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Linear Technology Electronic Components Datasheet

LT3504 Datasheet

Quad 40V/1A Step-Down Switching Regulator

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Features
n Wide Input Range: 3.2V to 40V
n Four 1A Outputs
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 800mV FB Voltage
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
Applications
n Automotive Battery Regulation
n Industrial Control Supplies
n Wall Transformer Regulation
n Distributed Supply Regulation
LT3504
Quad 40V/1A Step-Down
Switching Regulator with
100% Duty Cycle Operation
Description
The LT®3504 consists of four 1A output current buck
regulators. The LT3504 has a wide operating input range
of 3.2V to 40V. An on-chip boost regulator allows each
channel to operate up to 100% duty cycle and eliminates
the need for four external charge pump circuits. The LT3504
is designed to minimize external component count and
results in a simple and small application circuit.
The LT3504 operates robustly in fault conditions. Cycle-
by-cycle peak current limit and catch diode current limit
sensing protect the part during overload conditions. Ther-
mal shutdown protects the power switches at elevated
temperatures. Soft-start helps keep the peak inductor
current under control during startup.
The LT3504 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.
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
Quad Buck Regulator in 4 × 5 QFN
VIN
5.4V to 20V
TRANSIENT TO 40V
1µF
1µF
10µH
1µF
50nF
SKY
LT3504
SW5
EN/UVLO
VIN
VIN
VIN
VIN
RUN/SS1
RUN/SS2
RUN/SS3
RUN/SS4
RT/SYNC
18.2k
GND
SW4
DA4
FB4
SW3
DA3
FB3
SW2
DA2
FB2
SW1
DA1
FB1
fSW = 1MHz
10µH
52.3k
5V/1A
10µF
6.8µH
10k
31.6k
3.3V/1A
10µF
4.7µH
10k
22.1k
2.5V/1A
22µF
3.3µH
10k
24.9k
20k
1.8V/1A
22µF
3504 TA01a
For more information www.linear.com/LT3504
LT3504 Start-Up and Shutdown
Waveform.
from 0V Up
VtoIN8(VToapndTrTahcee)n
Is Ramped
Back Down
to 0V. The Other Four Traces Are the
Output Voltages of All Four 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
CH2 1V/DIV
CH1 1V/DIV
100ms/DIV
3504 TA01b
3504fa
1


Linear Technology Electronic Components Datasheet

LT3504 Datasheet

Quad 40V/1A Step-Down Switching Regulator

No Preview Available !

LT3504
Absolute Maximum Ratings
(Note 1)
EN/UVLO Pin..............................................................40V
EN/UVLO Pin Above VIN Pin.........................................5V
VIN Pin.......................................................................40V
SKY Pin......................................................................46V
SW5 Pin.....................................................................47V
RUN/SS Pins................................................................6V
FB Pins.........................................................................6V
RT/SYNC Pin................................................................6V
PG Pin........................................................................25V
Operating Junction Temperature Range (Notes 2, 8)
LT3504EUFD........................................... –40°C to 125°C
LT3504IUFD............................................ –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
28 27 26 25 24 23
DA2 1
22 FB2
SW2 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
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT3504EUFD#PBF
LT3504EUFD#TRPBF
3504
28-Lead (4mm × 5mm) Plastic QFN
LT3504IUFD#PBF
LT3504IUFD#TRPBF
3504
28-Lead (4mm × 5mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V unless otherwise noted.
SYMBOL
CONDITIONS
MIN TYP MAX
EN/UVLO Threshold Voltage
Rising
l 1.2 1.44 1.6
EN/UVLO Threshold Voltage Hysteresis
110
EN/UVLO Threshold Current Hysteresis
VEN/UVLO = Measured Rising Threshold – 50mV
(Note 3)
1.3
Internal VIN Undervoltage Lockout
Quiescent Current (VIN) in Shutdown
Quiescent Current (VIN)
Quiescent Current (VIN)
Quiescent Current (SKY)
VEN/UVLO = 0V
VEN/UVLO = 1V (Note 4)
VVEFBN(/1U,V2L,3O,4=) =1.05.V9,VV, RVUSNK/YSS=(11,72,V3,4) = Open,
VVEFBN(/1U,V2L,3O,4=) =1.05.V9,VV, RVUSNK/YSS=(11,72,V3,4) = Open,
2.4 2.9 3.2
0.01 2
4 10
2.7
4.4
UNITS
V
mV
µA
V
µA
µA
mA
mA
3504fa
2 For more information www.linear.com/LT3504


Part Number LT3504
Description Quad 40V/1A Step-Down Switching Regulator
Maker Linear
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LT3504 Datasheet PDF






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