參數(shù)資料
型號: MAX1549ETL+
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 穩(wěn)壓器
英文描述: Dual, Interleaved, Fixed-Frequency Step-Down Controller with a Dynamically Adjustable Output
中文描述: DUAL SWITCHING CONTROLLER, 450 kHz SWITCHING FREQ-MAX, PQCC40
封裝: 6 X 6 MM, 0.8 MM HEIGHT, MO220WJJD-2, QFN-40
文件頁數(shù): 35/35頁
文件大?。?/td> 504K
代理商: MAX1549ETL+
MAX1549
Dual, Interleaved, Fixed-Frequency Step-Down
Controller with a Dynamically Adjustable Output
_______________________________________________________________________________________
9
SWITCHING FREQUENCY DISTRIBUTION
(300kHz OPERATION)
MAX1549
toc13
SWITCHING FREQUENCY (kHz)
SAMPLE
PERCENTAGE
(%)
305
300
295
10
20
30
40
50
0
290
310
SAMPLE SIZE = 150
STARTUP WAVEFORM
(HEAVY LOAD)
MAX1549 toc14
5V
0
5A
2.5V
B
D
C
A
400
s/div
0
A: ON2, 5V/div
B: 2.5V OUTPUT, 2V/div
0.5
LOAD
C: INDUCTOR CURRENT, 5A/div
D: PGOOD2, 5V/div
STARTUP WAVEFORM
(LIGHT LOAD)
MAX1549 toc15
5V
0
2A
2.5V
B
D
C
A
200
s/div
0
A: ON2, 5V/div
B: 2.5V OUTPUT, 2V/div
100
LOAD
C: INDUCTOR CURRENT, 2A/div
D: PGOOD2, 5V/div
SHUTDOWN WAVEFORM
(1
LOAD)
MAX1549 toc16
5V
0
5V
2.5V
B
D
C
A
100
s/div
0
A: ON2, 5V/div
B: OUT2, 2V/div
C: DL2, 5V/div
D: INDUCTOR CURRENT, 5A/div
E: PGOOD2, 5V/div
5V
E
0
SHUTDOWN WAVEFORM
(100
LOAD)
MAX1549 toc17
5V
0
5V
2.5V
B
D
C
A
1ms/div
0
A: ON2, 5V/div
B: OUT2, 2V/div
C: DL2, 5V/div
D: INDUCTOR CURRENT, 2A/div
E: PGOOD2, 5V/div
5V
E
0
INTERLEAVED OPERATION
MAX1549 toc18
12V
0
1.0V
B
D
C
A
2
s/div
0
12V
A: LX1, 10V/div
B: 1.0V OUTPUT, 50mV/div
C: LX2, 10V/div
D: 2.5V OUTPUT, 50mV/div
2.5V
Typical Operating Characteristics (continued)
(MAX1549 circuit of Figure 1, VIN = 12V, VDD = VCC = 5V, SKIP = GND, FSEL = open, TA = +25°C, unless otherwise noted.)
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