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参数资料
| 型号： | MAX1708EEE |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | CHOKE COIL 2.2UH 1000MA SMD |
| 中文描述： | 7.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, 0.025 INCH PITCH, QSOP-16 |
| 文件页数： | 11/13页 |
| 文件大小： | 332K |
| 代理商： | MAX1708EEE |
M
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
______________________________________________________________________________________
11
__________________Design Procedure
Inductor Selection (L1)
The MAX1708
’
s high switching frequency allows the
use of a small-size inductor. Use a 2.2μH inductor for
600kHz operation. If the MAX1708 is synchronized at a
different frequency, scale the inductor value with the
inverse of frequency (L
1
= 2.2μH
600kHz / f
SYNC
).
The PWM design tolerates inductor values within ±25%
of this calculated value, so choose the closest standard
inductor value. For example, use 3.3μH for 350kHz and
1.5μH for 1MHz).
Inductors with a ferrite core or equivalent are recom-
mended; powder iron cores are not recommended for
use at high switching frequencies. Ensure the induc-
tor
’
s saturation rating (the current at which the core
begins to saturate and inductance falls) exceeds the
internal current limit. Note that this current may be
reduced through SS/LIM if less than the MAX1708
’
s full
load current is needed (see
Electrical Characteristics
for ratings). For highest efficiency, use a coil with low
DC resistance, preferably under 20m
. To minimize
radiated noise, use a toroid, pot core, or shielded
inductor. See Tables 3 and 4 for a list of recommended
components and component suppliers. To calculate
the maximum output current (in amperes), use the fol-
lowing equation:
where:
V
IN
= input voltage
V
D
= forward voltage drop of the Schottky diode
at I
LIM
V
OUT
= output voltage
D' = (V
IN
) / (V
OUT
+ V
D
), neglecting switch voltage
drop
f = switching frequency
L1 = inductor value
I
LIM
= minimum value of switch current limit from
Electrical Characteristics
or set by R1 of
Figure 1.
I
D I
'
D
V
V
V
L
OUT MAX
(
LIM
OUT
D
IN
)
'
=
+
× ×
1
2
SUPPLIER
Central
Coilcraft
Coiltronics
Motorola
Panasonic
PHONE
631-435-1110
847-639-6400
561-241-7876
602-303-5454
714-373-7939
FAX
631-435-1824
847-639-1489
561-241-9339
602-994-6430
714-373-7183
Table 4. Component Suppliers
Table 3. Component Selection Guide
PRODUCTION
INDUCTORS
CAPACITORS
DIODES
Coiltronics UP2B-2R2
Coilcraft DO3316P-222HC
Sanyo 6TPC100M
Panasonic EEFUE0J151R
Motorola MBRD1035CTL
Central CMSH5-20
Surface mount
Figure 3. Simplified PWM Controller Functional Diagram
N
R
S
Q
LX
PGND
11m
REF
SLOPE
COMP
FB
SS/LIM
12.5
OSCILLATOR
(LIMITED TO 100mV)
Figure 4. Adjustable Output Voltage
R4
R3
KEEP SHORT
FB
V
IN
V
OUT
LX
MAX1708
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1708EEE+ | 功能描述:直流/直流开关转换器 High f Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1708EEE+T | 功能描述:直流/直流开关转换器 High f Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1708EEE-T | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1708EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1708 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1708EVKIT+ | 功能描述:直流/直流开关转换器 High-Frequency High-Power Low-Noise Step-Up DC-DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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