TK73211M Ver la hoja de datos (PDF) - Toko America Inc

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TK73211M

LOW DROPOUT REGULATOR

Toko America Inc  

TK732xx

APPLICATION INFORMATION (CONT.)

EXTERNAL PNP POWER TRANSISTOR

This IC can use any kind of external transistor. The external transistor selection is a function of the load current, Hfe and

power dissipation. See following chart:

LOAD CURRENT

RECOMMENDED EXTERNAL TRANSISTOR

0 ~ 180 mA

2SB624, 2SB1115, 2SB799 (NEC), 2SB970 (Matushita)

0 ~ 300 mA

2SB1115, 2SB799 (NEC)

0 ~ 500 mA

2SB1114, 2SB1115 (NEC), 2SB1302 (Sanyo), 2SA1203,

2SA1213, 2SA1734 (Toshiba)

0~1A

2SA1242, 2SA1736 (Toshiba), 2SB1302, 2SA1896 (Sanyo)

0~2A

2SA1451, 2SA1242 (Toshiba)

0~3A

2SA1451 (Toshiba), 2SA1645 (NEC)

0~4A

2SA1451 (Toshiba), 2SB904 (Sanyo), 2SA1645 (NEC)

RECOMMENDED RIPK (Ω)

0.33 ~ 0.39

0.22 ~ 0.27

0.12 ~ 0.15

0.056 ~ 0.068

0.033 ~ 0.039

0.022 ~ 0.027

0.012 ~ 0.015

HIGH-SIDE SWITCHING

VOLTAGE

REGULATOR

VDROP

ON/OFF

CONTROL

VOUT

High-side switching should not be implemented by an external transistor as shown above. This results in additional

voltage drop and loss of accuracy.

µ PRO

VIN

TK732xx

VCONT

VOUT

The high output voltage accuracy and low dropout voltage are maintained when the IC is turned ON/OFF by using the

control pin as illustrated above.

January 1999 TOKO, Inc.

Page 13

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