LT1931 datasheet(8/12 Pages) LINER | 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT

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LT1931 数据表(PDF) 8 Page - Linear Technology

部件名	LT1931

功能描述	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT

Download	12 Pages

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制造商	LINER [Linear Technology]

网页	http://www.linear.com

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LT1931/LT1931A

1931fa

increased to 68nF, resulting in a lower peak input current

of 350mA with a VOUT ramp time of 1.6ms. CSS or RSS can

be increased further for an even slower ramp, if desired.

Diode D2 serves to quickly discharge CSS when VSS is

driven low to shut down the device. D2 can be omitted,

resulting in a “soft-stop” slow discharge of the output

capacitor.

L1B

L1A

SHUTDOWN

1931 F10

–VOUT

GND

VIN

VOUT

2V/DIV

IIN

0.5A/DIV

AC COUPLED

VSS

200

µs/DIV

1931 F08

Figure 8. RSS = 15k, CSS = 33nF; VOUT Reaches – 5V in 1ms;

Input Current Peaks at 500mA

VOUT

2V/DIV

IIN

0.5A/DIV

AC COUPLED

VSS

500

µs/DIV

1931 F09

Figure 9. RSS = 15k, CSS = 68nF; VOUT Reaches – 5V in 1.6ms;

Input Current Peaks at 350mA

Figure 10. Suggested Component Placement.

Note Cut in Ground Copper at D1’s Cathode

APPLICATIO S I FOR ATIO

DIODE SELECTION

A Schottky diode is recommended for use with the LT1931/

LT1931A. The Motorola MBR0520 is a very good choice.

Where the input to output voltage differential exceeds 20V,

use the MBR0530 (a 30V diode). These diodes are rated to

handle an average forward current of 0.5 A. In applications

where the average forward current of the diode exceeds

0.5A, a Microsemi UPS5817 rated at 1A is recommended.

LAYOUT HINTS

The high-speed operation of the LT1931/LT1931A de-

mands careful attention to board layout. You will not get

advertised performance with careless layout. Figure 10

shows the recommended component placement. The

ground cut at the cathode of D1 is essential for low noise

operation.

类似零件编号 - LT1931

制造商	部件名	数据表	功能描述
Linear Technology	LT1931	212Kb / 12P	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
	LT1931	274Kb / 28P	Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization
	LT1931	477Kb / 36P	Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller
	LT1931	454Kb / 12P	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
	LT1931	193Kb / 12P	Low Dropout Negative Micropower Regulator in ThinSOT

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类似说明 - LT1931

制造商	部件名	数据表	功能描述
Linear Technology	LT1931	212Kb / 12P	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
	LT1931	454Kb / 12P	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
	LT1931A	454Kb / 12P	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
	LT1930A	202Kb / 12P	1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters in ThinSOT
	LT1930	202Kb / 12P	1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters in ThinSOT
	LT3462	233Kb / 8P	Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT
	LT3462A	233Kb / 8P	Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT
	LT3462	225Kb / 8P	Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT
	LT1930	190Kb / 12P	1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters
	LTC3527	2Mb / 20P	Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

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