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Linear Technology Electronic Components Datasheet

LT3514 Datasheet

Triple Step-Down Switching Regulator

No Preview Available !

FEATURES
n Wide Input Voltage Range: 3.2V to 36V
(40V Transient)
n Three Outputs: 2A, 1A, 1A
n 100% Duty Cycle Operation
n Resistor-Programmed Constant Frequency
n Short-Circuit Robust
n Wide SYNC Range: 350kHz to 2.2MHz
n Anti-Phase Switching Reduces Ripple
n Feedback Voltage: 800mV
n Independent Run/Soft-Start Pins
n Shutdown with UVLO
n Internal Compensation
n Thermal Shutdown
n Tiny 28-Lead (4mm × 5mm) Thermally Enhanced
QFN Package
n 24-Lead Exposed Pad TSSOP
APPLICATIONS
n Automotive Battery Regulation
n Industrial Control Supplies
n Wall Transformer Regulation
n Distributed Supply Regulation
LT3514
Triple Step-Down Switching
Regulator with 100%
Duty Cycle Operation
DESCRIPTION
The LT®3514 consists of three buck regulators (2A, 1A,
1A output current). The device has a wide operating input
range of 3.2V to 36V. An on-chip boost regulator allows
each channel to operate up to 100% duty cycle. The LT3514
is designed to minimize external component count and
results in a simple and small application circuit.
The LT3514 operates robustly in fault conditions. Cycle-
by-cycle peak current limit and catch diode current limit
sensing protect the IC during overload conditions. Ther-
mal shutdown protects the power switches at elevated
temperatures. Soft-start helps control the peak inductor
current during startup.
The LT3514 also features output voltage tracking and
sequencing, programmable frequency, programmable
undervoltage lockout, and a power good pin to indicate
when all outputs are in regulation.
The LT3514 has one fewer channel (CH2) than the LT3504,
and has one channel (CH3) that outputs 2A instead of 1A.
The LT3514 in QFN is pin compatible with the LT3504. The
LT3504 provides four 1A outputs.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
Triple Buck Regulator
VIN
5.4V TO 20V
TRANSIENT TO 40V
1µF
1µF
×2
SKY SW1
SW5
10µH
LT3514
DA1
FB1
VIN
VIN
EN/UVLO
SW3
PG PG
DA3
FB3
47nF
18.2k
1MHz
RUN/SS1
RUN/SS3
RUN/SS4
RT/SYNC
SW4
DA4
FB4
GND
3.3µH
4.7µH
8.2µH
100pF
12.7k
10.2k
47pF
31.6k
10.2k
22pF
53.6k
10.2k
1.8V/1A
22µF
3.3V/2A
47µF
5V/1A
22µF
3514 TA01a
LT3514 Start-Up and Shutdown
Waveform.
from OV Up
VtoIN8(VToapndTrTahceen)
Is Ramped
Back Down
to 0V. The Other Three Traces Are the
Output Voltages of All Three Channels
5V CHANNEL BEGINS
100% DC OPERATION
3.3V CHANNEL BEGINS
100% DC OPERATION
VIN 1V/DIV
CH4 1V/DIV
UVLO = ~2.9V
PARTS SHUTS
OFF
CH3 1V/DIV
CH1 1V/DIV
100ms/DIV
3514 TA01b
For more information www.linear.com/LT3514
3514fa
1


Linear Technology Electronic Components Datasheet

LT3514 Datasheet

Triple Step-Down Switching Regulator

No Preview Available !

LT3514
ABSOLUTE MAXIMUM RATINGS (Note 1)
EN/UVLO....................................................................40V
EN/UVLO Pin Above VIN...............................................5V
VIN.............................................................................40V
SKY............................................................................46V
SW5...........................................................................47V
RUN/SS........................................................................6V
FB ................................................................................6V
RT/SYNC......................................................................6V
PG..............................................................................25V
Operating Junction Temperature Range (Notes 2, 7)
LT3514EUFD....................................... –40°C to 125°C
LT3514IUFD........................................ –40°C to 125°C
LT3514EFE.......................................... –40°C to 125°C
LT3514IFE........................................... –40°C to 125°C
LT3514HFE.......................................... –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23
NC 1
22 NC
NC 2
21 FB3
DA3 3
20 FB1
SW3 4
SW1 5
29 19 FB4
GND 18 GND
DA1 6
17 RT/SYNC
SW4 7
16 EN/UVLO
DA4 8
15 RUN/SS3
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
θJA = 43°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
VIN 1
NC 2
24 SKY
23 SW5
DA3 3
22 GND
SW3 4
21 PG
SW3 5
20 FB3
SW1 6
DA1 7
25 19 FB1
GND 18 FB4
SW4 8
17 RT/SYNC
DA4 9
16 EN/UVLO
NC 10
15 RUN/SS3
VIN 11
VIN 12
14 RUN/SS1
13 RUN/SS4
FE PACKAGE
24-LEAD PLASTIC TSSOP
θJA = 33°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3514EUFD#PBF
LT3514EUFD#TRPBF
3514
28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LT3514IUFD#PBF
LT3514IUFD#TRPBF
3514
28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LT3514EFE#PBF
LT3514EFE#TRPBF
LT3514FE
24-Lead Plastic TSSOP
–40°C to 125°C
LT3514IFE#PBF
LT3514IFE#TRPBF
LT3514FE
24-Lead Plastic TSSOP
–40°C to 125°C
LT3514HFE#PBF
LT3514HFE#TRPBF
LT3514FE
24-Lead Plastic TSSOP
–40°C to 150°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/
2 For more information www.linear.com/LT3514
3514fa


Part Number LT3514
Description Triple Step-Down Switching Regulator
Maker Linear
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LT3514 Datasheet PDF






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