MAX750ACSA | |
|---|---|
| Manufacturer Part Number | MAX750ACSA |
| Description | IC REG PWM STEP-DWN ADJ 8-SOIC |
| Manufacturer | Maxim Integrated Products |
| Type | Step-Down (Buck), PWM - Current Mode |
| MAX750ACSA datasheets |
|
Availability: In stock
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Warranty: 60 days
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Specifications of MAX750ACSA | |||
|---|---|---|---|
| Internal Switch(s) | Yes | Synchronous Rectifier | No |
| Number Of Outputs | 1 | Voltage - Output | 1.25 ~ 11 V |
| Current - Output | 450mA | Frequency - Switching | 170kHz |
| Voltage - Input | 4 ~ 11 V | Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Package / Case | 8-SOIC (3.9mm Width) |
| Voltage - Supply | 4 V ~ 11 V | Frequency-max | 210kHz |
| Duty Cycle | 92% | Pwm Type | Current Mode |
| Buck | Yes | Boost | No |
| Flyback | No | Inverting | No |
| Doubler | No | Divider | No |
| Cuk | No | Isolated | No |
| Lead Free Status / RoHS Status | Contains lead / RoHS non-compliant | ||
PrevNext
Adjustable, Step-Down,
Current-Mode PWM Regulators
Table 1. Typical Soft-Start Times
MAX750A CIRCUIT CONDITIONS
R1 (kΩ)
V+ (V)
I
(mA)
OUT
510
6
0
510
9
0
510
11
0
510
9
150
510
9
300
510
9
150
510
9
150
None
6
0
None
9
0
None
11
0
None
9
150
None
9
150
None
9
150
MAX750A CIRCUIT CONDITIONS
R1 (kΩ)
V+ (V)
I
(mA)
OUT
510
7
0
510
12
0
510
16
0
510
12
300
510
12
750
None
7
0
None
12
0
None
16
0
None
12
300
as the temperature falls, and excessive ESR is the most
likely cause of trouble at temperatures below 0°C.
Sanyo OS-CON series through-hole and surface-mount
tantalum capacitors exhibit low ESR at temperatures
below 0°C. Refer to Table 2 for recommended capaci-
tor values and suggested capacitor suppliers.
Other Components
The catch diode should be a Schottky or high-speed
silicon rectifier with a peak current rating of about 1A
for full-load (750mA) operation. The 1N5817 is a good
choice. The 330pF outer-loop compensation capacitor
10
______________________________________________________________________________________
SOFT-START TIME (ms) vs. C1 (µF)
C4 (µF)
C1 = 0.01
C1 = 0.047
100
2
6
100
1
4
100
1
2
100
1
4
100
1
5
390
3
6
680
4
6
100
16
34
100
10
22
100
8
18
100
34
134
390
39
147
680
40
152
SOFT-START TIME (ms) vs. C1 (µF)
C4 (µF)
C1 = 0.01
C1 = 0.047
100
1
4
100
1
2
100
1
1
100
1
3
100
1
5
100
12
27
100
7
16
100
6
13
100
27
112
provides the widest input voltage range and best tran-
sient characteristics. For low-current applications, the
510kΩ resistor may be omitted (see the Maximum
Output Current vs. Supply Voltage, R1 Removed graph
in the Typical Operating Characteristics ).
A good layout is essential for clean, stable operation.
The layouts and component placement diagrams given
in Figures 4-7 have been successfully tested over a
wide range of operating conditions. The 1µF bypass
capacitor (C2) must be positioned as close to the V+
C1 = 0.1
C1 = 0.47
11
28
6
15
4
11
8
21
9
27
9
23
9
24
51
125
34
82
28
66
270
1263
280
1275
285
1280
C1 = 0.1
C1 = 0.47
6
18
3
8
2
6
5
3
8
21
40
100
25
54
20
68
215
1114
Printed Circuit Layouts
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