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Linear Technology Electronic Components Datasheet

LTC3603 Datasheet

Monolithic Synchronous Step-Down Regulator

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Features
n Wide Input Voltage Range: 4.5V to 15V
n 2.5A Output Current
n Low RDS(ON) Internal Switches: 45mΩ and 85mΩ
n Programmable Frequency: 300kHz to 3MHz
n Low Quiescent Current: 75µA
n 0.6V ±1% Reference Allows Precise,
Low Output Voltage
n 99% Maximum Duty Cycle
n Adjustable Burst Mode® Clamp
n Synchronizable to External Clock
n Power Good Output Voltage Monitor
n Overtemperature Protection
n Overvoltage Protection
n Available in 16-Lead Thermally Enhanced eMSOP
and 4mm × 4mm QFN Packages
Applications
n Point-of-Load Supplies
n Portable Instruments
n Communications Infrastructure
LTC3603
2.5A, 15V Monolithic
Synchronous Step-Down
Regulator
Description
The LTC®3603 is a high efficiency, monolithic synchronous
step-down DC/DC converter utilizing a constant-frequency,
current mode architecture. It operates from an input voltage
range of 4.5V to 15V and provides an adjustable regulated
output voltage from 0.6V to 14.5V while delivering up to
2.5A of output current. The internal synchronous power
switch with 45mΩ on-resistance increases efficiency
and eliminates the need for an external Schottky diode.
The switching frequency can either be set by an external
resistor or synchronized to an external clock. OPTI-LOOP®
compensation allows the transient response to be optimized
over a wide range of loads and output capacitors.
The LTC3603 can be configured for either Burst Mode op-
eration or forced continuous operation. Forced continuous
operation reduces noise and RF interference, while Burst
Mode operation provides the highest efficiency at light
loads. In Burst Mode operation, external control of the burst
clamp level allows the output voltage ripple to be adjusted
according to the requirements of the application.
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered
trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents including 5481178,
6580258, 6498466, 6611131, 6177787, 5705919, 5847554.
Typical Application
3.3V, 2.5A, 1MHz Step-Down Regulator
VIN
4.5V TO 15V
22µF
105k
4.32k
1nF
PVIN INTVCC
RUN BOOST
RT LTC3603
PGOOD
SW
TRACK/SS
ITH PGND
SYNC/MODE VFB
105k
1µF
0.22µF
2.2µH
VOUT
3.3V
100µF 2.5A
475k
10pF
3603 TA01
Efficiency and Power Loss vs Load Current
100
VIN = 12V
95 VOUT = 3.3V
90
EFFICIENCY
10000
1000
85
80 100
75
POWER LOSS
70 10
65
60
0.001
0.01 0.1
1
LOAD CURRENT (A)
1
10
3603 TA01b
For more information www.linear.com/LTC3603
3603fc
1


Linear Technology Electronic Components Datasheet

LTC3603 Datasheet

Monolithic Synchronous Step-Down Regulator

No Preview Available !

LTC3603
Absolute Maximum Ratings (Note 1)
PVIN Supply Voltage (DC)........................... –0.3V to 16V
PVIN Supply Transient Voltage (<1µs)........................21V
SW............................................... –0.3V to (PVIN + 0.3V)
BOOST..................................(VSW –0.3V) to (VSW + 6V)
RUN............................................................ –0.3V to 16V
All Other Pins................................................ –0.3V to 6V
Peak SW Sink and Source Current (Note 7)..............6.5A
Operating Junction Temperature Range
(Notes 2, 5, 6)..................................... –40°C to 125°C
Lead Temperature (Soldering, 10 seconds)
MSE Package..................................................... 300°C
Pin Configuration
SYNCI/NMTOVDCEC
1
2
PGOOD 3
RT 4
ITH 5
SGVNFDB
6
7
RUN 8
TOP VIEW
17
SGND
16
15
14
PPBVVOIIONNST
13 SW
12 SW
11 PGND
10 PGND
9 TRACK/SS
MSE PACKAGE
16-LEAD PLASTIC eMSOP
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
TOP VIEW
PVIN 1
PVIN 2
INTVCC 3
SYNC/MODE 4
PGOOD 5
20 19 18 17 16
21
SGND
15 PGND
14 PGND
13 PGND
12 PGND
11 TRACK/SS
6 7 8 9 10
UF PACKAGE
20-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W, θJC = 5°C/W
EXPOSED PAD (PIN 21) IS SGND, MUST BE SOLDERED TO PCB
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3603EMSE#PBF
LTC3603EMSE#TRPBF 3603
16-Lead Plastic eMSOP
–40°C to 125°C
LTC3603IMSE #PBF
LTC3603IMSE#TRPBF 3603
16-Lead Plastic eMSOP
–40°C to 125°C
LTC3603EUF#PBF
LTC3603EUF#TRPBF
3603
20-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LTC3603IUF#PBF
LTC3603IUF#TRPBF
3603
20-Lead (4mm × 4mm) 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.
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/
3603fc
2 For more information www.linear.com/LTC3603


Part Number LTC3603
Description Monolithic Synchronous Step-Down Regulator
Maker Linear
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LTC3603 Datasheet PDF






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