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参数资料
| 型号： | MAX16955AUE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16TSSOP |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 3.5 V ~ 36 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
MAX16955
36V, 1MHz Step-Down Controller
with Low Operating Current
Input Capacitor
The input filter capacitor reduces peak currents drawn
from the power source and reduces noise and voltage
ripple on the input caused by the circuit’s switching.
The input capacitor RMS current requirement (I RMS ) is
defined by the following equation:
absorb the inductor energy while transitioning from full-
load to no-load conditions without tripping the overvolt-
age fault protection. When using high-capacitance,
low-ESR capacitors, the filter capacitor’s ESR dominates
the output-voltage ripple. The size of the output capaci-
tor depends on the maximum ESR required to meet the
output-voltage ripple (V RIPPLE(P-P) ) specifications:
I RMS = I LOAD ( MAX )
V OUT ( V SUP ? V OUT )
V SUP
V RIPPLE ( P ? P ) = ESR × I LOAD ( MAX ) × LIR
V RIPPLE ( P ? P ) = SKIP
I RMS has a maximum value when the input voltage
equals twice the output voltage (V SUP = 2V OUT ), so
I RMS(MAX) = I LOAD(MAX) /2.
Choose an input capacitor that exhibits less than +10°C
self-heating temperature rise at the RMS input current
for optimal long-term reliability.
The input-voltage ripple comprises Δ V Q (caused by the
capacitor discharge) and Δ V ESR (caused by the ESR of
the capacitor). Use low-ESR ceramic capacitors with
high-ripple-current capability at the input. Assume the
contribution from the ESR and capacitor discharge is
equal to 50%. Calculate the input capacitance and ESR
required for a specified input voltage ripple using the
following equations:
In skip mode, the inductor current becomes discontinu-
ous, with the peak current set by the skip-mode cur-
rent-sense threshold (V SKIP = 32mV, typ). In skip mode,
the no-load output ripple can be determined as follows:
V × ESR
R SENSE
The actual capacitance value required relates to the
physical size needed to achieve low ESR, as well as to
the chemistry of the capacitor technology. Thus, the
capacitor is usually selected by ESR and voltage rating
rather than by capacitance value.
I OUT +
where:
ESR IN =
Δ V ESR
Δ I L
2
When using low-value filter capacitors, such as ceramic
capacitors, size is usually determined by the capacity
needed to prevent V SAG and V SOAR from causing
problems during load transients. Generally, once
enough capacitance is added to meet the overshoot
requirement, undershoot at the rising load edge is no
Δ I L =
( V SUP ? V OUT ) × V OUT
V SUP × f SW × L
longer a problem (see the V SAG and V SOAR equations
in the Transient Response section). However, low-value
filter capacitors typically have high-ESR zeros that can
affect the overall stability.
I × D ( 1 ? D )
C IN = OUT
D = OUT
and:
Δ V Q × f SW
where:
V
V SUP
Output Capacitor
The output filter capacitor must have low enough ESR
to meet output ripple and load-transient requirements,
yet have high enough ESR to satisfy stability require-
ments. The output capacitance must be high enough to
Maxim Integrated
Compensation Design
The MAX16955 uses an internal transconductance error
amplifier with its inverting input and its output available
to the user for external frequency compensation. The
output capacitor and compensation network determine
the loop stability. The inductor and the output capacitor
are chosen based on performance, size, and cost.
Additionally, the compensation network optimizes the
control-loop stability.
The controller uses a current-mode control scheme that
regulates the output voltage by forcing the required
current through the external inductor. The MAX16955
uses the voltage drop across the DC resistance of the
inductor or the alternate series current-sense resistor to
measure the inductor current. Current-mode control
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16955EVKIT# | 功能描述:电源管理IC开发工具 MAX16955 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX16955EVKIT+ | 功能描述:电源管理IC开发工具 MAX16955 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX16956AUBA/V+T | 制造商:Maxim Integrated Products 功能描述:36V, 300MA, MINI BUCK CONVERTER WITH 2UA IQ - Tape and Reel |
| MAX16958GEE/V+ | 功能描述:模数转换器 - ADC 500mA Hi-Speed USB Protector 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 |
| MAX16958GEE/V+T | 功能描述:模数转换器 - ADC 500mA Hi-Speed USB Protector 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 |
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