LT3757 datasheet(1/36 Pages) LINER

номер детали	LT3757

подробное описание детали	PolyPhase Synchronous Boost Controller

PDF	36 Pages

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производитель	LINER [Linear Technology]

домашняя страница	http://www.linear.com

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LTC3787

1

3787fc

n Industrial

n Automotive

n Medical

n Military

TYPICAL APPLICATION

n 2-Phase Operation Reduces Required Input and

Output Capacitance and Power Supply Induced Noise

n Synchronous Operation for Highest Efficiency and

Reduced Heat Dissipation

n Wide VIN Range: 4.5V to 38V (40V Abs Max) and

Operates Down to 2.5V After Start-Up

n Output Voltage Up to 60V

n ±1% 1.200V Reference Voltage

n RSENSE or Inductor DCR Current Sensing

n 100% Duty Cycle Capability for Synchronous MOSFET

n Low Quiescent Current: 135μA

n Phase-Lockable Frequency (75kHz to 850kHz)

n Programmable Fixed Frequency (50kHz to 900kHz)

n Power Good Output Voltage Monitor

n Low Shutdown Current, IQ < 8μA

n Internal LDO Powers Gate Drive from VBIAS or EXTVCC

n Thermally Enhanced Low Profile 28-Pin 4mm × 5mm

QFN Package and Narrow SSOP Package

FEATURES

DESCRIPTION

PolyPhase Synchronous

Boost Controller

The LTC®3787 is a high performance PolyPhase® single

output synchronous boost converter controller that drives

two N-channel power MOSFET stages out-of-phase.

Multiphase operation reduces input and output capacitor

requirements and allows the use of smaller inductors than

the single-phase equivalent. Synchronous rectification in-

creases efficiency, reduces power losses and eases thermal

requirements, enabling high power boost applications.

A 4.5V to 38V input supply range encompasses a wide

range of system architectures and battery chemistries.

When biased from the output of the boost converter or

another auxiliary supply, the LTC3787 can operate from

an input supply as low as 2.5V after start-up. The operat-

ing frequency can be set for a 50kHz to 900kHz range or

synchronized to an external clock using the internal PLL.

PolyPhase operation allows the LTC3787 to be configured

for 2-, 3-, 4-, 6- and 12-phase operation.

The SS pin ramps the output voltage during start-up. The

PLLIN/MODE pin selects Burst Mode® operation, pulse-

skipping mode or forced continuous mode at light loads.

APPLICATIONS

L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, OPTI-LOOP and PolyPhase

are registered trademarks and No RSENSE and ThinSOT are trademarks of Linear Technology

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

U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.

15nF

4.7μF

8.66k

12.1k

VOUT

24V AT 10A

VIN

VIN 4.5V TO 24V START-UP VOLTAGE

OPERATES THROUGH TRANSIENTS DOWN TO 2.5V

0.1μF

100pF

220μF

TG1

BOOST1

SW1

BG1

FREQ

SS SGND

SENSE1+

SENSE1–

VFB

ITH

VBIAS

LTC3787

INTVCC

PLLIN/MODE

TG2

BOOST2

SW2

BG2

SENSE2+

SENSE2–

PGND

0.1μF

4.7μF

232k

3787 TA01a

47μF

3.3μH

4mΩ

12V to 24V/10A 2-Phase Synchronous Boost Converter

OUTPUT CURRENT (A)

40

50

60

70

80

3787 TA01b

30

20

10

0

90

100

10

100

1000

1

0.1

10000

0.01

0.1

1

10

BURST EFFICIENCY

BURST LOSS

VIN = 12V

VOUT = 24V

Burst Mode OPERATION

FIGURE 10 CIRCUIT

0.0001 0.001

0.00001

Efficiency and Power Loss

vs Output Current

Аналогичный номер детали - LT3757

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Аналогичное описание - LT3757

производитель	номер детали	датащи	подробное описание детали
Linear Technology	LTC1629-6	300Kb / 28P	PolyPhase, Synchronous
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Feeling Technology Corp...	FP5202	342Kb / 10P	Non-Synchronous PWM Boost Controller
Shenzhen Huazhimei Semi...	HM5307	954Kb / 15P	Non-Synchronous PWM Boost Controller
Shenzhen Huazhimei Semi...	HM5174	968Kb / 12P	SYNCHRONOUS BOOST CONTROLLER
Analog Devices	LTC7841	1Mb / 48P	PolyPhase Synchronous Boost Controller with PMBus Interface

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