HT77XX(2006) 查看數據表（PDF） - Holtek Semiconductor

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HT77XX
(Rev.:2006)

PFM Step-up DC/DC Converter

Holtek Semiconductor 

Block Diagram

LX

B u ffe r

P F M C o n tro l

O S C 115kH z

C h ip E n a b le

Pin Assignment

T O -9 2

CE

S O T -8 9

H T77X X

123

F r o n t V ie w

G N D V O U T LX

H T77X X

1

2

3

G N D V O U T LX

VO UT

V re f

HT77XX

GND

S O T -2 5

LX

GND

5

4

77X X

T o p V ie w

1

2

3

CE VO UT NC

B o tto m V ie w

G N D V O U T LX

CE VO UT NC

Pin Description

Pin No.

Pin Name

TO-92 SOT-25 SOT-89

Description

¾

1

¾

CE Chip enable pin, high active

2

2

2

VOUT DC/DC converter output monitoring pin

¾

3

¾

NC No connection

1

4

1

GND Ground pin

3

5

3

LX Switching pin

Absolute Maximum Ratings

Supply Voltage ..............................VSS-0.3V to VSS+7V

Power Consumption (*1) .................................. 500mW

Power Consumption (*2) .................................. 250mW

Storage Temperature ............................-50°C to 125°C

Operating Temperature...............................0°C to 70°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those

listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-

ity.

*1: applied to SOT-89 and TO-92

*2: applied to SOT-25

Rev 1.10

2

March 7, 2006

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