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参数资料
| 型号： | MAX5038EAI33+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 46 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 90% |
| 电源电压： | 4.75 V ~ 28 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 ~ 85°C |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
Dual-Phase, Parallelable, Average Current-Mode
Controllers
Differential Amplifier
The differential amplifier (DIFF AMP) facilitates output
voltage remote sensing at the load (Figures 3a and 3b).
Use the following equations to calculate the value of R X .
For MAX5038 versions of V OUT(NOM) ≤ +1.8V:
It provides true differential output voltage sensing while
rejecting the common-mode voltage errors due to high-
current ground paths. Sensing the output voltage
R X = [ V CC ? ( V NOM + 0 . 6 )] ×
R F
V NOM
(5)
directly at the load provides accurate load voltage
For MAX5038 versions of V OUT(NOM) > +1.8V:
sensing in high-current environments. The VEA pro-
vides the difference between the differential amplifier
output (DIFF) and the desired output voltage. The dif-
ferential amplifier has a bandwidth of 3MHz. The differ-
R X = [ 2 V CC ? ( V NOM + 1 . 2 )] ×
For MAX5041:
R F
V NOM
(6)
ence between SENSE+ and SENSE- regulates to the
preset output voltage for the MAX5038 and regulates to
+1V for the MAX5041.
R X = [ V CC ? 1 . 6 ] ×
R F
V REF
(7)
Voltage-Error Amplifier
The VEA sets the gain of the voltage control loop and
determines the error between the differential amplifier
output and the internal reference voltage (V REF ).
V REF equals V OUT(NOM) for the +1.8V or lower voltage
versions of the MAX5038 and V REF equals V OUT(NOM) /2
for the +2.5V and +3.3V versions. For MAX5041, V REF
equals +1V.
An offset is added to the output voltage of the
MAX5038/MAX5041 with a finite gain (R F /R IN ) of the
VEA such that the no-load output voltage is higher than
the nominal value. Choose R F and R IN from the
Adaptive Voltage Positioning section and use the follow-
ing equations to calculate the no-load output voltage.
MAX5038:
The VEA output clamps to +0.9V (plus the common-
mode voltage of +0.6V), thus limiting the average maxi-
mum current from individual phases. The maximum
average current-limit threshold for each phase is equal
to the maximum clamp voltage of the VEA divided by
the gain (18) of the current-sense amplifier. This allows
for accurate settings for the average maximum current
for each phase. Set the VEA gain using R F and R IN for
the amount of output voltage positioning required as
discussed in the Adaptive Voltage Positioning section
(Figures 3a and 3b).
Adaptive Voltage Positioning
Powering new-generation processors requires new
techniques to reduce cost, size, and power dissipation.
Voltage positioning reduces the total number of output
capacitors to meet a given transient response require-
V OUT ( NL ) = ? 1 + IN ? × ? H L ? × V REF
MAX5041:
? R ?
V OUT ( NL ) = ? 1 + IN ? × V OUT ( NOM )
? R F ?
? R ? ? R + R ?
? R F ? ? R L ?
(3)
(4)
ment. Setting the no-load output voltage slightly higher
than the output voltage during nominally loaded condi-
tions allows a larger downward voltage excursion when
the output current suddenly increases. Regulating at a
lower output voltage under a heavy load allows a larger
upward-voltage excursion when the output current sud-
denly decreases. A larger allowed, voltage-step excur-
sion reduces the required number of output capacitors
or allows for the use of higher ESR capacitors.
where R H and R L are the feedback resistor network
(Figure 2).
Some applications require V OUT equal to V OUT(NOM) at
no load. To ensure that the output voltage does not
exceed the nominal output voltage (V OUT(NOM) ), add a
resistor R X from V CC to EAN.
Voltage positioning and the ability to operate with multiple
reference voltages may require the output to regulate
away from a center value. Define the center value as the
voltage where the output drops ( ? V OUT /2) at one half the
maximum output current (Figure 5).
16
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相关代理商/技术参数 |
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| MAX5038EAI33+ | 功能描述:电流型 PWM 控制器 Dual-Phase Parallelable Average RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5038EAI33+T | 功能描述:电流型 PWM 控制器 Dual-Phase Parallelable Average RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5038EAI33-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5039 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Voltage-Tracking Controllers for PowerPC.DSPs.and ASICs |
| MAX5039EUA | 功能描述:其他电源管理 V-Track Ctlr for PowerPC DSPs & ASICs RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
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