Switching Regulator. LT3510 Datasheet

LT3510 Regulator. Datasheet pdf. Equivalent

Part LT3510
Description Monolithic Dual Tracking 2A Step-Down Switching Regulator
Feature www.DataSheet4U.com FEATURES n n n n n n n n n n n n LT3510 Monolithic Dual Tracking 2A Step-Down .
Manufacture Linear Technology
Datasheet
Download LT3510 Datasheet



LT3510
www.DataSheet4U.com
FEATURES
n Wide Input Range: 3.1V to 25V
n Two Switching Regulators with 2A Output Capability
n Independent Supply to Each Regulator
n Adjustable/Synchronizable Fixed Frequency
Operation from 250kHz to 1.5MHz
n Antiphase Switching
n Outputs Can be Paralleled
n Independent, Sequential, Ratiometric or Absolute
Tracking Between Outputs
n Independent Soft-Start and Power Good Pins
n Enhanced Short-Circuit Protection
n Low Dropout: 95% Maximum Duty Cycle
n Low Shutdown Current: <10μA
n 20-Lead TSSOP Package with Exposed Leadframe
APPLICATIONS
n DSP Power Supplies
n Disc Drives
n DSL/Cable Modems
n Wall Transformer Regulation
n Distributed Power Regulation
n PCI Cards
, LT, LTC, and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT3510
Monolithic Dual Tracking
2A Step-Down Switching
Regulator
DESCRIPTION
The LT®3510 is a dual current mode PWM step-down
DC/DC converter with two internal 2.5A switches. Inde-
pendent input voltage, feedback, soft-start and power
good pins for each channel simplify complex power
supply tracking/sequencing requirements.
Both converters are synchronized to either a common
external clock input or a resistor programmable fixed
250kHz to 1.5MHz internal oscillator. At all frequencies, a
180° phase relationship between channels is maintained,
reducing voltage ripple and component size. Programmable
frequency allows for optimization between efficiency and
external component size.
Minimum input-to-output voltage ratios are improved
by allowing the switch to stay on through multiple clock
cycles, only switching off when the boost capacitor needs
recharging, resulting in ~95% maximum duty cycle.
Each output can be independently disabled using its own
soft-start pin, or by using the SHDN pin the entire part can
be placed in a low quiescent current shutdown mode.
The LT3510 is available in a 20-lead TSSOP package with
exposed leadframe for low thermal resistance.
TYPICAL APPLICATION
VIN
12V
4.7μF
PMEG4005
VOUT1
3.3V
2A
3.3V and 1.8V Dual 2A Step-Down Converter with Output Tracking
PMEG4005
4.7μH
VIN1
SHDN
VIN2
RT/SYNC
61.9k
BST1
0.47μF
SW1
BST2
0.47μF
SW2
B360A
LT3510
3.3μH
B360A
47μF 24.9k
8.06k
470pF
10pF 40.2k
IND1
VOUT1
IND2
VOUT2
PG1 PG2
FB1 FB2
VC1 VC2
SS/TRACK1 SS/TRACK2
GND
0.1μF
VOUT2
1.8V
10k 100μF 2A
470pF
40.2k
47pF 8.06k
3510 TA01a
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency
VOUT = 5V
VOUT = 3.3V
VOUT = 1.8V VOUT = 2.5V
VIN = 12V
IOUT2 = 0A
FREQUENCY = 500kHz
0.5 1 1.5
LOAD CURRENT (A)
2
3510 TA01b
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LT3510
LT3510www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN1/2, SHDN, PG1/2 ...................................... 25V/–0.3V
SW1/2 .................................................................... VIN1/2
BST1/2 ........................................................... 35V/–0.3V
BST1/2 Pins Above SW1/2........................................25V
IND1/2 .....................................................................±4A
VOUT1/2........................................................ VIN1/2/–0.3V
FB1/2, SS1/2, RT/SYNC............................................5.5V
VC1/2 ......................................................................±1mA
Operating Junction Temperature Range
LT3510EFE (Notes 2, 8) ..................... –40°C to 125°C
LT3510IFE (Notes 2, 8) ...................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
VIN1 1
SW1 2
20 BST1
19 SS/TRACK1
IND1 3
VOUT1 4
PG1 5
PG2 6
18 VC1
17 FB1
21 16 RT/SYNC
15 SHDN
VOUT2 7
IND2 8
SW2 9
14 FB2
13 VC2
12 SS/TRACK2
VIN2 10
11 BST2
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 45°C/W, θJC(PAD) = 10°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3510EFE#PBF
LT3510EFE#TRPBF
LT3510FE
20-Lead TSSOP
–40°C to 125°C
LT3510IFE#PBF
LT3510IFE#TRPBF
LT3510FE
20-Lead TSSOP
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3510EFE
LT3510EFE#TR
LT3510FE
20-Lead TSSOP
–40°C to 125°C
LT3510IFE
LT3510IFE#TR
LT3510FE
20-Lead TSSOP
–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.
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/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. VVIN1/2 = 15V, VBST1/2 = open, VRT/SYNC = 2V, VVOUT1/2 = open,
unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SHDN Threshold
SHDN Input Current
Minimum Input Voltage Ch 1 (Note 3)
Minimum Input Voltage Ch 2
Supply Shutdown Current Ch 1
Supply Shutdown Current Ch 2
Supply Quiescent Current Ch 1
Supply Quiescent Current Ch 2
Feedback Voltage Ch 1/2
VOUT1/2 = 0V, RT/SYNC = 133k
l 1.23 1.28 1.37
VSHDN = 1.375V
VSHDN = 1.225V
7 10 13
235
VFB1/2 = 0V, VVOUT1/2 = 0V, VIND1/2 = 0V, RT/SYNC = 133k
2.8 3
VFB1/2 = 0V, VVOUT1/2 = 0V, VIND1/2 = 0V
2.8 3
VSHDN = 0V
l 9 30
VSHDN = 0V
05
VFB1/2 = 0.9V
3.5 5
VFB1/2 = 0.9V
200 500
VVC1/2 = 1V
l 0.784 0.8 0.816
V
μA
μA
V
V
μA
μA
mA
μA
V
3510fc
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