ltc1702i Linear Technology Corporation, ltc1702i Datasheet

ltc1702i

Manufacturer Part Number

ltc1702i

Description

Dual 550khz Synchronous 2-phase Switching Regulator Controller

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC1702I.pdf (36 pages)

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FEATURES

TYPICAL APPLICATIO

■

APPLICATIO S

■

is a registered trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents including 5481178,

5847554, 6304066, 6307356, 6580258.

PWRGD1

AT 15A

OUT1

2.5V

Two Independent Controllers in One Package

Two Sides Run Out-of-Phase to Minimize C

All N-Channel External MOSFET Architecture

No External Current Sense Resistors

Excellent Output Regulation: 1% Total Output

Accuracy

550kHz Switching Frequency Minimizes External

Component Size

1A to 25A Output Current per Channel

High Efficiency over Wide Load Current Range

Quiescent Current Drops Below 100µA in Shutdown

Small 24-Pin Narrow SSOP Package

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

Microprocessor Core and I/O Supplies

Multiple Logic Supply Generator

Distributed Power Applications

High Efficiency Power Conversion

D1, D2: MOTOROLA MBR0520LT1

D3, D4: MOTOROLA MBRS320T3

L1, L2: SUMIDA CEP125-1R0

Q1 TO Q8: FAIRCHILD FDS6670A

OUT1

: KEMET TS10X337M010AS

, C

OUT2

1µF

10k

: PANASONIC EEFUE0G181R

180µF

×4

OUT1

4.75k

10k

1.2k

1µH

1µF

820pF

47k

680pF

27pF

2-Phase Switching Regulator Controller

Dual Output High Power 3.3V/2.5V Logic Supply

1µF

27k

1µF

BOOST1

BG1

TG1

SW1

PGOOD1

FCB

RUN/SS

COMP1

SGND

FB1

MAX1

LTC1702

RUN/SS2

DESCRIPTIO

PGOOD2

The LTC

mized for high efficiency with low input voltages. It includes

two complete, on-chip, independent switching regulator

controllers each designed to drive a pair of external N-channel

MOSFET devices in a voltage mode feedback, synchronous

buck configuration. The LTC1702 uses a constant-frequency,

true PWM design switching at 550kHz, minimizing external

component size and cost and maximizing load transient

performance. The synchronous buck architecture automati-

cally shifts to discontinuous and then to Burst Mode

operation as the output load decreases, ensuring maximum

efficiency over a wide range of load currents.

The LTC1702 features an onboard reference trimmed to

0.5% and can provide better than 1% regulation at the

converter outputs. Open-drain logic outputs indicate whether

either output has risen to within 5% of the final output voltage

and an optional latching FAULT mode protects the load if the

output rises 15% above the intended voltage. Each channel

can be enabled independently; with both channels disabled,

the LTC1702 shuts down and supply current drops below

100µA.

BOOST2

COMP2

FAULT

PGND

MAX2

SW2

BG2

TG2

FB2

Dual 550kHz Synchronous

10Ω

= 5V ±10%

1702 TA01

10µF

1702 is a dual switching regulator controller opti-

27k

10µF

1µF

330µF

×3

27pF

3300pF

68k

680pF

1µF

1µH

1.6k

15.8k

4.99k

LTC1702

180µF

×4

OUT2

10k

3.3V/15A

PWRGD2

FAULT

OUT2

1702fa

1µF

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