LTC1514 查看數據表（PDF） - Linear Technology

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LTC1514

Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator

Linear Technology 

LTC1514-3.3/LTC1514-5

APPLICATIONS INFORMATION

resistor divider (see Figure 2). Since the low-battery

comparator is kept alive in shutdown, it may be used to

protect batteries against deep discharge by shutting

down the power supply when the battery voltage gets too

low. The open-drain comparator output allows for flex-

ible interfacing between the LBO output and external

logic. LBO pull-up resistors in the 50k to 1M range are

recommended.

TYPICAL APPLICATIONS N

3.3V Step-Up/Step-Down Supply with Power Good Output

ON OFF

POWER GOOD

806k

1%

100k LTC1514-3.3

1

8

SHDN VOUT

3V VTRIP

2

LBO

3

LBI

7

VIN

C1+ 6

499k

1%

4

GND

C1– 5

+

0.22µF

10µF+

VOUT = 3.3V ± 4%

IOUT = 15mA, VIN > 2V

VIN

IOUT = 50mA, VIN > 3V

2V TO 8V

10µF

1514 TA05

Low Power Battery Backup Supply with Autoswitchover and No Reverse Current

MAIN

5V SUPPLY

499k

TP0610T

LTC1514-5

1

8

SHDN VOUT

1.5M

1%

2

LBO

4.6V VTRIP 3

LBI

7

VIN

C1+ 6

499k

499k

4

GND

C1– 5

1%

BACKED-UP

CIRCUITRY

5V BACKUP SUPPLY

IOUT = 15mA

BAT54

+

0.1µF

10µF

+

10µF

TRICKLE CHARGE

AND LTC1514 IDD

3-CELL

NiCd BATTERY

1514 TA03

6V

WALL

ADAPTER

INPUT

Battery/External Power Autoswitch Regulator

MBR0520L

1M

1%

499k

1%

ON OFF

LTC1514-5

1

SHDN

2

LBO

3

LBI

4

GND

8

VOUT

7

VIN

C1+ 6

C1– 5

499k

0.22µF CHARGE PATH

+

10µF

EXTERNAL

POWER GOOD

+

5V

22µF

3-CELL

NiCd

BATTERY

1514 TA06

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

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