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| 型号： | MAX5038EAI33+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/26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
Selecting higher switching frequencies reduces the
inductance requirement, but at the cost of lower efficien-
cy. The charge/discharge cycle of the gate and drain
Use the following equation to determine the worst-case
inductor current for each phase:
capacitances in the switching MOSFETs create switching
losses. The situation worsens at higher input voltages,
since switching losses are proportional to the square of
input voltage. Use 500kHz per phase for V IN = +5V and
I L _ PEAK =
0 . 051
R SENSE
+
? I L
2
(15)
250kHz or less per phase for V IN > +12V.
Although lower switching frequencies per phase increase
the peak-to-peak inductor ripple current ( ? I L ), the ripple
cancellation in the multiphase topology reduces the input
and output capacitor RMS ripple current.
Use the following equation to determine the minimum
inductance value:
where R SENSE is the sense resistor in each phase.
Switching MOSFETs
when choosing a MOSFET for voltage regulators,
consider the total gate charge, R DS(ON) , power dissipa-
tion, and package thermal impedance. The product of
the MOSFET gate charge and on-resistance is a figure of
merit, with a lower number signifying better performance.
L MIN =
( V INMAX ? V OUT ) × V OUT
V IN × f SW × ? I L
(13)
Choose MOSFETs optimized for high-frequency switch-
ing applications.
The average gate-drive current from the MAX5038/
MAX5041 output is proportional to the total capacitance
? V IN × I OUT × ( t R + t F ) × f SW ? 2
? ? + 1 . 4 R DS ( ON ) × I RMS ? HI
?
?
Choose ? I L equal to about 40% of the output current
per phase. Since ? I L affects the output-ripple voltage,
the inductance value may need minor adjustment after
choosing the output capacitors for full-rated efficiency.
Choose inductors from the standard high-current,
surface-mount inductor series available from various
manufacturers. Particular applications may require cus-
tom-made inductors. Use high-frequency core material
for custom inductors. High ? I L causes large peak-to-peak
flux excursion increasing the core losses at higher fre-
quencies. The high-frequency operation coupled with
high ? I L , reduces the required minimum inductance
and even makes the use of planar inductors possible.
The advantages of using planar magnetics include low-
profile design, excellent current-sharing between phas-
es due to the tight control of parasitics, and low cost.
For example, calculate the minimum inductance at
V IN(MAX) = +13.2V, V OUT = +1.8V, ? I L = 10A, and f SW =
250kHz:
it drives from DH1, DH2, DL1, and DL2. The power dis-
sipated in the MAX5038/MAX5041 is proportional to the
input voltage and the average drive current. See the V IN
and V CC section to determine the maximum total gate
charge allowed from all the driver outputs together.
The gate charge and drain capacitance (CV 2) loss, the
cross-conduction loss in the upper MOSFET due to finite
rise/fall time, and the I 2 R loss due to RMS current in the
MOSFET R DS(ON) account for the total losses in the MOS-
FET. Estimate the power loss (PD MOS _) in the high-side
and low-side MOSFETs using following equations:
PD MOS ? HI = ( Q G × V DD × f SW ) + (16)
4
where Q G , R DS(ON) , t R , and t F are the upper-switching
MOSFET’s total gate charge, on-resistance at +25°C,
rise time, and fall time, respectively.
( 13 . 2 ? 1 . 8 ) × 1 . 8 = 0 . 6 μ H
( I )
DC PK + I DC PK ×
+ I
× I
L MIN =
13 . 2 × 250 k × 10
(14)
I RMS ? HI =
2 2
D
3
(17)
The average current-mode control feature of the
MAX5038/MAX5041 limits the maximum peak inductor
current which prevents the inductor from saturating.
Choose an inductor with a saturating current greater
than the worst-case peak inductor current.
where D = V OUT /V IN , I DC = (I OUT - ? I L )/2 and I PK =
(I OUT + ? I L )/2
22
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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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