- 您现在的位置：买卖IC网 > PDF目录13527 > MAX1709ESE+T (Maxim Integrated Products)IC REG BST 3.3V/5V/ADJ 4A 16SOIC PDF资料下载
参数资料
| 型号： | MAX1709ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/15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
Approximate equations for the MAX1709 internal loss
terms are as follows. Values in {} are example values for
a 3.3V input, 4V output, 4A design:
pulled low and the regulator turns on. The switch
should be on long enough for the microcontroller to exit
reset. The controller issues a logic high to ONA, which
P D(MAX1709) = P SW + P TRAN + P CAP
where:
P SW = (1 - D’) x I SW 2 x R SW
P TRAN = (V OUT + V D ) x I SW x
t SW x f / 3
P CAP = (C DIO + C DSW + C GSW ) x
(V OUT + V D ) 2 f
where:
D’ = duty factor of the n-channel switch =
V IN / (V OUT + V D )
(Note: D’ = 1 means the switch is always off)
{1.35W}
{1.08W}
{0.18W}
{0.09W}
{0.6}
guarantees that the part will stay on regardless of the
subsequent switch state. To turn the regulator off, press
the switch long enough for the controller to read the
switch status and pull ONA low. When the switch is
released, ONB pulls high and the regulator turns off.
Layout Considerations
The MAX1709ESE and MAX1709EUI+ both utilize PC
board area for heatsinking. Package dissipation ratings
in the Absolute Maximum Ratings section assume 1in 2
of 1oz copper.
The MAX1709EUI+ has superior power-dissipating ability
due to an exposed metal pad on the underside of the
package. The thermal resistance from the die to the
I SW , the approximate peak switch current =
I OUT / (D’ x eff), {8.23A}
(with eff. estimated at 81%)
R SW = Internal n-channel switch
resistance {0.04W)
(estimate for elevated die temperature)
exposed pad is a very low 1.2°C/W. The MAX1709ESE’s
ability to dissipate power will especially depend on the
PC board design. Typical thermal resistance for 1in 2 of
copper is 34°C/W. For tighter layouts, 0.5in 2 typically
exhibits 40°C/W. Adding multiple vias under the
MAX1709EUI+ to conduct heat to the bottom of the board
will also help dissipate power.
V D = forward voltage of the external
rectifier
t SW = the transition time of the
n-channel switch
f = the switching rate of the MAX1709
C DIO = rectifier capacitance
C DSW = internal n-channel drain
capacitance
C GSW = internal n-channel gate
capacitance
{0.5V}
{20ns}
{600kHz}
{1nF}
{2.5nF}
{1.5nF}
Due to high inductor current levels and fast switching
waveforms, proper PC board layout is essential. Protect
sensitive analog grounds by using a star ground con-
figuration. Connect PGND, the input bypass capacitor
ground lead, and the output filter capacitor ground lead
to a single point (star ground configuration). In addition,
minimize trace lengths to reduce stray capacitance and
trace resistance, especially from the LX pins to the
catch diode (D1) and output capacitors (C6 and C7) to
PGND pins. If an external resistor-divider is used to set
the output voltage (Figure 4), the trace from FB to the
resistors must be extremely short and must be shielded
Applications Information
Using a Momentary On/Off Switch
A momentary pushbutton switch can be used to turn
the MAX1709 on and off. As shown in Figure 5, when
ONA is pulled low and ONB is pulled high, the part is
off. When the momentary switch is pressed, ONB is
from switching signals, such as CLK or LX. Refer to a
layout example in the MAX1709EVKIT data sheet.
Chip Information
TRANSISTOR COUNT: 1112
12
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX759EWE+T | IC REG INV ADJ 0.3A 16SOIC |
| MAX736EWE+T | IC REG INV -12V 125MA 16SOIC |
| RBC15DRAH-S734 | CONN EDGECARD 30POS .100 R/A PCB |
| HMC06DRYN-S734 | CONN EDGECARD 12POS DIP .100 SLD |
| MAX739EWE+T | IC REG INV -5V 0.3A 16SOIC |
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 |
发布紧急采购，3分钟左右您将得到回复。