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LTC3604IUD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTC3604
1
3604fa
For more information www.linear.com/LTC3604
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
2.5A, 15V Monolithic
Synchronous Step-Down
Regulator
n
Distributed Power Systems
n
Lithium-Ion Battery-Powered Instruments
n
Point-of-Load Power Supplies
L, LT , LT C , LT M , 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.
Efficiency and Power Loss vs Load Current
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 (20mV
P-P
Typical)
Burst Mode
®
(No Load I
Q
= 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
The LT C
®
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.
V
IN
RUN
PGOOD
TRACK/SS
LTC3604
PGNDSGND
BOOST
INTV
CC
ITH
RT
MODE/SYNC
SW
V
ON
FB
2.2µF
22pF
0.1µF
47µF
V
OUT
3.3V
2.5A
180k
40k
3604 TA01a
1µH
22µF
V
IN
3.6V TO 15V
LOAD CURRENT (A)
30
EFFICIENCY (%)
POWER LOSS (W)
90
100
20
10
80
50
70
60
40
0.001 0.1 1 10
3604 TA01b
0
0.01
10
1
0.1
0.001
0.01
V
IN
= 5V
V
IN
= 12V
f
O
= 2MHz
Burst Mode OPERATION
High Efficiency 2.5A Step-Down Regulator
LTC3604
2
3604fa
For more information www.linear.com/LTC3604
ABSOLUTE MAXIMUM RATINGS
(Note 1)
16 15 14 13
5 6 7 8
TOP VIEW
17
PGND
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
9
10
11
12
4
3
2
1MODE/SYNC
PGOOD
SW
SW
ITH
FB
RT
SGND
V
IN
V
IN
RUN
TRACK/SS
NC
BOOST
INTV
CC
V
ON
T
JMAX
= 125°C, θ
JA
= 45°C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
SW
SW
PGND
PGND
BOOST
INTV
CC
V
ON
RT
16
15
14
13
12
11
10
9
PGOOD
MODE/SYNC
V
IN
V
IN
RUN
TRACK/SS
I
TH
FB
TOP VIEW
17
SGND
MSE PACKAGE
16-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 38°C/W
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
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/
V
IN
............................................................. –0.3V to 16V
V
IN
Transient Voltage ................................................18V
BOOST
.....................................................–0.3V to 18.6V
BOOST-SW
................................................ –0.3V to 3.6V
INTV
CC
...................................................... –0.3V to 3.6V
ITH, RT.......................................–0.3V to INTV
CC
+ 0.3V
MODE/SYNC, FB
........................–0.3V to INTV
CC
+ 0.3V
TRACK/SS
.................................–0.3V to INTV
CC
+ 0.3V
PGOOD, V
ON
............................................... –0.3V to 16V
SW, RUN
.......................................... –0.3V to V
IN
+ 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
LTC3604
3
3604fa
For more information www.linear.com/LTC3604
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
VIN
Input Supply Range
l
3.6 15 V
I
Q
Input DC Supply Current
Forced Continuous Operation
Sleep Current
Shutdown
MODE = 0V
MODE = INTV
CC
, V
FB
> 0.6V
RUN = 0V
700
300
14
1000
500
25
µA
µA
µA
V
FB
Feedback Reference Voltage
l
0.594 0.600 0.606 V
∆V
LINEREG
Reference Voltage Line Regulation V
VIN
= 3.6V to 15V 0.01 %/V
∆V
LOADREG
Output Voltage Load Regulation ITH = 0.6V to 1.6V 0.1 %
I
FB
Feedback Pin Input Current V
FB
= 0.6V ±30 nA
g
m(EA)
Error Amplifier Transconductance ITH = 1.2V 2.0 mS
t
ON(MIN)
Minimum On-Time V
ON
= 1V, V
IN
= 4V 20 ns
t
OFF(MIN)
Minimum Off-Time V
IN
= 6V 40 60 ns
I
LIM
Valley Switch Current Limit 2.6 3.4 4.3 A
Negative Valley Switch Current Limit –1.7 A
f
OSC
Oscillator Frequency V
RT
= INTV
CC
R
RT
= 160k
R
RT
= 80k
1.4
1.7
3.4
2
2
4
2.6
2.3
4.6
MHz
MHz
MHz
R
DS(ON)
Top Switch On-Resistance 130 mΩ
Bottom Switch On-Resistance 100 mΩ
V
VIN(OV)
V
IN
Overvoltage Lockout Threshold V
IN
Rising
V
IN
Falling
l
l
16.8
15.8
17.5
16.5
18
17
V
V
V
INTVCC
INTV
CC
Voltage 3.6V < V
IN
< 15V 3.13 3.3 3.45 V
∆INTV
CC
INTV
CC
Load Regulation (Note 4) I
INTVCC
= 0mA to 20mA 0.6 %
V
UVLO
INTV
CC
Undervoltage Lockout
Threshold
INTV
CC
Rising, V
IN
= INTV
CC
INTV
CC
Falling, V
IN
= INTV
CC
2.75
2.45
2.9 V
V
V
RUN
RUN Threshold RUN Rising
RUN Falling
l
l
1.21
0.97
1.25
1.0
1.29
1.03
V
V
I
RUN(LKG)
RUN Leakage Current V
VIN
= 15V 0 ±3 µA
V
FB_GB
PGOOD Good-to-Bad Threshold FB Rising
FB Falling
8
–8
10
–10
%
%
V
FB_BG
PGOOD Bad-to-Good Threshold FB Rising
FB Falling
–3
3
–5
5
%
%
t
PGOOD
Power Good Filter Time 20 40 µs
R
PGOOD
PGOOD Pull-Down Resistance 10mA Load 15 Ω
I
SW(LKG)
Switch Leakage Current V
RUN
= 0V 0.01 1 µA
t
SS
Internal Soft-Start Time V
FB
from 10% to 90% Full Scale 400 700 µs
V
FB_TRACK
TRACK Pin TRACK = 0.3V 0.28 0.3 0.315 mV
I
TRACK
TRACK Pull-Up Current 1.4 µA
V
MODE/SYNC
MODE Threshold Voltage MODE V
IH
MODE V
IL
l
l
1.0
0.4
V
V
SYNC Threshold Voltage SYNC V
IH
l
0.95 V
I
MODE
MODE Input Current MODE = 0V
MODE = INTV
CC
–1.5
1.5
µA
µA
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
J
= 25°C. V
VIN
= 12V, unless otherwise specified.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3604E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization, and
correlation with statistical process controls. The LTC3604I is guaranteed
over the full –40°C to 125°C operating junction temperature range. The
maximum ambient temperature is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
resistance and other environmental factors.
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LTC3604IUD#TRPBF

Mfr. #:
Buy LTC3604IUD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2.5A, 15V Mono Sync Buck Reg
Lifecycle:
New from this manufacturer.
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