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參數(shù)資料
| 型號： | ML4903 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Current Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的大電流同步補償控制器（12V到1.8V～3.5V變換）) |
| 中文描述： | 高電流同步降壓控制器，用于直流/直流轉(zhuǎn)換（用于直流/直流變換的大電流同步補償控制器（12V的到1.8?3.5V的變換）） |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 275K |
| 代理商： | ML4903 |
ML4903
3
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which
the device could be permanently damaged. Absolute
maximum ratings are stress ratings only and functional
device operation is not implied.
V
DD...........................................................................................
13.5V
V
CC..................................................................................................
7V
Peak Driver Output Current .......................................±2A
V
FB
Voltage...................................... GND - 0.3V to 5.5V
I
SENSE
Voltage.................................. GND - 0.5V to 5.5V
All Other Inputs .................... GND - 0.3V to V
DD
+ 0.3V
SHDN
Input Current .............................................. 100
m
A
Junction Temperature..............................................150°C
Storage Temperature Range ..................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .....................260°C
Thermal Resistance (
q
JA
).................................... 100°C/W
OPERATING CONDITIONS
Temperature Range ....................................... 0°C to 70°C
V
DD
Range ..............................................11.4V to 12.6V
V
CC
Range ...............................................4.75V to 5.25V
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, V
DD
= 12V, V
CC
=
SHDN
= 5V, T
A
= Operating Temperature Range (Note 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
REFERENCE
V
REF
Output Voltage
3.51
3.535
3.56
V
Line Regulation
11V < V
DD
< 13V
0.5
mV/V
UV LOCKOUT
V
DD
Start-up Threshold
10.0
10.5
10.8
V
V
DD
Hysteresis
300
450
600
mV
V
CC
Start-up Threshold
4.25
4.4
4.6
V
V
CC
Hysteresis
300
400
500
mV
SHUTDOWN
Input Low Voltage
0.8
V
Input High Voltage
2.0
V
Delay to Output
50
ns
POWER GOOD COMPARATOR
Output Voltage in Regulation
5k
W
pull-up to 5V
4.8
V
Output Voltage out of Regulation
V
FB
< 90% V
DAC
or >110% V
DAC
SHDN
= 0V, 5k
W
pull-up to 5V
0.4
V
Output Voltage in Shutdown
0.4
V
BUCK REGULATOR
Oscillator Frequency
160
200
230
kHz
Duty Cycle Ratio
RANGE = 1, V
FB
= 0V,
DAC (D3-D0) Code = 0100
80
98
%
RANGE = 1, V
FB
> 3.193V,
DAC (D3-D0) Code = 0100
0
%
DAC (RANGE, D3-D0) Input Low Voltage
0.8
V
DAC (RANGE, D3-D0) Input High Voltage
2.0
V
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