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Linear Technology Electronic Components Datasheet

LTC3601 Datasheet

15V Monolithic Synchronous Step-Down Regulator

No Preview Available !

LTC3601
FEATURES
1.5A, 15V Monolithic
Synchronous Step-Down
Regulator
DESCRIPTION
n 4V to 15V Operating Input Voltage Range
n 1.5A Output Current
n Up to 96% 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 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 Programmable Soft-Start
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 Supply
www.DataSheet4U.com
L, LT, LTC, LTM, Burst Mode, 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.
The LTC®3601 is a high efficiency, monolithic synchronous
buck regulator using a phase-lockable controlled on-time,
current mode architecture capable of supplying up to 1.5A
of output current. The operating supply voltage range is
from 4V 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 LTC3601 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 LTC3601 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
VIN
4V TO 15V
22μF
2.2μF
VIN BOOST
RUN
PGOOD
TRACK
SW
VON
LTC3601
INTVCC
ITH
RT
MODE/SYNC
FB
SGND PGND
0.1μF 2.2μH
180k
10pF
VOUT
3.3V
1.5A
22μF
40k
3601 TA01a
Efficiency and Power Loss vs Load Current
100
90
80
70
60
50
40
30
20
10
0
0.001
1000
100
10
0.01 0.1
VIN = 5V
VIN = 12V
1
1 10
LOAD CURRENT (A)
3601 TA01b
3601f
1


Linear Technology Electronic Components Datasheet

LTC3601 Datasheet

15V Monolithic Synchronous Step-Down Regulator

No Preview Available !

LTC3601
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 ....................................... –0.3V to INTVCC + 0.3V
PGOOD, VON .............................................. –0.3V to 16V
SW, RUN .......................................... –0.3V to VIN + 0.3V
SW Source Current (DC).............................................2A
Peak SW Source Current..........................................3.5A
Operating Junction Temperature Range
(Notes 2, 3) ........................................... –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
11 FB
17
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
SW 1
SW 2
PGND 3
PGND 4
BOOST 5
INTVCC 6
VON 7
RT 8
TOP VIEW
17
16 PGOOD
15 MODE/SYNC
14 VIN
13 VIN
12 RUN
11 TRACK
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
wwwO.DatRaSDheeEt4RU.coImNFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3601EUD#PBF
LTC3601EUD#TRPBF LFJC
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 85°C
LTC3601IUD#PBF
LTC3601IUD#TRPBF LFJC
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3601EMSE#PBF
LTC3601EMSE#TRPBF 3601
16-Lead Plastic MSOP
–40°C to 85°C
LTC3601IMSE#PBF
LTC3601IMSE#TRPBF 3601
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/
3601f
2


Part Number LTC3601
Description 15V Monolithic Synchronous Step-Down Regulator
Maker Linear Technology
Total Page 24 Pages
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