HT7727A(2007) 查看數據表（PDF） - Holtek Semiconductor

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HT7727A
(Rev.:2007)

PFM Step-up DC/DC Converter

Holtek Semiconductor 

HT77XXA

Pin Assignment

T O -9 2

S O T -8 9

H T77X X A

123

F r o n t V ie w

H T77X X A #

S O T -2 3

VO UT

3

T o p V ie w

77X X A #

S O T -2 5

LX

GND

5

4

T o p V ie w

77X X A #

T o p V ie w

G N D V O U T LX

1

2

3

G N D V O U T LX

1

2

GND

LX

1

2

3

CE VO UT NC

B o tto m V ie w

G N D V O U T LX

GND

LX

CE VO UT NC

Pin Description

TO-92

Pin No.

SOT-89

SOT-23

¾

¾

¾

2

2

3

¾

¾

¾

1

1

1

3

3

2

SOT-25

1

2

3

4

5

Pin Name

Description

CE

VOUT

NC

GND

LX

Chip enable pin, high active

DC/DC converter output monitoring pin

No connection

Ground pin

Switching pin

Absolute Maximum Ratings

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

Operating Temperature ...........................-40°C to 85°C

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

Thermal Information

Symbol

Parameter

Thermal Resistance

qJA

(Junction to Ambient)

(Assume no ambient airflow,

no heat sink)

PD Power Dissipation

Note: PD is measured at Ta= 25°C

Package

SOT-89

TO-92

SOT-23

SOT-25

SOT-89

TO-92

SOT-23

SOT-25

Max.

300

300

330

320

0.33

0.33

0.3

0.31

Unit

°C/W

°C/W

°C/W

°C/W

W

W

W

W

Rev 1.10

2

September 26, 2007

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