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参数资料
| 型号： | MAX757ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/9页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.3A 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.7 V ~ 5.5 V |
| 输入电压： | 0.7 V ~ 5.5 V |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 300mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
MAX756/MAX757
3.3V/5V/Adjustable-Output,
Step-Up DC-DC Converters
R3
C1
150 μ F
V IN
L1
22 μ H
The inductor’s DC resistance significantly affects effi-
ciency. For highest efficiency, limit L1’s DC resistance
to 0.03 Ω or less. See Table 1 for a list of suggested
inductor suppliers.
5
LBI
LX
8
D1
1N5817
V OUT
Table 1. Component Suppliers
R4
MAX757 OUT 6
R1
C2
100 μ F
PRODUCTION
METHOD
INDUCTORS
CAPACITORS
Surface-Mount
Sumida
AVX
1
SHDN
FB
2
CD54-220 (22μH)
TPS series
CoilCraft
C3
0.1 μ F
3
REF
GND
7
LBO
4
R2
DT3316-223
Coiltronics
CTX20-1
Sprague
595D series
Figure 1. Standard Application Circuit
Miniature
Through-Hole
Sumida
RCH654-220
Sanyo OS-CON
OS-CON series
low-ESR organic
semiconductor
where V IN is the desired threshold of the low-battery
detector, R3 and R4 are the input divider resistors at
LBI, and V REF is the internal 1.25V reference.
Since the LBI current is less than 100nA, large resistor
values (typically 10k Ω to 200k Ω ) can be used for R3
and R4 to minimize loading of the input supply.
Low-Cost
Through-Hole
CoilCraft
PCH-27-223
Nichicon
PL series
low-ESR
electrolyic
United Chemi-Con
LXF series
When the voltage at LBI is below the internal threshold,
LBO sinks current to GND. A pull-up resistor of 10k Ω
or more connected from LBO to V OUT can be used
when driving CMOS circuits. Any pull-up resistor con-
nected to LBO should not be returned to a voltage
source greater than V OUT . When LBI is above the
threshold, the LBO output is off. The low-battery com-
parator and reference voltage remain active when the
MAX756/MAX757 is in shutdown mode.
If the low-battery comparator is not used, connect LBI
AVX
CoilCraft
Coiltronics
Collmer
Semiconductor
Motorola
Nichicon
Nihon
USA: (207) 282-5111, FAX (207) 283-1941
(800) 282-9975
USA: (708) 639-6400, FAX (708) 639-1969
USA: (407) 241-7876, FAX (407) 241-9339
USA: (214) 233-1589
USA: (602) 244-3576, FAX (602) 244-4015
USA: (708) 843-7500, FAX (708) 843-2798
Japan: +81-7-5231-8461, FAX (+81-) 7-5256-4158
USA: (805) 867-2555, FAX (805) 867-2556
to V IN and leave LBO open.
Inductor Selection
The inductors should have a saturation (incremental)
current rating equal to or greater than the peak switch-
current limit, which is 1.2A worst-case. However, it’s
generally acceptable to bias the inductor into satura-
tion by 20%, although this will reduce the efficiency.
The 22μH inductor shown in the typical applications cir-
cuit is sufficient for most MAX756/MAX757 application
circuits. Higher input voltages increase the energy
transferred with each cycle, due to the reduced
input/output differential. Minimize excess ripple due to
increased energy transfer by reducing the inductor
value (10μH suggested).
6
Japan: +81-3-3494-7411, FAX (+81-) 3-3494-7414
Sanyo OS-CON USA: (619) 661-6835
Japan: +81-720-70-1005, FAX (+81-720-) 70-1174
Sprague USA: (603) 224-1961, FAX (603) 224-1430
Sumida USA: (708) 956-0666
Japan: +81-3-3607-5111, FAX (+81-3-) 3607-5428
United
Chemi-Con USA: (708) 696-2000, FAX (708) 640-6311
Capacitor Selection
A 100μF, 10V surface-mount (SMT) tantalum capacitor
typically provides 50mV output ripple when stepping
up from 2V to 5V at 200mA. Smaller capacitors, down
to 10μF, are acceptable for light loads or in applica-
tions that can tolerate higher output ripple.
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX758ACPA | 功能描述:直流/直流开关调节器 Adjustable PWM Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX758ACPA+ | 功能描述:直流/直流开关调节器 Adjustable PWM Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX758ACPA+ | 制造商:Maxim Integrated Products 功能描述:IC STEP-DOWN REGULATOR |
| MAX758ACWE | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX758ACWE+ | 功能描述:直流/直流开关调节器 Adjustable PWM Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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