 2
SW 3
17
PGND
11 FB
10 RT
SW 4
9 SGND
5678
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 45°C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
TOP VIEW
SW 1
SW 2
PGND 3
PGND 4
BOOST 5
INTVCC 6
VON 7
RT 8
17
SGND
16 PGOOD
15 MODE/SYNC
14 VIN
13 VIN
12 RUN
11 TRACK/SS
10 ITH
9 FB
MSE PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 38°C/W
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3604EUD#PBF
LTC3604EUD#TRPBF LFPT
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3604IUD#PBF
LTC3604IUD#TRPBF
LFPT
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3604EMSE#PBF
LTC3604EMSE#TRPBF 3604
16-Lead Plastic MSOP
–40°C to 125°C
LTC3604IMSE#PBF
LTC3604IMSE#TRPBF 3604
16-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/
3604f
2


Part Number LTC3604
Description 2.5A 15V Monolithic Synchronous Step-Down Regulator
Maker Linear Technology
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LTC3604 Datasheet PDF






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