10

LT1931/LT1931A

1931fa

TYPICAL APPLICATIO S

5V

–5V

200mA

1931 TA06a

SW

L1

3.3

µH

L2

3.3

µH

D1

GND

LT1931A

C1: TAIYO YUDEN X5R JMK212BJ225MG

C2: TAIYO YUDEN X5R LMK212BJ105MG

C3: TAIYO YUDEN X5R JMK212BJ475MG

D1: ON SEMICONDUCTOR MBR0520

L1, L2: PANASONIC ELJPC3R3MF

C1

2.2

µF

C3

4.7

µF

C2

1

µF

R2

10k

R1

28.7k

C4

68pF

NFB

SHDN

LOAD CURRENT (mA)

0

50

55

60

65

70

75

80

50

100

150

200

1931 TA06b

250

2.2MHz, 5V to –5V Converter Uses Tiny Chip Inductors

Efficiency

12V

SW

L1

22

µH

GND

R2

1k

LT1931

NFB

SHDN

15k

R3

25.5k

R1

1

Ω

R4

2.7k

C6

1000pF

68nF

C1

4.7

µF

16V

C3

1

µF

35V

*TOTAL OUTPUT POWER NOT TO EXCEED 3.3W

C1 TO C5: X5R OR X7R

D1, D2: BAV99 OR EQUIVALENT

L1: SUMIDA CR43-220

C5

4.7

µF

35V

32

D2

1

1931 TA08

C4

4.7

µF

35V

–33V

100mA*

COM

–66V

48mA*

C2

1

µF

35V

32

D1

1

SLIC Power Supply with – 33V and – 68V Outputs, Uses Soft-Start