LT3501EFE Linear Technology, LT3501EFE Datasheet

LT3501EFE

Manufacturer Part Number

LT3501EFE

Description

IC,SMPS CONTROLLER,CURRENT-MODE,BIPOLAR,TSSOP,20PIN,PLASTIC

Manufacturer

Linear Technology

Datasheets

1.LT3501EFE-TRPBF.pdf (28 pages)

2.LT3501EFE.pdf (28 pages)

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FEATURES

APPLICATIONS

■

TYPICAL APPLICATION

12V

Wide Input Range: 3.1V to 25V

Two Switching Regulators with 3A Output Capability

Independent Supply to Each Regulator

Adjustable/Synchronizable Fixed Frequency

Operation from 250kHz to 1.5MHz

Antiphase Switching

Outputs Can be Paralleled

Independent, Sequential, Ratiometric or Absolute

Tracking Between Outputs

Independent Soft-Start and Power Good Pins

Enhanced Short-Circuit Protection

Low Dropout: 95% Maximum Duty Cycle

Low Shutdown Current: <10µA

20-Lead TSSOP Package with Exposed Leadframe

DSP Power Supplies

Disc Drives

DSL/Cable Modems

Wall Transformer Regulation

Distributed Power Regulation

PMEG4005

OUT1

3.3V

4.7µF

3.3V and 1.8V Dual 3A Step-Down Converter with Output Tracking

47µF

PMEG4005

8.06k

24.9k

4.7µH

10pF

40.2k

470pF

B360A

0.47µF

0.1µF

SHDN

BST1

SW1

IND1

PG1

FB1

SS/TRACK1

OUT1

IN1

LT3501

GND

SS/TRACK2

IN2

/SYNC

BST2

IND2

SW2

OUT2

PG2

FB2

0.47µF

61.9k

40.2k

470pF

DESCRIPTION

3.3µH

B360A

The LT

DC/DC converter with two internal 3.5A 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 ﬁ xed

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 efﬁ ciency 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 LT3501 is available in a 20-lead TSSOP package with

exposed leadframe for low thermal resistance.

All other trademarks are the property of their respective owners.

, LT, LTC, and LTM are registered trademarks of Linear Technology Corporation.

47pF

10k

Monolithic Dual Tracking

3A Step-Down Switching

8.06k

3501 TA01a

3501 is a dual current mode PWM step-down

100µF

1.8V

OUT2

100

0.5

OUT1

Regulator

LOAD CURRENT (A)

= 5V

= 1.8V

Efﬁ ciency

1.5

FREQUENCY = 500kHz

OUT2

LT3501

= 12V

OUT1

= 0A

= 2.5V

= 3.3V

2.5

3501 TA01b

3501fb

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