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参数资料
| 型号： | MAX1951ESA+TW |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
1MHz, All-Ceramic, 2.6V to 5.5V Input,
2A PWM Step-Down DC-to-DC Regulators
gmc = 4.2S
f SWITCH = 1MHz
R LOAD = V OUT /I OUT(MAX) = 1.5V/1.5 A = 1 Ω
fp MOD = [1/(2 π x C OUT x (R LOAD + R ESR )]
= [1/(2 x π × 10 × 10 -6 x (1 + 0.01)] = 15.76kHz.
fz ESR = [1/(2 π xC OUT R ESR )]
= [1/(2 x π × 10 × 10 -6 × 0.01)] = 1.59MHz.
For 2μH output inductor, pick the closed-loop unity-gain
crossover frequency (f C ) at 200kHz. Determine the
power modulator gain at f C :
G MOD(fc ) = gmc × R LOAD × fp MOD /f C = 4.2 × 1 ×
3) Keep the high-current paths as short and wide as
possible. Keep the path of switching current (C1 to IN
and C1 to PGND) short. Avoid vias in the switching
paths.
4) If possible, connect IN, LX, and PGND separately to
a large copper area to help cool the IC to further
improve efficiency and long-term reliability.
5) Ensure all feedback connections are short and
direct. Place the feedback resistors as close to the
IC as possible.
6) Route high-speed switching nodes away from sensi-
tive analog areas (FB, COMP).
then:
15.76kHz/200kHz = 0.33
Thermal Considerations
The MAX1951 uses a fused-lead 8-pin SO package with
R 1 = V O x K/(gm EA x V FB x G MOD(fc ) ) = (1.5 x 0.55)/
(60 × 10 -6 × 0.8 × 0.33) ≈ 51.1k Ω (1%)
C 2 = (V OUT × C OUT )/(R × I OUT(max) )
= (1.5 × 10 × 10 -6 )/(51.1k × 1.5)
≈ 196pF, choose 220pF, 10%
Applications Information
PCB Layout Considerations
Careful PCB layout is critical to achieve clean and sta-
ble operation. The switching power stage requires par-
ticular attention. Follow these guidelines for good PCB
layout:
1) Place decoupling capacitors as close to the IC as
possible. Keep power ground plane (connected to
PGND) and signal ground plane (connected to
GND) separate.
2) Connect input and output capacitors to the power
ground plane; connect all other capacitors to the
signal ground plane.
a R THJC rating of 32°C/W. The MAX1951 EV kit layout is
optimized for 1.5A. The typical application circuit shown
in Figure 2c was tested with the existing MAX1951 EV kit
layout at +85°C ambient temperature, and GND lead
temperature was measured at +113°C for a typical
device. The estimated junction temperature was
+138°C. Thermal performance can be further improved
with one of the following options:
1) Increase the copper areas connected to GND, LX,
and IN.
2) Provide thermal vias next to GND and IN, to the
ground plane and power plane on the back side of
PCB, with openings in the solder mask next to the
vias to provide better thermal conduction.
3) Provide forced-air cooling to further reduce case
temperature.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1951EVKIT | 功能描述:直流/直流开关调节器 Evaluation Kit for the MAX1951 MAX1952 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX19526EVKIT+ | 制造商:Maxim Integrated Products 功能描述:ANALOG TO DIGITAL CONVERTER - Boxed Product (Development Kits) |
| MAX19526EXE+ | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) Analog to Digital Converters - IC ADC 12BIT 8CH 40MSPS 144CTBGA 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 |
| MAX19526EXE+T | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) Analog to Digital Converters - IC ADC 12BIT 8CH 40MSPS 144CTBGA 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 |
| MAX19527EVKIT+ | 功能描述:数据转换 IC 开发工具 MAX19527 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
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