- 您现在的位置：买卖IC网 > PDF目录383332 > MAX1709EVKIT (Maxim Integrated Products, Inc.) MAX1709 Evaluation Kit PDF资料下载
参数资料
| 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： | 8/12页 |
| 文件大小： | 502K |
| 代理商： | MAX1709EVKIT |
M
4A, Low-Noise, High-Frequency,
Step-Up DC-DC Converter
8
_______________________________________________________________________________________
_______________Detailed Description
The MAX1709 step-up converter offers high efficiency
and high integration for high-power applications. It
operates with an input voltage as low as 0.7V and is
suitable for single- to 3 cell battery inputs as well as
2.5V or 3.3V regulated supply inputs. The output volt-
age is preset to +3.3V or +5.0V or can be adjusted with
external resistors for voltages between +2.5V to +5.5V.
The MAX1709 internal N-channel MOSFET switch is
rated for 10A (RMS value) and can deliver loads to 4A,
depending on input and output voltages. For flexibility,
the current limit and soft-start rate are independently
programmable.
A 600kHz switching frequency allows for a small induc-
tor to be used. The switching frequency is also syn-
chronizable to an external clock ranging from 350kHz
to 1000kHz.
ONA,
ONB
The logic levels at ONA and
ONB
turn the MAX1709 on
or off. When ONA = 1 or
ONB
= 0, the part is on. When
ONA = 0 and
ONB
= 1, the part is off (Table 1). Logic
high on control can be implemented by tying
ONB
high
and using ONA for shutdown. Implement inverted sin-
gle-line on/off control by grounding ONA and toggling
ONB
. Implement momentary pushbutton On/Off as
described in the
Applications Information
section. Both
inputs have approximately 0.15V of hysteresis.
Switching Frequency
The MAX1709 switches at the fixed-frequency internal
oscillator rate (600kHz) or can be synchronized to an
external clock. Connect CLK to OUT for internal clock
operation. Apply a clock signal to CLK to synchronize
to an external clock. The frequency can be changed on
the fly. The MAX1709 will synchronize to a new external
clock rate in two cycles and will take approximately
40μs to revert to its internal clock frequency once the
external clock pulses stop and CLK is driven high.
Table 2 summarizes oscillator operation.
Operation
The MAX1709 switches at a constant frequency
(600kHz) and modulates the MOSFET switch pulse
width to control the power transferred per cycle and
regulate the voltage across the load. In low-noise appli-
cations, the fundamental and the harmonics generated
by the fixed switching frequency are easily filtered out.
Figure 2 shows the simplified functional diagram for the
MAX1709. Figure 3 shows the simplified PWM con-
Figure 1. Standard Operating Circuit
R2
2
GND
D1
L1
ONA
LX
LX
LX
GND
SS/LIM
REF
GND
ONB
CLK
3.3/5
PGND
PGND
PGND
FB
OUT
KEEP TRACES
SHORT AND WIDE
R1
C3
C4
0.22
μ
F
C5
0.1
μ
F
C6, C7
2 x
150
μ
F
1
μ
H
V
OUT
5V
V
IN
1V TO 5V
ON-OFF
CONTROL
MAX1709
C1, C2
2 x 150
μ
F
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1709ESE | 4A, Low-Noise, High-Frequency, Step-Up DC-DC Converter |
| MAX170CCPA | Serial Output 5.6us 12-Bit A/D Converter |
| MAX170CCWE | Serial Output 5.6us 12-Bit A/D Converter |
| MAX170 | 16-Bit Registered Transceivers With 3-State Outputs 56-SSOP -40 to 85 |
| MAX170DCWE | B Series/ Female Crimp |
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 |
发布紧急采购，3分钟左右您将得到回复。