Block Diagram

Pin Assignment

Pin Description

Pin No.

Pin Name

Description

TO-92

SOT-25

SOT-89

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

Storage Temperature ............................

-50°Cto125°C

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

Operating Temperature...............................0

°Cto70°C

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

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

HT77XX

Rev 1.10

2

March 7, 2006

G N D

S O T - 8 9

F r o n t V i e w

B o t t o m V i e w

S O T - 2 5

C E

V O U T

G N D

V O U T

T o p V i e w

H T 7 7 X X

7 7 X X

T O - 9 2

V O U T

G N D

H T 7 7 X X

L X

V O U T

L X

L X

L X

G N D

N C

C E

V O U T

N C

1

2

3

1

2

3

1

2

3

4

5

V O U T

G N D

V r e f

P F M C o n t r o l

O S C 1 1 5 k H z

B u f f e r

L X

C h i p E n a b l e

C E