參數(shù)資料
型號: MAX777LEPA
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 穩(wěn)壓器
英文描述: Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters
中文描述: 1 A SWITCHING REGULATOR, 150 kHz SWITCHING FREQ-MAX, PDIP8
封裝: 0.300 INCH, PLASTIC, DIP-8
文件頁數(shù): 6/12頁
文件大小: 117K
代理商: MAX777LEPA
M
Low-Voltage Input, 3V /3.3V /5V /
Adjustable Output, S tep-Up DC-DC Converters
6
_______________________________________________________________________________________
A: SHDN, 2V/div
B: V
OUT
, 1V/div
V
OUT
= 3V
MAX778L
START-UP TIME
A
B
10ms/div
_____________________________Typic al Operating Charac teristic s (c ontinued)
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
NAME
FUNCTION
1
ILIM
Sets switch current-limit input. Connect to IN for 1A current limit. A resistor from ILIM to IN sets lower
peak inductor currents.
2
IN
Input from battery
3
AGND
Analog ground. Not internally connected to PGND.
PIN
4
PGND
Power ground. Must be low impedance; solder directly to ground plane or star ground. Connect to
AGND, close to the device.
5
LX
Collector of 1A NPN power switch and emitter of Active Rectifier PNP.
6
OUT
Voltage output. Connect filter capacitor close to pin.
7
SHDN
Shutdown input disables power supply when low. Also disconnects load from input. Threshold is set at
V
IN
/2.
8
N.C.
(MAX777L)
No connect—not internally connected.
SEL
(MAX778L)
Selects the main output voltage. 3.3V when hard-wired to AGND, 3.0V when left open.
______________________________________________________________Pin Desc ription
FB
(MAX779L)
Feedback input for adjustable-output operation. Connect to an external voltage divider between V
OUT
and AGND.
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