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参数资料
| 型号： | MAX1709ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BST 3.3V/5V/ADJ 4A 16SOIC |
| 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： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，5V，可调 |
| 输入电压： | 0.7 V ~ 5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 350kHz ~ 1MHz |
| 电流 - 输出： | 4A |
| 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SOIC |
4A, Low-Noise, High-Frequency,
Step-Up DC-DC Converter
Table 1. On/Off Logic Control
Table 2. Selecting Switching Frequency
ONA
0
0
1
1
ONB
0
1
0
1
MAX1709
On
Off
On
On
CLK
0
1
External clock
(350kHz ? 1000kHz)
MODE
Not allowed
PWM
Synchronized PWM
OUT
IC POWER
UNDERVOLTAGE LOCKOUT
MAX1709
PWM
2.15V
EN
STARTUP
OSCILLATOR
Q
D
CONTROLLER
SEE
FIGURE 3.
ONA
ONB
REF
CLK
1.260V
ON RDY
REFERENCE
EN
600kHz
OSCILLATOR
EN
OSC
N
LX
FB
3.3/5
GND
DUAL MODE
FB
OUT
FB
PGND
Figure 2. Simplified Functional Diagram
R 4 = R 3 ?? O U T ? 1 ??
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-
troller functional diagram. The MAX1709 enters syn-
chronized current-mode PWM when a clock signal
(350kHz < f CLK < 1000kHz) is applied to CLK. For
wireless or noise-sensitive applications, this ensures
that switching harmonics are predictable and kept out-
side the IF frequency band(s). High-frequency opera-
tion permits low-magnitude output ripple voltage and
minimum inductor and filter capacitor size. Switching
losses will increase at the higher frequencies (see
Power Dissipation).
Setting the Output Voltage
The MAX1709 features Dual-Mode? operation. When
FB is connected to ground, the MAX1709 generates a
fixed output voltage of either +3.3V or +5V, depending
Dual Mode is a trademark of Maxim Integrated Products, Inc.
on the logic applied to the 3.3 /5 input (Figure 1). The
output can be configured for other voltages, using two
external resistors as shown in Figure 4. To set the out-
put voltage externally, choose an R3 value that is large
enough to minimize load at the output but small enough
to minimize errors due to leakage and the time constant
to FB. A value of R3 ≤ 50k Ω is required.
? V ?
? V FB ?
where V FB = 1.24V.
Soft-Start/Current-Limit Adjustment
(SS/LIM)
The soft-start pin allows the soft-start time to be adjust-
ed by connecting a capacitor from SS/LIM to ground.
Select capacitor C3 (connected to SS/LIM pin) as:
C3 (in μF) = 3.2 t SS
where t SS is the time (in seconds) it takes the switch
current limit to reach full value.
To improve efficiency or reduce inductor size at
reduced load currents, the current limit can be reduced
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1709EUI | 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 |
| MAX1709EUI/GG8 | 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 |
| MAX1709EUI+ | 功能描述:直流/直流开关转换器 4A 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 |
| MAX1709EUI+T | 功能描述:直流/直流开关转换器 4A 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 |
| MAX1709EUI-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 |
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