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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： | 9/13页 |
| 文件大小： | 332K |
| 代理商： | MAX1708EEE |
M
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
_______________________________________________________________________________________
9
_______________Detailed Description
The MAX1708 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 MAX1708 internal N-channel MOSFET switch is
rated for 5A (RMS value) and can deliver loads to 2A,
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 1MHz.
ONA,
ONB
The logic levels at ONA and
ONB
turn the MAX1708 on
or off. When ONA = 1 or
ONB
= 0, the device is on.
When ONA = 0 and
ONB
= 1, the device is off (Table
1). Logic high on-control can be implemented by con-
necting
ONB
high and using ONA for shutdown.
Implement inverted single-line on/off control by ground-
ing 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 MAX1708 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 MAX1708 will synchronize to a
new external clock rate in two cycles and will take
approximately 40μs to revert to its internal clock fre-
quency once the external clock pulses stop and CLK is
driven high. Table 2 summarizes oscillator operation.
Operation
The MAX1708 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
MAX1708. Figure 3 shows the simplified PWM con-
Figure 1. Standard Operating Circuit
KEEP TRACES
SHORT AND WIDE
ON/OFF
CONTROL
MAX1708
L1
2.2
μ
H
C1
150
μ
F
V
IN
GND
R1
C3
C4
0.22
μ
F
GND
REF
SS/LIM
PGND PGND PGND
C5
0.1
μ
F
FB
GND
OUT
3.3/5
CLK
D1
LX
LX
LX
R2
2
C2
150
μ
F
V
OUT
+5V
GND
ONA
ONB
KEEP TRACES
SHORT AND WIDE
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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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