Linear Technology Electronic Components Datasheet

LTC3100 Datasheet

1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO

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FEATURES

n Extremely Compact Triple-Rail Solution

n Burst Mode® Operation, IQ = 15µA

n 1.5MHz Fixed Frequency Operation

n Power Good Indicators

n 700mA Synchronous Step-Up DC/DC

0.65V to 5V VIN Range

1.5V to 5.25V VOUT Range

94% Peak Efficiency

VIN > VOUT Operation

Output Disconnect

n 250mA Synchronous Step-Down DC/DC

1.8V to 5.5V VIN Range

0.6V to 5.5V VOUT Range

n LDO (VIN Internally Tied to VBST)

0.6V to 5.25V VOUT Range

200mV Dropout Voltage at 100mA

n Available in a 16-Lead 3mm × 3mm QFN Package

APPLICATIONS

n Bar Code Readers

n Medical Instruments

n Low Power Portable Electronic Devices

LTC3100

1.5MHz Synchronous Dual

Channel DC/DC Converter

and 100mA LDO

DESCRIPTION

The LTC®3100 combines a high efficiency 700mA syn-

chronous step-up converter, a 250mA synchronous step-

down converter and a 100mA LDO regulator. The LTC3100

features a wide input voltage range of 0.65V to 5V. The

step-down converter can be powered by the output of

the step-up converter or from a separate power source

between 1.8V and 5.5V. The LDO can also be used as a

sequencing switch on the output of the boost.

A switching frequency of 1.5MHz minimizes solution foot-

print by allowing the use of tiny, low profile inductors and

ceramic capacitors. The switching regulators use current

mode control and are internally compensated, reducing

external parts count. Each converter automatically transi-

tions to Burst Mode operation to maintain high efficiency

over the full load range. Burst Mode operation can be

disabled for low noise applications. The integrated LDO

provides a third low noise, low dropout supply.

Anti-ringing circuitry reduces EMI by damping the boost

inductor in discontinuous mode. Additional features

include shutdown current of under 1µA and overtem-

perature shutdown. The LTC3100 is housed in a 16-lead

3mm × 3mm 0.75mm QFN package.

, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology

Corporation. All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

Two-Cell, Triple Output Converter

3.3µH

VBATT

1.6V TO 3.2V

2.2µF

SWBST VINBK VBST

VINBST

FBBST

LTC3100

PGBST

VLDO

FF EN_BURST

BOOST OFF ON

LDO OFF ON

BUCK OFF ON

MODE

RUNBST

FBLDO

SWBK

4.7µH

RUNLDO

FBBK

RUNBK GND

PGBK

3100 TA01a

1.87M

1.07M

102k

25.5k

10µF

×2

2.2µF

10µF

3.3V AT 100mA

VBOOST

BOOST_GOOD

3V AT 50mA

VLDO

1.8V AT 200mA

VBUCK

BUCK_GOOD

Efficiency and Power Loss

vs Load Current, VIN = 2.4V

100

0.01

1000

100

BOOST

BUCK

0.1

PL, BOOST

PL, BUCK

0.01

0.1

10 100 1000

LOAD CURRENT (mA)

3100 TA01b

For more information www.linear.com/LTC3100

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Linear Technology Electronic Components Datasheet

LTC3100 Datasheet

1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO

No Preview Available !

LTC3100

ABSOLUTE MAXIMUM RATINGS

(Note 1)

VINBST and VINBK Voltage ............................... –0.3 to 6V

SWBST, SWBK DC Voltage.............................. –0.3 to 6V

SWBST, SWBK Pulsed (< 100ns) Voltage....... –0.3 to 7V

FBBST, FBBK, FBLDO, PGBST, PGBK Voltage.. –0.3 to 6V

MODE, RUNBST, RUNBK, RUNLDO Voltage.... –0.3 to 6V

VBST, VLDO...................................................... –0.3 to 6V

Operating Temperature (Notes 2, 5)..........–40°C to 85°C

Storage Temperature Range....................–65°C to 125°C

PIN CONFIGURATION

TOP VIEW

16 15 14 13

SWBST 1

12 FBBST

VBST 2

VLDO 3

SWBK 4

11 FBLDO

10 RUNLDO

9 FBBK

5678

UD PACKAGE

16-LEAD (3mm × 3mm) PLASTIC QFN

TJMAX = 125°C, θJA = 68°C/W, 4-LAYER BOARD

EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB (NOTE 6)

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING

PACKAGE DESCRIPTION

LTC3100EUD#PBF

LTC3100EUD#TRPBF

LDJR

16-Lead (3mm × 3mm) 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 85°C

ELECTRICAL CHARACTERISTICS: STEP-UP CONVERTER The l denotes the specifications

which apply over the full operating temperature range. Extended commercial grade: –40°C to 85°C, VINBST = 1.2V, VBST = 3.3V,

TA = 25°C, unless otherwise noted.

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Minimum Start-Up Voltage

ILOAD = 1mA

0.65 0.90

Input Voltage Range

After Start-Up (Minimum Voltage Is Load Dependent)

l 0.5

Output Voltage Adjust Range

l 1.5

5.25

Feedback Voltage

l 1.182 1.200 1.218

Feedback Input Current

FBBST = 1.2V

Quiescent Current (VIN): Shutdown RUNBST = 0V, Not Including Switch Leakage, VBST = 0V, VINBK = 0V

0.01

µA

Quiescent Current: Active

Quiescent Current: Burst Mode

Operation

Measured on VBST (Note 4), RUNBK = 0V, RUNLDO = 0V

Measured on VBST, FBBST > 1.25V

MODE = 1V, RUNLDO = 0V

MODE = 1V, RUNLDO = 1V

300

500

µA

N-Channel MOSFET Switch Leakage SWBST = 5V, VBST= 5V

Current

0.1

µA

P-Channel MOSFET Switch Leakage SWBST = 0V, VBST = 5V

Current

0.1

µA

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For more information www.linear.com/LTC3100

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LTC3100 Datasheet

1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO

LTC3100 Datasheet

1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO

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