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參數(shù)資料
| 型號(hào)： | 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(zhuǎn)換器 |
| 文件頁數(shù)： | 3/19頁 |
| 文件大?。?/td> | 502K |
| 代理商： | HT77XX |
Electrical Characteristics
V
IN
=V
OUT
0.6; I
OUT
=10mA; Ta=25 C (Unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
IN
Input Voltage
6
V
V
OUT
Output Voltage Tolerance
2.5
2.5
%
V
START
Start-up Voltage (Fig. 1)
V
IN
: 0
2V; I
OUT
=1mA
0.7
0.9
V
V
HOLD
MinimumHold-onVoltage(Fig.1) V
IN
: 2
0V; I
OUT
=1mA
0.7
V
I
IN
No-load Input Current (Fig. 1)
I
OUT
=0mA
10
20
A
I
DD1
Supply Current 1 (Fig. 2)
V
S
=V
OUT
0.95
Measured at V
OUT
pin
V
OUT
=1.8V
35
50
A
V
OUT
=2.7V
40
60
V
OUT
=3.0V
45
68
V
OUT
=3.3V
55
81
V
OUT
=3.7V
64
85
V
OUT
=5.0V
85
134
I
DD2
Supply Current 2 (Fig. 2)
V
S
=V
OUT
+0.5V
Measured at V
OUT
pin
4
7
A
I
SHDN
Shutdown Current
CE=GND
0.5
1
A
V
IH
CE High Threshold
2
V
V
IL
CE Low Threshold
0.4
V
I
LEAK
LX Leakage Current (Fig. 3)
V
S
=V
OUT
+0.5V, V
X
=6V
Measured at the LX pin
0.9
A
f
OSC
Maximum Oscillator Frequency
(Fig. 3)
V
S
=V
OUT
0.95
Measured at LX pin
115
kHz
D
OSC
Oscillator Duty Cycle (Fig. 3)
V
S
=V
OUT
0.95
Measured at LX pin
65
75
85
%
Efficiency
V
OUT
1.8V
80
%
V
OUT
2.7V
85
Note:
Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings
indicate conditions for which the device is intended to be functional, but do not guarantee specific performance
limits. The guaranteed specifications apply only for the test conditions listed.
Test Circuit
HT77XX
Rev 1.60
3
September 12, 2007
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