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參數(shù)資料
| 型號： | MAX738A |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 5V, Step-Down, Current-Mode PWM DC-DC Converters |
| 中文描述： | 5V、降壓型、電流模式PWM DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 229K |
| 代理商： | MAX738A |
Internal Referenc e
The +1.23V bandgap reference supplies up to 100μA
at REF. Connect a 0.01μF bypass capacitor from REF
to GND.
Osc illator
The internal oscillator of the MAX730A typically oper-
ates at 170kHz (160kHz for the MAX738A and 185kHz
for the MAX744A). The MAX744A is guaranteed to
operate at a minimum of 159kHz and a maximum of
212.5kHz over the operating voltage and temperature
range, making it ideal for use in portable communica-
tions systems. The Typical Operating Characteristics
graphs indicate oscillator frequency stability over tem-
perature and supply voltage.
____________Applic ations Information
Figure 3 shows the standard 5V step-down application
circuits. Table 3 lists the components for the desired
operating temperature range. These circuits are useful
in systems that require high current at high efficiency
and are powered by an unregulated supply, such as a
battery or wall-plug AC-DC transformer. These circuits
operate over the entire line, load, and temperature
ranges using the single set of component values shown
in Figure 3 and listed in Table 3.
Induc tor S elec tion
The MAX730A/MAX738A/MAX744A require no inductor
design because they are tested in-circuit, and are
guaranteed to deliver the power specified in the
Electrical Characteristics with high efficiency using a
M
5V, S tep-Down,
Current-Mode PWM DC-DC Converters
_______________________________________________________________________________________
9
Table 1. Typical Soft-Start Times
MAX730A CIRCUIT CONDITIONS
V+ (V)
6
9
11
9
9
9
9
6
9
11
9
9
9
SOFT-START TIME (ms) vs. C1 (μF)
C1 = 0.047
6
4
2
4
5
6
6
34
22
18
134
147
152
R1 (k
)
510
510
510
510
510
510
510
None
None
None
None
None
None
I
OUT
(mA)
0
0
0
150
300
150
150
0
0
0
150
150
150
C4 (μF)
100
100
100
100
100
390
680
100
100
100
100
390
680
C1 = 0.01
2
1
1
1
1
3
4
16
10
8
34
39
40
C1 = 0.1
11
6
4
8
9
9
9
51
34
28
270
280
285
C1 = 0.47
28
15
11
21
27
23
24
125
82
66
1263
1275
1280
MAX738A/MAX744A CIRCUIT CONDITIONS
V+ (V)
7
12
16
12
12
7
12
16
12
SOFT-START TIME (ms) vs. C1 (μF)
C1 = 0.047
4
2
1
3
5
27
16
13
112
R1 (k
)
510
510
510
510
510
None
None
None
None
I
OUT
(mA)
0
0
0
300
750
0
0
0
300
C4 (μF)
100
100
100
100
100
100
100
100
100
C1 = 0.01
1
1
1
1
1
12
7
6
27
C1 = 0.1
6
3
2
5
8
40
25
20
215
C1 = 0.47
18
8
6
3
21
100
54
68
1114
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX744A | 5V, Step-Down, Current-Mode PWM DC-DC Converters |
| MAX738AEWE | LJT 37C 37#22D SKT PLUG |
| MAX744AEWE | Circular Connector; No. of Contacts:26; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:17-26 RoHS Compliant: No |
| MAX738ACWE | Replaced by SN54197 : 50/30/100-Mhz Presettable Decade OR Binary Counters/Latches 14-CFP -55 to 125 |
| MAX738AEPA | Dual 4-Input Positive-NAND Gates 20-LCCC -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX738AC/D | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 DICE SALES DICE RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX738AC/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX738ACPA | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX738ACPA+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX738ACWE | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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