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

The * denotes specifications which apply over the 0°C to 70°C operating temperature range.

PIN FUNCTIONS

PIN No.

SYMBOL

1

LBI

2

LBO

3

VIN

4

SW

5

GND

6

ILIM

7

SHDN

8

FB/SENSE

DESCRIPTION

Low Battery Detector Input. When voltage on this pin is less than

1.17V,detector output is low

Low Battery Detector Output. Open collector can sink up to 500µA.Low

battery detector remains active when device is shut down.

Input Supply. Must be bypassed close (<0.2”) to the pin. See required layout

in the Typical Applications

Collector of Power NPN. Keep copper traces on this pin short and direct to

minimize RFI

Device Ground. Must be low impedance; solder directly to ground plane

Current Limit Set Pin. Float for 1A peak switch current; a resistor to ground

will lower peak current

Shutdown Input. When low, switching regulator is turned off. The

low-battery detector remains active. The SHDN input should not be left

floating. If SHDN is not used, tie the pin to VIN

On the UT2306 (adjustable) this pin goes to the comparator input. On the

fixed-output versions, the pin connects to the resistor divider which sets output

voltage. The divider is disconnected from the pin during shutdown.

TYPICAL APPLICATION

2-Cell to 5V Step-Up Converter with Low-Battery Detect

22μH

D1

1N5817

499K

3

4

+

2 CELLS

100μF

1 VIN

SW 8

LBI SENSE

604K

NC

6

UT2306-5.0

ILIM

IBO 2

SHDN GND

7

5

SHUTDOWN

100K

5V

200mA

+

100μF

LBO

LOW WHEN

VBAT＜2.2V

Efficiency

90

80

70

60

50

40

0.01

V IN =3.3V

V IN =2.5V

V IN =1.8V

1

10

100 500

LOAD CURRENT(mA)

UTC UNISONIC TECHNOLOGIES CO., LTD. 3

QW-R103-029,A

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