UT2306-3.3V データシートの表示（PDF） - Unisonic Technologies

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UT2306-3.3V

MICROPOWER DC/DC CONVERTERS WITH LOW-BATTERY DETECTOR ACTIVE IN SHUTDOWN

Unisonic Technologies 

UTC UT2306/UT2306-3.3V/UT2306-5.0V

LINEAR INTEGRATED CIRCUIT

V OUT

2V/DIV

I IN

500mA/DIV

V SHDN

10V/DIV

1ms/DIV

Figure 3. Start-Up Response.Input Current Rises Quickly to

1A. VOUT Reaches 5V in Approximately 1ms.Output Drives

20mA Load

22μH *

MBRS130L

+

100μ F

2 CELLS

V IN

SW

LBI

SENSE

UT2306-5.0

IBO

GND

SHDN

ILIM R1

1M

+ C1

1μF SHUTDOWN

*SUMIDA CD54-220

Figure4.2-Cell to 5V/200mA Boost Converter Takes Four

External Parts.Components with Dashed Lines Are for

Soft Start(Optional)

5V

200mA

+

100 μF

If the full power capability of the UT2306 is not required,peak switch current can be limited by connecting a resistor

RLIM from the ILIM pin to ground. With RLIM = 22k, peak switch current is reduced to approximately 500mA. Smaller

power components can then be used. The graph in Figure 6 shows switch current vs RLIM resistor value.

UTC UNISONIC TECHNOLOGIES CO., LTD. 8

QW-R103-029,A

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