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參數(shù)資料
| 型號： | MAX649MJA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5V/3.3V/3V or Adjustable, High-Efficiency, |
| 中文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, CDIP8 |
| 封裝： | 0.300 INCH, CERDIP-8 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 266K |
| 代理商： | MAX649MJA |
M
5V /3.3V /3V or Adjustable, High-Effic ienc y,
Low I
Q
, S tep-Down DC-DC Controllers
6
_______________________________________________________________________________________
MAX649
LINE-TRANSIENT RESPONSE
250
μ
s/div
A
B
I
= 1A
A: INPUT VOLTAGE (7V & 12V), 5V/div
B: 5V OUT, AC COUPLED, 100mV/div
_____________________________Typic al Operating Charac teristic s (c ontinued)
MAX649
LOAD-TRANSIENT RESPONSE
250
μ
s/div
A
B
A: LOAD CURRENT (100mA & 1A), 500mA/div
B: 5V OUTPUT VOLTAGE, AC COUPLED, 50mV/div
______________________________________________________________Pin Desc ription
Positive power-supply input
Current-sense input. Connect current-sense resistor between V+ and CS. When the voltage across the
resistor equals the current-limit trip level, the external MOSFET is turned off.
V+
5
CS
6
Gate drive for external P-channel MOSFET. EXT swings between V+ and GND.
Ground
EXT
GND
7
8
1.5V reference output that can source 100μA. Bypass with 0.1μF.
REF
4
SHDN
3
PIN
FB
2
OUT
1
FUNCTION
NAME
Sense input for fixed 5V, 3.3V, or 3V output operation. OUT is internally connected to the on-chip voltage divider.
Although it is connected to the output of the circuit, the OUT pin does not supply current.
Feedback input. Connect to GND for fixed-output operation. Connect a resistor divider between OUT, FB,
and GND for adjustable-output operation. See Setting the Output Voltage section.
Active-high TTL/CMOS logic-level input. Part is placed in shutdown when SHDN is driven high. In shutdown mode,
the reference and the external MOSFET are turned off, and OUT = 0V. Connect to GND for normal operation.
MAX649
SHUTDOWN RESPONSE TIME
1ms/div
A
B
I
= 1A
A: SHDN INPUT VOLTAGE (0V & 5V), 2V/div
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