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| 型号： | MAX1709EVKIT |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | MAX1709 Evaluation Kit |
| 中文描述： | MAX1709评估板 |
| 文件页数： | 10/12页 |
| 文件大小： | 502K |
| 代理商： | MAX1709EVKIT |
M
4A, Low-Noise, High-Frequency,
Step-Up DC-DC Converter
10
______________________________________________________________________________________
where I
1
is the desired current limit in amperes, and
I
LIM
is the current limit value from the
Electrical
Characteristics
.
__________________Design Procedure
Inductor Selection (L1)
The MAX1709
’
s high switching frequency allows the
use of a small-size inductor. Use a 1.0μH inductor for
600kHz operation. If the MAX1709 will be synchronized
at a different frequency, scale the inductor value with
the inverse of frequency (L
1
= 1μH
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 1.5μH for 350kHz and
0.68μH 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 MAX1709
’
s full
load current is needed (see
Electrical Characteristics
for ratings). For highest efficiency, use a coil with low
DC resistance, preferably under 10m
. 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
current
V
OUT
= output voltage
D' = (V
IN
) / (V
OUT
+ V
D
), assuming switch voltage drop
is negligible
f = switching frequency
L1 = inductor value
I
D I
'
D
V
V
V
L
OUT MAX
(
LIM
OUT
D
IN
)
'
=
+
× ×
1
2
SUPPLIER
Coilcraft
Coiltronics
Motorola
Panasonic
STM-
Microelectronics
PHONE
847-639-6400
561-241-7876
602-303-5454
714-373-7939
FAX
847-639-1489
561-241-9339
602-994-6430
714-373-7183
617-259-0300
617-259-9442
Table 4. Component Suppliers
Table 3. Component Selection Guide
PRODUCTION
INDUCTORS
CAPACITORS
DIODES
Coilcraft DO3316P-102HC
Panasonic EEFUE0J151R
Motorola MBRD1035CTL
STM-Microelectronics
STPS8L30B
Surface mount
Coiltronics UP2B-1R0
Sanyo 6TPC100M
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
MAX1709
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PDF描述 |
|---|---|
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX170ACPA | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX170ACPA+ | 功能描述:模数转换器 - ADC 12-Bit 115ksps 5.25V- Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX170ACWE | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX170ACWE+ | 功能描述:模数转换器 - ADC Serial Output 5.6 Micro Seconds 12-Bit ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX170ACWE+T | 功能描述:模数转换器 - ADC Serial Output 5.6 Micro Seconds 12-Bit ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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