LTR1619 datasheet, PDF - EEWORLD Datasheet

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LTR1619: DescriptionWide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller; File Size517KB，36 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTR1619 Overview

Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller

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FEATURES

LTC1871

Wide Input Range, No R

SENSE

™

Current Mode Boost,

Flyback and SEPIC Controller

DESCRIPTION

The LTC

1871 is a wide input range, current mode, boost,

ﬂyback or SEPIC controller that drives an N-channel power

MOSFET and requires very few external components. In-

tended for low to medium power applications, it eliminates

the need for a current sense resistor by utilizing the power

MOSFET’s on-resistance, thereby maximizing efﬁciency.

The IC’s operating frequency can be set with an external

resistor over a 50kHz to 1MHz range, and can be syn-

chronized to an external clock using the MODE/SYNC

pin. Burst Mode operation at light loads, a low minimum

operating supply voltage of 2.5V and a low shutdown

quiescent current of 10μA make the LTC1871 ideally suited

for battery-operated systems.

For applications requiring constant frequency opera-

tion, Burst Mode operation can be defeated using the

MODE/SYNC pin. Higher output voltage boost, SEPIC

and ﬂyback applications are possible with the LTC1871

by connecting the SENSE pin to a resistor in the source

of the power MOSFET.

The LTC1871 is available in the 10-lead MSOP package.

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

No R

SENSE

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

property of their respective owners.

High Efﬁciency (No Sense Resistor Required)

Wide Input Voltage Range: 2.5V to 36V

Current Mode Control Provides Excellent

Transient Response

High Maximum Duty Cycle (92% Typ)

±2% RUN Pin Threshold with 100mV Hysteresis

±1% Internal Voltage Reference

Micropower Shutdown: I

= 10μA

Programmable Operating Frequency

(50kHz to 1MHz) with One External Resistor

Synchronizable to an External Clock Up to 1.3 × f

OSC

User-Controlled Pulse Skip or Burst Mode

Operation

Internal 5.2V Low Dropout Voltage Regulator

Output Overvoltage Protection

Capable of Operating with a Sense Resistor for

High Output Voltage Applications

Small 10-Lead MSOP Package

APPLICATIONS

Telecom Power Supplies

Portable Electronic Equipment

TYPICAL APPLICATION

3.3V

1μH

RUN

22k

6.8nF

47pF

37.4k

12.1k

FREQ

80.6k

MODE/SYNC

LTC1871

INTV

GATE

GND

VCC

4.7μF

X5R

SENSE

OUT

(10A PEAK)

OUT2

22μF

6.3V

X5R

×2

GND

100

EFFICIENCY (%)

0.001

Burst Mode

OPERATION

Efﬁciency of Figure 1

OUT1

150μF

6.3V

×4

PULSE-SKIP

MODE

22μF

6.3V

×2

1871 F01a

TAIYO YUDEN JMK325BJ226MM

OUT1

: PANASONIC EEFUEOJ151R

OUT2

: TAIYO YUDEN JMK325BJ226MM

D1: MBRB2515L

L1: SUMIDA CEP125-H 1R0MH

M1: FAIRCHILD FDS7760A

0.1

0.01

OUTPUT CURRENT (A)

1871 F01b

Figure 1. High Efﬁciency 3.3V Input, 5V Output Boost Converter (Bootstrapped)

1871fe

LTR1619 Related Products

	LTR1619	LTC1871IMS-7
Description	Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller	Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller

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