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參數資料
| 型號： | HT77XX |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | PFM Step-up DC/DC Converter |
| 中文描述： | PFM步升直流/直流轉換器 |
| 文件頁數： | 2/19頁 |
| 文件大小： | 502K |
| 代理商： | HT77XX |
Pin Assignment
Pin Description
Pin No.
Pin Name
Description
TO-92
SOT-89
SOT-23
SOT-25
1
CE
Chip enable pin, high active
2
2
3
2
VOUT
DC/DC converter output monitoring pin
3
NC
No connection
1
1
1
4
GND
Ground pin
3
3
2
5
LX
Switching pin
Absolute Maximum Ratings
Supply Voltage..............................V
SS
0.3V to V
SS
+7V
Storage Temperature............................ 50 C to 125 C
Operating Temperature........................... 40 C to 85 C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings 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
Package
Max.
Unit
JA
Thermal Resistance
(Junction to Ambient)
(Assume no ambient airflow,
no heat sink)
SOT-89
300
C/W
TO-92
300
C/W
SOT-23
330
C/W
SOT-25
320
C/W
P
D
Power Dissipation
SOT-89
0.33
W
TO-92
0.33
W
SOT-23
0.3
W
SOT-25
0.31
W
Note: P
D
is measured at Ta= 25 C
HT77XX
Rev 1.60
2
September 12, 2007
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