LTC7802EUFDM datasheet(1/34 Pages) AD

部件名	LTC7802EUFDM

功能描述	40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum

PDF	34 Pages

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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LTC7802

1

Rev. 0

For more information www.analog.com

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

40V Low IQ, 3MHz Dual, 2-Phase Synchronous

Step-Down Controller with Spread Spectrum

The LTC®7802 is a high performance dual step-down

synchronous DC/DC switching regulator controller that

drives all N-channel power MOSFET stages. Constant fre-

quency current mode architecture allows a phase-lockable

switching frequency of up to 3MHz. The LTC7802 oper-

ates from a wide 4.5V to 40V input supply range. Power

loss and supply noise are minimized by operating the two

controller output stages out-of-phase.

The very low no-load quiescent current extends oper-

ating runtime in battery powered systems. OPTI-LOOP

compensation allows the transient response to be opti-

mized over a wide range of output capacitance and ESR

values. The LTC7802 features a precision 0.8V reference

and power good output indicators. The MODE pin selects

among Burst Mode operation, pulse-skipping mode, or

continuous inductor current mode at light loads.

The LTC7802 additionally features spread spectrum oper-

ation which significantly reduces the peak radiated and

conducted noise on both the input and output supplies,

making it easier to comply with electromagnetic interfer-

ence (EMI) standards.

APPLICATIONS

n

Wide Input Voltage Range: 4.5V to 40V

n

Wide Output Voltage Range: 0.8V to 99% • VIN

n

Low Operating IQ: 14μA (14V to 3.3V, Channel 1 On)

n

Spread Spectrum Operation

n

RSENSE or DCR Current Sensing

n

Out-of-Phase Controllers Reduce Required Input

Capacitance and Power Supply Induced Noise

n

Programmable Fixed Frequency (100kHz to 3MHz)

n

Phase-Lockable Frequency (100kHz to 3MHz)

n

Selectable Continuous, Pulse-Skipping, or Low

Ripple, Burst Mode® Operation at Light Loads

n

Very Low Dropout Operation: 99% Duty Cycle

n

Power Good Output Voltage Monitors

n

Output Overvoltage Protection

n

Internal LDO Powers Gate Drive from VIN or EXTVCC

n

Low Shutdown IQ: 1.5μA

n

Small 28-Lead 4mm × 5mm QFN Package

n

Automotive and Transportation

n

Industrial

n

Military/Avionics

All registered trademarks and trademarks are the property of their respective owners.

VOUT2

VOUT1

VIN

0.1µF

0.9µH

2m

4.7µF

210k

68.1k

330µF

0.1µF

1.8µH

3m

0.1µF

357k

68.1k

220µF

LTC7802

SW1

BG1

TG1

BOOST1

SENSE1+

SENSE1–

RUN1 VIN RUN2 INTVCC

INTVCC

EXTVCC

VFB1

ITH1

TRACK/SS1

GND

SW2

BG2

TG2

BOOST2

SENSE2+

SENSE2–

VFB2

ITH2

TRACK/SS2

MODE

PLLIN/SPREAD

3.3V/12A

5V/10A

4.5V TO 40V

FREQ

7802 TA01a

类似零件编号 - LTC7802EUFDM

制造商	部件名	数据表	功能描述
Analog Devices	LTC7802EUFDM-3.3	1Mb / 34P	40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum

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