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參數(shù)資料
| 型號(hào)： | MAX1763 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter |
| 中文描述： | 1.5A、低噪聲、1MHz、升壓型DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 456K |
| 代理商： | MAX1763 |
resistance of the package from +115
°
C/W for QSOP to
+53
°
C/W for the TSSOP-EP.
At an ambient temperature of +70
°
C, continuous power
dissipation for the QSSOP package is 667mW, while
the TSSOP-EP can dissipate 1.5W. A first-order esti-
mate of power dissipation can be determined by calcu-
lating the output power delivered to the load (e.g., 3.3V
1A = 3.3W). At the input voltage used, find the effi-
ciency from the
Typical Operating Characteristics
graphs (e.g., 87%). The estimated power dissipation in
the MAX1763 is then: (100% - %Efficiency)
Output
Power. The example would have: 13%
3.3W = 0.43W,
allowing the QSOP package (667mW) to be used. For
higher ambient temperature, higher output power, or a
lower-efficiency operating point, the TSSOP-EP pack-
age (1.5W) may be necessary. For detailed package
mechanical information, see the package outline draw-
ings at the end of this data sheet.
Inductor Selection
The MAX1763
’
s high switching frequency allows the
use of a small 1.5μH surface-mount inductor. The cho-
sen inductor should generally have a saturation current
rating exceeding the N-channel switch current limit;
however, it is acceptable to bias the inductor current
into saturation by as much as 20% if a slight reduction
in efficiency is acceptable. Inductors rated for lower
peak current may be used if ISET is employed to
reduce the peak inductor current (see
Setting the
Switch Current Limit and Soft-Start
). For high efficiency,
choose an inductor with a high-frequency ferrite core
material to reduce core losses. To minimize radiated
noise, use a toroid or shielded inductor. See Table 4 for
suggested components and Table 5 for a list of compo-
nent suppliers. Connect the inductor from the battery to
the LX pins as close to the IC as possible.
External Diode
For output voltages greater than 4V, an external
Schottky diode must be connected from LX to POUT, in
parallel with the on-chip synchronous rectifier (Figure
2). The diode should be rated for 0.5A. Representative
devices are Motorola MBR0520L, Nihon EP05Q03L, or
generic 1N5817. This external diode is also recom-
mended for applications that must start with input volt-
ages at or below 1.8V. The Schottky diode carries
current during both startup and after the synchronous
rectifier turns off. Thus, its current rating only needs to
be 500mA even if the inductor current is higher.
Connect the diode as close to the IC as possible. Do
not use ordinary rectifier diodes; their slow switching
speeds and long reverse-recovery times render them
unacceptable. For circuits that do not require startup
with inputs below 1.8V, and have an output of 4V or
less, no external diode is needed.
Input and Output Capacitors
Choose input and output capacitors that will service the
input and output peak currents with acceptable voltage
ripple. Choose input capacitors with working voltage
ratings over the maximum input voltage, and output
capacitors with working voltage ratings higher than the
output. A 220μF, low equivalent-series-resistance (ESR)
(less than 100m
) capacitor is recommended for most
applications. Alternatively, two 100μF capacitors in par-
allel will reduce the effective ESR for even better perfor-
mance.
The input capacitor reduces peak currents drawn from
the input source and also reduces input switching noise.
The input voltage source impedance determines the
required size of the input capacitor. When operating
directly from one or two NiMH cells placed close to the
MAX1763, use a single 47μF low-ESR input filter capaci-
tor. With higher impedance batteries, such as alkaline
and Li+, a higher value input capacitor may improve effi-
ciency.
Sanyo POSCAP, Panasonic SP/CB, and Kemet T510
are good low-ESR capacitors (Tables 4 and 5). Low-
ESR tantalum capacitors offer a good trade-off between
price and performance. Do not exceed the ripple cur-
rent ratings of tantalum capacitors. Avoid aluminum
M
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
______________________________________________________________________________________
13
Table 5. Component Suppliers
SUPPLIER
PHONE
AVX
Coilcraft
Kemet
USA: 843-448-9411
USA: 847-639-6400
USA: 810-287-2536
Motorola
USA: 408-629-4789
Japan: 81-45-474-7030
Sumida
USA: 847-956-0666
Japan: 011-81-3-3667-3302
Note:
Please indicate that you are using the MAX1763 when
contacting these component suppliers.
Table 4. Component Selection Guide
INDUCTORS
CAPACITORS
AVX TPS series
Kemet T510 series
Sanyo POSCAP series
Panasonic SP/CB
DIODES
Coilcraft LPT3305
Motorola
MBR0520L
Sumida
Nihon
EP10QY03
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1763EEE | 1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter |
| MAX1763EUE | Replaced by TMS320C6410 : Digital Signal Processors 68-PLCC -40 to 85 |
| MAX1765 | Replaced by TMS320C6410 : Digital Signal Processors 68-PLCC -40 to 85 |
| MAX1765EEE | 800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator |
| MAX1765EUE | 800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1763EEE | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5A Low-Noise 1MHz Step-Up 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 |
| MAX1763EEE+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5A Low-Noise 1MHz Step-Up 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 |
| MAX1763EEE+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5A Low-Noise 1MHz Step-Up 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 |
| MAX1763EEE-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5A Low-Noise 1MHz Step-Up 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 |
| MAX1763EUE | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5A Low-Noise 1MHz Step-Up 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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